1934 lines
66 KiB
C
1934 lines
66 KiB
C
/*
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* AVI demuxer
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* Copyright (c) 2001 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <inttypes.h>
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#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
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#include "libavutil/bswap.h"
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#include "libavutil/opt.h"
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#include "libavutil/dict.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mathematics.h"
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#include "avformat.h"
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#include "avi.h"
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#include "dv.h"
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#include "internal.h"
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#include "isom.h"
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#include "riff.h"
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#include "libavcodec/bytestream.h"
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#include "libavcodec/exif.h"
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#include "libavcodec/internal.h"
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typedef struct AVIStream {
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int64_t frame_offset; /* current frame (video) or byte (audio) counter
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* (used to compute the pts) */
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int remaining;
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int packet_size;
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uint32_t handler;
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uint32_t scale;
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uint32_t rate;
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int sample_size; /* size of one sample (or packet)
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* (in the rate/scale sense) in bytes */
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int64_t cum_len; /* temporary storage (used during seek) */
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int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
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int prefix_count;
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uint32_t pal[256];
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int has_pal;
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int dshow_block_align; /* block align variable used to emulate bugs in
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* the MS dshow demuxer */
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AVFormatContext *sub_ctx;
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AVPacket sub_pkt;
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uint8_t *sub_buffer;
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int64_t seek_pos;
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} AVIStream;
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typedef struct AVIContext {
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const AVClass *class;
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int64_t riff_end;
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int64_t movi_end;
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int64_t fsize;
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int64_t io_fsize;
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int64_t movi_list;
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int64_t last_pkt_pos;
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int index_loaded;
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int is_odml;
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int non_interleaved;
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int stream_index;
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DVDemuxContext *dv_demux;
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int odml_depth;
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int use_odml;
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#define MAX_ODML_DEPTH 1000
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int64_t dts_max;
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} AVIContext;
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static const AVOption options[] = {
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{ "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
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{ NULL },
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};
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static const AVClass demuxer_class = {
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.class_name = "avi",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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.category = AV_CLASS_CATEGORY_DEMUXER,
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};
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static const char avi_headers[][8] = {
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
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{ 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
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{ 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
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{ 0 }
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};
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static const AVMetadataConv avi_metadata_conv[] = {
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{ "strn", "title" },
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{ 0 },
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};
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static int avi_load_index(AVFormatContext *s);
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static int guess_ni_flag(AVFormatContext *s);
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#define print_tag(str, tag, size) \
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av_log(NULL, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%c%c%c%c size=0x%x\n", \
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avio_tell(pb), str, tag & 0xff, \
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(tag >> 8) & 0xff, \
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(tag >> 16) & 0xff, \
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(tag >> 24) & 0xff, \
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size)
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static inline int get_duration(AVIStream *ast, int len)
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{
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if (ast->sample_size)
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return len;
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else if (ast->dshow_block_align)
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return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
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else
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return 1;
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}
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static int get_riff(AVFormatContext *s, AVIOContext *pb)
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{
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AVIContext *avi = s->priv_data;
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char header[8] = {0};
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int i;
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/* check RIFF header */
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avio_read(pb, header, 4);
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avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
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avi->riff_end += avio_tell(pb); /* RIFF chunk end */
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avio_read(pb, header + 4, 4);
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for (i = 0; avi_headers[i][0]; i++)
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if (!memcmp(header, avi_headers[i], 8))
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break;
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if (!avi_headers[i][0])
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return AVERROR_INVALIDDATA;
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if (header[7] == 0x19)
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av_log(s, AV_LOG_INFO,
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"This file has been generated by a totally broken muxer.\n");
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return 0;
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}
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static int read_braindead_odml_indx(AVFormatContext *s, int frame_num)
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{
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AVIContext *avi = s->priv_data;
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AVIOContext *pb = s->pb;
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int longs_pre_entry = avio_rl16(pb);
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int index_sub_type = avio_r8(pb);
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int index_type = avio_r8(pb);
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int entries_in_use = avio_rl32(pb);
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int chunk_id = avio_rl32(pb);
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int64_t base = avio_rl64(pb);
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int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
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((chunk_id >> 8 & 0xFF) - '0');
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AVStream *st;
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AVIStream *ast;
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int i;
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int64_t last_pos = -1;
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int64_t filesize = avi->fsize;
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av_log(s, AV_LOG_TRACE,
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"longs_pre_entry:%d index_type:%d entries_in_use:%d "
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"chunk_id:%X base:%16"PRIX64" frame_num:%d\n",
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longs_pre_entry,
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index_type,
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entries_in_use,
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chunk_id,
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base,
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frame_num);
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if (stream_id >= s->nb_streams || stream_id < 0)
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return AVERROR_INVALIDDATA;
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st = s->streams[stream_id];
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ast = st->priv_data;
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if (index_sub_type)
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return AVERROR_INVALIDDATA;
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avio_rl32(pb);
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if (index_type && longs_pre_entry != 2)
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return AVERROR_INVALIDDATA;
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if (index_type > 1)
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return AVERROR_INVALIDDATA;
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if (filesize > 0 && base >= filesize) {
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av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
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if (base >> 32 == (base & 0xFFFFFFFF) &&
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(base & 0xFFFFFFFF) < filesize &&
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filesize <= 0xFFFFFFFF)
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base &= 0xFFFFFFFF;
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else
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return AVERROR_INVALIDDATA;
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}
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for (i = 0; i < entries_in_use; i++) {
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if (index_type) {
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int64_t pos = avio_rl32(pb) + base - 8;
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int len = avio_rl32(pb);
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int key = len >= 0;
