293 lines
10 KiB
C
293 lines
10 KiB
C
/*
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* Ogg muxer
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* Copyright (c) 2007 Baptiste Coudurier <baptiste dot coudurier at free dot fr>
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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 "libavutil/crc.h"
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#include "libavcodec/xiph.h"
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#include "libavcodec/bytestream.h"
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#include "avformat.h"
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typedef struct {
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int64_t duration;
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unsigned page_counter;
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uint8_t *header[3];
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int header_len[3];
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/** for theora granule */
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int kfgshift;
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int64_t last_kf_pts;
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int vrev;
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int eos;
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} OGGStreamContext;
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static void ogg_update_checksum(AVFormatContext *s, offset_t crc_offset)
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{
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offset_t pos = url_ftell(s->pb);
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uint32_t checksum = get_checksum(s->pb);
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url_fseek(s->pb, crc_offset, SEEK_SET);
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put_be32(s->pb, checksum);
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url_fseek(s->pb, pos, SEEK_SET);
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}
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static int ogg_write_page(AVFormatContext *s, const uint8_t *data, int size,
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int64_t granule, int stream_index, int flags)
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{
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OGGStreamContext *oggstream = s->streams[stream_index]->priv_data;
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offset_t crc_offset;
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int page_segments, i;
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if (size >= 255*255) {
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granule = -1;
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size = 255*255;
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} else if (oggstream->eos)
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flags |= 4;
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page_segments = FFMIN((size/255)+!!size, 255);
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init_checksum(s->pb, ff_crc04C11DB7_update, 0);
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put_tag(s->pb, "OggS");
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put_byte(s->pb, 0);
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put_byte(s->pb, flags);
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put_le64(s->pb, granule);
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put_le32(s->pb, stream_index);
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put_le32(s->pb, oggstream->page_counter++);
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crc_offset = url_ftell(s->pb);
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put_le32(s->pb, 0); // crc
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put_byte(s->pb, page_segments);
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for (i = 0; i < page_segments-1; i++)
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put_byte(s->pb, 255);
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if (size) {
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put_byte(s->pb, size - (page_segments-1)*255);
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put_buffer(s->pb, data, size);
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}
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ogg_update_checksum(s, crc_offset);
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put_flush_packet(s->pb);
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return size;
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}
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static int ogg_build_flac_headers(const uint8_t *extradata, int extradata_size,
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OGGStreamContext *oggstream, int bitexact)
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{
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const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
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uint8_t *p;
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if (extradata_size != 34)
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return -1;
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oggstream->header_len[0] = 51;
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oggstream->header[0] = av_mallocz(51); // per ogg flac specs
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p = oggstream->header[0];
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bytestream_put_byte(&p, 0x7F);
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bytestream_put_buffer(&p, "FLAC", 4);
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bytestream_put_byte(&p, 1); // major version
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bytestream_put_byte(&p, 0); // minor version
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bytestream_put_be16(&p, 1); // headers packets without this one
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bytestream_put_buffer(&p, "fLaC", 4);
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bytestream_put_byte(&p, 0x00); // streaminfo
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bytestream_put_be24(&p, 34);
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bytestream_put_buffer(&p, extradata, 34);
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oggstream->header_len[1] = 1+3+4+strlen(vendor)+4;
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oggstream->header[1] = av_mallocz(oggstream->header_len[1]);
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p = oggstream->header[1];
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bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
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bytestream_put_be24(&p, oggstream->header_len[1] - 4);
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bytestream_put_le32(&p, strlen(vendor));
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bytestream_put_buffer(&p, vendor, strlen(vendor));
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bytestream_put_le32(&p, 0); // user comment list length
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return 0;
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}
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static int ogg_write_header(AVFormatContext *s)
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{
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OGGStreamContext *oggstream;
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int i, 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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if (st->codec->codec_type == CODEC_TYPE_AUDIO)
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av_set_pts_info(st, 64, 1, st->codec->sample_rate);
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else if (st->codec->codec_type == CODEC_TYPE_VIDEO)
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av_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
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if (st->codec->codec_id != CODEC_ID_VORBIS &&
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st->codec->codec_id != CODEC_ID_THEORA &&
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st->codec->codec_id != CODEC_ID_FLAC) {
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av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
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return -1;
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}
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if (!st->codec->extradata || !st->codec->extradata_size) {
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av_log(s, AV_LOG_ERROR, "No extradata present\n");
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return -1;
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}
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oggstream = av_mallocz(sizeof(*oggstream));
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st->priv_data = oggstream;
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if (st->codec->codec_id == CODEC_ID_FLAC) {
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if (ogg_build_flac_headers(st->codec->extradata, st->codec->extradata_size,
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oggstream, st->codec->flags & CODEC_FLAG_BITEXACT) < 0) {
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av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
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av_freep(&st->priv_data);
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}
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} else {
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if (ff_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
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st->codec->codec_id == CODEC_ID_VORBIS ? 30 : 42,
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oggstream->header, oggstream->header_len) < 0) {
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av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
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av_freep(&st->priv_data);
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return -1;
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}
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if (st->codec->codec_id == CODEC_ID_THEORA) {
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/** KFGSHIFT is the width of the less significant section of the granule position
