/****************************************************************************
* PacketizeAVC1: Takes VCL blocks of data and creates annexe B type NAL stream
* Will always use 4 byte 0 0 0 1 startcodes
* Will prepend a SPS and PPS before each keyframe
****************************************************************************/
static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_block;
block_t *p_ret = NULL;
uint8_t *p;
if( !pp_block || !*pp_block ) return NULL;
p_block = *pp_block;
*pp_block = NULL;
for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
{
block_t *p_pic;
int i_size = 0;
int i;
for( i = 0; i < p_sys->i_avcC_length_size; i++ )
{
i_size = (i_size << 8) | (*p++);
}
if( i_size > 0 )
{
block_t *p_part = nal_get_annexeb( p_dec, p, i_size );
p_part->i_dts = p_block->i_dts;
p_part->i_pts = p_block->i_pts;
/* Parse the NAL */
if( ( p_pic = ParseNALBlock( p_dec, p_part ) ) )
{
block_ChainAppend( &p_ret, p_pic );
}
}
p += i_size;
}
block_Release( p_block );
return p_ret;
}
/*****************************************************************************
* Open: probe the packetizer and return score
* When opening after demux, the packetizer is only loaded AFTER the decoder
* That means that what you set in fmt_out is ignored by the decoder in this special case
*****************************************************************************/
static int Open( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys;
if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'h', '2', '6', '4') &&
p_dec->fmt_in.i_codec != VLC_FOURCC( 'H', '2', '6', '4') &&
p_dec->fmt_in.i_codec != VLC_FOURCC( 'V', 'S', 'S', 'H') &&
p_dec->fmt_in.i_codec != VLC_FOURCC( 'v', 's', 's', 'h') &&
p_dec->fmt_in.i_codec != VLC_FOURCC( 'D', 'A', 'V', 'C') &&
( p_dec->fmt_in.i_codec != VLC_FOURCC( 'a', 'v', 'c', '1') ||
p_dec->fmt_in.i_extra < 7 ) )
{
return VLC_EGENERIC;
}
/* Allocate the memory needed to store the decoder's structure */
if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
{
msg_Err( p_dec, "out of memory" );
return VLC_EGENERIC;
}
p_sys->i_state = STATE_NOSYNC;
p_sys->i_offset = 0;
p_sys->startcode[0] = 0;
p_sys->startcode[1] = 0;
p_sys->startcode[2] = 0;
p_sys->startcode[3] = 1;
p_sys->bytestream = block_BytestreamInit( p_dec );
p_sys->b_slice = VLC_FALSE;
p_sys->p_frame = NULL;
p_sys->b_sps = VLC_FALSE;
p_sys->b_pps = VLC_FALSE;
p_sys->p_sps = 0;
p_sys->p_pps = 0;
p_sys->b_header= VLC_FALSE;
p_sys->slice.i_nal_type = -1;
p_sys->slice.i_nal_ref_idc = -1;
p_sys->slice.i_idr_pic_id = -1;
p_sys->slice.i_frame_num = -1;
p_sys->slice.i_frame_type = 0;
p_sys->slice.i_pic_parameter_set_id = -1;
p_sys->slice.i_field_pic_flag = 0;
p_sys->slice.i_bottom_field_flag = -1;
p_sys->slice.i_pic_order_cnt_lsb = -1;
p_sys->slice.i_delta_pic_order_cnt_bottom = -1;
/* Setup properties */
es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
p_dec->fmt_out.i_codec = VLC_FOURCC( 'h', '2', '6', '4' );
if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
{
/* This type of stream is produced by mp4 and matroska
* when we want to store it in another streamformat, you need to convert
* The fmt_in.p_extra should ALWAYS contain the avcC
* The fmt_out.p_extra should contain all the SPS and PPS with 4 byte startcodes */
uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
int i_sps, i_pps;
int i;
/* Parse avcC */
p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
/* Read SPS */
i_sps = (*p++)&0x1f;
for( i = 0; i < i_sps; i++ )
{
int i_length = GetWBE( p );
block_t *p_sps = nal_get_annexeb( p_dec, p + 2, i_length );
p_sys->p_sps = block_Duplicate( p_sps );
p_sps->i_pts = p_sps->i_dts = mdate();
ParseNALBlock( p_dec, p_sps );
p += 2 + i_length;
}
/* Read PPS */
i_pps = *p++;
for( i = 0; i < i_pps; i++ )
{
int i_length = GetWBE( p );
block_t *p_pps = nal_get_annexeb( p_dec, p + 2, i_length );
p_sys->p_pps = block_Duplicate( p_pps );
