mov.c

pmpmodavc102_sub_src,psp下很好的播放器源码

                get_be16(pb); /* compression id = 0*/
                get_be16(pb); /* packet size = 0 */

                st->codec->sample_rate = ((get_be32(pb) >> 16));
	        //av_log(NULL, AV_LOG_DEBUG, "CODECID %d  %d  %.4s\n", st->codec->codec_id, CODEC_ID_PCM_S16BE, (char*)&format);

	        switch (st->codec->codec_id) {
	        case CODEC_ID_PCM_S16BE:
		    if (st->codec->bits_per_sample == 8)
		        st->codec->codec_id = CODEC_ID_PCM_S8;
                    /* fall */
	        case CODEC_ID_PCM_U8:
		    st->codec->bit_rate = st->codec->sample_rate * 8;
		    break;
	        default:
                    ;
	        }

                //Read QT version 1 fields. In version 0 theese dont exist
#ifdef DEBUG
                av_log(NULL, AV_LOG_DEBUG, "version =%d mp4=%d\n",version,c->mp4);
                av_log(NULL, AV_LOG_DEBUG, "size-(16+20+16)=%d\n",size-(16+20+16));
#endif
                if((version==1) && size>=(16+20+16))
                {
                    get_be32(pb); /* samples per packet */
                    get_be32(pb); /* bytes per packet */
                    get_be32(pb); /* bytes per frame */
                    get_be32(pb); /* bytes per sample */
                    if(size>(16+20+16))
                    {
                        //Optional, additional atom-based fields
                        MOV_atom_t a = { format, url_ftell(pb), size - (16 + 20 + 16 + 8) };
#ifdef DEBUG
                        av_log(NULL, AV_LOG_DEBUG, "offest=0x%X, sizeleft=%d=0x%x,format=%c%c%c%c\n",(int)url_ftell(pb),size - (16 + 20 + 16 ),size - (16 + 20 + 16 ),
                            (format >> 0) & 0xff,
                            (format >> 8) & 0xff,
                            (format >> 16) & 0xff,
                            (format >> 24) & 0xff);
#endif
                        mov_read_default(c, pb, a);
                    }
                }
                else
                {
                    //We should be down to 0 bytes here, but lets make sure.
                    size-=(16+20);
#ifdef DEBUG
                    if(size>0)
                        av_log(NULL, AV_LOG_DEBUG, "skipping 0x%X bytes\n",size-(16+20));
#endif
                    url_fskip(pb, size);
                }
            }
            else
            {
                size-=16;
                //Unknown size, but lets do our best and skip the rest.
#ifdef DEBUG
                av_log(NULL, AV_LOG_DEBUG, "Strange size, skipping 0x%X bytes\n",size);
#endif
                url_fskip(pb, size);
            }
        }
    }
    
    if(st->codec->codec_type==CODEC_TYPE_AUDIO && st->codec->sample_rate==0 && sc->time_scale>1) {
        st->codec->sample_rate= sc->time_scale;
    }

    return 0;
}

static int mov_read_stsc(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    AVStream *st = c->fc->streams[c->fc->nb_streams-1];
    MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;
    unsigned int i, entries;

    print_atom("stsc", atom);

    get_byte(pb); /* version */
    get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

    entries = get_be32(pb);
    
    if(entries >= UINT_MAX / sizeof(MOV_sample_to_chunk_tbl))
        return -1;
    
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);
#endif
    sc->sample_to_chunk_sz = entries;
    sc->sample_to_chunk = (MOV_sample_to_chunk_tbl*) av_malloc(entries * sizeof(MOV_sample_to_chunk_tbl));
    if (!sc->sample_to_chunk)
        return -1;
    for(i=0; i<entries; i++) {
        sc->sample_to_chunk[i].first = get_be32(pb);
        sc->sample_to_chunk[i].count = get_be32(pb);
        sc->sample_to_chunk[i].id = get_be32(pb);
#ifdef DEBUG
/*        av_log(NULL, AV_LOG_DEBUG, "sample_to_chunk first=%ld count=%ld, id=%ld\n", sc->sample_to_chunk[i].first, sc->sample_to_chunk[i].count, sc->sample_to_chunk[i].id); */
#endif
    }
    return 0;
}

