Skip to content

V
vlc-1.1
Commit 9cbc047c authored by Laurent Aimar's avatar Laurent Aimar
Browse files
Options

* mpegvideo: ported to new API (need more clean up).

parent 294d2ef0
Hide whitespace changes
Inline Side-by-side
Showing with 386 additions and 444 deletions
modules/packetizer/mpegvideo.c
View file @ 9cbc047c
...@@ -2,7 +2,7 @@ ...@@ -2,7 +2,7 @@
* mpegvideo.c * mpegvideo.c
***************************************************************************** *****************************************************************************
* Copyright (C) 2001, 2002 VideoLAN * Copyright (C) 2001, 2002 VideoLAN
* $Id: mpegvideo.c,v 1.21 2003/11/21 15:32:08 fenrir Exp $ * $Id: mpegvideo.c,v 1.22 2003/11/22 16:53:02 fenrir Exp $
* *
* Authors: Laurent Aimar <fenrir@via.ecp.fr> * Authors: Laurent Aimar <fenrir@via.ecp.fr>
* Eric Petit <titer@videolan.org> * Eric Petit <titer@videolan.org>
...@@ -39,537 +39,479 @@ ...@@ -39,537 +39,479 @@
/***************************************************************************** /*****************************************************************************
* Preamble * Preamble
*****************************************************************************/ *****************************************************************************/
#include <stdlib.h> /* malloc(), free() */
#include <vlc/vlc.h> #include <vlc/vlc.h>
#include <vlc/decoder.h> #include <vlc/decoder.h>
#include <vlc/input.h> #include <vlc/input.h>
#include <vlc/sout.h>
#include "codecs.h" /* WAVEFORMATEX BITMAPINFOHEADER */
#include <stdlib.h> /* malloc(), free() */
#include <string.h> /* strdup() */
/*****************************************************************************
* Local prototypes
*****************************************************************************/
typedef struct packetizer_s
{
/* Input properties */
decoder_fifo_t *p_fifo;
bit_stream_t bit_stream;
/* Output properties */
sout_packetizer_input_t *p_sout_input;
es_format_t output_format;
mtime_t i_interpolated_dts;
mtime_t i_old_duration;
mtime_t i_last_ref_pts;
double d_frame_rate;
int i_progressive_sequence;
int i_low_delay;
uint8_t p_sequence_header[150];
int i_sequence_header_length;
int i_last_sequence_header;
vlc_bool_t b_expect_discontinuity;
} packetizer_t;
static int Open ( vlc_object_t * );
static int Run ( decoder_fifo_t * );
static int InitThread ( packetizer_t * );
static void PacketizeThread ( packetizer_t * );
static void EndThread ( packetizer_t * );
static void BitstreamCallback ( bit_stream_t *, vlc_bool_t );
/***************************************************************************** /*****************************************************************************
* Module descriptor * Module descriptor
*****************************************************************************/ *****************************************************************************/
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
vlc_module_begin(); vlc_module_begin();
set_description( _("MPEG-I/II video packetizer") ); set_description( _("MPEG-I/II video packetizer") );
set_capability( "packetizer", 50 ); set_capability( "packetizer", 50 );
set_callbacks( Open, NULL ); set_callbacks( Open, Close );
vlc_module_end(); vlc_module_end();
/***************************************************************************** /*****************************************************************************
* OpenDecoder: probe the packetizer and return score * Local prototypes
*****************************************************************************
* Tries to launch a decoder and return score so that the interface is able
* to choose.