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len &= 0x7FFFFFFF;
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av_log(s, AV_LOG_TRACE, "pos:%"PRId64", len:%X\n", pos, len);
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if (avio_feof(pb))
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return AVERROR_INVALIDDATA;
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if (last_pos == pos || pos == base - 8)
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avi->non_interleaved = 1;
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if (last_pos != pos && len)
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av_add_index_entry(st, pos, ast->cum_len, len, 0,
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key ? AVINDEX_KEYFRAME : 0);
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ast->cum_len += get_duration(ast, len);
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last_pos = pos;
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} else {
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int64_t offset, pos;
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int duration;
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offset = avio_rl64(pb);
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avio_rl32(pb); /* size */
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duration = avio_rl32(pb);
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if (avio_feof(pb))
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return AVERROR_INVALIDDATA;
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pos = avio_tell(pb);
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if (avi->odml_depth > MAX_ODML_DEPTH) {
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av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
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return AVERROR_INVALIDDATA;
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}
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if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
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return -1;
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avi->odml_depth++;
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read_braindead_odml_indx(s, frame_num);
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avi->odml_depth--;
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frame_num += duration;
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if (avio_seek(pb, pos, SEEK_SET) < 0) {
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av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
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return -1;
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}
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}
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}
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avi->index_loaded = 2;
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return 0;
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}
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static void clean_index(AVFormatContext *s)
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{
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int i;
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int64_t j;
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for (i = 0; i < s->nb_streams; i++) {
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AVStream *st = s->streams[i];
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AVIStream *ast = st->priv_data;
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int n = st->nb_index_entries;
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int max = ast->sample_size;
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int64_t pos, size, ts;
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if (n != 1 || ast->sample_size == 0)
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continue;
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while (max < 1024)
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max += max;
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pos = st->index_entries[0].pos;
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size = st->index_entries[0].size;
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ts = st->index_entries[0].timestamp;
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for (j = 0; j < size; j += max)
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av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
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AVINDEX_KEYFRAME);
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}
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}
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static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
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uint32_t size)
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{
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AVIOContext *pb = s->pb;
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char key[5] = { 0 };
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char *value;
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size += (size & 1);
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if (size == UINT_MAX)
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return AVERROR(EINVAL);
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value = av_malloc(size + 1);
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if (!value)
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return AVERROR(ENOMEM);
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if (avio_read(pb, value, size) != size)
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return AVERROR_INVALIDDATA;
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value[size] = 0;
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AV_WL32(key, tag);
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return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
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AV_DICT_DONT_STRDUP_VAL);
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}
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static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
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static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
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{
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char month[4], time[9], buffer[64];
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int i, day, year;
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/* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
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if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
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month, &day, time, &year) == 4) {
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for (i = 0; i < 12; i++)
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if (!av_strcasecmp(month, months[i])) {
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snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
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year, i + 1, day, time);
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av_dict_set(metadata, "creation_time", buffer, 0);
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}
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} else if (date[4] == '/' && date[7] == '/') {
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date[4] = date[7] = '-';
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av_dict_set(metadata, "creation_time", date, 0);
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}
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}
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static void avi_read_nikon(AVFormatContext *s, uint64_t end)
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{
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while (avio_tell(s->pb) < end) {
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uint32_t tag = avio_rl32(s->pb);
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uint32_t size = avio_rl32(s->pb);
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switch (tag) {
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case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
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{
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uint64_t tag_end = avio_tell(s->pb) + size;
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while (avio_tell(s->pb) < tag_end) {
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uint16_t tag = avio_rl16(s->pb);
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uint16_t size = avio_rl16(s->pb);
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const char *name = NULL;
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char buffer[64] = { 0 };
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size = FFMIN(size, tag_end - avio_tell(s->pb));
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size -= avio_read(s->pb, buffer,
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FFMIN(size, sizeof(buffer) - 1));
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switch (tag) {
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case 0x03:
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name = "maker";
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break;
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case 0x04:
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name = "model";
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break;
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case 0x13:
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name = "creation_time";
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if (buffer[4] == ':' && buffer[7] == ':')
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buffer[4] = buffer[7] = '-';
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break;
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}
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if (name)
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av_dict_set(&s->metadata, name, buffer, 0);
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avio_skip(s->pb, size);
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}
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break;
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}
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default:
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avio_skip(s->pb, size);
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break;
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}
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}
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}
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static int avi_extract_stream_metadata(AVStream *st)
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{
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GetByteContext gb;
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uint8_t *data = st->codec->extradata;
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int data_size = st->codec->extradata_size;
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int tag, offset;
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if (!data || data_size < 8) {
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return AVERROR_INVALIDDATA;
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}
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bytestream2_init(&gb, data, data_size);
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tag = bytestream2_get_le32(&gb);
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switch (tag) {
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case MKTAG('A', 'V', 'I', 'F'):
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// skip 4 byte padding
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bytestream2_skip(&gb, 4);
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offset = bytestream2_tell(&gb);
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bytestream2_init(&gb, data + offset, data_size - offset);
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// decode EXIF tags from IFD, AVI is always little-endian
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return avpriv_exif_decode_ifd(st->codec, &gb, 1, 0, &st->metadata);
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break;
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case MKTAG('C', 'A', 'S', 'I'):
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avpriv_request_sample(st->codec, "RIFF stream data tag type CASI (%u)", tag);
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break;
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case MKTAG('Z', 'o', 'r', 'a'):
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avpriv_request_sample(st->codec, "RIFF stream data tag type Zora (%u)", tag);
