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Commit 59dfb394 authored by Gildas Bazin's avatar Gildas Bazin
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* include/vlc_block_helper.h: new block_FindStartcodeFromOffset() function.
* modules/packetizer/mpegvideo.c: rewrote the packetizer to use the block helper functions.
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include/vlc_block_helper.h
View file @ 59dfb394
...@@ -2,7 +2,7 @@ ...@@ -2,7 +2,7 @@
* vlc_block_helper.h: Helper functions for data blocks management. * vlc_block_helper.h: Helper functions for data blocks management.
***************************************************************************** *****************************************************************************
* Copyright (C) 2003 VideoLAN * Copyright (C) 2003 VideoLAN
* $Id: vlc_block_helper.h,v 1.5 2003/11/16 21:07:30 gbazin Exp $ * $Id: vlc_block_helper.h,v 1.6 2003/12/06 23:25:23 gbazin Exp $
* *
* Authors: Gildas Bazin <gbazin@netcourrier.com> * Authors: Gildas Bazin <gbazin@netcourrier.com>
* *
...@@ -436,4 +436,72 @@ static inline int block_PeekOffsetBytes( block_bytestream_t *p_bytestream, ...@@ -436,4 +436,72 @@ static inline int block_PeekOffsetBytes( block_bytestream_t *p_bytestream,
return VLC_SUCCESS; return VLC_SUCCESS;
} }
static inline int block_FindStartcodeFromOffset(
block_bytestream_t *p_bytestream, int *pi_offset,
uint8_t *p_startcode, int i_startcode_length )
{
block_t *p_block, *p_block_backup = 0;
int i_size, i_offset, i_offset_backup = 0;
int i_caller_offset_backup = 0, i_match;
/* Find the right place */
i_size = *pi_offset + p_bytestream->i_offset;
for( p_block = p_bytestream->p_block;
p_block != NULL; p_block = p_block->p_next )
{
i_size -= p_block->i_buffer;
if( i_size < 0 ) break;
}
if( i_size >= 0 )
{
/* Not enough data, bail out */
return VLC_EGENERIC;
}
/* Begin the search.
* We first look for an occurence of the 1st startcode byte and
* if found, we do a more thorough check. */
i_size = p_block->i_buffer + i_size;
*pi_offset -= i_size;
i_match = 0;
for( ; p_block != NULL; p_block = p_block->p_next )
{
for( i_offset = i_size; i_offset < p_block->i_buffer; i_offset++ )
{
if( p_block->p_buffer[i_offset] == p_startcode[i_match] )
{
if( !i_match )
{
p_block_backup = p_block;
i_offset_backup = i_offset;
i_caller_offset_backup = *pi_offset;
}
if( i_match + 1 == i_startcode_length )
{
/* We have it */
*pi_offset += i_offset - i_match;
return VLC_SUCCESS;
}
i_match++;
}
else if ( i_match )
{
/* False positive */
p_block = p_block_backup;
i_offset = i_offset_backup;
*pi_offset = i_caller_offset_backup;
i_match = 0;
}
}
i_size = 0;
*pi_offset += i_offset;
}
return VLC_EGENERIC;
}
#endif /* VLC_BLOCK_HELPER_H */ #endif /* VLC_BLOCK_HELPER_H */
modules/packetizer/mpegvideo.c
View file @ 59dfb394
/***************************************************************************** /*****************************************************************************
* mpegvideo.c * mpegvideo.c: parse and packetize an MPEG1/2 video stream
***************************************************************************** *****************************************************************************
* Copyright (C) 2001, 2002 VideoLAN * Copyright (C) 2001, 2002 VideoLAN
* $Id: mpegvideo.c,v 1.23 2003/11/27 22:44:50 massiot Exp $ * $Id: mpegvideo.c,v 1.24 2003/12/06 23:25:23 gbazin 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>
* Gildas Bazin <gbazin@netcourrier.com>
* *
* This program is free software; you can redistribute it and/or modify * This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by * it under the terms of the GNU General Public License as published by
...@@ -45,6 +46,8 @@ ...@@ -45,6 +46,8 @@
#include <vlc/decoder.h> #include <vlc/decoder.h>
#include <vlc/input.h> #include <vlc/input.h>
#include "vlc_block_helper.h"
/***************************************************************************** /*****************************************************************************
* Module descriptor * Module descriptor
