mov.c

ffmpeg移植到symbian的全部源代码

#define MP4DecConfigDescrTag            0x04
#define MP4DecSpecificDescrTag          0x05

static const AVCodecTag mp4_audio_types[] = {
    { CODEC_ID_MP3ON4, 29 }, /* old mp3on4 draft */
    { CODEC_ID_MP3ON4, 32 }, /* layer 1 */
    { CODEC_ID_MP3ON4, 33 }, /* layer 2 */
    { CODEC_ID_MP3ON4, 34 }, /* layer 3 */
    { CODEC_ID_NONE,    0 },
};

static int mov_read_esds(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    AVStream *st = c->fc->streams[c->fc->nb_streams-1];
    int tag, len;

    get_be32(pb); /* version + flags */
    len = mp4_read_descr(c, pb, &tag);
    if (tag == MP4ESDescrTag) {
        get_be16(pb); /* ID */
        get_byte(pb); /* priority */
    } else
        get_be16(pb); /* ID */

    len = mp4_read_descr(c, pb, &tag);
    if (tag == MP4DecConfigDescrTag) {
        int object_type_id = get_byte(pb);
        get_byte(pb); /* stream type */
        get_be24(pb); /* buffer size db */
        get_be32(pb); /* max bitrate */
        get_be32(pb); /* avg bitrate */

        st->codec->codec_id= codec_get_id(ff_mp4_obj_type, object_type_id);
        dprintf(c->fc, "esds object type id %d\n", object_type_id);
        len = mp4_read_descr(c, pb, &tag);
        if (tag == MP4DecSpecificDescrTag) {
            dprintf(c->fc, "Specific MPEG4 header len=%d\n", len);
            if((uint64_t)len > (1<<30))
                return -1;
            st->codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
            if (!st->codec->extradata)
                return AVERROR(ENOMEM);
            get_buffer(pb, st->codec->extradata, len);
            st->codec->extradata_size = len;
            if (st->codec->codec_id == CODEC_ID_AAC) {
                MPEG4AudioConfig cfg;
                ff_mpeg4audio_get_config(&cfg, st->codec->extradata,
                                         st->codec->extradata_size);
                if (cfg.chan_config > 7)
                    return -1;
                st->codec->channels = ff_mpeg4audio_channels[cfg.chan_config];
                if (cfg.object_type == 29 && cfg.sampling_index < 3) // old mp3on4
                    st->codec->sample_rate = ff_mpa_freq_tab[cfg.sampling_index];
                else
                    st->codec->sample_rate = cfg.sample_rate; // ext sample rate ?
                dprintf(c->fc, "mp4a config channels %d obj %d ext obj %d "
                        "sample rate %d ext sample rate %d\n", st->codec->channels,
                        cfg.object_type, cfg.ext_object_type,
                        cfg.sample_rate, cfg.ext_sample_rate);
                if (!(st->codec->codec_id = codec_get_id(mp4_audio_types,
                                                         cfg.object_type)))
                    st->codec->codec_id = CODEC_ID_AAC;
            }
        }
    }
    return 0;
}

/* this atom contains actual media data */
static int mov_read_mdat(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    if(atom.size == 0) /* wrong one (MP4) */
        return 0;
    c->found_mdat=1;
    return 0; /* now go for moov */
}

static int mov_read_ftyp(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    uint32_t type = get_le32(pb);

    if (type != MKTAG('q','t',' ',' '))
        c->isom = 1;
    av_log(c->fc, AV_LOG_DEBUG, "ISO: File Type Major Brand: %.4s\n",(char *)&type);
    get_be32(pb); /* minor version */
    url_fskip(pb, atom.size - 8);
    return 0;
}

/* this atom should contain all header atoms */
static int mov_read_moov(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    if (mov_read_default(c, pb, atom) < 0)
        return -1;
    /* we parsed the 'moov' atom, we can terminate the parsing as soon as we find the 'mdat' */
    /* so we don't parse the whole file if over a network */
    c->found_moov=1;
    return 0; /* now go for mdat */
}

static int mov_read_moof(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    c->fragment.moof_offset = url_ftell(pb) - 8;
    dprintf(c->fc, "moof offset %llx\n", c->fragment.moof_offset);
    return mov_read_default(c, pb, atom);
}

static int mov_read_mdhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    AVStream *st = c->fc->streams[c->fc->nb_streams-1];
    MOVStreamContext *sc = st->priv_data;
    int version = get_byte(pb);
    int lang;

