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ffmpeg / libavformat / oggparseogm.c @ 9106a698

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/**
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    Copyright (C) 2005  Michael Ahlberg, Måns Rullgård
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    Permission is hereby granted, free of charge, to any person
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    obtaining a copy of this software and associated documentation
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    files (the "Software"), to deal in the Software without
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    restriction, including without limitation the rights to use, copy,
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    modify, merge, publish, distribute, sublicense, and/or sell copies
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    of the Software, and to permit persons to whom the Software is
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    furnished to do so, subject to the following conditions:
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    The above copyright notice and this permission notice shall be
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    included in all copies or substantial portions of the Software.
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    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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    HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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    DEALINGS IN THE SOFTWARE.
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**/
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#include <stdlib.h>
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#include "libavutil/intreadwrite.h"
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#include "libavcodec/get_bits.h"
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#include "libavcodec/bytestream.h"
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#include "avformat.h"
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#include "oggdec.h"
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#include "riff.h"
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static int
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ogm_header(AVFormatContext *s, int idx)
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{
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    struct ogg *ogg = s->priv_data;
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    struct ogg_stream *os = ogg->streams + idx;
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    AVStream *st = s->streams[idx];
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    const uint8_t *p = os->buf + os->pstart;
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    uint64_t time_unit;
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    uint64_t spu;
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    uint32_t default_len;
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    if(!(*p & 1))
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        return 0;
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    if(*p != 1)
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        return 1;
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    p++;
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    if(*p == 'v'){
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        int tag;
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        st->codec->codec_type = CODEC_TYPE_VIDEO;
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        p += 8;
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        tag = bytestream_get_le32(&p);
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        st->codec->codec_id = codec_get_id(codec_bmp_tags, tag);
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        st->codec->codec_tag = tag;
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    } else if (*p == 't') {
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        st->codec->codec_type = CODEC_TYPE_SUBTITLE;
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        st->codec->codec_id = CODEC_ID_TEXT;
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        p += 12;
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    } else {
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        uint8_t acid[5];
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        int cid;
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        st->codec->codec_type = CODEC_TYPE_AUDIO;
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        p += 8;
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        bytestream_get_buffer(&p, acid, 4);
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        acid[4] = 0;
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        cid = strtol(acid, NULL, 16);
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        st->codec->codec_id = codec_get_id(codec_wav_tags, cid);
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        st->need_parsing = AVSTREAM_PARSE_FULL;
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    }
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    p += 4;                     /* useless size field */
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    time_unit   = bytestream_get_le64(&p);
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    spu         = bytestream_get_le64(&p);
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    default_len = bytestream_get_le32(&p);
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    p += 8;                     /* buffersize + bits_per_sample */
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    if(st->codec->codec_type == CODEC_TYPE_VIDEO){
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        st->codec->width = bytestream_get_le32(&p);
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        st->codec->height = bytestream_get_le32(&p);
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        st->codec->time_base.den = spu * 10000000;
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        st->codec->time_base.num = time_unit;
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        st->time_base = st->codec->time_base;
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    } else {
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        st->codec->channels = bytestream_get_le16(&p);
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        p += 2;                 /* block_align */
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        st->codec->bit_rate = bytestream_get_le32(&p) * 8;
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        st->codec->sample_rate = spu * 10000000 / time_unit;
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        st->time_base.num = 1;
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        st->time_base.den = st->codec->sample_rate;
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    }
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    return 1;
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}
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static int
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ogm_dshow_header(AVFormatContext *s, int idx)
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{
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    struct ogg *ogg = s->priv_data;
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    struct ogg_stream *os = ogg->streams + idx;
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    AVStream *st = s->streams[idx];
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    uint8_t *p = os->buf + os->pstart;
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    uint32_t t;
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    if(!(*p & 1))
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        return 0;
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    if(*p != 1)
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        return 1;
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    t = AV_RL32(p + 96);
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    if(t == 0x05589f80){
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        st->codec->codec_type = CODEC_TYPE_VIDEO;
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        st->codec->codec_id = codec_get_id(codec_bmp_tags, AV_RL32(p + 68));
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        st->codec->time_base.den = 10000000;
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        st->codec->time_base.num = AV_RL64(p + 164);
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        st->codec->width = AV_RL32(p + 176);
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        st->codec->height = AV_RL32(p + 180);
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    } else if(t == 0x05589f81){
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        st->codec->codec_type = CODEC_TYPE_AUDIO;
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        st->codec->codec_id = codec_get_id(codec_wav_tags, AV_RL16(p + 124));
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        st->codec->channels = AV_RL16(p + 126);
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        st->codec->sample_rate = AV_RL32(p + 128);
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        st->codec->bit_rate = AV_RL32(p + 132) * 8;
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    }
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    return 1;
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}
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static int
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ogm_packet(AVFormatContext *s, int idx)
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{
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    struct ogg *ogg = s->priv_data;
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    struct ogg_stream *os = ogg->streams + idx;
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    uint8_t *p = os->buf + os->pstart;
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    int lb;
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    if(*p & 8)
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        os->pflags |= PKT_FLAG_KEY;
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    lb = ((*p & 2) << 1) | ((*p >> 6) & 3);
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    os->pstart += lb + 1;
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    os->psize -= lb + 1;
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    return 0;
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}
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const struct ogg_codec ff_ogm_video_codec = {
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    .magic = "\001video",
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    .magicsize = 6,
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    .header = ogm_header,
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    .packet = ogm_packet
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};
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const struct ogg_codec ff_ogm_audio_codec = {
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    .magic = "\001audio",
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    .magicsize = 6,
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    .header = ogm_header,
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    .packet = ogm_packet
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};
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const struct ogg_codec ff_ogm_text_codec = {
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    .magic = "\001text",
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    .magicsize = 5,
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    .header = ogm_header,
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    .packet = ogm_packet
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};
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const struct ogg_codec ff_ogm_old_codec = {
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    .magic = "\001Direct Show Samples embedded in Ogg",
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    .magicsize = 35,
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    .header = ogm_dshow_header,
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    .packet = ogm_packet
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};