static int mov_read_stss(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    AVStream *st = c->fc->streams[c->fc->nb_streams-1];
    MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;
    unsigned int i, entries;

    print_atom("stss", atom);

    get_byte(pb); /* version */
    get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

    entries = get_be32(pb);
    
    if(entries >= UINT_MAX / sizeof(long))
        return -1;
    
    sc->keyframe_count = entries;
#ifdef DEBUG
    av_log(NULL, AV_LOG_DEBUG, "keyframe_count = %ld\n", sc->keyframe_count);
#endif
    sc->keyframes = (long*) av_malloc(entries * sizeof(long));
    if (!sc->keyframes)
        return -1;
    for(i=0; i<entries; i++) {
        sc->keyframes[i] = get_be32(pb);
#ifdef DEBUG
/*        av_log(NULL, AV_LOG_DEBUG, "keyframes[]=%ld\n", sc->keyframes[i]); */
#endif
    }
    return 0;
}

static int mov_read_stsz(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    AVStream *st = c->fc->streams[c->fc->nb_streams-1];
    MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;
    unsigned int i, entries;

    print_atom("stsz", atom);

    get_byte(pb); /* version */
    get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

    sc->sample_size = get_be32(pb);
    entries = get_be32(pb);
    if(entries >= UINT_MAX / sizeof(long))
        return -1;

    sc->sample_count = entries;
#ifdef DEBUG
    av_log(NULL, AV_LOG_DEBUG, "sample_size = %ld sample_count = %ld\n", sc->sample_size, sc->sample_count);
#endif
    if(sc->sample_size)
        return 0; /* there isn't any table following */
    sc->sample_sizes = (long*) av_malloc(entries * sizeof(long));
    if (!sc->sample_sizes)
        return -1;
    for(i=0; i<entries; i++) {
        sc->sample_sizes[i] = get_be32(pb);
#ifdef DEBUG
        av_log(NULL, AV_LOG_DEBUG, "sample_sizes[]=%ld\n", sc->sample_sizes[i]);
#endif
    }
    return 0;
}

static int mov_read_stts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    AVStream *st = c->fc->streams[c->fc->nb_streams-1];
    //MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;
    unsigned int i, entries;
    int64_t duration=0;
    int64_t total_sample_count=0;

    print_atom("stts", atom);

    get_byte(pb); /* version */
    get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
    entries = get_be32(pb);
    if(entries >= UINT_MAX / sizeof(Time2Sample))
        return -1;

    c->streams[c->fc->nb_streams-1]->stts_count = entries;
    c->streams[c->fc->nb_streams-1]->stts_data = av_malloc(entries * sizeof(Time2Sample));

#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "track[%i].stts.entries = %i\n", c->fc->nb_streams-1, entries);
#endif
    for(i=0; i<entries; i++) {
        int sample_duration;
        int sample_count;

        sample_count=get_be32(pb);
        sample_duration = get_be32(pb);
        c->streams[c->fc->nb_streams - 1]->stts_data[i].count= sample_count;
        c->streams[c->fc->nb_streams - 1]->stts_data[i].duration= sample_duration;

#ifdef DEBUG
        av_log(NULL, AV_LOG_DEBUG, "sample_count=%d, sample_duration=%d\n",sample_count,sample_duration);
#endif
        duration+=sample_duration*sample_count;
        total_sample_count+=sample_count;
    }

    st->nb_frames= total_sample_count;
    if(duration)
        st->duration= duration;
    return 0;
}

static int mov_read_ctts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
//    AVStream *st = c->fc->streams[c->fc->nb_streams-1];
    //MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;
    unsigned int i, entries;

    print_atom("ctts", atom);

    get_byte(pb); /* version */
    get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
    entries = get_be32(pb);
    if(entries >= UINT_MAX / sizeof(Time2Sample))
        return -1;

    c->streams[c->fc->nb_streams-1]->ctts_count = entries;
    c->streams[c->fc->nb_streams-1]->ctts_data = av_malloc(entries * sizeof(Time2Sample));