    if (version > 1)
        return -1; /* unsupported */

    get_be24(pb); /* flags */
    if (version == 1) {
        get_be64(pb);
        get_be64(pb);
    } else {
        get_be32(pb); /* creation time */
        get_be32(pb); /* modification time */
    }

    sc->time_scale = get_be32(pb);
    st->duration = (version == 1) ? get_be64(pb) : get_be32(pb); /* duration */

    lang = get_be16(pb); /* language */
    ff_mov_lang_to_iso639(lang, st->language);
    get_be16(pb); /* quality */

    return 0;
}

static int mov_read_mvhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    int version = get_byte(pb); /* version */
    get_be24(pb); /* flags */

    if (version == 1) {
        get_be64(pb);
        get_be64(pb);
    } else {
        get_be32(pb); /* creation time */
        get_be32(pb); /* modification time */
    }
    c->time_scale = get_be32(pb); /* time scale */

    dprintf(c->fc, "time scale = %i\n", c->time_scale);

    c->duration = (version == 1) ? get_be64(pb) : get_be32(pb); /* duration */
    get_be32(pb); /* preferred scale */

    get_be16(pb); /* preferred volume */

    url_fskip(pb, 10); /* reserved */

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

    get_be32(pb); /* preview time */
    get_be32(pb); /* preview duration */
    get_be32(pb); /* poster time */
    get_be32(pb); /* selection time */
    get_be32(pb); /* selection duration */
    get_be32(pb); /* current time */
    get_be32(pb); /* next track ID */

    return 0;
}

static int mov_read_smi(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    AVStream *st = c->fc->streams[c->fc->nb_streams-1];

    if((uint64_t)atom.size > (1<<30))
        return -1;

    // currently SVQ3 decoder expect full STSD header - so let's fake it
    // this should be fixed and just SMI header should be passed
    av_free(st->codec->extradata);
    st->codec->extradata = av_mallocz(atom.size + 0x5a + FF_INPUT_BUFFER_PADDING_SIZE);
    if (!st->codec->extradata)
        return AVERROR(ENOMEM);
    st->codec->extradata_size = 0x5a + atom.size;
    memcpy(st->codec->extradata, "SVQ3", 4); // fake
    get_buffer(pb, st->codec->extradata + 0x5a, atom.size);
    dprintf(c->fc, "Reading SMI %"PRId64"  %s\n", atom.size, st->codec->extradata + 0x5a);
    return 0;
}

static int mov_read_enda(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    AVStream *st = c->fc->streams[c->fc->nb_streams-1];
    int little_endian = get_be16(pb);

    if (little_endian) {
        switch (st->codec->codec_id) {
        case CODEC_ID_PCM_S24BE:
            st->codec->codec_id = CODEC_ID_PCM_S24LE;
            break;
        case CODEC_ID_PCM_S32BE:
            st->codec->codec_id = CODEC_ID_PCM_S32LE;
            break;
        default:
            break;
        }
    }
    return 0;
}

/* FIXME modify qdm2/svq3/h264 decoders to take full atom as extradata */
static int mov_read_extradata(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    AVStream *st = c->fc->streams[c->fc->nb_streams-1];
    uint64_t size= (uint64_t)st->codec->extradata_size + atom.size + 8 + FF_INPUT_BUFFER_PADDING_SIZE;
    uint8_t *buf;
    if(size > INT_MAX || (uint64_t)atom.size > INT_MAX)
        return -1;
    buf= av_realloc(st->codec->extradata, size);
    if(!buf)
        return -1;
    st->codec->extradata= buf;
    buf+= st->codec->extradata_size;
    st->codec->extradata_size= size - FF_INPUT_BUFFER_PADDING_SIZE;
    AV_WB32(       buf    , atom.size + 8);
    AV_WL32(       buf + 4, atom.type);
    get_buffer(pb, buf + 8, atom.size);
    return 0;
}

static int mov_read_wave(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    AVStream *st = c->fc->streams[c->fc->nb_streams-1];

    if((uint64_t)atom.size > (1<<30))
        return -1;

    if (st->codec->codec_id == CODEC_ID_QDM2) {
        // pass all frma atom to codec, needed at least for QDM2
        av_free(st->codec->extradata);
        st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);
        if (!st->codec->extradata)
            return AVERROR(ENOMEM);
        st->codec->extradata_size = atom.size;
        get_buffer(pb, st->codec->extradata, atom.size);
    } else if (atom.size > 8) { /* to read frma, esds atoms */
        if (mov_read_default(c, pb, atom) < 0)
            return -1;
    } else
        url_fskip(pb, atom.size);
    return 0;
}