*****************************************************************************/ *****************************************************************************/
static int Open( vlc_object_t *p_this ) static block_t *Packetize( decoder_t *, block_t ** );
{
decoder_t *p_dec = (decoder_t*)p_this;
if( p_dec->p_fifo->i_fourcc != VLC_FOURCC( 'm', 'p', 'g', 'v') && static int mpgv_FindStartCode( uint8_t **pp_start, uint8_t *p_end );
p_dec->p_fifo->i_fourcc != VLC_FOURCC( 'm', 'p', 'g', '1') &&
p_dec->p_fifo->i_fourcc != VLC_FOURCC( 'm', 'p', 'g', '2') )
{
return VLC_EGENERIC;
}
p_dec->pf_run = Run; struct decoder_sys_t
return VLC_SUCCESS; {
} /* sequence header and extention */
block_t *p_seq;
block_t *p_ext;
/* current frame being building */
block_t *p_frame;
vlc_bool_t b_frame_slice;
vlc_bool_t b_frame_corrupted;
vlc_bool_t b_gop;
/* pts of current picture */
mtime_t i_pts;
mtime_t i_dts;
/* gathering buffer */
int i_buffer;
int i_buffer_size;
uint8_t *p_buffer;
uint8_t *p_start, *p_old;
/* */
int i_frame_rate;
int i_frame_rate_base;
vlc_bool_t b_seq_progressive;
vlc_bool_t b_low_delay;
/* */
int i_temporal_ref;
int i_picture_type;
int i_picture_structure;
int i_top_field_first;
int i_repeat_first_field;
int i_progressive_frame;
/* */
int i_seq_old; /* How many picture from last seq */
/* */
mtime_t i_interpolated_dts;
mtime_t i_old_duration;
mtime_t i_last_ref_pts;
};
/***************************************************************************** /*****************************************************************************
* RunDecoder: this function is called just after the thread is created * Open:
*****************************************************************************/ *****************************************************************************/
static int Run( decoder_fifo_t *p_fifo ) static int Open( vlc_object_t *p_this )
{ {
packetizer_t *p_pack; decoder_t *p_dec = (decoder_t*)p_this;
int b_error; decoder_sys_t *p_sys;
msg_Info( p_fifo, "Running mpegvideo packetizer" ); if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'm', 'p', 'g', '1' ) &&
if( !( p_pack = malloc( sizeof( packetizer_t ) ) ) ) p_dec->fmt_in.i_codec != VLC_FOURCC( 'm', 'p', 'g', '2' ) &&
p_dec->fmt_in.i_codec != VLC_FOURCC( 'm', 'p', 'g', 'v' ) )
{ {
msg_Err( p_fifo, "out of memory" ); return VLC_EGENERIC;
DecoderError( p_fifo );
return( -1 );
} }
memset( p_pack, 0, sizeof( packetizer_t ) );
p_pack->p_fifo = p_fifo; es_format_Init( &p_dec->fmt_out, VIDEO_ES, VLC_FOURCC( 'm', 'p', 'g', 'v' ) );
p_dec->pf_packetize = Packetize;
if( InitThread( p_pack ) != 0 ) p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
{
DecoderError( p_fifo );
return( -1 );
}
while( ( !p_pack->p_fifo->b_die )&&( !p_pack->p_fifo->b_error ) ) p_sys->p_seq = NULL;
{ p_sys->p_ext = NULL;
PacketizeThread( p_pack ); p_sys->p_frame = NULL;
} p_sys->b_frame_slice = VLC_FALSE;
p_sys->b_frame_corrupted = VLC_FALSE;
p_sys->b_gop = VLC_FALSE;
p_sys->i_buffer = 0;
p_sys->i_buffer_size = 10000;
p_sys->p_buffer = malloc( p_sys->i_buffer_size );
p_sys->p_start = p_sys->p_buffer;
p_sys->p_old = NULL;
if( ( b_error = p_pack->p_fifo->b_error ) ) p_sys->i_dts = 0;
{ p_sys->i_pts = 0;
