movenc.c

F:图像处理资料264264书籍ffmpeg-0.4.9-pre1VideoStream.rar 一个视频解压缩源代码

        put_byte(pb, vals[3]);
    }
    else if (size < 0x10000000)
    {
        put_byte(pb, vals[0]);
        put_byte(pb, vals[1]);
        put_byte(pb, vals[2]);
        put_byte(pb, vals[3]);
    }
}

static int mov_write_esds_tag(ByteIOContext *pb, MOVTrack* track) // Basic
{
    int decoderSpecificInfoLen = track->vosLen ? descrLength(track->vosLen):0;
    int pos = url_ftell(pb);

    put_be32(pb, 0);               // size
    put_tag(pb, "esds");
    put_be32(pb, 0);               // Version

    // ES descriptor
    putDescr(pb, 0x03, 3 + descrLength(13 + decoderSpecificInfoLen) +
             descrLength(1));
    put_be16(pb, 0x0001);          // ID (= 1)
    put_byte(pb, 0x00);            // flags (= no flags)

    // DecoderConfig descriptor
    putDescr(pb, 0x04, 13 + decoderSpecificInfoLen);

    if(track->enc->codec_id == CODEC_ID_AAC)
        put_byte(pb, 0x40);        // Object type indication
    else if(track->enc->codec_id == CODEC_ID_MPEG4)
        put_byte(pb, 0x20);        // Object type indication (Visual 14496-2)

    if(track->enc->codec_type == CODEC_TYPE_AUDIO)
        put_byte(pb, 0x15);            // flags (= Audiostream)
    else
        put_byte(pb, 0x11);            // flags (= Visualstream)

    put_byte(pb, 0x0);             // Buffersize DB (24 bits)
    put_be16(pb, 0x0dd2);          // Buffersize DB

    // TODO: find real values for these
    put_be32(pb, 0x0002e918);     // maxbitrate
    put_be32(pb, 0x00017e6b);     // avg bitrate

    if (track->vosLen)
    {
        // DecoderSpecific info descriptor
        putDescr(pb, 0x05, track->vosLen);
        put_buffer(pb, track->vosData, track->vosLen);
    }

    // SL descriptor
    putDescr(pb, 0x06, 1);
    put_byte(pb, 0x02);
    return updateSize (pb, pos);
}

const CodecTag codec_movvideo_tags[] = {
    { CODEC_ID_SVQ1, MKTAG('S', 'V', 'Q', '1') },
    { CODEC_ID_SVQ3, MKTAG('S', 'V', 'Q', '3') },
    { CODEC_ID_MPEG4, MKTAG('m', 'p', '4', 'v') },
    { CODEC_ID_H263, MKTAG('s', '2', '6', '3') },
    { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', ' ') },
    { 0, 0 },
};

static int mov_write_video_tag(ByteIOContext *pb, MOVTrack* track)
{
    int pos = url_ftell(pb), tag;

    put_be32(pb, 0); /* size */

    tag = codec_get_tag(codec_movvideo_tags, track->enc->codec_id);
    // if no mac fcc found, try with Microsoft tags
    if (!tag)
	tag = codec_get_tag(codec_bmp_tags, track->enc->codec_id);
    if (!tag)
	put_tag(pb, "    ");
    else
	put_le32(pb, tag); // store it byteswapped

    put_be32(pb, 0); /* Reserved */
    put_be16(pb, 0); /* Reserved */
    put_be16(pb, 1); /* Data-reference index */

    put_be32(pb, 0); /* Reserved (= 02000c) */
    put_be32(pb, 0); /* Reserved ("SVis")*/
    put_be32(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved (400)*/
    put_be16(pb, track->enc->width); /* Video width */
    put_be16(pb, track->enc->height); /* Video height */
    put_be32(pb, 0x00480000); /* Reserved */
    put_be32(pb, 0x00480000); /* Reserved */
    put_be32(pb, 0); /* Data size (= 0) */
    put_be16(pb, 1); /* Frame count (= 1) */
    
    put_be32(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved */
    
    put_be16(pb, 0x18); /* Reserved */
    put_be16(pb, 0xffff); /* Reserved */
    if(track->enc->codec_id == CODEC_ID_MPEG4)
        mov_write_esds_tag(pb, track);
    else if(track->enc->codec_id == CODEC_ID_H263)
        mov_write_d263_tag(pb);
    else if(track->enc->codec_id == CODEC_ID_SVQ3)
        mov_write_svq3_tag(pb);    

    return updateSize (pb, pos);
}

static int mov_write_stsd_tag(ByteIOContext *pb, MOVTrack* track)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "stsd");
    put_be32(pb, 0); /* version & flags */
    put_be32(pb, 1); /* entry count */
    if (track->enc->codec_type == CODEC_TYPE_VIDEO)
        mov_write_video_tag(pb, track);
    else if (track->enc->codec_type == CODEC_TYPE_AUDIO)
        mov_write_audio_tag(pb, track);
    return updateSize(pb, pos);
}