*****************************************************************************/ *****************************************************************************/
...@@ -57,43 +60,40 @@ vlc_module_begin(); ...@@ -57,43 +60,40 @@ vlc_module_begin();
set_callbacks( Open, Close ); set_callbacks( Open, Close );
vlc_module_end(); vlc_module_end();
/***************************************************************************** /*****************************************************************************
* Local prototypes * Local prototypes
*****************************************************************************/ *****************************************************************************/
static block_t *Packetize( decoder_t *, block_t ** ); static block_t *Packetize( decoder_t *, block_t ** );
static block_t *ParseMPEGBlock( decoder_t *, block_t * );
static int mpgv_FindStartCode( uint8_t **pp_start, uint8_t *p_end );
struct decoder_sys_t struct decoder_sys_t
{ {
/* sequence header and extention */ /*
* Input properties
*/
block_bytestream_t bytestream;
int i_state;
int i_offset;
uint8_t p_startcode[3];
/* Sequence header and extention */
block_t *p_seq; block_t *p_seq;
block_t *p_ext; block_t *p_ext;
/* current frame being building */ /* Current frame being built */
block_t *p_frame; block_t *p_frame;
vlc_bool_t b_frame_slice; 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_pts;
mtime_t i_dts; mtime_t i_dts;
/* gathering buffer */ /* Sequence properties */
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;
int i_frame_rate_base; int i_frame_rate_base;
vlc_bool_t b_seq_progressive; vlc_bool_t b_seq_progressive;
vlc_bool_t b_low_delay; vlc_bool_t b_low_delay;
int i_aspect_ratio_info;
/* */ /* Picture properties */
int i_temporal_ref; int i_temporal_ref;
int i_picture_type; int i_picture_type;
int i_picture_structure; int i_picture_structure;
...@@ -101,14 +101,18 @@ struct decoder_sys_t ...@@ -101,14 +101,18 @@ struct decoder_sys_t
int i_repeat_first_field; int i_repeat_first_field;
int i_progressive_frame; int i_progressive_frame;
/* */
int i_seq_old; /* How many picture from last seq */
/* */
mtime_t i_interpolated_dts; mtime_t i_interpolated_dts;
mtime_t i_old_duration; mtime_t i_old_duration;
mtime_t i_last_ref_pts; mtime_t i_last_ref_pts;
/* Number of pictues since last sequence header */
int i_seq_old;
};
enum {
STATE_NOSYNC,
STATE_NEXT_SYNC
}; };
/***************************************************************************** /*****************************************************************************
...@@ -126,26 +130,25 @@ static int Open( vlc_object_t *p_this ) ...@@ -126,26 +130,25 @@ static int Open( vlc_object_t *p_this )
return VLC_EGENERIC; return VLC_EGENERIC;
} }
es_format_Init( &p_dec->fmt_out, VIDEO_ES, VLC_FOURCC( 'm', 'p', 'g', 'v' ) ); es_format_Init( &p_dec->fmt_out, VIDEO_ES, VLC_FOURCC('m','p','g','v') );
p_dec->pf_packetize = Packetize; p_dec->pf_packetize = Packetize;
p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) ); p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
/* Misc init */
p_sys->i_state = STATE_NOSYNC;
p_sys->bytestream = block_BytestreamInit( p_dec );
p_sys->p_startcode[0] = 0;
p_sys->p_startcode[1] = 0;
p_sys->p_startcode[2] = 1;
p_sys->i_offset = 0;
p_sys->p_seq = NULL; p_sys->p_seq = NULL;
p_sys->p_ext = NULL; p_sys->p_ext = NULL;
p_sys->p_frame = NULL; p_sys->p_frame = NULL;
p_sys->b_frame_slice = VLC_FALSE; 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_dts = p_sys->i_pts = 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;
p_sys->i_dts = 0;
p_sys->i_pts = 0;
p_sys->i_frame_rate = 1; p_sys->i_frame_rate = 1;
p_sys->i_frame_rate_base = 1; p_sys->i_frame_rate_base = 1;
...@@ -175,6 +178,8 @@ static void Close( vlc_object_t *p_this ) ...@@ -175,6 +178,8 @@ static void Close( vlc_object_t *p_this )
decoder_t *p_dec = (decoder_t*)p_this; decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys = p_dec->p_sys; decoder_sys_t *p_sys = p_dec->p_sys;
block_BytestreamRelease( &p_sys->bytestream );
if( p_sys->p_seq ) if( p_sys->p_seq )
{ {
block_Release( p_sys->p_seq ); block_Release( p_sys->p_seq );