p_pps->i_pts = p_pps->i_dts = mdate();
ParseNALBlock( p_dec, p_pps );
p += 2 + i_length;
}
msg_Dbg( p_dec, "avcC length size=%d, sps=%d, pps=%d",
p_sys->i_avcC_length_size, i_sps, i_pps );
/* FIXME: FFMPEG isn't happy at all if you leave this */
if( p_dec->fmt_out.i_extra ) free( p_dec->fmt_out.p_extra );
p_dec->fmt_out.i_extra = 0; p_dec->fmt_out.p_extra = NULL;
/* Set the new extradata */
p_dec->fmt_out.i_extra = p_sys->p_pps->i_buffer + p_sys->p_sps->i_buffer;
p_dec->fmt_out.p_extra = (uint8_t*)malloc( p_dec->fmt_out.i_extra );
memcpy( (uint8_t*)p_dec->fmt_out.p_extra, p_sys->p_sps->p_buffer, p_sys->p_sps->i_buffer);
memcpy( (uint8_t*)p_dec->fmt_out.p_extra+p_sys->p_sps->i_buffer, p_sys->p_pps->p_buffer, p_sys->p_pps->i_buffer);
p_sys->b_header = VLC_TRUE;
/* Set callback */
p_dec->pf_packetize = PacketizeAVC1;
}
else
{
/* This type of stream contains data with 3 of 4 byte startcodes
* The fmt_in.p_extra MAY contain SPS/PPS with 4 byte startcodes
* The fmt_out.p_extra should be the same */
/* Set callback */
p_dec->pf_packetize = Packetize;
/* */
if( p_dec->fmt_in.i_extra > 0 )
{
block_t *p_init = block_New( p_dec, p_dec->fmt_in.i_extra );
block_t *p_pic;
memcpy( p_init->p_buffer, p_dec->fmt_in.p_extra,
p_dec->fmt_in.i_extra );
while( ( p_pic = Packetize( p_dec, &p_init ) ) )
{
/* Should not occur because we should only receive SPS/PPS */
block_Release( p_pic );
}
}
}
return VLC_SUCCESS;
}
/*****************************************************************************
* Open: probe the packetizer and return score
*****************************************************************************/
static int Open( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys;
if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'h', '2', '6', '4') &&
p_dec->fmt_in.i_codec != VLC_FOURCC( 'H', '2', '6', '4') &&
p_dec->fmt_in.i_codec != VLC_FOURCC( 'V', 'S', 'S', 'H') &&
p_dec->fmt_in.i_codec != VLC_FOURCC( 'v', 's', 's', 'h') &&
( p_dec->fmt_in.i_codec != VLC_FOURCC( 'a', 'v', 'c', '1') ||
p_dec->fmt_in.i_extra < 7 ) )
{
return VLC_EGENERIC;
}
/* Allocate the memory needed to store the decoder's structure */
if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
{
msg_Err( p_dec, "out of memory" );
return VLC_EGENERIC;
}
p_sys->i_state = STATE_NOSYNC;
p_sys->i_offset = 0;
p_sys->startcode[0] = 0;
p_sys->startcode[1] = 0;
p_sys->startcode[2] = 0;
p_sys->startcode[3] = 1;
p_sys->bytestream = block_BytestreamInit( p_dec );
p_sys->b_slice = VLC_FALSE;
p_sys->p_frame = NULL;
p_sys->i_dts = 0;
p_sys->i_pts = 0;
p_sys->i_flags = 0;
p_sys->b_sps = VLC_FALSE;
p_sys->i_nal_type = -1;
p_sys->i_nal_ref_idc = -1;
p_sys->i_idr_pic_id = -1;
p_sys->i_frame_num = -1;
/* Setup properties */
es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
p_dec->fmt_out.i_codec = VLC_FOURCC( 'h', '2', '6', '4' );
/* FIXME: FFMPEG isn't happy at all if you leave this */
if( p_dec->fmt_out.i_extra ) free( p_dec->fmt_out.p_extra );
p_dec->fmt_out.i_extra = 0;
p_dec->fmt_out.p_extra = 0;
if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
{
uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
int i_sps, i_pps;
int i;
/* Parse avcC */
p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
/* Read SPS */
i_sps = (*p++)&0x1f;
for( i = 0; i < i_sps; i++ )
{
int i_length = GetWBE( p );
block_t *p_sps = nal_get_annexeb( p_dec, p + 2, i_length );
ParseNALBlock( p_dec, p_sps );
p += 2 + i_length;
}
/* Read PPS */
i_pps = *p++;
for( i = 0; i < i_pps; i++ )
{
int i_length = GetWBE( p );
block_t *p_pps = nal_get_annexeb( p_dec, p + 2, i_length );
ParseNALBlock( p_dec, p_pps );
p += 2 + i_length;
}
msg_Dbg( p_dec, "avcC length size=%d sps=%d pps=%d",
p_sys->i_avcC_length_size, i_sps, i_pps );
/* Set callback */
p_dec->pf_packetize = PacketizeAVC1;
}
else
{
/* Set callback */
p_dec->pf_packetize = Packetize;
}
return VLC_SUCCESS;
}