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break;
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default:
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break;
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}
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return 0;
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}
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static int calculate_bitrate(AVFormatContext *s)
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{
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AVIContext *avi = s->priv_data;
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int i, j;
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int64_t lensum = 0;
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int64_t maxpos = 0;
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for (i = 0; i<s->nb_streams; i++) {
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int64_t len = 0;
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AVStream *st = s->streams[i];
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if (!st->nb_index_entries)
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continue;
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for (j = 0; j < st->nb_index_entries; j++)
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len += st->index_entries[j].size;
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maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
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lensum += len;
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}
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if (maxpos < avi->io_fsize*9/10) // index does not cover the whole file
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return 0;
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if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
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return 0;
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for (i = 0; i<s->nb_streams; i++) {
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int64_t len = 0;
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AVStream *st = s->streams[i];
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int64_t duration;
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int64_t bitrate;
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for (j = 0; j < st->nb_index_entries; j++)
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len += st->index_entries[j].size;
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if (st->nb_index_entries < 2 || st->codec->bit_rate > 0)
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continue;
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duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
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bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
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if (bitrate <= INT_MAX && bitrate > 0) {
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st->codec->bit_rate = bitrate;
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}
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}
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return 1;
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}
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static int avi_read_header(AVFormatContext *s)
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{
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AVIContext *avi = s->priv_data;
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AVIOContext *pb = s->pb;
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unsigned int tag, tag1, handler;
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int codec_type, stream_index, frame_period;
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unsigned int size;
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int i;
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AVStream *st;
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AVIStream *ast = NULL;
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int avih_width = 0, avih_height = 0;
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int amv_file_format = 0;
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uint64_t list_end = 0;
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int ret;
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AVDictionaryEntry *dict_entry;
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avi->stream_index = -1;
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ret = get_riff(s, pb);
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if (ret < 0)
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return ret;
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av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
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avi->io_fsize = avi->fsize = avio_size(pb);
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if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
|
|
avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
|
|
|
|
/* first list tag */
|
|
stream_index = -1;
|
|
codec_type = -1;
|
|
frame_period = 0;
|
|
for (;;) {
|
|
if (avio_feof(pb))
|
|
goto fail;
|
|
tag = avio_rl32(pb);
|
|
size = avio_rl32(pb);
|
|
|
|
print_tag("tag", tag, size);
|
|
|
|
switch (tag) {
|
|
case MKTAG('L', 'I', 'S', 'T'):
|
|
list_end = avio_tell(pb) + size;
|
|
/* Ignored, except at start of video packets. */
|
|
tag1 = avio_rl32(pb);
|
|
|
|
print_tag("list", tag1, 0);
|
|
|
|
if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
|
|
avi->movi_list = avio_tell(pb) - 4;
|
|
if (size)
|
|
avi->movi_end = avi->movi_list + size + (size & 1);
|
|
else
|
|
avi->movi_end = avi->fsize;
|
|
av_log(NULL, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
|
|
goto end_of_header;
|
|
} else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
|
|
ff_read_riff_info(s, size - 4);
|
|
else if (tag1 == MKTAG('n', 'c', 'd', 't'))
|
|
avi_read_nikon(s, list_end);
|
|
|
|
break;
|
|
case MKTAG('I', 'D', 'I', 'T'):
|
|
{
|
|
unsigned char date[64] = { 0 };
|
|
size += (size & 1);
|
|
size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
|
|
avio_skip(pb, size);
|
|
avi_metadata_creation_time(&s->metadata, date);
|
|
break;
|
|
}
|
|
case MKTAG('d', 'm', 'l', 'h'):
|
|
avi->is_odml = 1;
|
|
avio_skip(pb, size + (size & 1));
|
|
break;
|
|
case MKTAG('a', 'm', 'v', 'h'):
|
|
amv_file_format = 1;
|
|
case MKTAG('a', 'v', 'i', 'h'):
|
|
/* AVI header */
|
|
/* using frame_period is bad idea */
|
|
frame_period = avio_rl32(pb);
|
|
avio_rl32(pb); /* max. bytes per second */
|
|
avio_rl32(pb);
|
|
avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
|
|
|
|
avio_skip(pb, 2 * 4);
|
|
avio_rl32(pb);
|
|
avio_rl32(pb);
|
|
avih_width = avio_rl32(pb);
|
|
avih_height = avio_rl32(pb);
|
|
|
|
avio_skip(pb, size - 10 * 4);
|
|
break;
|
|
case MKTAG('s', 't', 'r', 'h'):
|
|
/* stream header */
|
|
|
|
tag1 = avio_rl32(pb);
|
|
handler = avio_rl32(pb); /* codec tag */
|
|
|
|
if (tag1 == MKTAG('p', 'a', 'd', 's')) {
|
|
avio_skip(pb, size - 8);
|
|
break;
|
|
} else {
|
|
stream_index++;
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
goto fail;
|
|
|
|
st->id = stream_index;
|
|
ast = av_mallocz(sizeof(AVIStream));
|
|
if (!ast)
|
|
goto fail;
|
|
st->priv_data = ast;
|
|
}
|
|
if (amv_file_format)
|
|
tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
|
|
: MKTAG('v', 'i', 'd', 's');
|
|
|
|
print_tag("strh", tag1, -1);
|
|
|
|
if (tag1 == MKTAG('i', 'a', 'v', 's') ||
|
|
tag1 == MKTAG('i', 'v', 'a', 's')) {
|
|
int64_t dv_dur;
|
|
|
|
/* After some consideration -- I don't think we
|
|
* have to support anything but DV in type1 AVIs. */
|
|
if (s->nb_streams != 1)
|
|
goto fail;
|
|
|
|
if (handler != MKTAG('d', 'v', 's', 'd') &&
|
|
handler != MKTAG('d', 'v', 'h', 'd') &&
|
|
handler != MKTAG('d', 'v', 's', 'l'))
|
|
goto fail;
|
|
|
|
ast = s->streams[0]->priv_data;
|
|
av_freep(&s->streams[0]->codec->extradata);
|
|
av_freep(&s->streams[0]->codec);
|
|
if (s->streams[0]->info)
|
|
av_freep(&s->streams[0]->info->duration_error);
|
|
av_freep(&s->streams[0]->info);
|
|
av_freep(&s->streams[0]);
|
|
s->nb_streams = 0;
|
|
if (CONFIG_DV_DEMUXER) {
|
|
avi->dv_demux = avpriv_dv_init_demux(s);
|
|
if (!avi->dv_demux)
|
|
goto fail;
|
|
} else
|
|
goto fail;
|
|
s->streams[0]->priv_data = ast;
|
|
avio_skip(pb, 3 * 4);
|
|
ast->scale = avio_rl32(pb);
|
|
ast->rate = avio_rl32(pb);
|
|
avio_skip(pb, 4); /* start time */
|
|
|
|
dv_dur = avio_rl32(pb);
|
|
if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
|
|
dv_dur *= AV_TIME_BASE;
|
|
s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
|
|
}
|
|
/* else, leave duration alone; timing estimation in utils.c
|
|
* will make a guess based on bitrate. */
|
|
|
|
stream_index = s->nb_streams - 1;
|
|
avio_skip(pb, size - 9 * 4);
|
|
break;
|
|
}
|
|
|
|
av_assert0(stream_index < s->nb_streams);
|
|
ast->handler = handler;
|
|
|
|
avio_rl32(pb); /* flags */
|
|
avio_rl16(pb); /* priority */
|
|
avio_rl16(pb); /* language */
|
|
avio_rl32(pb); /* initial frame */
|
|
ast->scale = avio_rl32(pb);
|
|
ast->rate = avio_rl32(pb);
|
|
if (!(ast->scale && ast->rate)) {
|
|
av_log(s, AV_LOG_WARNING,
|
|
"scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
|
|
"(This file has been generated by broken software.)\n",
|
|
ast->scale,
|
|
ast->rate);
|
|
if (frame_period) {
|
|
ast->rate = 1000000;
|
|
ast->scale = frame_period;
|
|
} else {
|
|
ast->rate = 25;
|
|
ast->scale = 1;
|
|
}
|
|
}
|
|
avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
|
|
|
|
ast->cum_len = avio_rl32(pb); /* start */
|
|
st->nb_frames = avio_rl32(pb);
|
|
|
|
st->start_time = 0;
|
|
avio_rl32(pb); /* buffer size */
|
|
avio_rl32(pb); /* quality */
|
|
if (ast->cum_len*ast->scale/ast->rate > 3600) {
|
|
av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
|
|
ast->cum_len = 0;
|
|
}
|
|
ast->sample_size = avio_rl32(pb); /* sample ssize */
|
|
ast->cum_len *= FFMAX(1, ast->sample_size);
|
|
av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
|
|
ast->rate, ast->scale, ast->sample_size);
|
|
|
|
switch (tag1) {
|
|
case MKTAG('v', 'i', 'd', 's'):
|
|
codec_type = AVMEDIA_TYPE_VIDEO;
|
|
|
|
ast->sample_size = 0;
|
|
st->avg_frame_rate = av_inv_q(st->time_base);
|
|
break;
|
|
case MKTAG('a', 'u', 'd', 's'):
|
|
codec_type = AVMEDIA_TYPE_AUDIO;
|
|
break;
|
|
case MKTAG('t', 'x', 't', 's'):
|
|
codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
break;
|
|
case MKTAG('d', 'a', 't', 's'):
|
|
codec_type = AVMEDIA_TYPE_DATA;
|
|
break;
|
|
default:
|
|
av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
|
|
}
|
|
|
|
if (ast->sample_size < 0) {
|
|
if (s->error_recognition & AV_EF_EXPLODE) {
|
|
av_log(s, AV_LOG_ERROR,
|
|
"Invalid sample_size %d at stream %d\n",
|
|
ast->sample_size,
|
|
stream_index);
|
|
goto fail;
|
|
}
|
|
av_log(s, AV_LOG_WARNING,
|
|
"Invalid sample_size %d at stream %d "
|
|
"setting it to 0\n",
|
|
ast->sample_size,
|
|
stream_index);
|
|
ast->sample_size = 0;
|
|
}
|
|
|
|
if (ast->sample_size == 0) {
|
|
st->duration = st->nb_frames;
|
|
if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
|
|
av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
|
|
st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
|
|
}
|
|
}
|
|
ast->frame_offset = ast->cum_len;
|
|
avio_skip(pb, size - 12 * 4);
|
|
break;
|
|
case MKTAG('s', 't', 'r', 'f'):
|
|
/* stream header */
|
|
if (!size)
|
|
break;
|
|
if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
|
|
avio_skip(pb, size);
|
|
} else {
|
|
uint64_t cur_pos = avio_tell(pb);
|
|
unsigned esize;
|
|
if (cur_pos < list_end)
|
|
size = FFMIN(size, list_end - cur_pos);
|
|
st = s->streams[stream_index];
|
|
if (st->codec->codec_type != AVMEDIA_TYPE_UNKNOWN) {
|
|
avio_skip(pb, size);
|
|
break;
|
|
}
|
|
switch (codec_type) {
|
|
case AVMEDIA_TYPE_VIDEO:
|
|
if (amv_file_format) {
|
|
st->codec->width = avih_width;
|
|
st->codec->height = avih_height;
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_id = AV_CODEC_ID_AMV;
|
|
avio_skip(pb, size);
|
|
break;
|
|
}
|
|
tag1 = ff_get_bmp_header(pb, st, &esize);
|
|
|
|
if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
|
|
tag1 == MKTAG('D', 'X', 'S', 'A')) {
|
|
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
st->codec->codec_tag = tag1;
|
|
st->codec->codec_id = AV_CODEC_ID_XSUB;
|
|
break;
|
|
}
|
|
|
|
if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
|
|
if (esize == size-1 && (esize&1)) {
|
|
st->codec->extradata_size = esize - 10 * 4;
|
|
} else
|
|
st->codec->extradata_size = size - 10 * 4;
|
|
if (ff_get_extradata(st->codec, pb, st->codec->extradata_size) < 0)
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
// FIXME: check if the encoder really did this correctly
|
|
if (st->codec->extradata_size & 1)
|
|
avio_r8(pb);
|
|
|
|
/* Extract palette from extradata if bpp <= 8.
|
|
* This code assumes that extradata contains only palette.
