251 lines
8.4 KiB
C
251 lines
8.4 KiB
C
/*
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* Flash Compatible Streaming Format demuxer
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* Copyright (c) 2000 Fabrice Bellard
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* Copyright (c) 2003 Tinic Uro
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "libavutil/channel_layout.h"
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#include "libavutil/intreadwrite.h"
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#include "swf.h"
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static const AVCodecTag swf_audio_codec_tags[] = {
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{ AV_CODEC_ID_PCM_S16LE, 0x00 },
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{ AV_CODEC_ID_ADPCM_SWF, 0x01 },
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{ AV_CODEC_ID_MP3, 0x02 },
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{ AV_CODEC_ID_PCM_S16LE, 0x03 },
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// { AV_CODEC_ID_NELLYMOSER, 0x06 },
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{ AV_CODEC_ID_NONE, 0 },
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};
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static int get_swf_tag(AVIOContext *pb, int *len_ptr)
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{
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int tag, len;
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if (pb->eof_reached)
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return -1;
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tag = avio_rl16(pb);
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len = tag & 0x3f;
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tag = tag >> 6;
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if (len == 0x3f) {
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len = avio_rl32(pb);
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}
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*len_ptr = len;
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return tag;
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}
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static int swf_probe(AVProbeData *p)
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{
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/* check file header */
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if ((p->buf[0] == 'F' || p->buf[0] == 'C') && p->buf[1] == 'W' &&
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p->buf[2] == 'S')
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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static int swf_read_header(AVFormatContext *s)
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{
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SWFContext *swf = s->priv_data;
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AVIOContext *pb = s->pb;
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int nbits, len, tag;
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tag = avio_rb32(pb) & 0xffffff00;
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if (tag == MKBETAG('C', 'W', 'S', 0)) {
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av_log(s, AV_LOG_ERROR, "Compressed SWF format not supported\n");
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return AVERROR(EIO);
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}
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if (tag != MKBETAG('F', 'W', 'S', 0))
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return AVERROR(EIO);
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avio_rl32(pb);
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/* skip rectangle size */
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nbits = avio_r8(pb) >> 3;
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len = (4 * nbits - 3 + 7) / 8;
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avio_skip(pb, len);
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swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
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avio_rl16(pb); /* frame count */
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swf->samples_per_frame = 0;
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s->ctx_flags |= AVFMTCTX_NOHEADER;
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return 0;
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}
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static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SWFContext *swf = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *vst = NULL, *ast = NULL, *st = 0;
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int tag, len, i, frame, v, res;
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for(;;) {
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uint64_t pos = avio_tell(pb);
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tag = get_swf_tag(pb, &len);
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if (tag < 0)
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return AVERROR(EIO);
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if (len < 0) {
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av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
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return AVERROR_INVALIDDATA;
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}
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if (tag == TAG_VIDEOSTREAM) {
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int ch_id = avio_rl16(pb);
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len -= 2;
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for (i=0; i<s->nb_streams; i++) {
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st = s->streams[i];
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if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
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goto skip;
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}
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avio_rl16(pb);
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avio_rl16(pb);
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avio_rl16(pb);
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avio_r8(pb);
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/* Check for FLV1 */
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vst = avformat_new_stream(s, NULL);
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if (!vst)
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return -1;
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vst->id = ch_id;
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vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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vst->codec->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
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avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
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len -= 8;
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} else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
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/* streaming found */
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int sample_rate_code;
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for (i=0; i<s->nb_streams; i++) {
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st = s->streams[i];
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if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
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goto skip;
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}
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avio_r8(pb);
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v = avio_r8(pb);
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swf->samples_per_frame = avio_rl16(pb);
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ast = avformat_new_stream(s, NULL);
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if (!ast)
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return -1;
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ast->id = -1; /* -1 to avoid clash with video stream ch_id */
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if (v & 1) {
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ast->codec->channels = 2;
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ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
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} else {
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ast->codec->channels = 1;
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ast->codec->channel_layout = AV_CH_LAYOUT_MONO;
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}
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ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, (v>>4) & 15);
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ast->need_parsing = AVSTREAM_PARSE_FULL;
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sample_rate_code= (v>>2) & 3;
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ast->codec->sample_rate = 44100 >> (3 - sample_rate_code);
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avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
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len -= 4;
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} else if (tag == TAG_VIDEOFRAME) {
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int ch_id = avio_rl16(pb);
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len -= 2;
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for(i=0; i<s->nb_streams; i++) {
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st = s->streams[i];
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if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
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frame = avio_rl16(pb);
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len -= 2;
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if (len <= 0)
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goto skip;
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if ((res = av_get_packet(pb, pkt, len)) < 0)
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return res;
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pkt->pos = pos;
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pkt->pts = frame;
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pkt->stream_index = st->index;
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return pkt->size;
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}
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}
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} else if (tag == TAG_STREAMBLOCK) {
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for (i = 0; i < s->nb_streams; i++) {
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st = s->streams[i];
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if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
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if (st->codec->codec_id == AV_CODEC_ID_MP3) {
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avio_skip(pb, 4);
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len -= 4;
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if (len <= 0)
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goto skip;
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if ((res = av_get_packet(pb, pkt, len)) < 0)
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return res;
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} else { // ADPCM, PCM
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if (len <= 0)
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goto skip;
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if ((res = av_get_packet(pb, pkt, len)) < 0)
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return res;
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}
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pkt->pos = pos;
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pkt->stream_index = st->index;
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return pkt->size;
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}
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}
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} else if (tag == TAG_JPEG2) {
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for (i=0; i<s->nb_streams; i++) {
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st = s->streams[i];
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if (st->codec->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
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break;
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}
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if (i == s->nb_streams) {
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vst = avformat_new_stream(s, NULL);
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if (!vst)
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return -1;
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vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
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vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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vst->codec->codec_id = AV_CODEC_ID_MJPEG;
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avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
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st = vst;
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}
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avio_rl16(pb); /* BITMAP_ID */
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len -= 2;
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if (len < 4)
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goto skip;
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if ((res = av_new_packet(pkt, len)) < 0)
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return res;
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avio_read(pb, pkt->data, 4);
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if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
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AV_RB32(pkt->data) == 0xffd9ffd8) {
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/* old SWF files containing SOI/EOI as data start */
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/* files created by swink have reversed tag */
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pkt->size -= 4;
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avio_read(pb, pkt->data, pkt->size);
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} else {
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avio_read(pb, pkt->data + 4, pkt->size - 4);
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}
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pkt->pos = pos;
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pkt->stream_index = st->index;
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return pkt->size;
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}
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skip:
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len = FFMAX(0, len);
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avio_skip(pb, len);
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}
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}
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AVInputFormat ff_swf_demuxer = {
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.name = "swf",
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.long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
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.priv_data_size = sizeof(SWFContext),
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.read_probe = swf_probe,
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.read_header = swf_read_header,
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.read_packet = swf_read_packet,
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};
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