/* TODO?: Currently all samples/frames seem to have same duration */
/* Time to sample atom */
static int mov_write_stts_tag(ByteIOContext *pb, MOVTrack* track)
{
    put_be32(pb, 0x18); /* size */
    put_tag(pb, "stts");
    put_be32(pb, 0); /* version & flags */
    put_be32(pb, 1); /* entry count */

    put_be32(pb, track->sampleCount); /* sample count */
    put_be32(pb, track->sampleDuration); /* sample duration */
    return 0x18;
}

static int mov_write_dref_tag(ByteIOContext *pb)
{
    put_be32(pb, 28); /* size */
    put_tag(pb, "dref");
    put_be32(pb, 0); /* version & flags */
    put_be32(pb, 1); /* entry count */

    put_be32(pb, 0xc); /* size */
    put_tag(pb, "url ");
    put_be32(pb, 1); /* version & flags */

    return 28;
}

static int mov_write_stbl_tag(ByteIOContext *pb, MOVTrack* track)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "stbl");
    mov_write_stsd_tag(pb, track);
    mov_write_stts_tag(pb, track);
    if (track->enc->codec_type == CODEC_TYPE_VIDEO &&
        track->hasKeyframes)
        mov_write_stss_tag(pb, track);
    mov_write_stsc_tag(pb, track);
    mov_write_stsz_tag(pb, track);
    mov_write_stco_tag(pb, track);
    return updateSize(pb, pos);
}

static int mov_write_dinf_tag(ByteIOContext *pb)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "dinf");
    mov_write_dref_tag(pb);
    return updateSize(pb, pos);
}

static int mov_write_smhd_tag(ByteIOContext *pb)
{
    put_be32(pb, 16); /* size */
    put_tag(pb, "smhd");
    put_be32(pb, 0); /* version & flags */
    put_be16(pb, 0); /* reserved (balance, normally = 0) */
    put_be16(pb, 0); /* reserved */
    return 16;
}

static int mov_write_vmhd_tag(ByteIOContext *pb)
{
    put_be32(pb, 0x14); /* size (always 0x14) */
    put_tag(pb, "vmhd");
    put_be32(pb, 0x01); /* version & flags */
    put_be64(pb, 0); /* reserved (graphics mode = copy) */
    return 0x14;
}

static int mov_write_hdlr_tag(ByteIOContext *pb, MOVTrack* track)
{
    char *descr, *hdlr, *hdlr_type;
    int pos = url_ftell(pb);
    
    if (!track) { /* no media --> data handler */
	hdlr = "dhlr";
	hdlr_type = "url ";
	descr = "DataHandler";
    } else {
	hdlr = (track->mode == MODE_MOV) ? "mhlr" : "\0\0\0\0";
	if (track->enc->codec_type == CODEC_TYPE_VIDEO) {
	    hdlr_type = "vide";
	    descr = "VideoHandler";
	} else {
	    hdlr_type = "soun";
	    descr = "SoundHandler";
	}
    }
    
    put_be32(pb, 0); /* size */
    put_tag(pb, "hdlr");
    put_be32(pb, 0); /* Version & flags */
    put_buffer(pb, hdlr, 4); /* handler */
    put_tag(pb, hdlr_type); /* handler type */
    put_be32(pb ,0); /* reserved */
    put_be32(pb ,0); /* reserved */
    put_be32(pb ,0); /* reserved */
    put_byte(pb, strlen(descr)); /* string counter */
    put_buffer(pb, descr, strlen(descr)); /* handler description */
    return updateSize(pb, pos);
}

static int mov_write_minf_tag(ByteIOContext *pb, MOVTrack* track)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "minf");
    if(track->enc->codec_type == CODEC_TYPE_VIDEO)
        mov_write_vmhd_tag(pb);
    else
        mov_write_smhd_tag(pb);
    if (track->mode == MODE_MOV) /* FIXME: Why do it for MODE_MOV only ? */
        mov_write_hdlr_tag(pb, NULL);
    mov_write_dinf_tag(pb);
    mov_write_stbl_tag(pb, track);
    return updateSize(pb, pos);
}

