movenc.c 39.6 KB
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/*
 * MOV, 3GP, MP4 encoder.
 * Copyright (c) 2003 Thomas Raivio.
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 * Copyright (c) 2004 Gildas Bazin <gbazin at videolan dot org>.
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 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include "avformat.h"
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#include "avi.h"
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#include "avio.h"

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#undef NDEBUG
#include <assert.h>

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#define MOV_INDEX_CLUSTER_SIZE 16384
#define globalTimescale 1000

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#define MODE_MP4 0
#define MODE_MOV 1
#define MODE_3GP 2

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typedef struct MOVIentry {
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    unsigned int flags, pos, size;
    unsigned int samplesInChunk;
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    char         key_frame;
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    unsigned int entries;
} MOVIentry;

typedef struct MOVIndex {
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    int         mode;
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    int         entry;
    int         mdat_size;
    int         ents_allocated;
    long        timescale;
    long        time;
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    long        trackDuration;
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    long        sampleCount;
    long        sampleDuration;
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    int         hasKeyframes;
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    int         trackID;
    AVCodecContext *enc;

    int         vosLen;
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    uint8_t     *vosData;
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    MOVIentry** cluster;
} MOVTrack;

typedef struct {
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    int     mode;
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    long    time;
    int     nb_streams;
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    int     mdat_written;
    offset_t mdat_pos;
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    long    timescale;
    MOVTrack tracks[MAX_STREAMS];
} MOVContext;

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static int mov_write_esds_tag(ByteIOContext *pb, MOVTrack* track);

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//FIXME supprt 64bit varaint with wide placeholders
static int updateSize (ByteIOContext *pb, int pos)
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{
    long curpos = url_ftell(pb);
    url_fseek(pb, pos, SEEK_SET);
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    put_be32(pb, curpos - pos); /* rewrite size */
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    url_fseek(pb, curpos, SEEK_SET);
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    return curpos - pos;
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}

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/* Chunk offset atom */
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static int mov_write_stco_tag(ByteIOContext *pb, MOVTrack* track)
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{
    int i;
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    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
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    put_tag(pb, "stco");
    put_be32(pb, 0); /* version & flags */
    put_be32(pb, track->entry); /* entry count */
    for (i=0; i<track->entry; i++) {
        int cl = i / MOV_INDEX_CLUSTER_SIZE;
        int id = i % MOV_INDEX_CLUSTER_SIZE;
        put_be32(pb, track->cluster[cl][id].pos);
    }
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    return updateSize (pb, pos);
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}

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/* Sample size atom */
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static int mov_write_stsz_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    int equalChunks = 1;
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    int i, j, entries = 0, tst = -1, oldtst = -1;
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    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
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    put_tag(pb, "stsz");
    put_be32(pb, 0); /* version & flags */

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    for (i=0; i<track->entry; i++) {
        int cl = i / MOV_INDEX_CLUSTER_SIZE;
        int id = i % MOV_INDEX_CLUSTER_SIZE;
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        tst = track->cluster[cl][id].size/track->cluster[cl][id].entries;
        if(oldtst != -1 && tst != oldtst) {
            equalChunks = 0;
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        }
        oldtst = tst;
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        entries += track->cluster[cl][id].entries;
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    }
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    if (equalChunks) {
        int sSize = track->cluster[0][0].size/track->cluster[0][0].entries;
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        put_be32(pb, sSize); // sample size 
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        put_be32(pb, entries); // sample count
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    }
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    else {
        put_be32(pb, 0); // sample size 
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        put_be32(pb, entries); // sample count 
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        for (i=0; i<track->entry; i++) {
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            int cl = i / MOV_INDEX_CLUSTER_SIZE;
            int id = i % MOV_INDEX_CLUSTER_SIZE;
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            for ( j=0; j<track->cluster[cl][id].entries; j++) {
                put_be32(pb, track->cluster[cl][id].size /
                         track->cluster[cl][id].entries);
            }
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        }
    }
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    return updateSize (pb, pos);
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}