|
|
* This is true for all paletted codecs implemented in
|
|
* FFmpeg. */
|
|
if (st->codec->extradata_size &&
|
|
(st->codec->bits_per_coded_sample <= 8)) {
|
|
int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
|
|
const uint8_t *pal_src;
|
|
|
|
pal_size = FFMIN(pal_size, st->codec->extradata_size);
|
|
pal_src = st->codec->extradata +
|
|
st->codec->extradata_size - pal_size;
|
|
/* Exclude the "BottomUp" field from the palette */
|
|
if (pal_src - st->codec->extradata >= 9 &&
|
|
!memcmp(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9))
|
|
pal_src -= 9;
|
|
for (i = 0; i < pal_size / 4; i++)
|
|
ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
|
|
ast->has_pal = 1;
|
|
}
|
|
|
|
print_tag("video", tag1, 0);
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_tag = tag1;
|
|
st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
|
|
tag1);
|
|
/* If codec is not found yet, try with the mov tags. */
|
|
if (!st->codec->codec_id) {
|
|
char tag_buf[32];
|
|
av_get_codec_tag_string(tag_buf, sizeof(tag_buf), tag1);
|
|
st->codec->codec_id =
|
|
ff_codec_get_id(ff_codec_movvideo_tags, tag1);
|
|
if (st->codec->codec_id)
|
|
av_log(s, AV_LOG_WARNING,
|
|
"mov tag found in avi (fourcc %s)\n",
|
|
tag_buf);
|
|
}
|
|
/* This is needed to get the pict type which is necessary
|
|
* for generating correct pts. */
|
|
st->need_parsing = AVSTREAM_PARSE_HEADERS;
|
|
|
|
if (st->codec->codec_id == AV_CODEC_ID_MPEG4 &&
|
|
ast->handler == MKTAG('X', 'V', 'I', 'D'))
|
|
st->codec->codec_tag = MKTAG('X', 'V', 'I', 'D');
|
|
|
|
if (st->codec->codec_tag == MKTAG('V', 'S', 'S', 'H'))
|
|
st->need_parsing = AVSTREAM_PARSE_FULL;
|
|
|
|
if (st->codec->codec_tag == 0 && st->codec->height > 0 &&
|
|
st->codec->extradata_size < 1U << 30) {
|
|
st->codec->extradata_size += 9;
|
|
if ((ret = av_reallocp(&st->codec->extradata,
|
|
st->codec->extradata_size +
|
|
AV_INPUT_BUFFER_PADDING_SIZE)) < 0) {
|
|
st->codec->extradata_size = 0;
|
|
return ret;
|
|
} else
|
|
memcpy(st->codec->extradata + st->codec->extradata_size - 9,
|
|
"BottomUp", 9);
|
|
}
|
|
st->codec->height = FFABS(st->codec->height);
|
|
|
|
// avio_skip(pb, size - 5 * 4);
|
|
break;
|
|
case AVMEDIA_TYPE_AUDIO:
|
|
ret = ff_get_wav_header(s, pb, st->codec, size, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
ast->dshow_block_align = st->codec->block_align;
|
|
if (ast->sample_size && st->codec->block_align &&
|
|
ast->sample_size != st->codec->block_align) {
|
|
av_log(s,
|
|
AV_LOG_WARNING,
|
|
"sample size (%d) != block align (%d)\n",
|
|
ast->sample_size,
|
|
st->codec->block_align);
|
|
ast->sample_size = st->codec->block_align;
|
|
}
|
|
/* 2-aligned
|
|
* (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
|
|
if (size & 1)
|
|
avio_skip(pb, 1);
|
|
/* Force parsing as several audio frames can be in
|
|
* one packet and timestamps refer to packet start. */
|
|
st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
|
|
/* ADTS header is in extradata, AAC without header must be
|
|
* stored as exact frames. Parser not needed and it will
|
|
* fail. */
|
|
if (st->codec->codec_id == AV_CODEC_ID_AAC &&
|
|
st->codec->extradata_size)
|
|
st->need_parsing = AVSTREAM_PARSE_NONE;
|
|
// The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
|
|
if (st->codec->codec_id == AV_CODEC_ID_FLAC)
|
|
st->need_parsing = AVSTREAM_PARSE_NONE;
|
|
/* AVI files with Xan DPCM audio (wrongly) declare PCM
|
|
* audio in the header but have Axan as stream_code_tag. */
|
|
if (ast->handler == AV_RL32("Axan")) {
|
|
st->codec->codec_id = AV_CODEC_ID_XAN_DPCM;
|
|
st->codec->codec_tag = 0;
|
|
ast->dshow_block_align = 0;
|
|
}
|
|
if (amv_file_format) {
|
|
st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
|
|
ast->dshow_block_align = 0;
|
|
}
|
|
if ((st->codec->codec_id == AV_CODEC_ID_AAC ||
|
|
st->codec->codec_id == AV_CODEC_ID_FLAC ||
|
|
st->codec->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
|
|
av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
|
|
ast->dshow_block_align = 0;
|
|
}
|
|
if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
|
|
st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
|
|
st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
|
|
av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
|
|
ast->sample_size = 0;
|
|
}
|
|
break;
|
|
case AVMEDIA_TYPE_SUBTITLE:
|
|
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
st->request_probe= 1;
|
|
avio_skip(pb, size);
|
|
break;
|
|
default:
|
|
st->codec->codec_type = AVMEDIA_TYPE_DATA;
|
|
st->codec->codec_id = AV_CODEC_ID_NONE;
|
|
st->codec->codec_tag = 0;
|
|
avio_skip(pb, size);
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case MKTAG('s', 't', 'r', 'd'):
|
|
if (stream_index >= (unsigned)s->nb_streams
|
|
|| s->streams[stream_index]->codec->extradata_size
|
|
|| s->streams[stream_index]->codec->codec_tag == MKTAG('H','2','6','4')) {
|
|
avio_skip(pb, size);
|
|
} else {
|
|
uint64_t cur_pos = avio_tell(pb);
|
|
if (cur_pos < list_end)
|
|
size = FFMIN(size, list_end - cur_pos);
|
|
st = s->streams[stream_index];
|
|
|
|
if (size<(1<<30)) {
|
|
if (ff_get_extradata(st->codec, pb, size) < 0)
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
if (st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
|
|
avio_r8(pb);
|
|
|
|
ret = avi_extract_stream_metadata(st);
|
|
if (ret < 0) {
|
|
av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
|
|
}
|
|
}
|
|
break;
|
|
case MKTAG('i', 'n', 'd', 'x'):
|
|
i = avio_tell(pb);
|
|
if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
|
|
avi->use_odml &&
|
|
read_braindead_odml_indx(s, 0) < 0 &&
|
|
(s->error_recognition & AV_EF_EXPLODE))
|
|
goto fail;
|
|
avio_seek(pb, i + size, SEEK_SET);
|
|
break;
|
|
case MKTAG('v', 'p', 'r', 'p'):
|
|
if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
|
|
AVRational active, active_aspect;
|
|
|
|
st = s->streams[stream_index];
|
|
avio_rl32(pb);
|
|
avio_rl32(pb);
|
|
avio_rl32(pb);
|
|
avio_rl32(pb);
|
|
avio_rl32(pb);
|
|
|
|
active_aspect.den = avio_rl16(pb);
|
|
active_aspect.num = avio_rl16(pb);
|
|
active.num = avio_rl32(pb);
|
|
active.den = avio_rl32(pb);
|
|
avio_rl32(pb); // nbFieldsPerFrame
|
|
|
|
if (active_aspect.num && active_aspect.den &&
|
|
active.num && active.den) {
|
|
st->sample_aspect_ratio = av_div_q(active_aspect, active);
|
|
av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
|
|
active_aspect.num, active_aspect.den,
|
|
active.num, active.den);
|
|
}
|
|
size -= 9 * 4;
|
|
}
|
|
avio_skip(pb, size);
|
|
break;
|
|
case MKTAG('s', 't', 'r', 'n'):
|
|
if (s->nb_streams) {
|
|
ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
|
|
if (ret < 0)
|
|
return ret;
|
|
break;
|
|
}
|
|
default:
|
|
if (size > 1000000) {
|
|
av_log(s, AV_LOG_ERROR,
|
|
"Something went wrong during header parsing, "
|
|
"I will ignore it and try to continue anyway.\n");
|
|
if (s->error_recognition & AV_EF_EXPLODE)
|
|
goto fail;
|
|
avi->movi_list = avio_tell(pb) - 4;
|
|
avi->movi_end = avi->fsize;
|
|
goto end_of_header;
|
|
}
|
|
/* skip tag */
|
|
size += (size & 1);
|
|
avio_skip(pb, size);
|
|
break;
|
|
}
|
|
}
|
|
|
|
end_of_header:
|
|
/* check stream number */
|
|
if (stream_index != s->nb_streams - 1) {
|
|
|
|
fail:
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (!avi->index_loaded && pb->seekable)
|
|
avi_load_index(s);
|
|
calculate_bitrate(s);
|
|
avi->index_loaded |= 1;
|
|
|
|
if ((ret = guess_ni_flag(s)) < 0)
|
|
return ret;
|
|
|
|
avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
|
|
|
|
dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
|
|
if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
if ( st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO
|
|
|| st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
|
|
st->need_parsing = AVSTREAM_PARSE_FULL;
|
|
}
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
if (st->nb_index_entries)
|
|
break;
|
|
}
|
|
// DV-in-AVI cannot be non-interleaved, if set this must be
|
|
// a mis-detection.