DecoderError( p_pack->p_fifo );
}
EndThread( p_pack ); p_sys->i_frame_rate = 1;
p_sys->i_frame_rate_base = 1;
p_sys->b_seq_progressive = VLC_TRUE;
p_sys->b_low_delay = VLC_TRUE;
p_sys->i_seq_old = 0;
if( p_pack ) p_sys->i_temporal_ref = 0;
{ p_sys->i_picture_type = 0;
free( p_pack ); p_sys->i_picture_structure = 0x03; /* frame */
} p_sys->i_top_field_first = 0;
p_sys->i_repeat_first_field = 0;
p_sys->i_progressive_frame = 0;
if( b_error ) p_sys->i_interpolated_dts = 0;
{ p_sys->i_old_duration = 0;
return( -1 ); p_sys->i_last_ref_pts = 0;
}
return( 0 ); return VLC_SUCCESS;
} }
/***************************************************************************** /*****************************************************************************
* InitThread: initialize data before entering main loop * Close:
*****************************************************************************/ *****************************************************************************/
static void Close( vlc_object_t *p_this )
static int InitThread( packetizer_t *p_pack )
{ {
decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys = p_dec->p_sys;
p_pack->output_format.i_cat = VIDEO_ES; if( p_sys->p_seq )
p_pack->output_format.i_codec = VLC_FOURCC( 'm', 'p', 'g', 'v');
p_pack->output_format.video.i_width = 0;
p_pack->output_format.video.i_height = 0;
p_pack->output_format.i_bitrate= 0;
p_pack->output_format.i_extra = 0;
p_pack->output_format.p_extra = NULL;
p_pack->b_expect_discontinuity = 0;
p_pack->p_sout_input = NULL;
if( InitBitstream( &p_pack->bit_stream, p_pack->p_fifo,
BitstreamCallback, (void *)p_pack ) != VLC_SUCCESS )
{ {
msg_Err( p_pack->p_fifo, "cannot initialize bitstream" ); block_Release( p_sys->p_seq );
return -1;
} }
if( p_sys->p_ext )
return( 0 );
}
/* from ISO 13818-2 */
/* converting frame_rate_code to frame_rate */
static const double pd_frame_rates[16] =
{
0, 24000.0/1001, 24, 25, 30000.0/1001, 30, 50, 60000.0/1001, 60,
0, 0, 0, 0, 0, 0, 0
};
static int CopyUntilNextStartCode( packetizer_t *p_pack,
sout_buffer_t *p_sout_buffer,
unsigned int *pi_pos )
{
int i_copy = 0;
do
{ {
p_sout_buffer->p_buffer[(*pi_pos)++] = block_Release( p_sys->p_ext );
GetBits( &p_pack->bit_stream, 8 ); }
i_copy++; if( p_sys->p_frame )
{
if( *pi_pos + 2048 > p_sout_buffer->i_buffer_size ) block_Release( p_sys->p_frame );
{ }
sout_BufferRealloc( p_pack->p_sout_input->p_sout, free( p_sys->p_buffer );
p_sout_buffer, free( p_sys );
p_sout_buffer->i_buffer_size + 50 * 1024);
}
} while( ShowBits( &p_pack->bit_stream, 24 ) != 0x01 &&
!p_pack->p_fifo->b_die && !p_pack->p_fifo->b_error );
return( i_copy );
} }
/***************************************************************************** /*****************************************************************************
* PacketizeThread: packetize an unit (here copy a complete pes) * Packetize:
*****************************************************************************/ *****************************************************************************/
static void PacketizeThread( packetizer_t *p_pack ) static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
{ {
sout_buffer_t *p_sout_buffer = NULL; decoder_sys_t *p_sys = p_dec->p_sys;
