avi.c

video linux conference

        i_count = p_fifo->i_depth;
        while( i_count > 1 )
        {
            avi_idx1_entry_t *p_idx;
            block_t *p_data;

            p_data = block_FifoGet( p_fifo );
            if( p_fifo->i_depth > 0 )
            {
                block_t *p_next = block_FifoShow( p_fifo );
                p_data->i_length = p_next->i_dts - p_data->i_dts;
            }

            p_stream->i_frames++;
            if( p_data->i_length < 0 )
            {
                msg_Warn( p_mux, "argg length < 0 l" );
                block_Release( p_data );
                i_count--;
                continue;
            }
            p_stream->i_duration  += p_data->i_length;
            p_stream->i_totalsize += p_data->i_buffer;

            /* add idx1 entry for this frame */
            p_idx = &p_sys->idx1.entry[p_sys->idx1.i_entry_count];
            memcpy( p_idx->fcc, p_stream->fcc, 4 );
            p_idx->i_flags = AVIIF_KEYFRAME;
            p_idx->i_pos   = p_sys->i_movi_size + 4;
            p_idx->i_length= p_data->i_buffer;
            p_sys->idx1.i_entry_count++;
            if( p_sys->idx1.i_entry_count >= p_sys->idx1.i_entry_max )
            {
                p_sys->idx1.i_entry_max += 10000;
                p_sys->idx1.entry = realloc( p_sys->idx1.entry,
                                             p_sys->idx1.i_entry_max * sizeof( avi_idx1_entry_t ) );
            }

            p_data = block_Realloc( p_data, 8, p_data->i_buffer );
            if( p_data )
            {
                SetFCC( p_data->p_buffer, p_stream->fcc );
                SetDWLE( p_data->p_buffer + 4, p_data->i_buffer - 8 );

                if( p_data->i_buffer & 0x01 )
                {
                    p_data = block_Realloc( p_data, 0, p_data->i_buffer + 1 );
                }

                p_sys->i_movi_size += p_data->i_buffer;
                sout_AccessOutWrite( p_mux->p_access, p_data );
            }

            i_count--;
        }

    }
    return( 0 );
}

/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/

typedef struct buffer_out_s
{
    int      i_buffer_size;
    int      i_buffer;
    uint8_t  *p_buffer;

} buffer_out_t;

static void bo_Init( buffer_out_t *p_bo, int i_size, uint8_t *p_buffer )
{
    p_bo->i_buffer_size = i_size;
    p_bo->i_buffer = 0;
    p_bo->p_buffer = p_buffer;
}
static void bo_AddByte( buffer_out_t *p_bo, uint8_t i )
{
    if( p_bo->i_buffer < p_bo->i_buffer_size )
    {
        p_bo->p_buffer[p_bo->i_buffer] = i;
    }
    p_bo->i_buffer++;
}
static void bo_AddWordLE( buffer_out_t *p_bo, uint16_t i )
{
    bo_AddByte( p_bo, i &0xff );
    bo_AddByte( p_bo, ( ( i >> 8) &0xff ) );
}
static void bo_AddWordBE( buffer_out_t *p_bo, uint16_t i )
{
    bo_AddByte( p_bo, ( ( i >> 8) &0xff ) );
    bo_AddByte( p_bo, i &0xff );
}
static void bo_AddDWordLE( buffer_out_t *p_bo, uint32_t i )
{
    bo_AddWordLE( p_bo, i &0xffff );
    bo_AddWordLE( p_bo, ( ( i >> 16) &0xffff ) );
}
static void bo_AddDWordBE( buffer_out_t *p_bo, uint32_t i )
{
    bo_AddWordBE( p_bo, ( ( i >> 16) &0xffff ) );
    bo_AddWordBE( p_bo, i &0xffff );
}
#if 0
static void bo_AddLWordLE( buffer_out_t *p_bo, uint64_t i )
{
    bo_AddDWordLE( p_bo, i &0xffffffff );
    bo_AddDWordLE( p_bo, ( ( i >> 32) &0xffffffff ) );
}
static void bo_AddLWordBE( buffer_out_t *p_bo, uint64_t i )
{
    bo_AddDWordBE( p_bo, ( ( i >> 32) &0xffffffff ) );
    bo_AddDWordBE( p_bo, i &0xffffffff );
}
#endif

static void bo_AddFCC( buffer_out_t *p_bo, char *fcc )
{
    bo_AddByte( p_bo, fcc[0] );
    bo_AddByte( p_bo, fcc[1] );
    bo_AddByte( p_bo, fcc[2] );
    bo_AddByte( p_bo, fcc[3] );
}

static void bo_AddMem( buffer_out_t *p_bo, int i_size, uint8_t *p_mem )
{
    int i;

    for( i = 0; i < i_size; i++ )
    {
        bo_AddByte( p_bo, p_mem[i] );
    }
}