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/* Sample to chunk atom */
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static int mov_write_stsc_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    int index = 0, oldval = -1, i, entryPos, curpos;

    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
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    put_tag(pb, "stsc");
    put_be32(pb, 0); // version & flags 
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    entryPos = url_ftell(pb);
    put_be32(pb, track->entry); // entry count 
    for (i=0; i<track->entry; i++) {
        int cl = i / MOV_INDEX_CLUSTER_SIZE;
        int id = i % MOV_INDEX_CLUSTER_SIZE;
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        if(oldval != track->cluster[cl][id].samplesInChunk)
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        {
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            put_be32(pb, i+1); // first chunk 
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            put_be32(pb, track->cluster[cl][id].samplesInChunk); // samples per chunk
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            put_be32(pb, 0x1); // sample description index 
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            oldval = track->cluster[cl][id].samplesInChunk;
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            index++;
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        }
    }
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    curpos = url_ftell(pb);
    url_fseek(pb, entryPos, SEEK_SET);
    put_be32(pb, index); // rewrite size 
    url_fseek(pb, curpos, SEEK_SET);
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    return updateSize (pb, pos);
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}

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/* Sync sample atom */
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static int mov_write_stss_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    long curpos;
    int i, index = 0, entryPos;
    int pos = url_ftell(pb);
    put_be32(pb, 0); // size 
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    put_tag(pb, "stss");
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    put_be32(pb, 0); // version & flags 
    entryPos = url_ftell(pb);
    put_be32(pb, track->entry); // entry count 
    for (i=0; i<track->entry; i++) {
        int cl = i / MOV_INDEX_CLUSTER_SIZE;
        int id = i % MOV_INDEX_CLUSTER_SIZE;
        if(track->cluster[cl][id].key_frame == 1) {
            put_be32(pb, i+1);
            index++;
        }
    }
    curpos = url_ftell(pb);
    url_fseek(pb, entryPos, SEEK_SET);
    put_be32(pb, index); // rewrite size 
    url_fseek(pb, curpos, SEEK_SET);
    return updateSize (pb, pos);
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}

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static int mov_write_damr_tag(ByteIOContext *pb)
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{
    put_be32(pb, 0x11); /* size */
    put_tag(pb, "damr");
    put_tag(pb, "FFMP");
    put_byte(pb, 0);
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    put_be16(pb, 0x80); /* Mode set (all modes for AMR_NB) */
    put_be16(pb, 0xa); /* Mode change period (no restriction) */
    //put_be16(pb, 0x81ff); /* Mode set (all modes for AMR_NB) */
    //put_be16(pb, 1); /* Mode change period (no restriction) */
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    return 0x11;
}

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

    put_be32(pb, 0);     /* size */
    put_tag(pb, "wave");

    put_be32(pb, 12);    /* size */
    put_tag(pb, "frma");
    put_tag(pb, "mp4a");

    put_be32(pb, 12);    /* size */
    put_tag(pb, "mp4a");
    put_be32(pb, 0);

    mov_write_esds_tag(pb, track);

    put_be32(pb, 12);    /* size */
    put_tag(pb, "srcq");
    put_be32(pb, 0x40);

    put_be32(pb, 8);     /* size */
    put_be32(pb, 0);     /* null tag */

    return updateSize (pb, pos);
}

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const CodecTag codec_movaudio_tags[] = {
    { CODEC_ID_PCM_MULAW, MKTAG('u', 'l', 'a', 'w') },
    { CODEC_ID_PCM_ALAW, MKTAG('a', 'l', 'a', 'w') },
    { CODEC_ID_ADPCM_IMA_QT, MKTAG('i', 'm', 'a', '4') },
    { CODEC_ID_MACE3, MKTAG('M', 'A', 'C', '3') },
    { CODEC_ID_MACE6, MKTAG('M', 'A', 'C', '6') },
    { CODEC_ID_AAC, MKTAG('m', 'p', '4', 'a') },
    { CODEC_ID_AMR_NB, MKTAG('s', 'a', 'm', 'r') },
    { CODEC_ID_PCM_S16BE, MKTAG('t', 'w', 'o', 's') },
    { CODEC_ID_PCM_S16LE, MKTAG('s', 'o', 'w', 't') },
    { CODEC_ID_MP3, MKTAG('.', 'm', 'p', '3') },
    { 0, 0 },
};