vlc_bool_t b_seen_slice = VLC_FALSE; block_t *p_chain_out = NULL;
int32_t i_pos; block_t *p_block;
int i_skipped;
mtime_t i_duration; /* of the parsed picture */
mtime_t i_pts = 0;
mtime_t i_dts = 0;
/* needed to calculate pts/dts */
int i_temporal_ref = 0;
int i_picture_coding_type = 0;
int i_picture_structure = 0x03; /* frame picture */
int i_top_field_first = 0;
int i_repeat_first_field = 0;
int i_progressive_frame = 0;
if( !p_pack->p_sout_input )
{
byte_t p_temp[512];/* 150 bytes is the maximal size
of a sequence_header + sequence_extension */
int i_frame_rate_code;
/* skip data until we find a sequence_header_code */
/* TODO: store skipped somewhere so can send it to the mux
* after the input is created */
i_skipped = 0;
while( ShowBits( &p_pack->bit_stream, 32 ) != 0x1B3 &&
!p_pack->p_fifo->b_die && !p_pack->p_fifo->b_error )
{
RemoveBits( &p_pack->bit_stream, 8 );
i_skipped++;
}
msg_Warn( p_pack->p_fifo, "sequence_header_code found (%d skipped)",
i_skipped );
/* copy the start_code */
i_pos = 0;
GetChunk( &p_pack->bit_stream, p_temp, 4 ); i_pos += 4;
/* horizontal_size_value */
p_pack->output_format.video.i_width = ShowBits( &p_pack->bit_stream, 12 );
/* vertical_size_value */
p_pack->output_format.video.i_height= ShowBits( &p_pack->bit_stream, 24 ) & 0xFFF;
/* frame_rate_code */
i_frame_rate_code = ShowBits( &p_pack->bit_stream, 32 ) & 0xF;
/* copy headers */ if( pp_block == NULL || *pp_block == NULL )
GetChunk( &p_pack->bit_stream, p_temp + i_pos, 7 ); i_pos += 7; {
return NULL;
}
p_block = *pp_block;
*pp_block = NULL;
/* intra_quantiser_matrix [non_intra_quantiser_matrix] */ if( p_block->b_discontinuity )
if( ShowBits( &p_pack->bit_stream, 7 ) & 0x1 ) {
{ p_sys->b_frame_corrupted = VLC_TRUE;
}
GetChunk( &p_pack->bit_stream, p_temp + i_pos, 64 ); i_pos += 64; /* Append data */
if( p_sys->i_buffer + p_block->i_buffer > p_sys->i_buffer_size )
{
uint8_t *p_buffer = p_sys->p_buffer;
if( ShowBits( &p_pack->bit_stream, 8 ) & 0x1 ) p_sys->i_buffer_size += p_block->i_buffer + 1024;
{ p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
GetChunk( &p_pack->bit_stream, p_temp + i_pos, 65); i_pos += 65;
}
}
/* non_intra_quantiser_matrix */
else if( ShowBits( &p_pack->bit_stream, 8 ) & 0x1 )
{
GetChunk( &p_pack->bit_stream, p_temp + i_pos, 65); i_pos += 65;
}
/* nothing */
else
{
GetChunk( &p_pack->bit_stream, p_temp + i_pos, 1 ); i_pos += 1;
}
/* sequence_extension (10 bytes) */ if( p_sys->p_start )
if( ShowBits( &p_pack->bit_stream, 32 ) != 0x1B5 )
{ {
msg_Dbg( p_pack->p_fifo, "ARRGG no extension_start_code" ); p_sys->p_start = p_sys->p_start - p_buffer + p_sys->p_buffer;
p_pack->i_progressive_sequence = 1;
p_pack->i_low_delay = 1;
} }
else if( p_sys->p_old )
{ {
GetChunk( &p_pack->bit_stream, p_temp + i_pos, 10 ); p_sys->p_old = p_sys->p_old - p_buffer + p_sys->p_buffer;
p_pack->i_progressive_sequence = ( p_temp[i_pos+5]&0x08 ) ? 1 : 0;
p_pack->i_low_delay = ( p_temp[i_pos+9]&0x80 ) ? 1 : 0;
i_pos += 10;
} }
/* remember sequence_header and sequence_extention */ }
memcpy( p_pack->p_sequence_header, p_temp, i_pos ); memcpy( &p_sys->p_buffer[p_sys->i_buffer], p_block->p_buffer,
p_pack->i_sequence_header_length = i_pos; p_block->i_buffer );
