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Commit 94431db8 authored by hartman's avatar hartman
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* Victory at last. The h264 packetizer is fixed. Thx to Haali and gibalou for the insights. 

  - manage private data properly
  - use 4 byte startcodes
parent 7cb0b7cc
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modules/packetizer/h264.c
View file @ 94431db8
......@@ -121,6 +121,8 @@ static block_t *nal_get_annexeb( decoder_t *, uint8_t *p, int );
/*****************************************************************************
* 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 )
{
......@@ -165,12 +167,13 @@ static int Open( vlc_object_t *p_this )
/* 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' ) )
{
/* 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;
......@@ -180,7 +183,6 @@ static int Open( vlc_object_t *p_this )
/* Read SPS */
i_sps = (*p++)&0x1f;
for( i = 0; i < i_sps; i++ )
{
int i_length = GetWBE( p );
......@@ -206,11 +208,25 @@ static int Open( vlc_object_t *p_this )
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( p_dec->fmt_out.p_extra, p_sys->p_pps->p_buffer, p_sys->p_pps->i_buffer);
memcpy( p_dec->fmt_out.p_extra+p_sys->p_pps->i_buffer, p_sys->p_sps->p_buffer, p_sys->p_sps->i_buffer);
/* 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;
......@@ -251,6 +267,8 @@ static void Close( vlc_object_t *p_this )
/****************************************************************************
* Packetize: the whole thing
* Search for the startcodes 3 or more bytes
* Feed ParseNALBlock ALWAYS with 4 byte startcode prepended NALs
****************************************************************************/
static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
{
......@@ -266,6 +284,7 @@ static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
switch( p_sys->i_state )
{
case STATE_NOSYNC:
/* Skip untill 3 byte startcode 0 0 1 */
if( block_FindStartcodeFromOffset( &p_sys->bytestream,
&p_sys->i_offset, p_sys->startcode+1, 3 ) == VLC_SUCCESS)
{
......@@ -274,6 +293,7 @@ static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
if( p_sys->i_offset )
{
/* skip the data */
block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
p_sys->i_offset = 0;
block_BytestreamFlush( &p_sys->bytestream );
......@@ -288,7 +308,7 @@ static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
p_sys->i_offset = 1; /* To find next startcode */
case STATE_NEXT_SYNC:
/* Find the next startcode */
/* Find the next 3 byte startcode 0 0 1*/
if( block_FindStartcodeFromOffset( &p_sys->bytestream,
&p_sys->i_offset, p_sys->startcode+1, 3 ) != VLC_SUCCESS)
{
......@@ -297,14 +317,17 @@ static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
}
/* Get the new fragment and set the pts/dts */
p_pic = block_New( p_dec, p_sys->i_offset );
p_pic = block_New( p_dec, p_sys->i_offset +1 );
p_pic->i_pts = p_sys->bytestream.p_block->i_pts;
p_pic->i_dts = p_sys->bytestream.p_block->i_dts;
/* Force 4 byte startcode 0 0 0 1 */
p_pic->p_buffer[0] = 0;
block_GetBytes( &p_sys->bytestream, p_pic->p_buffer,
p_pic->i_buffer );
block_GetBytes( &p_sys->bytestream, &p_pic->p_buffer[1],
p_pic->i_buffer-1 );
if( !p_pic->p_buffer[p_pic->i_buffer-1] ) p_pic->i_buffer--;
/* Remove trailing 0 bytes */
while( p_pic->i_buffer && (!p_pic->p_buffer[p_pic->i_buffer-1] ) ) p_pic->i_buffer--;
p_sys->i_offset = 0;
/* Parse the NAL */
......@@ -329,7 +352,9 @@ static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
}
/****************************************************************************
* PacketizeAVC1: the whole thing
* PacketizeAVC1: Takes VCL blocks of data and creates annexe B type NAL stream
* Will always use 4 byte 0 0 0 1 startcodes
* Should prepend the SPS and PPS to the front of the stream
****************************************************************************/
static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
{
......@@ -394,15 +419,16 @@ static block_t *nal_get_annexeb( decoder_t *p_dec, uint8_t *p, int i_size )
{
block_t *p_nal;
p_nal = block_New( p_dec, 3 + i_size );
p_nal = block_New( p_dec, 4 + i_size );
/* Add start code */
p_nal->p_buffer[0] = 0x00;
p_nal->p_buffer[1] = 0x00;
p_nal->p_buffer[2] = 0x01;
p_nal->p_buffer[2] = 0x00;
p_nal->p_buffer[3] = 0x01;
/* Copy nalu */
memcpy( &p_nal->p_buffer[3], p, i_size );
memcpy( &p_nal->p_buffer[4], p, i_size );
return p_nal;
}
......@@ -451,13 +477,17 @@ static inline int bs_read_se( bs_t *s )
}
/*****************************************************************************
* ParseNALBlock: parses annexB type NALs
* All p_frag blocks are required to start with 0 0 0 1 4-byte startcode
*****************************************************************************/
static block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_pic = NULL;
const int i_nal_ref_idc = (p_frag->p_buffer[3] >> 5)&0x03;
const int i_nal_type = p_frag->p_buffer[3]&0x1f;
const int i_nal_ref_idc = (p_frag->p_buffer[4] >> 5)&0x03;
const int i_nal_type = p_frag->p_buffer[4]&0x1f;
#define OUTPUT \
do { \
......@@ -493,8 +523,8 @@ static block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
bs_t s;
/* do not convert the whole frame */
nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[4],
__MIN( p_frag->i_buffer - 4, 60 ) );
nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
__MIN( p_frag->i_buffer - 5, 60 ) );
bs_init( &s, dec, i_dec );
/* first_mb_in_slice */
......@@ -573,8 +603,8 @@ static block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
p_sys->b_sps = VLC_TRUE;
nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[4],
p_frag->i_buffer - 4 );
nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
p_frag->i_buffer - 5 );
bs_init( &s, dec, i_dec );
/* Skip profile(8), constraint_set012, reserver(5), level(8) */
......@@ -685,7 +715,7 @@ static block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
else if( i_nal_type == NAL_PPS )
{
bs_t s;
bs_init( &s, &p_frag->p_buffer[4], p_frag->i_buffer - 4 );
bs_init( &s, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
if( !p_sys->b_pps ) msg_Dbg( p_dec, "found NAL_PPS" );
p_sys->b_pps = VLC_TRUE;
......
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