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static int mov_write_audio_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    int pos = url_ftell(pb);
    int tag;
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    put_be32(pb, 0); /* size */
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    tag = track->enc->codec_tag;
    if (!tag)
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    tag = codec_get_tag(codec_movaudio_tags, track->enc->codec_id);
    // if no mac fcc found, try with Microsoft tags
    if (!tag)
    {
	int tmp = codec_get_tag(codec_wav_tags, track->enc->codec_id);
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        tag = MKTAG('m', 's', ((tmp >> 8) & 0xff), (tmp & 0xff));
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    }
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    put_le32(pb, tag); // store it byteswapped
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    put_be32(pb, 0); /* Reserved */
    put_be16(pb, 0); /* Reserved */
    put_be16(pb, 1); /* Data-reference index, XXX  == 1 */
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    /* SoundDescription */
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    if(track->mode == MODE_MOV && track->enc->codec_id == CODEC_ID_AAC)
        put_be16(pb, 1); /* Version 1 */
    else
        put_be16(pb, 0); /* Version 0 */
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    put_be16(pb, 0); /* Revision level */
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    put_be32(pb, 0); /* Reserved */

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    put_be16(pb, track->enc->channels); /* Number of channels */
    /* TODO: Currently hard-coded to 16-bit, there doesn't seem
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                 to be a good way to get number of bits of audio */
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    put_be16(pb, 0x10); /* Reserved */
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    if(track->enc->codec_id == CODEC_ID_AAC ||
       track->enc->codec_id == CODEC_ID_MP3)
    {
        put_be16(pb, 0xfffe); /* compression ID (vbr)*/
    }
    else
    {
        put_be16(pb, 0); /* compression ID (= 0) */
    }
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    put_be16(pb, 0); /* packet size (= 0) */
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    put_be16(pb, track->timescale); /* Time scale */
    put_be16(pb, 0); /* Reserved */

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    if(track->mode == MODE_MOV && track->enc->codec_id == CODEC_ID_AAC)
    {
        /* SoundDescription V1 extended info */
        put_be32(pb, track->enc->frame_size); /* Samples per packet  */
        put_be32(pb, 1536); /* Bytes per packet */
        put_be32(pb, 2); /* Bytes per frame */
        put_be32(pb, 2); /* Bytes per sample */
    }

    if(track->enc->codec_id == CODEC_ID_AAC) {
        if( track->mode == MODE_MOV ) mov_write_wave_tag(pb, track);
        else mov_write_esds_tag(pb, track);
    }
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    if(track->enc->codec_id == CODEC_ID_AMR_NB)
        mov_write_damr_tag(pb);
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    return updateSize (pb, pos);
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}

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static int mov_write_d263_tag(ByteIOContext *pb)
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{
    put_be32(pb, 0xf); /* size */
    put_tag(pb, "d263");
    put_tag(pb, "FFMP");
    put_be16(pb, 0x0a);
    put_byte(pb, 0);
    return 0xf;
}

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/* TODO: No idea about these values */
static int mov_write_svq3_tag(ByteIOContext *pb)
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{
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    put_be32(pb, 0x15);
    put_tag(pb, "SMI ");
    put_tag(pb, "SEQH");
    put_be32(pb, 0x5);
    put_be32(pb, 0xe2c0211d);
    put_be32(pb, 0xc0000000);
    put_byte(pb, 0);   
    return 0x15;
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}