/****************************************************************************
 ****************************************************************************
 **
 ** avi header generation
 **
 ****************************************************************************
 ****************************************************************************/
#define AVI_BOX_ENTER( fcc ) \
    buffer_out_t _bo_sav_; \
    bo_AddFCC( p_bo, fcc ); \
    _bo_sav_ = *p_bo; \
    bo_AddDWordLE( p_bo, 0 )

#define AVI_BOX_ENTER_LIST( fcc ) \
    AVI_BOX_ENTER( "LIST" ); \
    bo_AddFCC( p_bo, fcc )

#define AVI_BOX_EXIT( i_err ) \
    if( p_bo->i_buffer&0x01 ) bo_AddByte( p_bo, 0 ); \
    bo_AddDWordLE( &_bo_sav_, p_bo->i_buffer - _bo_sav_.i_buffer - 4 ); \
    return( i_err );

static int avi_HeaderAdd_avih( sout_mux_t *p_mux,
                               buffer_out_t *p_bo )
{
    sout_mux_sys_t  *p_sys = p_mux->p_sys;
    avi_stream_t    *p_video = NULL;
    int         i_stream;
    uint32_t    i_microsecperframe;
    int         i_maxbytespersec;
    int         i_totalframes;
    AVI_BOX_ENTER( "avih" );

    if( p_sys->i_stream_video >= 0 )
    {
        p_video = &p_sys->stream[p_sys->i_stream_video];
        if( p_video->i_frames <= 0 )
        {
        //    p_video = NULL;
        }
    }

    if( p_video )
    {
        i_microsecperframe =
            (uint32_t)( (float)1000000 /
                        (float)p_sys->stream[p_sys->i_stream_video].f_fps );
        i_totalframes = p_sys->stream[p_sys->i_stream_video].i_frames;
    }
    else
    {
        msg_Warn( p_mux, "avi file without video track isn't a good idea..." );
        i_microsecperframe = 0;
        i_totalframes = 0;
    }

    for( i_stream = 0,i_maxbytespersec = 0; i_stream < p_sys->i_streams; i_stream++ )
    {
        if( p_sys->stream[i_stream].i_duration > 0 )
        {
            i_maxbytespersec +=
                p_sys->stream[p_sys->i_stream_video].i_totalsize /
                p_sys->stream[p_sys->i_stream_video].i_duration;
        }
    }

    bo_AddDWordLE( p_bo, i_microsecperframe );
    bo_AddDWordLE( p_bo, i_maxbytespersec );
    bo_AddDWordLE( p_bo, 0 );                   /* padding */
    bo_AddDWordLE( p_bo, AVIF_TRUSTCKTYPE |
                         AVIF_HASINDEX |
                         AVIF_ISINTERLEAVED );  /* flags */
    bo_AddDWordLE( p_bo, i_totalframes );
    bo_AddDWordLE( p_bo, 0 );                   /* initial frame */
    bo_AddDWordLE( p_bo, p_sys->i_streams );    /* streams count */
    bo_AddDWordLE( p_bo, 1024 * 1024 );         /* suggested buffer size */
    if( p_video )
    {
        bo_AddDWordLE( p_bo, p_video->p_bih->biWidth );
        bo_AddDWordLE( p_bo, p_video->p_bih->biHeight );
    }
    else
    {
        bo_AddDWordLE( p_bo, 0 );
        bo_AddDWordLE( p_bo, 0 );
    }
    bo_AddDWordLE( p_bo, 0 );                   /* ???? */
    bo_AddDWordLE( p_bo, 0 );                   /* ???? */
    bo_AddDWordLE( p_bo, 0 );                   /* ???? */
    bo_AddDWordLE( p_bo, 0 );                   /* ???? */