|
|
if (avi->dv_demux)
|
|
avi->non_interleaved = 0;
|
|
if (i == s->nb_streams && avi->non_interleaved) {
|
|
av_log(s, AV_LOG_WARNING,
|
|
"Non-interleaved AVI without index, switching to interleaved\n");
|
|
avi->non_interleaved = 0;
|
|
}
|
|
|
|
if (avi->non_interleaved) {
|
|
av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
|
|
clean_index(s);
|
|
}
|
|
|
|
ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
|
|
ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
|
|
{
|
|
if (pkt->size >= 7 &&
|
|
pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
|
|
!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
|
|
uint8_t desc[256];
|
|
int score = AVPROBE_SCORE_EXTENSION, ret;
|
|
AVIStream *ast = st->priv_data;
|
|
AVInputFormat *sub_demuxer;
|
|
AVRational time_base;
|
|
int size;
|
|
AVIOContext *pb = avio_alloc_context(pkt->data + 7,
|
|
pkt->size - 7,
|
|
0, NULL, NULL, NULL, NULL);
|
|
AVProbeData pd;
|
|
unsigned int desc_len = avio_rl32(pb);
|
|
|
|
if (desc_len > pb->buf_end - pb->buf_ptr)
|
|
goto error;
|
|
|
|
ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
|
|
avio_skip(pb, desc_len - ret);
|
|
if (*desc)
|
|
av_dict_set(&st->metadata, "title", desc, 0);
|
|
|
|
avio_rl16(pb); /* flags? */
|
|
avio_rl32(pb); /* data size */
|
|
|
|
size = pb->buf_end - pb->buf_ptr;
|
|
pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
|
|
.buf_size = size };
|
|
if (!pd.buf)
|
|
goto error;
|
|
memcpy(pd.buf, pb->buf_ptr, size);
|
|
sub_demuxer = av_probe_input_format2(&pd, 1, &score);
|
|
av_freep(&pd.buf);
|
|
if (!sub_demuxer)
|
|
goto error;
|
|
|
|
if (!(ast->sub_ctx = avformat_alloc_context()))
|
|
goto error;
|
|
|
|
ast->sub_ctx->pb = pb;
|
|
|
|
if (ff_copy_whitelists(ast->sub_ctx, s) < 0)
|
|
goto error;
|
|
|
|
if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
|
|
ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
|
|
*st->codec = *ast->sub_ctx->streams[0]->codec;
|
|
ast->sub_ctx->streams[0]->codec->extradata = NULL;
|
|
time_base = ast->sub_ctx->streams[0]->time_base;
|
|
avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
|
|
}
|
|
ast->sub_buffer = pkt->data;
|
|
memset(pkt, 0, sizeof(*pkt));
|
|
return 1;
|
|
|
|
error:
|
|
av_freep(&ast->sub_ctx);
|
|
av_freep(&pb);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
|
|
AVPacket *pkt)
|
|
{
|
|
AVIStream *ast, *next_ast = next_st->priv_data;
|
|
int64_t ts, next_ts, ts_min = INT64_MAX;
|
|
AVStream *st, *sub_st = NULL;
|
|
int i;
|
|
|
|
next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
|
|
AV_TIME_BASE_Q);
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
st = s->streams[i];
|
|
ast = st->priv_data;
|
|
if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
|
|
ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
|
|
if (ts <= next_ts && ts < ts_min) {
|
|
ts_min = ts;
|
|
sub_st = st;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (sub_st) {
|
|
ast = sub_st->priv_data;
|
|
*pkt = ast->sub_pkt;
|
|
pkt->stream_index = sub_st->index;
|
|
|
|
if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
|
|
ast->sub_pkt.data = NULL;
|
|
}
|
|
return sub_st;
|
|
}
|
|
|
|
static int get_stream_idx(const unsigned *d)
|
|
{
|
|
if (d[0] >= '0' && d[0] <= '9' &&
|
|
d[1] >= '0' && d[1] <= '9') {
|
|
return (d[0] - '0') * 10 + (d[1] - '0');
|
|
} else {
|
|
return 100; // invalid stream ID
|
|
}
|
|
}
|
|
|
|
/**
|
|
*
|
|
* @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
|
|
*/
|
|
static int avi_sync(AVFormatContext *s, int exit_early)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
int n;
|
|
unsigned int d[8];
|
|
unsigned int size;
|
|
int64_t i, sync;
|
|
|
|
start_sync:
|
|
memset(d, -1, sizeof(d));
|
|
for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
|
|
int j;
|
|
|
|
for (j = 0; j < 7; j++)
|
|
d[j] = d[j + 1];
|
|
d[7] = avio_r8(pb);
|
|
|
|
size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
|
|
|
|
n = get_stream_idx(d + 2);
|
|
ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
|
|
d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
|
|
if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
|
|
continue;
|
|
|
|
// parse ix##
|
|
if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
|
|
// parse JUNK
|
|
(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
|
|
(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) {
|
|
avio_skip(pb, size);
|
|
goto start_sync;
|
|
}
|
|
|
|
// parse stray LIST
|
|
if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
|
|
avio_skip(pb, 4);
|
|
goto start_sync;
|
|
}
|
|
|
|
n = get_stream_idx(d);
|
|
|
|
if (!((i - avi->last_pkt_pos) & 1) &&
|
|
get_stream_idx(d + 1) < s->nb_streams)
|
|
continue;
|
|
|
|
// detect ##ix chunk and skip
|
|
if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
|
|
avio_skip(pb, size);
|
|
goto start_sync;
|
|
}
|
|
|
|
if (avi->dv_demux && n != 0)
|
|
continue;
|
|
|
|
// parse ##dc/##wb
|
|
if (n < s->nb_streams) {
|
|
AVStream *st;
|
|
AVIStream *ast;
|
|
st = s->streams[n];
|
|
ast = st->priv_data;
|
|
|
|
if (!ast) {
|
|
av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
|
|
continue;
|
|
}
|
|
|
|
if (s->nb_streams >= 2) {
|
|
AVStream *st1 = s->streams[1];
|
|
AVIStream *ast1 = st1->priv_data;
|
|
// workaround for broken small-file-bug402.avi
|
|
if ( d[2] == 'w' && d[3] == 'b'
|
|
&& n == 0
|
|
&& st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
|
|
&& st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
|
|
&& ast->prefix == 'd'*256+'c'
|
|
&& (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
|
|
) {
|
|
n = 1;
|
|
st = st1;
|
|
ast = ast1;
|
|
av_log(s, AV_LOG_WARNING,
|
|
"Invalid stream + prefix combination, assuming audio.\n");
|
|
}
|
|
}
|
|
|
|
if (!avi->dv_demux &&
|
|
((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
|
|
// FIXME: needs a little reordering
|
|
(st->discard >= AVDISCARD_NONKEY &&
|
|
!(pkt->flags & AV_PKT_FLAG_KEY)) */
|
|
|| st->discard >= AVDISCARD_ALL)) {
|
|
if (!exit_early) {
|
|
ast->frame_offset += get_duration(ast, size);
|
|
avio_skip(pb, size);
|
|
goto start_sync;
|
|
}
|
|
}
|
|
|