static int mov_write_mdhd_tag(ByteIOContext *pb, MOVTrack* track)
{
    put_be32(pb, 32); /* size */
    put_tag(pb, "mdhd");
    put_be32(pb, 0); /* Version & flags */
    put_be32(pb, track->time); /* creation time */
    put_be32(pb, track->time); /* modification time */
    put_be32(pb, track->timescale); /* time scale (sample rate for audio) */ 
    put_be32(pb, track->trackDuration); /* duration */
    put_be16(pb, 0); /* language, 0 = english */
    put_be16(pb, 0); /* reserved (quality) */
    return 32;
}

static int mov_write_mdia_tag(ByteIOContext *pb, MOVTrack* track)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "mdia");
    mov_write_mdhd_tag(pb, track);
    mov_write_hdlr_tag(pb, track);
    mov_write_minf_tag(pb, track);
    return updateSize(pb, pos);
}

static int mov_write_tkhd_tag(ByteIOContext *pb, MOVTrack* track)
{
    int64_t maxTrackLenTemp;
    put_be32(pb, 0x5c); /* size (always 0x5c) */
    put_tag(pb, "tkhd");
    put_be32(pb, 0xf); /* version & flags (track enabled) */
    put_be32(pb, track->time); /* creation time */
    put_be32(pb, track->time); /* modification time */
    put_be32(pb, track->trackID); /* track-id */
    put_be32(pb, 0); /* reserved */
    maxTrackLenTemp = ((int64_t)globalTimescale*(int64_t)track->trackDuration)/(int64_t)track->timescale;
    put_be32(pb, (long)maxTrackLenTemp); /* duration */

    put_be32(pb, 0); /* reserved */
    put_be32(pb, 0); /* reserved */
    put_be32(pb, 0x0); /* reserved (Layer & Alternate group) */
    /* Volume, only for audio */
    if(track->enc->codec_type == CODEC_TYPE_AUDIO)
        put_be16(pb, 0x0100);
    else
        put_be16(pb, 0);
    put_be16(pb, 0); /* reserved */

    /* Matrix structure */
    put_be32(pb, 0x00010000); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x00010000); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x40000000); /* reserved */

    /* Track width and height, for visual only */
    if(track->enc->codec_type == CODEC_TYPE_VIDEO) {
        double sample_aspect_ratio = av_q2d(track->enc->sample_aspect_ratio);
        if( !sample_aspect_ratio ) sample_aspect_ratio = 1;
        put_be32(pb, sample_aspect_ratio * track->enc->width*0x10000);
        put_be32(pb, track->enc->height*0x10000);
    }
    else {
        put_be32(pb, 0);
        put_be32(pb, 0);
    }
    return 0x5c;
}

static int mov_write_trak_tag(ByteIOContext *pb, MOVTrack* track)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "trak");
    mov_write_tkhd_tag(pb, track);
    mov_write_mdia_tag(pb, track);
    return updateSize(pb, pos);
}

/* TODO: Not sorted out, but not necessary either */
static int mov_write_iods_tag(ByteIOContext *pb, MOVContext *mov)
{
    put_be32(pb, 0x15); /* size */
    put_tag(pb, "iods");
    put_be32(pb, 0);    /* version & flags */
    put_be16(pb, 0x1007);
    put_byte(pb, 0);
    put_be16(pb, 0x4fff);
    put_be16(pb, 0xfffe);
    put_be16(pb, 0x01ff);
    return 0x15;
}

static int mov_write_mvhd_tag(ByteIOContext *pb, MOVContext *mov)
{
    int maxTrackID = 1, maxTrackLen = 0, i;
    int64_t maxTrackLenTemp;

    put_be32(pb, 0x6c); /* size (always 0x6c) */
    put_tag(pb, "mvhd");
    put_be32(pb, 0); /* version & flags */
    put_be32(pb, mov->time); /* creation time */
    put_be32(pb, mov->time); /* modification time */
    put_be32(pb, mov->timescale); /* timescale */
    for (i=0; i<MAX_STREAMS; i++) {
        if(mov->tracks[i].entry > 0) {
            maxTrackLenTemp = ((int64_t)globalTimescale*(int64_t)mov->tracks[i].trackDuration)/(int64_t)mov->tracks[i].timescale;
            if(maxTrackLen < maxTrackLenTemp)
                maxTrackLen = maxTrackLenTemp;
            if(maxTrackID < mov->tracks[i].trackID)
                maxTrackID = mov->tracks[i].trackID;
        }
    }
    put_be32(pb, maxTrackLen); /* duration of longest track */

    put_be32(pb, 0x00010000); /* reserved (preferred rate) 1.0 = normal */