p_sys->i_buffer += p_block->i_buffer;
p_pack->d_frame_rate = pd_frame_rates[i_frame_rate_code];
msg_Warn( p_pack->p_fifo,
"creating input (image size %dx%d, frame rate %.2f)",
p_pack->output_format.video.i_width,
p_pack->output_format.video.i_height,
p_pack->d_frame_rate );
/* now we have informations to create the input */
p_pack->p_sout_input = sout_InputNew( p_pack->p_fifo,
&p_pack->output_format );
if( !p_pack->p_sout_input )
{
msg_Err( p_pack->p_fifo, "cannot add a new stream" );
p_pack->p_fifo->b_error = VLC_TRUE;
return;
}
p_sout_buffer = sout_BufferNew( p_pack->p_sout_input->p_sout,
100 * 1024 );
p_sout_buffer->i_size = i_pos;
memcpy( p_sout_buffer->p_buffer, p_temp, i_pos );
} if( p_sys->i_buffer > 10*1000000 )
else
{ {
p_sout_buffer = msg_Err( p_dec, "mmh reseting context" );
sout_BufferNew( p_pack->p_sout_input->p_sout, 100 * 1024 ); p_sys->i_buffer = 0;
i_pos = 0;
} }
p_pack->i_last_sequence_header++; /* Split data in block */
for( ;; ) for( ;; )
{ {
uint32_t i_code; if( mpgv_FindStartCode( &p_sys->p_start, &p_sys->p_buffer[p_sys->i_buffer] ) )
if( p_pack->p_fifo->b_die || p_pack->p_fifo->b_error )
{ {
break; block_Release( p_block );
}
i_code = ShowBits( &p_pack->bit_stream, 32 );
if( b_seen_slice && ( i_code < 0x101 || i_code > 0x1af ) )
{
break;
}
if( i_code == 0x1B8 ) /* GOP */ if( p_sys->p_seq == NULL )
{
/* usefull for bad MPEG-1 : repeat the sequence_header
every second */
if( p_pack->i_last_sequence_header > (int) p_pack->d_frame_rate )
{ {
memcpy( p_sout_buffer->p_buffer + i_pos, block_ChainRelease( p_chain_out );
p_pack->p_sequence_header, return NULL;
p_pack->i_sequence_header_length );
i_pos += p_pack->i_sequence_header_length;
p_pack->i_last_sequence_header = 0;
} }
p_sout_buffer->i_flags |= SOUT_BUFFER_FLAGS_GOP; return p_chain_out;
CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
} }
else if( i_code == 0x100 ) /* Picture */
{
/* picture_start_code */
GetChunk( &p_pack->bit_stream,
p_sout_buffer->p_buffer + i_pos, 4 ); i_pos += 4;
NextPTS( &p_pack->bit_stream, &i_pts, &i_dts );
i_temporal_ref = ShowBits( &p_pack->bit_stream, 10 );
i_picture_coding_type = ShowBits( &p_pack->bit_stream, 13 ) & 0x3;
CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos ); if( p_sys->p_old )
}
else if( i_code == 0x1b5 )
{ {
/* extention start code 32 */ /* Extract the data */
GetChunk( &p_pack->bit_stream, int i_frag = p_sys->p_start - p_sys->p_old;
p_sout_buffer->p_buffer + i_pos, 4 ); i_pos += 4; block_t *p_frag = block_New( p_dec, i_frag );
if( ShowBits( &p_pack->bit_stream, 4 ) == 0x08 ) memcpy( p_frag->p_buffer, p_sys->p_old, i_frag );
if( i_frag < p_sys->i_buffer )
{ {
/* picture coding extention */ memmove( p_sys->p_buffer, &p_sys->p_buffer[i_frag],
p_sys->i_buffer - i_frag );
/* extention start code identifier(b1000) 4 */
/* f_code[2][2] 16 */
/* intra_dc_precision 2 */
/* picture_structure 2 */
/* top_field_first 1 */
i_picture_structure =
ShowBits( &p_pack->bit_stream, 24 ) & 0x03;
i_top_field_first =
ShowBits( &p_pack->bit_stream, 25 ) & 0x01;
i_repeat_first_field =
ShowBits( &p_pack->bit_stream, 31 ) & 0x01;
GetChunk( &p_pack->bit_stream,
p_sout_buffer->p_buffer + i_pos, 4 ); i_pos += 4;