|
if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
|
|
int k = avio_r8(pb);
|
|
int last = (k + avio_r8(pb) - 1) & 0xFF;
|
|
|
|
avio_rl16(pb); // flags
|
|
|
|
// b + (g << 8) + (r << 16);
|
|
for (; k <= last; k++)
|
|
ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
|
|
|
|
ast->has_pal = 1;
|
|
goto start_sync;
|
|
} else if (((ast->prefix_count < 5 || sync + 9 > i) &&
|
|
d[2] < 128 && d[3] < 128) ||
|
|
d[2] * 256 + d[3] == ast->prefix /* ||
|
|
(d[2] == 'd' && d[3] == 'c') ||
|
|
(d[2] == 'w' && d[3] == 'b') */) {
|
|
if (exit_early)
|
|
return 0;
|
|
if (d[2] * 256 + d[3] == ast->prefix)
|
|
ast->prefix_count++;
|
|
else {
|
|
ast->prefix = d[2] * 256 + d[3];
|
|
ast->prefix_count = 0;
|
|
}
|
|
|
|
avi->stream_index = n;
|
|
ast->packet_size = size + 8;
|
|
ast->remaining = size;
|
|
|
|
if (size) {
|
|
uint64_t pos = avio_tell(pb) - 8;
|
|
if (!st->index_entries || !st->nb_index_entries ||
|
|
st->index_entries[st->nb_index_entries - 1].pos < pos) {
|
|
av_add_index_entry(st, pos, ast->frame_offset, size,
|
|
0, AVINDEX_KEYFRAME);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (pb->error)
|
|
return pb->error;
|
|
return AVERROR_EOF;
|
|
}
|
|
|
|
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
int err;
|
|
#if FF_API_DESTRUCT_PACKET
|
|
void *dstr;
|
|
#endif
|
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) {
|
|
int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
|
|
if (size >= 0)
|
|
return size;
|
|
else
|
|
goto resync;
|
|
}
|
|
|
|
if (avi->non_interleaved) {
|
|
int best_stream_index = 0;
|
|
AVStream *best_st = NULL;
|
|
AVIStream *best_ast;
|
|
int64_t best_ts = INT64_MAX;
|
|
int i;
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
AVIStream *ast = st->priv_data;
|
|
int64_t ts = ast->frame_offset;
|
|
int64_t last_ts;
|
|
|
|
if (!st->nb_index_entries)
|
|
continue;
|
|
|
|
last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
|
|
if (!ast->remaining && ts > last_ts)
|
|
continue;
|
|
|
|
ts = av_rescale_q(ts, st->time_base,
|
|
(AVRational) { FFMAX(1, ast->sample_size),
|
|
AV_TIME_BASE });
|
|
|
|
av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
|
|
st->time_base.num, st->time_base.den, ast->frame_offset);
|
|
if (ts < best_ts) {
|
|
best_ts = ts;
|
|
best_st = st;
|
|
best_stream_index = i;
|
|
}
|
|
}
|
|
if (!best_st)
|
|
return AVERROR_EOF;
|
|
|
|
best_ast = best_st->priv_data;
|
|
best_ts = best_ast->frame_offset;
|
|
if (best_ast->remaining) {
|
|
i = av_index_search_timestamp(best_st,
|
|
best_ts,
|
|
AVSEEK_FLAG_ANY |
|
|
AVSEEK_FLAG_BACKWARD);
|
|
} else {
|
|
i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
|
|
if (i >= 0)
|
|
best_ast->frame_offset = best_st->index_entries[i].timestamp;
|
|
}
|
|
|
|
if (i >= 0) {
|
|
int64_t pos = best_st->index_entries[i].pos;
|
|
pos += best_ast->packet_size - best_ast->remaining;
|
|
if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
|
|
return AVERROR_EOF;
|
|
|
|
av_assert0(best_ast->remaining <= best_ast->packet_size);
|
|
|
|
avi->stream_index = best_stream_index;
|
|
if (!best_ast->remaining)
|
|
best_ast->packet_size =
|
|
best_ast->remaining = best_st->index_entries[i].size;
|
|
}
|
|
else
|
|
return AVERROR_EOF;
|
|
}
|
|
|
|
resync:
|
|
if (avi->stream_index >= 0) {
|
|
AVStream *st = s->streams[avi->stream_index];
|
|
AVIStream *ast = st->priv_data;
|
|
int size, err;
|
|
|
|
if (get_subtitle_pkt(s, st, pkt))
|
|
return 0;
|
|
|
|
// minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
|
|
if (ast->sample_size <= 1)
|
|
size = INT_MAX;
|
|
else if (ast->sample_size < 32)
|
|
// arbitrary multiplier to avoid tiny packets for raw PCM data
|
|
size = 1024 * ast->sample_size;
|
|
else
|
|
size = ast->sample_size;
|
|
|
|
if (size > ast->remaining)
|
|
size = ast->remaining;
|
|
avi->last_pkt_pos = avio_tell(pb);
|
|
err = av_get_packet(pb, pkt, size);
|
|
if (err < 0)
|
|
return err;
|
|
size = err;
|
|
|
|
if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
|
|
uint8_t *pal;
|
|
pal = av_packet_new_side_data(pkt,
|
|
AV_PKT_DATA_PALETTE,
|
|
AVPALETTE_SIZE);
|
|
if (!pal) {
|
|
av_log(s, AV_LOG_ERROR,
|
|
"Failed to allocate data for palette\n");
|
|
} else {
|
|
memcpy(pal, ast->pal, AVPALETTE_SIZE);
|
|
ast->has_pal = 0;
|
|
}
|
|
}
|
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) {
|
|
AVBufferRef *avbuf = pkt->buf;
|
|
#if FF_API_DESTRUCT_PACKET
|
|
FF_DISABLE_DEPRECATION_WARNINGS
|
|
dstr = pkt->destruct;
|
|
FF_ENABLE_DEPRECATION_WARNINGS
|
|
#endif
|
|
size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
|
|
pkt->data, pkt->size, pkt->pos);
|
|
#if FF_API_DESTRUCT_PACKET
|
|
FF_DISABLE_DEPRECATION_WARNINGS
|
|
pkt->destruct = dstr;
|
|
FF_ENABLE_DEPRECATION_WARNINGS
|
|
#endif
|
|
pkt->buf = avbuf;
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
if (size < 0)
|
|
av_free_packet(pkt);
|
|
} else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
|
|
!st->codec->codec_tag && read_gab2_sub(s, st, pkt)) {
|
|
ast->frame_offset++;
|
|
avi->stream_index = -1;
|
|
ast->remaining = 0;
|
|
goto resync;
|
|
} else {
|
|
/* XXX: How to handle B-frames in AVI? */
|
|
pkt->dts = ast->frame_offset;
|
|
// pkt->dts += ast->start;
|
|
if (ast->sample_size)
|
|
pkt->dts /= ast->sample_size;
|
|
av_log(s, AV_LOG_TRACE,
|
|
"dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
|
|
"base:%d st:%d size:%d\n",
|
|
pkt->dts,
|
|
ast->frame_offset,
|
|
ast->scale,
|
|
ast->rate,
|
|
ast->sample_size,
|
|
AV_TIME_BASE,
|
|
avi->stream_index,
|
|
size);
|
|
pkt->stream_index = avi->stream_index;
|
|
|
|
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
|
|
AVIndexEntry *e;
|
|
int index;
|
|
|
|
index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY);
|
|
e = &st->index_entries[index];
|
|
|
|
if (index >= 0 && e->timestamp == ast->frame_offset) {
|
|
if (index == st->nb_index_entries-1) {
|
|
int key=1;
|
|
uint32_t state=-1;
|
|
if (st->codec->codec_id == AV_CODEC_ID_MPEG4) {
|
|
const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
|
|
while (ptr < end) {
|
|
ptr = avpriv_find_start_code(ptr, end, &state);
|
|