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static unsigned int descrLength(unsigned int len)
{
    if (len < 0x00000080)
        return 2 + len;
    else if (len < 0x00004000)
        return 3 + len;
    else if(len < 0x00200000)
        return 4 + len;
    else
        return 5 + len;
}

static void putDescr(ByteIOContext *pb, int tag, int size)
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{
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    uint32_t len;
    uint8_t  vals[4];

    len = size;
    vals[3] = (uint8_t)(len & 0x7f);
    len >>= 7;
    vals[2] = (uint8_t)((len & 0x7f) | 0x80); 
    len >>= 7;
    vals[1] = (uint8_t)((len & 0x7f) | 0x80); 
    len >>= 7;
    vals[0] = (uint8_t)((len & 0x7f) | 0x80);

    put_byte(pb, tag); // DescriptorTag

    if (size < 0x00000080)
    {
        put_byte(pb, vals[3]);
    }
    else if (size < 0x00004000)
    {
        put_byte(pb, vals[2]);
        put_byte(pb, vals[3]);
    }
    else if (size < 0x00200000)
    {
        put_byte(pb, vals[1]);
        put_byte(pb, vals[2]);
        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]);
    }
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}

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

    put_be32(pb, 0);               // size
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    put_tag(pb, "esds");
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    put_be32(pb, 0);               // Version
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    // ES descriptor
    putDescr(pb, 0x03, 3 + descrLength(13 + decoderSpecificInfoLen) +
             descrLength(1));
    put_be16(pb, 0x0001);          // ID (= 1)
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    put_byte(pb, 0x00);            // flags (= no flags)

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    // 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)

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    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

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

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

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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 },
};

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static int mov_write_video_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    int pos = url_ftell(pb);
    int tag;
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    put_be32(pb, 0); /* size */
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    tag = track->enc->codec_tag;
    if (!tag)
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    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);
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    put_le32(pb, tag); // store it byteswapped
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    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 */
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    put_be32(pb, 0); /* Data size (= 0) */
    put_be16(pb, 1); /* Frame count (= 1) */
    
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    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 */
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    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);
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}

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static int mov_write_stsd_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    int pos = url_ftell(pb);
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    put_be32(pb, 0); /* size */
    put_tag(pb, "stsd");
    put_be32(pb, 0); /* version & flags */
    put_be32(pb, 1); /* entry count */
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    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);
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    return updateSize(pb, pos);
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}

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

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

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static int mov_write_dref_tag(ByteIOContext *pb)
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{
    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;
}

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

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

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static int mov_write_smhd_tag(ByteIOContext *pb)
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{
    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;
}

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static int mov_write_vmhd_tag(ByteIOContext *pb)
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{
    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;
}

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static int mov_write_hdlr_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    char *descr, *hdlr, *hdlr_type;
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    int pos = url_ftell(pb);
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    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";
	}
    }
    
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    put_be32(pb, 0); /* size */
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    put_tag(pb, "hdlr");
    put_be32(pb, 0); /* Version & flags */
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    put_buffer(pb, hdlr, 4); /* handler */
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    put_tag(pb, hdlr_type); /* handler type */
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    put_be32(pb ,0); /* reserved */
    put_be32(pb ,0); /* reserved */
    put_be32(pb ,0); /* reserved */
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    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");
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    if(track->enc->codec_type == CODEC_TYPE_VIDEO)
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        mov_write_vmhd_tag(pb);
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    else
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        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);
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    return updateSize(pb, pos);
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}

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

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

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static int mov_write_tkhd_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    int64_t maxTrackLenTemp;
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    put_be32(pb, 0x5c); /* size (always 0x5c) */
    put_tag(pb, "tkhd");
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    put_be32(pb, 0xf); /* version & flags (track enabled) */
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    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 */
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    maxTrackLenTemp = ((int64_t)globalTimescale*(int64_t)track->trackDuration)/(int64_t)track->timescale;
    put_be32(pb, (long)maxTrackLenTemp); /* duration */
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    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) {
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        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);
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        put_be32(pb, track->enc->height*0x10000);
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    }
    else {
        put_be32(pb, 0);
        put_be32(pb, 0);
    }
    return 0x5c;
}

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

/* TODO: Not sorted out, but not necessary either */
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static int mov_write_iods_tag(ByteIOContext *pb, MOVContext *mov)
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{
    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;
}

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static int mov_write_mvhd_tag(ByteIOContext *pb, MOVContext *mov)
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{
    int maxTrackID = 1, maxTrackLen = 0, i;
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    int64_t maxTrackLenTemp;
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    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) {
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            maxTrackLenTemp = ((int64_t)globalTimescale*(int64_t)mov->tracks[i].trackDuration)/(int64_t)mov->tracks[i].timescale;
            if(maxTrackLen < maxTrackLenTemp)
                maxTrackLen = maxTrackLenTemp;
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            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 */
    put_be16(pb, 0x0100); /* reserved (preferred volume) 1.0 = normal */
    put_be16(pb, 0); /* reserved */
    put_be32(pb, 0); /* reserved */
    put_be32(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 */

    put_be32(pb, 0); /* reserved (preview time) */
    put_be32(pb, 0); /* reserved (preview duration) */
    put_be32(pb, 0); /* reserved (poster time) */
    put_be32(pb, 0); /* reserved (selection time) */
    put_be32(pb, 0); /* reserved (selection duration) */
    put_be32(pb, 0); /* reserved (current time) */
    put_be32(pb, maxTrackID+1); /* Next track id */
    return 0x6c;
}

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static int mov_write_itunes_hdlr_tag(ByteIOContext *pb, MOVContext* mov,
                                     AVFormatContext *s)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "hdlr");
    put_be32(pb, 0);
    put_be32(pb, 0);
    put_tag(pb, "mdir");
    put_tag(pb, "appl");
    put_be32(pb, 0);
    put_be32(pb, 0);
    put_be16(pb, 0);
    return updateSize(pb, pos);
}

/* helper function to write a data tag with the specified string as data */
static int mov_write_string_data_tag(ByteIOContext *pb, MOVContext* mov,
                                     AVFormatContext *s, const char *data)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "data");
    put_be32(pb, 1);
    put_be32(pb, 0);
    put_buffer(pb, data, strlen(data));
    return updateSize(pb, pos);
}

/* iTunes name of the song/movie */
static int mov_write_nam_tag(ByteIOContext *pb, MOVContext* mov,
                             AVFormatContext *s)
{
    int size = 0;
    if ( s->title[0] ) {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, "\251nam");
        mov_write_string_data_tag(pb, mov, s, s->title);
        size = updateSize(pb, pos);
    }
    return size;
}

/* iTunes name of the artist/performer */
static int mov_write_ART_tag(ByteIOContext *pb, MOVContext* mov,
                             AVFormatContext *s)
{
    int size = 0;
    if ( s->author[0] ) {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, "\251ART");
        // we use the author here as this is the only thing that we have...
        mov_write_string_data_tag(pb, mov, s, s->author);
        size = updateSize(pb, pos);
    }
    return size;
}

/* iTunes name of the writer */
static int mov_write_wrt_tag(ByteIOContext *pb, MOVContext* mov,
                             AVFormatContext *s)
{
    int size = 0;
    if ( s->author[0] ) {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, "\251wrt");
        mov_write_string_data_tag(pb, mov, s, s->author);
        size = updateSize(pb, pos);
    }
    return size;
}

/* iTunes name of the album */
static int mov_write_alb_tag(ByteIOContext *pb, MOVContext* mov,
                             AVFormatContext *s)
{
    int size = 0;
    if ( s->album[0] ) {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, "\251alb");
        mov_write_string_data_tag(pb, mov, s, s->album);
        size = updateSize(pb, pos);
    }
    return size;
}