i_progressive_frame =
ShowBits( &p_pack->bit_stream, 1 ) & 0x01;
} }
CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos ); p_sys->i_buffer -= i_frag;
} p_sys->p_start -= i_frag;
else p_sys->p_old -= i_frag;
{
if( i_code >= 0x101 && i_code <= 0x1af ) if( p_sys->b_frame_slice && ( p_frag->p_buffer[3] == 0x00 || p_frag->p_buffer[3] > 0xaf ) )
{ {
b_seen_slice = VLC_TRUE; /* We have a complete picture output it */
if( p_sys->p_seq == NULL )
{
msg_Dbg( p_dec, "waiting sequence start" );
block_ChainRelease( p_sys->p_frame );
}
else if( p_sys->i_dts <= 0 && p_sys->i_pts <= 0 && p_sys->i_interpolated_dts <= 0 )
{
msg_Dbg( p_dec, "need a starting pts/dts" );
block_ChainRelease( p_sys->p_frame );
}
else if( p_sys->b_frame_corrupted )
{
msg_Warn( p_dec, "trashing a corrupted picture" );
block_ChainRelease( p_sys->p_frame );
p_sys->b_frame_corrupted = VLC_FALSE;
}
else
{
block_t *p_pic = block_ChainGather( p_sys->p_frame );
mtime_t i_duration = (mtime_t)( 1000000 * p_sys->i_frame_rate_base / p_sys->i_frame_rate);
if( !p_sys->b_seq_progressive && p_sys->i_picture_structure != 0x03 )
{
i_duration /= 2;
}
if( p_sys->b_seq_progressive )
{
if( p_sys->i_top_field_first == 0 && p_sys->i_repeat_first_field == 1 )
{
i_duration *= 2;
}
else if( p_sys->i_top_field_first == 1 && p_sys->i_repeat_first_field == 1 )
{
i_duration *= 3;
}
}
else
{
if( p_sys->i_picture_structure == 0x03 )
{
if( p_sys->i_progressive_frame && p_sys->i_repeat_first_field )
{
i_duration += i_duration / 2;
}
}
}
if( p_sys->b_low_delay || p_sys->i_picture_type == 0x03 )
{
/* Trivial case (DTS == PTS) */
/* Correct interpolated dts when we receive a new pts/dts */
if( p_sys->i_pts > 0 ) p_sys->i_interpolated_dts = p_sys->i_pts;
if( p_sys->i_dts > 0 ) p_sys->i_interpolated_dts = p_sys->i_dts;
}
else
{
/* Correct interpolated dts when we receive a new pts/dts */
if( p_sys->i_last_ref_pts > 0 )
p_sys->i_interpolated_dts = p_sys->i_last_ref_pts;
if( p_sys->i_dts > 0 ) p_sys->i_interpolated_dts = p_sys->i_dts;
p_sys->i_last_ref_pts = p_sys->i_pts;
}
p_pic->i_dts = p_sys->i_interpolated_dts;
/* Set PTS only if I frame or come from stream */
if( p_sys->i_pts > 0 )
{
p_pic->i_pts = p_sys->i_pts;
}
else if( p_sys->i_picture_type == 0x03 )
{
p_pic->i_pts = p_pic->i_dts;
}
else
{
p_pic->i_pts = -1;
}
if( p_sys->b_low_delay || p_sys->i_picture_type == 0x03 )
{
/* Trivial case (DTS == PTS) */
p_sys->i_interpolated_dts += i_duration;
}
else
{
p_sys->i_interpolated_dts += p_sys->i_old_duration;
p_sys->i_old_duration = i_duration;
}
p_pic->i_length = p_sys->i_interpolated_dts - p_pic->i_dts;
//msg_Dbg( p_dec, "pic: type=%d dts=%lld pts-dts=%lld", p_sys->i_picture_type, p_pic->i_dts, p_pic->i_pts - p_pic->i_dts);
block_ChainAppend( &p_chain_out, p_pic );
}
/* reset context */
p_sys->p_frame = NULL;
p_sys->b_frame_slice = VLC_FALSE;
p_sys->b_gop = VLC_FALSE;
p_sys->i_pts = 0;
p_sys->i_dts = 0;
} }
if( i_code == 0x1B3 ) if( p_frag->p_buffer[3] == 0xb8 )
{ {
p_pack->i_last_sequence_header = 0; if( p_sys->p_seq &&
p_sys->i_seq_old > p_sys->i_frame_rate/p_sys->i_frame_rate_base )
{
/* Usefull for mpeg1: repeat sequence header every second */
block_ChainAppend( &p_sys->p_frame,