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The less significant section is the frame count since the last keyframe */
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oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
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oggstream->vrev = oggstream->header[0][9];
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av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
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oggstream->kfgshift, oggstream->vrev);
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}
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}
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}
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for (i = 0; i < 3; i++) {
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for (j = 0; j < s->nb_streams; j++) {
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AVStream *st = s->streams[j];
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OGGStreamContext *oggstream = st->priv_data;
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if (oggstream && oggstream->header_len[i]) {
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ogg_write_page(s, oggstream->header[i], oggstream->header_len[i],
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0, st->index, i ? 0 : 2); // bos
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}
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}
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}
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return 0;
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}
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static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVStream *st = s->streams[pkt->stream_index];
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OGGStreamContext *oggstream = st->priv_data;
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uint8_t *ptr = pkt->data;
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int ret, size = pkt->size;
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int64_t granule;
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if (st->codec->codec_id == CODEC_ID_THEORA) {
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int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
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int pframe_count;
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if (pkt->flags & PKT_FLAG_KEY)
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oggstream->last_kf_pts = pts;
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pframe_count = pts - oggstream->last_kf_pts;
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// prevent frame count from overflow if key frame flag is not set
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if (pframe_count >= (1<<oggstream->kfgshift)) {
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oggstream->last_kf_pts += pframe_count;
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pframe_count = 0;
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}
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granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
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} else
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granule = pkt->pts + pkt->duration;
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oggstream->duration = granule;
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do {
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ret = ogg_write_page(s, ptr, size, granule, pkt->stream_index, ptr != pkt->data);
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ptr += ret; size -= ret;
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} while (size > 0 || ret == 255*255); // need to output a last nil page
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return 0;
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}
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int ogg_interleave_per_granule(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
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{
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AVPacketList *pktl, **next_point, *this_pktl;
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int stream_count = 0;
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int streams[MAX_STREAMS] = {0};
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int interleaved = 0;
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if (pkt) {
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AVStream *st = s->streams[pkt->stream_index];
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this_pktl = av_mallocz(sizeof(AVPacketList));
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this_pktl->pkt = *pkt;
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if (pkt->destruct == av_destruct_packet)
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pkt->destruct = NULL; // not shared -> must keep original from being freed
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else
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av_dup_packet(&this_pktl->pkt); // shared -> must dup
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next_point = &s->packet_buffer;
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while (*next_point) {
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AVStream *st2 = s->streams[(*next_point)->pkt.stream_index];
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AVPacket *next_pkt = &(*next_point)->pkt;
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int64_t cur_granule, next_granule;
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next_granule = av_rescale_q(next_pkt->pts + next_pkt->duration,
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st2->time_base, AV_TIME_BASE_Q);
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cur_granule = av_rescale_q(pkt->pts + pkt->duration,
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st->time_base, AV_TIME_BASE_Q);
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if (next_granule > cur_granule)
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break;
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next_point= &(*next_point)->next;
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}
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this_pktl->next= *next_point;
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*next_point= this_pktl;
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}
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pktl = s->packet_buffer;
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while (pktl) {
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if (streams[pktl->pkt.stream_index] == 0)
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stream_count++;
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streams[pktl->pkt.stream_index]++;
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// need to buffer at least one packet to set eos flag
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if (streams[pktl->pkt.stream_index] == 2)
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interleaved++;
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pktl = pktl->next;
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}
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if ((s->nb_streams == stream_count && interleaved == stream_count) ||
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(flush && stream_count)) {
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pktl= s->packet_buffer;
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*out= pktl->pkt;
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s->packet_buffer = pktl->next;
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if (flush && streams[out->stream_index] == 1) {
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OGGStreamContext *ogg = s->streams[out->stream_index]->priv_data;
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ogg->eos = 1;
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}
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av_freep(&pktl);
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return 1;
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} else {
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av_init_packet(out);
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return 0;
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}
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}
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static int ogg_write_trailer(AVFormatContext *s)
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{
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int i;
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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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OGGStreamContext *oggstream = st->priv_data;
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if (st->codec->codec_id == CODEC_ID_FLAC) {
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av_free(oggstream->header[0]);
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av_free(oggstream->header[1]);
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}
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av_freep(&st->priv_data);
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}
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return 0;
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}
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AVOutputFormat ogg_muxer = {
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"ogg",
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"Ogg format",
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"application/ogg",
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"ogg",
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0,
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CODEC_ID_FLAC,
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CODEC_ID_THEORA,
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ogg_write_header,
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ogg_write_packet,
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ogg_write_trailer,
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.interleave_packet = ogg_interleave_per_granule,
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};
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