mirror of https://github.com/FFmpeg/FFmpeg.git
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9 changed files with 242 additions and 3 deletions
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/*
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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 "avformat.h" |
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#include "crc.h" |
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#include "xiph.h" |
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#include "bytestream.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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} 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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size = FFMIN(size, 255*255); |
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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] = 79; |
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oggstream->header[0] = av_mallocz(79); // 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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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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ogg_write_page(s, NULL, 0, oggstream->duration, i, 4); // eos
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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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}; |
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