...@@ -185,9 +190,9 @@ static void Close( vlc_object_t *p_this ) ...@@ -185,9 +190,9 @@ static void Close( vlc_object_t *p_this )
} }
if( p_sys->p_frame ) if( p_sys->p_frame )
{ {
block_Release( p_sys->p_frame ); block_ChainRelease( p_sys->p_frame );
} }
free( p_sys->p_buffer );
free( p_sys ); free( p_sys );
} }
...@@ -197,323 +202,356 @@ static void Close( vlc_object_t *p_this ) ...@@ -197,323 +202,356 @@ static void Close( vlc_object_t *p_this )
static block_t *Packetize( decoder_t *p_dec, block_t **pp_block ) static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
{ {
decoder_sys_t *p_sys = p_dec->p_sys; decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_chain_out = NULL; block_t *p_pic;
block_t *p_block;
if( pp_block == NULL || *pp_block == NULL ) if( pp_block == NULL || *pp_block == NULL )
{ {
return NULL; return NULL;
} }
p_block = *pp_block;
*pp_block = NULL;
if( p_block->b_discontinuity ) if( (*pp_block)->b_discontinuity )
{ {
p_sys->b_frame_corrupted = VLC_TRUE; p_sys->i_state = STATE_NOSYNC;
if( p_sys->p_frame ) block_ChainRelease( p_sys->p_frame );
p_sys->p_frame = NULL;
p_sys->b_frame_slice = VLC_FALSE;
} }
/* Append data */ block_BytestreamPush( &p_sys->bytestream, *pp_block );
if( p_sys->i_buffer + p_block->i_buffer > p_sys->i_buffer_size )
{
uint8_t *p_buffer = p_sys->p_buffer;
p_sys->i_buffer_size += p_block->i_buffer + 1024;
p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
if( p_sys->p_start ) while( 1 )
{ {
p_sys->p_start = p_sys->p_start - p_buffer + p_sys->p_buffer; switch( p_sys->i_state )
}
if( p_sys->p_old )
{ {
p_sys->p_old = p_sys->p_old - p_buffer + p_sys->p_buffer;
}
} case STATE_NOSYNC:
memcpy( &p_sys->p_buffer[p_sys->i_buffer], p_block->p_buffer, if( block_FindStartcodeFromOffset( &p_sys->bytestream,
p_block->i_buffer ); &p_sys->i_offset, p_sys->p_startcode, 3 ) == VLC_SUCCESS )
p_sys->i_buffer += p_block->i_buffer; {
p_sys->i_state = STATE_NEXT_SYNC;
}
if( p_sys->i_offset )
{
block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
p_sys->i_offset = 0;
block_BytestreamFlush( &p_sys->bytestream );
}
if( p_sys->i_buffer > 10*1000000 ) if( p_sys->i_state != STATE_NEXT_SYNC )
{ {
msg_Err( p_dec, "mmh reseting context" ); /* Need more data */
p_sys->i_buffer = 0; return NULL;
} }
/* Split data in block */ p_sys->i_offset = 1; /* To find next startcode */
for( ;; )
{ case STATE_NEXT_SYNC:
if( mpgv_FindStartCode( &p_sys->p_start, &p_sys->p_buffer[p_sys->i_buffer] ) ) /* TODO: If p_block == NULL, flush the buffer without checking the
{ * next sync word */
block_Release( p_block );
if( p_sys->p_seq == NULL ) /* Find the next startcode */
if( block_FindStartcodeFromOffset( &p_sys->bytestream,
&p_sys->i_offset, p_sys->p_startcode, 3 ) != VLC_SUCCESS )
{ {
block_ChainRelease( p_chain_out ); /* Need more data */
return NULL; return NULL;
} }
return p_chain_out;
}
if( p_sys->p_old ) /* Get the new fragment and set the pts/dts */
{ p_pic = block_New( p_dec, p_sys->i_offset );
/* Extract the data */ p_pic->i_pts = p_sys->bytestream.p_block->i_pts;
int i_frag = p_sys->p_start - p_sys->p_old; p_pic->i_dts = p_sys->bytestream.p_block->i_dts;
block_t *p_frag = block_New( p_dec, i_frag );
memcpy( p_frag->p_buffer, p_sys->p_old, i_frag ); block_GetBytes( &p_sys->bytestream, p_pic->p_buffer,
if( i_frag < p_sys->i_buffer ) p_pic->i_buffer );
/* don't reuse the same timestamps several times */
if( p_pic->i_buffer >= 4 && p_pic->p_buffer[3] == 0x00 )
{ {
memmove( p_sys->p_buffer, &p_sys->p_buffer[i_frag], /* We have a picture start code */
p_sys->i_buffer - i_frag ); p_sys->bytestream.p_block->i_pts = 0;
p_sys->bytestream.p_block->i_dts = 0;
} }
p_sys->i_buffer -= i_frag;
p_sys->p_start -= i_frag;
p_sys->p_old -= i_frag;
if( p_sys->b_frame_slice && ( p_frag->p_buffer[3] == 0x00 || p_frag->p_buffer[3] > 0xaf ) ) p_sys->i_offset = 0;
{
/* 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 );
} /* Get picture if any */
if( !( p_pic = ParseMPEGBlock( p_dec, p_pic ) ) )
{
p_sys->i_state = STATE_NOSYNC;
break;
}
/* reset context */ /* We've just started the stream, wait for the first PTS.
p_sys->p_frame = NULL; * We discard here so we can still get the sequence header. */
p_sys->b_frame_slice = VLC_FALSE; if( p_sys->i_dts <= 0 && p_sys->i_pts <= 0 &&
p_sys->b_gop = VLC_FALSE; p_sys->i_interpolated_dts <= 0 )
p_sys->i_pts = 0; {
p_sys->i_dts = 0; msg_Dbg( p_dec, "need a starting pts/dts" );
p_sys->i_state = STATE_NOSYNC;
block_Release( p_pic );
break;
} }
if( p_frag->p_buffer[3] == 0xb8 ) /* So p_block doesn't get re-added several times */
*pp_block = block_BytestreamPop( &p_sys->bytestream );
p_sys->i_state = STATE_NOSYNC;
return p_pic;
}
}
}
/*****************************************************************************
* ParseMPEGBlock: Re-assemble fragments into a block containing a picture
*****************************************************************************/
static block_t *ParseMPEGBlock( decoder_t *p_dec, block_t *p_frag )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_pic = NULL;
/*
* Check if previous picture is finished
*/
if( ( p_sys->b_frame_slice &&
(p_frag->p_buffer[3] == 0x00 || p_frag->p_buffer[3] > 0xaf) ) &&
p_sys->p_seq == NULL )
{
/* We have a picture but without a sequence header we can't
* do anything */
msg_Dbg( p_dec, "waiting for sequence start" );
if( p_sys->p_frame ) block_ChainRelease( p_sys->p_frame );
p_sys->p_frame = NULL;
p_sys->b_frame_slice = VLC_FALSE;
}
else if( p_sys->b_frame_slice &&
(p_frag->p_buffer[3] == 0x00 || p_frag->p_buffer[3] > 0xaf) )
{
mtime_t i_duration;
p_pic = block_ChainGather( p_sys->p_frame );
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 )
{ {
if( p_sys->p_seq && i_duration *= 2;
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;
} }
else if( p_frag->p_buffer[3] == 0xb3 ) else if( p_sys->i_top_field_first == 1 &&
p_sys->i_repeat_first_field == 1 )
{ {
static const int code_to_frame_rate[16][2] = i_duration *= 3;
{ }
{ 1, 1 }, /* invalid */ }
{ 24000, 1001 }, { 24, 1 }, { 25, 1 }, { 30000, 1001 }, else
{ 30, 1 }, { 50, 1 }, { 60000, 1001 }, { 60, 1 }, {
{ 1, 1 }, { 1, 1 }, { 1, 1 }, { 1, 1 }, /* invalid */ if( p_sys->i_picture_structure == 0x03 )
{ 1, 1 }, { 1, 1 }, { 1, 1 } /* invalid */ {
}; if( p_sys->i_progressive_frame && p_sys->i_repeat_first_field )
/* sequence header */
if( p_sys->p_seq )
{
block_Release( p_sys->p_seq );
}
if( p_sys->p_ext )
{ {
block_Release( p_sys->p_ext ); i_duration += i_duration / 2;
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 ); if( p_sys->b_low_delay || p_sys->i_picture_type == 0x03 )
p_dec->fmt_out.video.i_height= ( (p_frag->p_buffer[5]&0x0f) << 8 )|p_frag->p_buffer[6]; {
/* 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_frame_rate = code_to_frame_rate[p_frag->p_buffer[7]&0x0f][0]; p_sys->i_last_ref_pts = p_sys->i_pts;
p_sys->i_frame_rate_base = code_to_frame_rate[p_frag->p_buffer[7]&0x0f][1]; }
p_pic->i_dts = p_sys->i_interpolated_dts;
p_sys->b_seq_progressive = VLC_TRUE; /* Set PTS only if we have a B frame or if it comes from the stream */
p_sys->b_low_delay = VLC_TRUE; 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 = 0;
}
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;
#if 0 #if 0
msg_Dbg( p_dec, "Size %dx%d fps=%.3f", msg_Dbg( p_dec, "pic: type=%d dts="I64Fd" pts-dts="I64Fd,
p_dec->fmt_out.video.i_width, p_sys->i_picture_type, p_pic->i_dts, p_pic->i_pts - p_pic->i_dts);
p_dec->fmt_out.video.i_height,
(float)p_sys->i_frame_rate / (float)p_sys->i_frame_rate_base );
#endif #endif
}
else if( p_frag->p_buffer[3] == 0xb5 ) /* Reset context */
p_sys->p_frame = NULL;
p_sys->b_frame_slice = VLC_FALSE;
}
/*
* Check info of current fragment
*/
if( p_frag->p_buffer[3] == 0xb8 )
{
/* Group start code */
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 )
{ {
int i_type = p_frag->p_buffer[4] >> 4; block_ChainAppend( &p_sys->p_frame,
/* extention start code */ block_Duplicate( p_sys->p_ext ) );
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 )
p_sys->i_seq_old = 0;
}
}
else if( p_frag->p_buffer[3] == 0xb3 && p_frag->i_buffer >= 8 )
{
/* Sequence header code */
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 },
/* Unofficial 15fps from Xing*/
{ 15, 1001 },
/* Unofficial economy rates from libmpeg3 */
{ 5, 1001 }, { 10, 1001 }, { 12, 1001 }, { 15, 1001 },
{ 1, 1 }, { 1, 1 } /* invalid */
};
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_seq = block_Duplicate( p_frag );
p_sys->i_seq_old = 0;
p_sys->p_ext = NULL;
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_aspect_ratio_info = p_frag->p_buffer[7] >> 4;
/* TODO: MPEG1 aspect ratio */
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;
#if 0
msg_Dbg( p_dec, "Size %dx%d fps=%.3f",
p_dec->fmt_out.video.i_width, p_dec->fmt_out.video.i_height,
p_sys->i_frame_rate / (float)p_sys->i_frame_rate_base );
#endif
}
else if( p_frag->p_buffer[3] == 0xb5 )
{
int i_type = p_frag->p_buffer[4] >> 4;
/* Extention start code */
if( i_type == 0x01 )
{
static const int mpeg2_aspect[16][2] =
{ {
/* picture */ {0,1}, {1,1}, {4,3}, {16,9}, {221,100},
p_sys->i_seq_old++; {0,1}, {0,1}, {0,1}, {0,1}, {0,1}, {0,1}, {0,1}, {0,1}, {0,1},
{0,1}, {0,1}
};
if( p_frag->i_buffer >= 6 ) /* sequence extention */
{ if( p_sys->p_ext) block_Release( p_sys->p_ext );
p_sys->i_temporal_ref = ( p_frag->p_buffer[4] << 2 )|(p_frag->p_buffer[5] >> 6); p_sys->p_ext = block_Duplicate( p_frag );
p_sys->i_picture_type = ( p_frag->p_buffer[5] >> 3 )&0x03;
} if( p_frag->i_buffer >= 10 )
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_seq_progressive =
p_sys->b_frame_slice = VLC_TRUE; 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;
} }
/* Append the block */ #if 0
block_ChainAppend( &p_sys->p_frame, p_frag ); p_dec->fmt_out.video.i_aspect =
mpeg2_aspect[p_sys->i_aspect_ratio_info][0] *
VOUT_ASPECT_FACTOR /
mpeg2_aspect[p_sys->i_aspect_ratio_info][1];
#endif
}
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;
} }
p_sys->p_old = p_sys->p_start;
p_sys->p_start += 4;
} }
} else if( p_frag->p_buffer[3] == 0x00 )
static int mpgv_FindStartCode( uint8_t **pp_start, uint8_t *p_end )
{
uint8_t *p = *pp_start;
for( p = *pp_start; p < p_end - 4; p++ )
{ {
if( p[0] == 0 && p[1] == 0 && p[2] == 1 ) /* Picture start code */
p_sys->i_seq_old++;
if( p_frag->i_buffer >= 6 )
{ {
*pp_start = p; p_sys->i_temporal_ref =
return VLC_SUCCESS; ( p_frag->p_buffer[4] << 2 )|(p_frag->p_buffer[5] >> 6);
p_sys->i_picture_type = ( p_frag->p_buffer[5] >> 3 ) & 0x03;
} }
}
*pp_start = p; p_sys->i_dts = p_frag->i_dts;
return VLC_EGENERIC; p_sys->i_pts = p_frag->i_pts;
} }
else if( p_frag->p_buffer[3] >= 0x01 && p_frag->p_buffer[3] <= 0xaf )
{
/* Slice start code */
p_sys->b_frame_slice = VLC_TRUE;
}
/* Append the block */
block_ChainAppend( &p_sys->p_frame, p_frag );
return p_pic;
}
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