/* iTunes year */
static int mov_write_day_tag(ByteIOContext *pb, MOVContext* mov,
                             AVFormatContext *s)
{
    char year[5];
    int size = 0;
    if ( s->year ) {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, "\251day");
        snprintf(year, 5, "%04d", s->year);
        mov_write_string_data_tag(pb, mov, s, year);
        size = updateSize(pb, pos);
    }
    return size;
}

/* iTunes tool used to create the file */
static int mov_write_too_tag(ByteIOContext *pb, MOVContext* mov,
                             AVFormatContext *s)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "\251too");
    mov_write_string_data_tag(pb, mov, s, LIBAVFORMAT_IDENT);
    return updateSize(pb, pos);
}

/* iTunes comment */
static int mov_write_cmt_tag(ByteIOContext *pb, MOVContext* mov,
                             AVFormatContext *s)
{
    int size = 0;
    if ( s->comment[0] ) {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, "\251cmt");
        mov_write_string_data_tag(pb, mov, s, s->comment);
        size = updateSize(pb, pos);
    }
    return size;
}

/* iTunes custom genre */
static int mov_write_gen_tag(ByteIOContext *pb, MOVContext* mov,
                             AVFormatContext *s)
{
    int size = 0;
    if ( s->genre[0] ) {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, "\251gen");
        mov_write_string_data_tag(pb, mov, s, s->genre);
        size = updateSize(pb, pos);
    }
    return size;
}

/* iTunes track number */
static int mov_write_trkn_tag(ByteIOContext *pb, MOVContext* mov,
                              AVFormatContext *s)
{
    int size = 0;
    if ( s->track ) {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, "trkn");
        {
            int pos = url_ftell(pb);
            put_be32(pb, 0); /* size */
            put_tag(pb, "data");
            put_be32(pb, 0);        // 8 bytes empty
            put_be32(pb, 0);
            put_be16(pb, 0);        // empty
            put_be16(pb, s->track); // track number
            put_be16(pb, 0);        // total track number
            put_be16(pb, 0);        // empty
            updateSize(pb, pos);
        }
        size = updateSize(pb, pos);
    }
    return size;
}

/* iTunes meta data list */
static int mov_write_ilst_tag(ByteIOContext *pb, MOVContext* mov,
                              AVFormatContext *s)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "ilst");
    mov_write_nam_tag(pb, mov, s);
    mov_write_ART_tag(pb, mov, s);
    mov_write_wrt_tag(pb, mov, s);
    mov_write_alb_tag(pb, mov, s);
    mov_write_day_tag(pb, mov, s);
    mov_write_too_tag(pb, mov, s);
    mov_write_cmt_tag(pb, mov, s);
    mov_write_gen_tag(pb, mov, s);
    mov_write_trkn_tag(pb, mov, s);
    return updateSize(pb, pos);
}

/* iTunes meta data tag */
static int mov_write_meta_tag(ByteIOContext *pb, MOVContext* mov,
                              AVFormatContext *s)
{
    int size = 0;

    // only save meta tag if required
    if ( s->title[0] || s->author[0] || s->album[0] || s->year || 
         s->comment[0] || s->genre[0] || s->track ) {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, "meta");
        put_be32(pb, 0);
        mov_write_itunes_hdlr_tag(pb, mov, s);
        mov_write_ilst_tag(pb, mov, s);
        size = updateSize(pb, pos);
    }
    return size;
}
    
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static int mov_write_udta_tag(ByteIOContext *pb, MOVContext* mov,
                              AVFormatContext *s)
{
    int pos = url_ftell(pb);
    int i;

    put_be32(pb, 0); /* size */
    put_tag(pb, "udta");

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    /* iTunes meta data */
    mov_write_meta_tag(pb, mov, s);