    AVI_BOX_EXIT( 0 );
}
static int avi_HeaderAdd_strh( sout_mux_t   *p_mux,
                               buffer_out_t *p_bo,
                               avi_stream_t *p_stream )
{
    AVI_BOX_ENTER( "strh" );

    switch( p_stream->i_cat )
    {
        case VIDEO_ES:
            {
                bo_AddFCC( p_bo, "vids" );
                bo_AddDWordBE( p_bo, p_stream->p_bih->biCompression );
                bo_AddDWordLE( p_bo, 0 );   /* flags */
                bo_AddWordLE(  p_bo, 0 );   /* priority */
                bo_AddWordLE(  p_bo, 0 );   /* langage */
                bo_AddDWordLE( p_bo, 0 );   /* initial frame */
                bo_AddDWordLE( p_bo, 1000 );/* scale */
                bo_AddDWordLE( p_bo, (uint32_t)( 1000 * p_stream->f_fps ));
                bo_AddDWordLE( p_bo, 0 );   /* start */
                bo_AddDWordLE( p_bo, p_stream->i_frames );
                bo_AddDWordLE( p_bo, 1024 * 1024 );
                bo_AddDWordLE( p_bo, -1 );  /* quality */
                bo_AddDWordLE( p_bo, 0 );   /* samplesize */
                bo_AddWordLE(  p_bo, 0 );   /* ??? */
                bo_AddWordLE(  p_bo, 0 );   /* ??? */
                bo_AddWordLE(  p_bo, p_stream->p_bih->biWidth );
                bo_AddWordLE(  p_bo, p_stream->p_bih->biHeight );
            }
            break;
        case AUDIO_ES:
            {
                int i_rate, i_scale, i_samplesize;

                i_samplesize = p_stream->p_wf->nBlockAlign;
                if( i_samplesize > 1 )
                {
                    i_scale = i_samplesize;
                    i_rate = /*i_scale **/ p_stream->i_bitrate / 8;
                }
                else
                {
                    i_samplesize = 1;
                    i_scale = 1000;
                    i_rate = 1000 * p_stream->i_bitrate / 8;
                }
                bo_AddFCC( p_bo, "auds" );
                bo_AddDWordLE( p_bo, 0 );   /* tag */
                bo_AddDWordLE( p_bo, 0 );   /* flags */
                bo_AddWordLE(  p_bo, 0 );   /* priority */
                bo_AddWordLE(  p_bo, 0 );   /* langage */
                bo_AddDWordLE( p_bo, 0 );   /* initial frame */
                bo_AddDWordLE( p_bo, i_scale );/* scale */
                bo_AddDWordLE( p_bo, i_rate );
                bo_AddDWordLE( p_bo, 0 );   /* start */
                bo_AddDWordLE( p_bo, p_stream->i_frames );
                bo_AddDWordLE( p_bo, 10 * 1024 );
                bo_AddDWordLE( p_bo, -1 );  /* quality */
                bo_AddDWordLE( p_bo, i_samplesize );
                bo_AddWordLE(  p_bo, 0 );   /* ??? */
                bo_AddWordLE(  p_bo, 0 );   /* ??? */
                bo_AddWordLE(  p_bo, 0 );
                bo_AddWordLE(  p_bo, 0 );
            }
            break;
    }

    AVI_BOX_EXIT( 0 );
}

static int avi_HeaderAdd_strf( sout_mux_t *p_mux,
                               buffer_out_t *p_bo,
                               avi_stream_t *p_stream )
{
    AVI_BOX_ENTER( "strf" );

    switch( p_stream->i_cat )
    {
        case AUDIO_ES:
            bo_AddWordLE( p_bo, p_stream->p_wf->wFormatTag );
            bo_AddWordLE( p_bo, p_stream->p_wf->nChannels );
            bo_AddDWordLE( p_bo, p_stream->p_wf->nSamplesPerSec );
            bo_AddDWordLE( p_bo, p_stream->p_wf->nAvgBytesPerSec );
            bo_AddWordLE( p_bo, p_stream->p_wf->nBlockAlign );
            bo_AddWordLE( p_bo, p_stream->p_wf->wBitsPerSample );
            bo_AddWordLE( p_bo, p_stream->p_wf->cbSize );
            bo_AddMem( p_bo, p_stream->p_wf->cbSize, (uint8_t*)&p_stream->p_wf[1] );
            break;
        case VIDEO_ES:
            bo_AddDWordLE( p_bo, p_stream->p_bih->biSize );
            bo_AddDWordLE( p_bo, p_stream->p_bih->biWidth );
            bo_AddDWordLE( p_bo, p_stream->p_bih->biHeight );
            bo_AddWordLE( p_bo, p_stream->p_bih->biPlanes );
            bo_AddWordLE( p_bo, p_stream->p_bih->biBitCount );
            if( VLC_FOURCC( 0, 0, 0, 1 ) == 0x00000001 )
            {
                bo_AddDWordBE( p_bo, p_stream->p_bih->biCompression );
            }
            else
            {
                bo_AddDWordLE( p_bo, p_stream->p_bih->biCompression );
            }
            bo_AddDWordLE( p_bo, p_stream->p_bih->biSizeImage );
            bo_AddDWordLE( p_bo, p_stream->p_bih->biXPelsPerMeter );
            bo_AddDWordLE( p_bo, p_stream->p_bih->biYPelsPerMeter );
            bo_AddDWordLE( p_bo, p_stream->p_bih->biClrUsed );
            bo_AddDWordLE( p_bo, p_stream->p_bih->biClrImportant );
            bo_AddMem( p_bo,
                       p_stream->p_bih->biSize - sizeof( BITMAPINFOHEADER ),
                       (uint8_t*)&p_stream->p_bih[1] );
            break;
    }