// #ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);
// #endif
    for(i=0; i<entries; i++) {
        c->streams[c->fc->nb_streams - 1]->ctts_data[i].count= get_be32(pb);
        c->streams[c->fc->nb_streams - 1]->ctts_data[i].duration= get_be32(pb);
    }
    return 0;
}

static int mov_read_trak(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    AVStream *st;
    MOVStreamContext *sc;

    print_atom("trak", atom);

    st = av_new_stream(c->fc, c->fc->nb_streams);
    if (!st) return -2;
    sc = (MOVStreamContext*) av_mallocz(sizeof(MOVStreamContext));
    if (!sc) {
	av_free(st);
        return -1;
    }

    sc->sample_to_chunk_index = -1;
    st->priv_data = sc;
    st->codec->codec_type = CODEC_TYPE_MOV_OTHER;
    st->start_time = 0; /* XXX: check */
    c->streams[c->fc->nb_streams-1] = sc;

    return mov_read_default(c, pb, atom);
}

static int mov_read_tkhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    AVStream *st;

    print_atom("tkhd", atom);

    st = c->fc->streams[c->fc->nb_streams-1];

    get_byte(pb); /* version */

    get_byte(pb); get_byte(pb);
    get_byte(pb); /* flags */
    /*
    MOV_TRACK_ENABLED 0x0001
    MOV_TRACK_IN_MOVIE 0x0002
    MOV_TRACK_IN_PREVIEW 0x0004
    MOV_TRACK_IN_POSTER 0x0008
    */

    get_be32(pb); /* creation time */
    get_be32(pb); /* modification time */
    st->id = (int)get_be32(pb); /* track id (NOT 0 !)*/
    get_be32(pb); /* reserved */
    st->start_time = 0; /* check */
    get_be32(pb); /* highlevel (considering edits) duration in movie timebase */
    get_be32(pb); /* reserved */
    get_be32(pb); /* reserved */

    get_be16(pb); /* layer */
    get_be16(pb); /* alternate group */
    get_be16(pb); /* volume */
    get_be16(pb); /* reserved */

    url_fskip(pb, 36); /* display matrix */

    /* those are fixed-point */
    /*st->codec->width =*/ get_be32(pb) >> 16; /* track width */
    /*st->codec->height =*/ get_be32(pb) >> 16; /* track height */

    return 0;
}

/* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */
/* like the files created with Adobe Premiere 5.0, for samples see */
/* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */
static int mov_read_wide(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    int err;

#ifdef DEBUG
    print_atom("wide", atom);
    debug_indent++;
#endif
    if (atom.size < 8)
        return 0; /* continue */
    if (get_be32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */
        url_fskip(pb, atom.size - 4);
        return 0;
    }
    atom.type = get_le32(pb);
    atom.offset += 8;
    atom.size -= 8;
    if (atom.type != MKTAG('m', 'd', 'a', 't')) {
        url_fskip(pb, atom.size);
        return 0;
    }
    err = mov_read_mdat(c, pb, atom);
#ifdef DEBUG
    debug_indent--;
#endif
    return err;
}


#ifdef CONFIG_ZLIB
static int null_read_packet(void *opaque, uint8_t *buf, int buf_size)
{
    return -1;
}

static int mov_read_cmov(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    ByteIOContext ctx;
    uint8_t *cmov_data;
    uint8_t *moov_data; /* uncompressed data */
    long cmov_len, moov_len;
    int ret;

    print_atom("cmov", atom);

    get_be32(pb); /* dcom atom */
    if (get_le32(pb) != MKTAG( 'd', 'c', 'o', 'm' ))
        return -1;
    if (get_le32(pb) != MKTAG( 'z', 'l', 'i', 'b' )) {
        av_log(NULL, AV_LOG_DEBUG, "unknown compression for cmov atom !");
        return -1;
    }
    get_be32(pb); /* cmvd atom */
    if (get_le32(pb) != MKTAG( 'c', 'm', 'v', 'd' ))
        return -1;
    moov_len = get_be32(pb); /* uncompressed size */
    cmov_len = atom.size - 6 * 4;

    cmov_data = (uint8_t *) av_malloc(cmov_len);
    if (!cmov_data)
        return -1;
    moov_data = (uint8_t *) av_malloc(moov_len);
    if (!moov_data) {
        av_free(cmov_data);
        return -1;
    }