block_Duplicate( p_sys->p_seq ) );
if( p_sys->p_ext )
{
block_ChainAppend( &p_sys->p_frame,
block_Duplicate( p_sys->p_ext ) );
}
p_sys->i_seq_old = 0;
}
p_sys->b_gop = VLC_TRUE;
} }
CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos ); else if( p_frag->p_buffer[3] == 0xb3 )
}
}
if( i_pts <= 0 && i_dts <= 0 && p_pack->i_interpolated_dts <= 0 )
{
msg_Dbg( p_pack->p_fifo, "need a starting pts/dts" );
sout_BufferDelete( p_pack->p_sout_input->p_sout, p_sout_buffer );
return;
}
sout_BufferRealloc( p_pack->p_sout_input->p_sout,
p_sout_buffer, i_pos );
p_sout_buffer->i_size = i_pos;
/* calculate frame duration */
if( p_pack->i_progressive_sequence || i_picture_structure == 0x03)
{
i_duration = (mtime_t)( 1000000 / p_pack->d_frame_rate );
}
else
{
i_duration = (mtime_t)( 1000000 / p_pack->d_frame_rate / 2);
}
if( p_pack->i_progressive_sequence )
{
if( i_top_field_first == 0 && i_repeat_first_field == 1 )
{
i_duration = 2 * i_duration;
}
else if( i_top_field_first == 1 && i_repeat_first_field == 1 )
{
i_duration = 3 * i_duration;
}
}
else
{
if( i_picture_structure == 0x03 )
{
if( i_progressive_frame && i_repeat_first_field )
{ {
i_duration += i_duration / 2; static const int code_to_frame_rate[16][2] =
{
{ 1, 1 }, /* invalid */
{ 24000, 1001 }, { 24, 1 }, { 25, 1 }, { 30000, 1001 },
{ 30, 1 }, { 50, 1 }, { 60000, 1001 }, { 60, 1 },
{ 1, 1 }, { 1, 1 }, { 1, 1 }, { 1, 1 }, /* invalid */
{ 1, 1 }, { 1, 1 }, { 1, 1 } /* invalid */
};
/* sequence header */
if( p_sys->p_seq )
{
block_Release( p_sys->p_seq );
}
if( p_sys->p_ext )
{
block_Release( p_sys->p_ext );
p_sys->p_ext = NULL;
}
p_sys->p_seq = block_Duplicate( p_frag );
p_sys->i_seq_old = 0;
p_dec->fmt_out.video.i_width = ( p_frag->p_buffer[4] << 4)|(p_frag->p_buffer[5] >> 4 );
p_dec->fmt_out.video.i_height= ( (p_frag->p_buffer[5]&0x0f) << 8 )|p_frag->p_buffer[6];
p_sys->i_frame_rate = code_to_frame_rate[p_frag->p_buffer[7]&0x0f][0];
p_sys->i_frame_rate_base = code_to_frame_rate[p_frag->p_buffer[7]&0x0f][1];
p_sys->b_seq_progressive = VLC_TRUE;
p_sys->b_low_delay = VLC_TRUE;
msg_Dbg( p_dec, "Size %dx%d fps=%.3f",
p_dec->fmt_out.video.i_width,
p_dec->fmt_out.video.i_height,
(float)p_sys->i_frame_rate / (float)p_sys->i_frame_rate_base );
}
else if( p_frag->p_buffer[3] == 0xb5 )
{
int i_type = p_frag->p_buffer[4] >> 4;
/* extention start code */
if( i_type == 0x01 )
{
/* sequence extention */
if( p_sys->p_ext)
{
block_Release( p_sys->p_ext );
}
p_sys->p_ext = block_Duplicate( p_frag );
if( p_frag->i_buffer >= 10 )
{
p_sys->b_seq_progressive = p_frag->p_buffer[5]&0x08 ? VLC_TRUE : VLC_FALSE;
p_sys->b_low_delay = p_frag->p_buffer[9]&0x80 ? VLC_TRUE : VLC_FALSE;
}
}
else if( i_type == 0x08 )
{
/* picture extention */
p_sys->i_picture_structure = p_frag->p_buffer[6]&0x03;
p_sys->i_top_field_first = p_frag->p_buffer[7] >> 7;
p_sys->i_repeat_first_field= (p_frag->p_buffer[7]>>1)&0x01;
p_sys->i_progressive_frame = p_frag->p_buffer[8] >> 7;
}
}
else if( p_frag->p_buffer[3] == 0x00 )
{
/* picture */
p_sys->i_seq_old++;
if( p_frag->i_buffer >= 6 )
{
p_sys->i_temporal_ref = ( p_frag->p_buffer[4] << 2 )|(p_frag->p_buffer[5] >> 6);
p_sys->i_picture_type = ( p_frag->p_buffer[5] >> 3 )&0x03;
}