if (state == 0x1B6 && ptr < end) {
|
|
key = !(*ptr & 0xC0);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (!key)
|
|
e->flags &= ~AVINDEX_KEYFRAME;
|
|
}
|
|
if (e->flags & AVINDEX_KEYFRAME)
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
}
|
|
} else {
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
}
|
|
ast->frame_offset += get_duration(ast, pkt->size);
|
|
}
|
|
ast->remaining -= err;
|
|
if (!ast->remaining) {
|
|
avi->stream_index = -1;
|
|
ast->packet_size = 0;
|
|
}
|
|
|
|
if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
|
|
av_free_packet(pkt);
|
|
goto resync;
|
|
}
|
|
ast->seek_pos= 0;
|
|
|
|
if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
|
|
int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
|
|
|
|
if (avi->dts_max - dts > 2*AV_TIME_BASE) {
|
|
avi->non_interleaved= 1;
|
|
av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
|
|
}else if (avi->dts_max < dts)
|
|
avi->dts_max = dts;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
if ((err = avi_sync(s, 0)) < 0)
|
|
return err;
|
|
goto resync;
|
|
}
|
|
|
|
/* XXX: We make the implicit supposition that the positions are sorted
|
|
* for each stream. */
|
|
static int avi_read_idx1(AVFormatContext *s, int size)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
int nb_index_entries, i;
|
|
AVStream *st;
|
|
AVIStream *ast;
|
|
unsigned int index, tag, flags, pos, len, first_packet = 1;
|
|
unsigned last_pos = -1;
|
|
unsigned last_idx = -1;
|
|
int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
|
|
int anykey = 0;
|
|
|
|
nb_index_entries = size / 16;
|
|
if (nb_index_entries <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
idx1_pos = avio_tell(pb);
|
|
avio_seek(pb, avi->movi_list + 4, SEEK_SET);
|
|
if (avi_sync(s, 1) == 0)
|
|
first_packet_pos = avio_tell(pb) - 8;
|
|
avi->stream_index = -1;
|
|
avio_seek(pb, idx1_pos, SEEK_SET);
|
|
|
|
if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")) {
|
|
first_packet_pos = 0;
|
|
data_offset = avi->movi_list;
|
|
}
|
|
|
|
/* Read the entries and sort them in each stream component. */
|
|
for (i = 0; i < nb_index_entries; i++) {
|
|
if (avio_feof(pb))
|
|
return -1;
|
|
|
|
tag = avio_rl32(pb);
|
|
flags = avio_rl32(pb);
|
|
pos = avio_rl32(pb);
|
|
len = avio_rl32(pb);
|
|
av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
|
|
i, tag, flags, pos, len);
|
|
|
|
index = ((tag & 0xff) - '0') * 10;
|
|
index += (tag >> 8 & 0xff) - '0';
|
|
if (index >= s->nb_streams)
|
|
continue;
|
|
st = s->streams[index];
|
|
ast = st->priv_data;
|
|
|
|
if (first_packet && first_packet_pos) {
|
|
data_offset = first_packet_pos - pos;
|
|
first_packet = 0;
|
|
}
|
|
pos += data_offset;
|
|
|
|
av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
|
|
|
|
// even if we have only a single stream, we should
|
|
// switch to non-interleaved to get correct timestamps
|
|
if (last_pos == pos)
|
|
avi->non_interleaved = 1;
|
|
if (last_idx != pos && len) {
|
|
av_add_index_entry(st, pos, ast->cum_len, len, 0,
|
|
(flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
|
|
last_idx= pos;
|
|
}
|
|
ast->cum_len += get_duration(ast, len);
|
|
last_pos = pos;
|
|
anykey |= flags&AVIIF_INDEX;
|
|
}
|
|
if (!anykey) {
|
|
for (index = 0; index < s->nb_streams; index++) {
|
|
st = s->streams[index];
|
|
if (st->nb_index_entries)
|
|
st->index_entries[0].flags |= AVINDEX_KEYFRAME;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Scan the index and consider any file with streams more than
|
|
* 2 seconds or 64MB apart non-interleaved. */
|
|
static int check_stream_max_drift(AVFormatContext *s)
|
|
{
|
|
int64_t min_pos, pos;
|
|
int i;
|
|
int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
|
|
if (!idx)
|
|
return AVERROR(ENOMEM);
|
|
for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
|
|
int64_t max_dts = INT64_MIN / 2;
|
|
int64_t min_dts = INT64_MAX / 2;
|
|
int64_t max_buffer = 0;
|
|
|
|
min_pos = INT64_MAX;
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
AVIStream *ast = st->priv_data;
|
|
int n = st->nb_index_entries;
|
|
while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
|
|
idx[i]++;
|
|
if (idx[i] < n) {
|
|
int64_t dts;
|
|
dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
|
|
FFMAX(ast->sample_size, 1),
|
|
st->time_base, AV_TIME_BASE_Q);
|
|
min_dts = FFMIN(min_dts, dts);
|
|
min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
|
|
}
|
|
}
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
AVIStream *ast = st->priv_data;
|
|
|
|
if (idx[i] && min_dts != INT64_MAX / 2) {
|
|
int64_t dts;
|
|
dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
|
|
FFMAX(ast->sample_size, 1),
|
|
st->time_base, AV_TIME_BASE_Q);
|
|
max_dts = FFMAX(max_dts, dts);
|
|
max_buffer = FFMAX(max_buffer,
|
|
av_rescale(dts - min_dts,
|
|
st->codec->bit_rate,
|
|
AV_TIME_BASE));
|
|
}
|
|
}
|
|
if (max_dts - min_dts > 2 * AV_TIME_BASE ||
|
|
max_buffer > 1024 * 1024 * 8 * 8) {
|
|
av_free(idx);
|
|
return 1;
|
|
}
|
|
}
|
|
av_free(idx);
|
|
return 0;
|
|
}
|
|
|
|
static int guess_ni_flag(AVFormatContext *s)
|
|
{
|
|
int i;
|
|
int64_t last_start = 0;
|
|
int64_t first_end = INT64_MAX;
|
|
int64_t oldpos = avio_tell(s->pb);
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
int n = st->nb_index_entries;
|
|
unsigned int size;
|
|
|
|
if (n <= 0)
|
|
continue;
|
|
|
|
if (n >= 2) {
|
|
int64_t pos = st->index_entries[0].pos;
|
|
unsigned tag[2];
|
|
avio_seek(s->pb, pos, SEEK_SET);
|
|
tag[0] = avio_r8(s->pb);
|
|
tag[1] = avio_r8(s->pb);
|
|
avio_rl16(s->pb);
|
|
size = avio_rl32(s->pb);
|
|
if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
|
|
last_start = INT64_MAX;
|
|
}
|
|
|
|
if (st->index_entries[0].pos > last_start)
|
|
last_start = st->index_entries[0].pos;
|
|
if (st->index_entries[n - 1].pos < first_end)
|
|
first_end = st->index_entries[n - 1].pos;
|
|
}
|
|
avio_seek(s->pb, oldpos, SEEK_SET);
|
|
|
|
if (last_start > first_end)
|
|
return 1;
|
|
|
|
return check_stream_max_drift(s);
|
|
}
|
|
|
|
static int avi_load_index(AVFormatContext *s)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
uint32_t tag, size;
|
|
int64_t pos = avio_tell(pb);
|
|
int64_t next;
|
|
int ret = -1;
|
|
|
|
if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
|
|
goto the_end; // maybe truncated file
|
|
av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
|
|
for (;;) {
|
|
tag = avio_rl32(pb);
|
|
size = avio_rl32(pb);
|
|
if (avio_feof(pb))
|
|
break;
|
|
next = avio_tell(pb) + size + (size & 1);
|
|
|
|
av_log(s, AV_LOG_TRACE, "tag=%c%c%c%c size=0x%x\n",
|
|
tag & 0xff,
|
|
(tag >> 8) & 0xff,
|
|
(tag >> 16) & 0xff,
|
|
(tag >> 24) & 0xff,
|
|
size);
|
|
|
|
if (tag == MKTAG('i', 'd', 'x', '1') &&
|
|
avi_read_idx1(s, size) >= 0) {
|
|
avi->index_loaded=2;
|
|
ret = 0;
|
|
}else if (tag == MKTAG('L', 'I', 'S', 'T')) {
|
|
uint32_t tag1 = avio_rl32(pb);
|
|
|
|
if (tag1 == MKTAG('I', 'N', 'F', 'O'))
|
|
ff_read_riff_info(s, size - 4);
|
|
}else if (!ret)
|
|
break;
|
|
|
|
if (avio_seek(pb, next, SEEK_SET) < 0)
|
|
break; // something is wrong here
|
|
}
|
|
|
|
the_end:
|
|
avio_seek(pb, pos, SEEK_SET);
|
|
return ret;
|
|
}
|
|
|
|
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
|
|
{
|
|
AVIStream *ast2 = st2->priv_data;
|
|
int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
|
|
av_free_packet(&ast2->sub_pkt);
|
|
if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
|
|
avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
|
|
ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
|
|
}
|
|
|
|
static int avi_read_seek(AVFormatContext *s, int stream_index,
|
|
int64_t timestamp, int flags)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVStream *st;
|
|
int i, index;
|
|
int64_t pos, pos_min;
|
|
AVIStream *ast;
|
|
|
|
/* Does not matter which stream is requested dv in avi has the
|
|
* stream information in the first video stream.
|
|
*/
|
|
if (avi->dv_demux)
|
|
stream_index = 0;
|
|
|
|
if (!avi->index_loaded) {
|
|
/* we only load the index on demand */
|
|
avi_load_index(s);
|
|
avi->index_loaded |= 1;
|
|
}
|
|
av_assert0(stream_index >= 0);
|
|
|
|
st = s->streams[stream_index];
|
|
ast = st->priv_data;
|
|
index = av_index_search_timestamp(st,
|
|
timestamp * FFMAX(ast->sample_size, 1),
|
|
flags);
|
|
if (index < 0) {
|
|
if (st->nb_index_entries > 0)
|
|
av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
|
|
timestamp * FFMAX(ast->sample_size, 1),
|
|
st->index_entries[0].timestamp,
|
|
st->index_entries[st->nb_index_entries - 1].timestamp);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
/* find the position */
|
|
pos = st->index_entries[index].pos;
|
|
timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
|
|
|
|
av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
|
|
timestamp, index, st->index_entries[index].timestamp);
|
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) {
|
|
/* One and only one real stream for DV in AVI, and it has video */
|
|
/* offsets. Calling with other stream indexes should have failed */
|
|
/* the av_index_search_timestamp call above. */
|
|
|
|
if (avio_seek(s->pb, pos, SEEK_SET) < 0)
|
|
return -1;
|
|
|
|
/* Feed the DV video stream version of the timestamp to the */
|
|
/* DV demux so it can synthesize correct timestamps. */
|
|
ff_dv_offset_reset(avi->dv_demux, timestamp);
|
|
|
|
avi->stream_index = -1;
|
|
return 0;
|
|
}
|
|
|
|
pos_min = pos;
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st2 = s->streams[i];
|
|
AVIStream *ast2 = st2->priv_data;
|
|
|
|
ast2->packet_size =
|
|
ast2->remaining = 0;
|
|
|
|
if (ast2->sub_ctx) {
|
|
seek_subtitle(st, st2, timestamp);
|
|
continue;
|
|
}
|
|
|
|
if (st2->nb_index_entries <= 0)
|
|
continue;
|
|
|
|
// av_assert1(st2->codec->block_align);
|
|
av_assert0(fabs(av_q2d(st2->time_base) - ast2->scale / (double)ast2->rate) < av_q2d(st2->time_base) * 0.00000001);
|
|
index = av_index_search_timestamp(st2,
|
|
av_rescale_q(timestamp,
|
|
st->time_base,
|
|
st2->time_base) *
|
|
FFMAX(ast2->sample_size, 1),
|
|
flags |
|
|
AVSEEK_FLAG_BACKWARD |
|
|
(st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
|
|
if (index < 0)
|
|
index = 0;
|
|
ast2->seek_pos = st2->index_entries[index].pos;
|
|
pos_min = FFMIN(pos_min,ast2->seek_pos);
|
|
}
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st2 = s->streams[i];
|
|
AVIStream *ast2 = st2->priv_data;
|
|
|
|
if (ast2->sub_ctx || st2->nb_index_entries <= 0)
|
|
continue;
|
|
|
|
index = av_index_search_timestamp(
|
|
st2,
|
|
av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
|
|
flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
|
|
if (index < 0)
|
|
index = 0;
|
|
while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
|
|
index--;
|
|
ast2->frame_offset = st2->index_entries[index].timestamp;
|
|
}
|
|
|
|
/* do the seek */
|
|
if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
|
|
av_log(s, AV_LOG_ERROR, "Seek failed\n");
|
|
return -1;
|
|
}
|
|
avi->stream_index = -1;
|
|
avi->dts_max = INT_MIN;
|
|
return 0;
|
|
}
|
|
|
|
static int avi_read_close(AVFormatContext *s)
|
|
{
|
|
int i;
|
|
AVIContext *avi = s->priv_data;
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
AVIStream *ast = st->priv_data;
|
|
if (ast) {
|
|
if (ast->sub_ctx) {
|
|
av_freep(&ast->sub_ctx->pb);
|
|
avformat_close_input(&ast->sub_ctx);
|
|
}
|
|
av_freep(&ast->sub_buffer);
|
|
av_free_packet(&ast->sub_pkt);
|
|
}
|
|
}
|
|
|
|
av_freep(&avi->dv_demux);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int avi_probe(AVProbeData *p)
|
|
{
|
|
int i;
|
|
|
|
/* check file header */
|
|
for (i = 0; avi_headers[i][0]; i++)
|
|
if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
|
|
AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
|
|
return AVPROBE_SCORE_MAX;
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_avi_demuxer = {
|
|
.name = "avi",
|
|
.long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
|
|
.priv_data_size = sizeof(AVIContext),
|
|
.extensions = "avi",
|
|
.read_probe = avi_probe,
|
|
.read_header = avi_read_header,
|
|
.read_packet = avi_read_packet,
|
|
.read_close = avi_read_close,
|
|
.read_seek = avi_read_seek,
|
|
.priv_class = &demuxer_class,
|
|
};
|