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    /* Requirements */
    for (i=0; i<MAX_STREAMS; i++) {
        if(mov->tracks[i].entry <= 0) continue;
        if (mov->tracks[i].enc->codec_id == CODEC_ID_AAC ||
            mov->tracks[i].enc->codec_id == CODEC_ID_MPEG4) {
            int pos = url_ftell(pb);
            put_be32(pb, 0); /* size */
            put_tag(pb, "\251req");
            put_be16(pb, sizeof("QuickTime 6.0 or greater") - 1);
            put_be16(pb, 0);
            put_buffer(pb, "QuickTime 6.0 or greater",
                       sizeof("QuickTime 6.0 or greater") - 1);
            updateSize(pb, pos);
            break;
        }
    }

    /* Encoder */
Michael Niedermayer's avatar
Michael Niedermayer committed
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    if(!(mov->tracks[0].enc->flags & CODEC_FLAG_BITEXACT))
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    {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, "\251enc");
        put_be16(pb, sizeof(LIBAVFORMAT_IDENT) - 1); /* string length */
        put_be16(pb, 0);
        put_buffer(pb, LIBAVFORMAT_IDENT, sizeof(LIBAVFORMAT_IDENT) - 1);
        updateSize(pb, pos);
    }

    if( s->title[0] )
    {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, "\251nam");
        put_be16(pb, strlen(s->title)); /* string length */
        put_be16(pb, 0);
        put_buffer(pb, s->title, strlen(s->title));
        updateSize(pb, pos);
    }

    if( s->author[0] )
    {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, /*"\251aut"*/ "\251day" );
        put_be16(pb, strlen(s->author)); /* string length */
        put_be16(pb, 0);
        put_buffer(pb, s->author, strlen(s->author));
        updateSize(pb, pos);
    }

    if( s->comment[0] )
    {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, "\251des");
        put_be16(pb, strlen(s->comment)); /* string length */
        put_be16(pb, 0);
        put_buffer(pb, s->comment, strlen(s->comment));
        updateSize(pb, pos);
    }

    return updateSize(pb, pos);
}

static int mov_write_moov_tag(ByteIOContext *pb, MOVContext *mov,
                              AVFormatContext *s)
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{
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    int pos, i;
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    pos = url_ftell(pb);
    put_be32(pb, 0); /* size placeholder*/
    put_tag(pb, "moov");
    mov->timescale = globalTimescale;

    for (i=0; i<MAX_STREAMS; i++) {
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        if(mov->tracks[i].entry <= 0) continue;

        if(mov->tracks[i].enc->codec_type == CODEC_TYPE_VIDEO) {
            mov->tracks[i].timescale = mov->tracks[i].enc->frame_rate;
            mov->tracks[i].sampleDuration = mov->tracks[i].enc->frame_rate_base;
        }
        else if(mov->tracks[i].enc->codec_type == CODEC_TYPE_AUDIO) {
            /* If AMR, track timescale = 8000, AMR_WB = 16000 */
            if(mov->tracks[i].enc->codec_id == CODEC_ID_AMR_NB) {
                mov->tracks[i].sampleDuration = 160;  // Bytes per chunk
                mov->tracks[i].timescale = 8000;
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            }
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            else {
                mov->tracks[i].timescale = mov->tracks[i].enc->sample_rate;
                mov->tracks[i].sampleDuration = mov->tracks[i].enc->frame_size;
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            }
        }
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        mov->tracks[i].trackDuration = 
            mov->tracks[i].sampleCount * mov->tracks[i].sampleDuration;
        mov->tracks[i].time = mov->time;
        mov->tracks[i].trackID = i+1;
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    }

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    mov_write_mvhd_tag(pb, mov);
    //mov_write_iods_tag(pb, mov);
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    for (i=0; i<MAX_STREAMS; i++) {
        if(mov->tracks[i].entry > 0) {
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            mov_write_trak_tag(pb, &(mov->tracks[i]));
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        }
    }

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    mov_write_udta_tag(pb, mov, s);

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    return updateSize(pb, pos);
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}