/**
 * This function reads atom content and puts data in extradata without tag
 * nor size unlike mov_read_extradata.
 */
static int mov_read_glbl(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
    AVStream *st = c->fc->streams[c->fc->nb_streams-1];

    if((uint64_t)atom.size > (1<<30))
        return -1;

    av_free(st->codec->extradata);
    st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);
    if (!st->codec->extradata)
        return AVERROR(ENOMEM);
    st->codec->extradata_size = atom.size;
    get_buffer(pb, st->codec->extradata, atom.size);
    return 0;
}

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

    get_byte(pb); /* version */
    get_be24(pb); /* flags */

    entries = get_be32(pb);

    if(entries >= UINT_MAX/sizeof(int64_t))
        return -1;

    sc->chunk_count = entries;
    sc->chunk_offsets = av_malloc(entries * sizeof(int64_t));
    if (!sc->chunk_offsets)
        return -1;
    if      (atom.type == MKTAG('s','t','c','o'))
        for(i=0; i<entries; i++)
            sc->chunk_offsets[i] = get_be32(pb);
    else if (atom.type == MKTAG('c','o','6','4'))
        for(i=0; i<entries; i++)
            sc->chunk_offsets[i] = get_be64(pb);
    else
        return -1;

    return 0;
}

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

    get_byte(pb); /* version */
    get_be24(pb); /* flags */

    entries = get_be32(pb);

    for(pseudo_stream_id=0; pseudo_stream_id<entries; pseudo_stream_id++) {
        //Parsing Sample description table
        enum CodecID id;
        int dref_id;
        MOV_atom_t a = { 0, 0, 0 };
        offset_t start_pos = url_ftell(pb);
        int size = get_be32(pb); /* size */
        uint32_t format = get_le32(pb); /* data format */

        get_be32(pb); /* reserved */
        get_be16(pb); /* reserved */
        dref_id = get_be16(pb);

        if (st->codec->codec_tag &&
            st->codec->codec_tag != format &&
            (c->fc->video_codec_id ? codec_get_id(codec_movvideo_tags, format) != c->fc->video_codec_id
                                   : st->codec->codec_tag != MKTAG('j','p','e','g'))
           ){
            /* Multiple fourcc, we skip JPEG. This is not correct, we should
             * export it as a separate AVStream but this needs a few changes
             * in the MOV demuxer, patch welcome. */
            av_log(c->fc, AV_LOG_WARNING, "multiple fourcc not supported\n");
            url_fskip(pb, size - (url_ftell(pb) - start_pos));
            continue;
        }
        sc->pseudo_stream_id = st->codec->codec_tag ? -1 : pseudo_stream_id;
        sc->dref_id= dref_id;

        st->codec->codec_tag = format;
        id = codec_get_id(codec_movaudio_tags, format);
        if (id<=0 && (format&0xFFFF) == 'm'+('s'<<8))
            id = codec_get_id(codec_wav_tags, bswap_32(format)&0xFFFF);

        if (st->codec->codec_type != CODEC_TYPE_VIDEO && id > 0) {
            st->codec->codec_type = CODEC_TYPE_AUDIO;
        } else if (st->codec->codec_type != CODEC_TYPE_AUDIO && /* do not overwrite codec type */
                   format && format != MKTAG('m','p','4','s')) { /* skip old asf mpeg4 tag */
            id = codec_get_id(codec_movvideo_tags, format);
            if (id <= 0)
                id = codec_get_id(codec_bmp_tags, format);
            if (id > 0)
                st->codec->codec_type = CODEC_TYPE_VIDEO;
            else if(st->codec->codec_type == CODEC_TYPE_DATA){
                id = codec_get_id(ff_codec_movsubtitle_tags, format);
                if(id > 0)
                    st->codec->codec_type = CODEC_TYPE_SUBTITLE;
            }
        }

        dprintf(c->fc, "size=%d 4CC= %c%c%c%c codec_type=%d\n", size,
                (format >> 0) & 0xff, (format >> 8) & 0xff, (format >> 16) & 0xff,
                (format >> 24) & 0xff, st->codec->codec_type);

        if(st->codec->codec_type==CODEC_TYPE_VIDEO) {
            uint8_t codec_name[32];
            unsigned int color_depth;
            int color_greyscale;