    AVI_BOX_EXIT( 0 );
}

static int avi_HeaderAdd_strl( sout_mux_t *p_mux,
                               buffer_out_t *p_bo,
                               avi_stream_t *p_stream )
{
    AVI_BOX_ENTER_LIST( "strl" );

    avi_HeaderAdd_strh( p_mux, p_bo, p_stream );
    avi_HeaderAdd_strf( p_mux, p_bo, p_stream );

    AVI_BOX_EXIT( 0 );
}

static block_t *avi_HeaderCreateRIFF( sout_mux_t *p_mux )
{
    sout_mux_sys_t      *p_sys = p_mux->p_sys;
    block_t       *p_hdr;
    int                 i_stream;
    int                 i_maxbytespersec;
    int                 i_junk;
    buffer_out_t        bo;

    p_hdr = block_New( p_mux, HDR_SIZE );
    memset( p_hdr->p_buffer, 0, HDR_SIZE );

    bo_Init( &bo, HDR_SIZE, p_hdr->p_buffer );

    bo_AddFCC( &bo, "RIFF" );
    bo_AddDWordLE( &bo, p_sys->i_movi_size + HDR_SIZE - 8 + p_sys->i_idx1_size );
    bo_AddFCC( &bo, "AVI " );

    bo_AddFCC( &bo, "LIST" );
    bo_AddDWordLE( &bo, HDR_SIZE - 8);
    bo_AddFCC( &bo, "hdrl" );

    avi_HeaderAdd_avih( p_mux, &bo );
    for( i_stream = 0,i_maxbytespersec = 0; i_stream < p_sys->i_streams; i_stream++ )
    {
        avi_HeaderAdd_strl( p_mux, &bo, &p_sys->stream[i_stream] );
    }

    i_junk = HDR_SIZE - bo.i_buffer - 8 - 12;
    bo_AddFCC( &bo, "JUNK" );
    bo_AddDWordLE( &bo, i_junk );

    bo.i_buffer += i_junk;
    bo_AddFCC( &bo, "LIST" );
    bo_AddDWordLE( &bo, p_sys->i_movi_size + 4 );
    bo_AddFCC( &bo, "movi" );

    return( p_hdr );
}

static block_t * avi_HeaderCreateidx1( sout_mux_t *p_mux )
{
    sout_mux_sys_t      *p_sys = p_mux->p_sys;
    block_t       *p_idx1;
    uint32_t            i_idx1_size;
    unsigned int        i;
    buffer_out_t        bo;

    i_idx1_size = 16 * p_sys->idx1.i_entry_count;

    p_idx1 = block_New( p_mux, i_idx1_size + 8 );
    memset( p_idx1->p_buffer, 0, i_idx1_size );

    bo_Init( &bo, i_idx1_size, p_idx1->p_buffer );
    bo_AddFCC( &bo, "idx1" );
    bo_AddDWordLE( &bo, i_idx1_size );

    for( i = 0; i < p_sys->idx1.i_entry_count; i++ )
    {
        bo_AddFCC( &bo, p_sys->idx1.entry[i].fcc );
        bo_AddDWordLE( &bo, p_sys->idx1.entry[i].i_flags );
        bo_AddDWordLE( &bo, p_sys->idx1.entry[i].i_pos );
        bo_AddDWordLE( &bo, p_sys->idx1.entry[i].i_length );
    }

    return( p_idx1 );
}