if( !p_sys->b_frame_slice )
{
p_sys->i_dts = p_block->i_dts; p_block->i_dts = 0;
p_sys->i_pts = p_block->i_pts; p_block->i_pts = 0;
}
}
else if( p_frag->p_buffer[3] >= 0x01 && p_frag->p_buffer[3] <= 0xaf )
{
/* Slice */
p_sys->b_frame_slice = VLC_TRUE;
} }
}
}
if( p_pack->i_low_delay || i_picture_coding_type == 0x03 )
{
/* Trivial case (DTS == PTS) */
/* Correct interpolated dts when we receive a new pts/dts */
if( i_pts > 0 ) p_pack->i_interpolated_dts = i_pts;
if( i_dts > 0 ) p_pack->i_interpolated_dts = i_dts;
}
else
{
/* Correct interpolated dts when we receive a new pts/dts */
if( p_pack->i_last_ref_pts )
p_pack->i_interpolated_dts = p_pack->i_last_ref_pts;
if( i_dts > 0 ) p_pack->i_interpolated_dts = i_dts;
p_pack->i_last_ref_pts = i_pts;
}
/* Don't even try to calculate the PTS unless it is given in the
* original stream */
p_sout_buffer->i_pts = i_pts ? i_pts : -1;
p_sout_buffer->i_dts = p_pack->i_interpolated_dts;
if( p_pack->i_low_delay || i_picture_coding_type == 0x03 )
{
/* Trivial case (DTS == PTS) */
p_pack->i_interpolated_dts += i_duration;
}
else
{
p_pack->i_interpolated_dts += p_pack->i_old_duration;
p_pack->i_old_duration = i_duration;
}
p_sout_buffer->i_length = p_pack->i_interpolated_dts -
p_sout_buffer->i_dts;
p_sout_buffer->i_bitrate = (int)( 8 * i_pos * p_pack->d_frame_rate );
#if 0
msg_Dbg( p_pack->p_fifo, "------------> dts=%lld pts=%lld duration=%lld",
p_sout_buffer->i_dts, p_sout_buffer->i_pts,
p_sout_buffer->i_length );
#endif
if ( p_pack->b_expect_discontinuity )
{
msg_Warn( p_pack->p_fifo, "discontinuity encountered, dropping a frame" );
p_pack->b_expect_discontinuity = 0;
sout_BufferDelete( p_pack->p_sout_input->p_sout, p_sout_buffer );
}
else
{
sout_InputSendBuffer( p_pack->p_sout_input, p_sout_buffer );
}
}
/***************************************************************************** /* Append the block */
* EndThread : packetizer thread destruction block_ChainAppend( &p_sys->p_frame, p_frag );
*****************************************************************************/ }
static void EndThread ( packetizer_t *p_pack) p_sys->p_old = p_sys->p_start;
{ p_sys->p_start += 4;
if( p_pack->p_sout_input )
{
sout_InputDelete( p_pack->p_sout_input );
} }
} }
/***************************************************************************** static int mpgv_FindStartCode( uint8_t **pp_start, uint8_t *p_end )
* BitstreamCallback: Import parameters from the new data/PES packet
*****************************************************************************
* This function is called by input's NextDataPacket.
*****************************************************************************/
static void BitstreamCallback ( bit_stream_t * p_bit_stream,
vlc_bool_t b_new_pes )
{ {
packetizer_t * p_pack = (packetizer_t *)p_bit_stream->p_callback_arg; uint8_t *p = *pp_start;
if( p_bit_stream->p_data->b_discard_payload for( p = *pp_start; p < p_end - 4; p++ )
|| (b_new_pes && p_bit_stream->p_pes->b_discontinuity) )
{ {
p_pack->b_expect_discontinuity = 1; if( p[0] == 0 && p[1] == 0 && p[2] == 1 )
{
*pp_start = p;
return VLC_SUCCESS;
}
} }
*pp_start = p;
return VLC_EGENERIC;
} }
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment