/*****************************************************************************
- * mpegvideo.c
+ * mpegvideo.c: parse and packetize an MPEG1/2 video stream
*****************************************************************************
- * Copyright (C) 2001, 2002 VideoLAN
- * $Id: mpegvideo.c,v 1.22 2003/11/22 16:53:02 fenrir Exp $
+ * Copyright (C) 2001-2006 the VideoLAN team
+ * $Id$
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
* Eric Petit <titer@videolan.org>
+ * Gildas Bazin <gbazin@videolan.org>
+ * Jean-Paul Saman <jpsaman #_at_# m2x dot nl>
*
* 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
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
/*****************************************************************************
* Preamble
*****************************************************************************/
-#include <stdlib.h> /* malloc(), free() */
#include <vlc/vlc.h>
-#include <vlc/decoder.h>
-#include <vlc/input.h>
+#include <vlc_block.h>
+#include <vlc_codec.h>
+#include <vlc_block_helper.h>
+
+#define SYNC_INTRAFRAME_TEXT N_("Sync on Intra Frame")
+#define SYNC_INTRAFRAME_LONGTEXT N_("Normally the packetizer would " \
+ "sync on the next full frame. This flags instructs the packetizer " \
+ "to sync on the first Intra Frame found.")
/*****************************************************************************
* Module descriptor
static void Close( vlc_object_t * );
vlc_module_begin();
+ set_category( CAT_SOUT );
+ set_subcategory( SUBCAT_SOUT_PACKETIZER );
set_description( _("MPEG-I/II video packetizer") );
set_capability( "packetizer", 50 );
set_callbacks( Open, Close );
-vlc_module_end();
+ add_bool( "packetizer-mpegvideo-sync-iframe", 0, NULL, SYNC_INTRAFRAME_TEXT,
+ SYNC_INTRAFRAME_LONGTEXT, VLC_TRUE );
+vlc_module_end();
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static block_t *Packetize( decoder_t *, block_t ** );
-
-static int mpgv_FindStartCode( uint8_t **pp_start, uint8_t *p_end );
+static block_t *ParseMPEGBlock( decoder_t *, block_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 extension */
block_t *p_seq;
block_t *p_ext;
- /* current frame being building */
+ /* Current frame being built */
block_t *p_frame;
- vlc_bool_t b_frame_slice;
- vlc_bool_t b_frame_corrupted;
- vlc_bool_t b_gop;
+ block_t **pp_last;
- /* pts of current picture */
+ vlc_bool_t b_frame_slice;
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;
-
- /* */
+ /* Sequence properties */
int i_frame_rate;
int i_frame_rate_base;
vlc_bool_t b_seq_progressive;
vlc_bool_t b_low_delay;
+ int i_aspect_ratio_info;
+ vlc_bool_t b_inited;
- /* */
+ /* Picture properties */
int i_temporal_ref;
int i_picture_type;
int i_picture_structure;
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;
+ vlc_bool_t b_second_field;
+
+ /* Number of pictures since last sequence header */
+ int i_seq_old;
+
+ /* Sync behaviour */
+ vlc_bool_t b_sync_on_intra_frame;
+ vlc_bool_t b_discontinuity;
+};
+
+enum {
+ STATE_NOSYNC,
+ STATE_NEXT_SYNC
};
/*****************************************************************************
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->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_ext = NULL;
p_sys->p_frame = NULL;
+ p_sys->pp_last = &p_sys->p_frame;
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;
-
- p_sys->i_dts = 0;
- p_sys->i_pts = 0;
+ p_sys->i_dts = p_sys->i_pts = 0;
p_sys->i_frame_rate = 1;
p_sys->i_frame_rate_base = 1;
p_sys->i_top_field_first = 0;
p_sys->i_repeat_first_field = 0;
p_sys->i_progressive_frame = 0;
+ p_sys->b_inited = 0;
p_sys->i_interpolated_dts = 0;
- p_sys->i_old_duration = 0;
p_sys->i_last_ref_pts = 0;
+ p_sys->b_second_field = 0;
+
+ p_sys->b_discontinuity = VLC_FALSE;
+ p_sys->b_sync_on_intra_frame = var_CreateGetBool( p_dec, "packetizer-mpegvideo-sync-iframe" );
+ if( p_sys->b_sync_on_intra_frame )
+ msg_Dbg( p_dec, "syncing on intra frame now" );
return VLC_SUCCESS;
}
decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys = p_dec->p_sys;
+ block_BytestreamRelease( &p_sys->bytestream );
+
if( p_sys->p_seq )
{
block_Release( p_sys->p_seq );
}
if( p_sys->p_frame )
{
- block_Release( p_sys->p_frame );
+ block_ChainRelease( p_sys->p_frame );
}
- free( p_sys->p_buffer );
+
+ var_Destroy( p_dec, "packetizer-mpegvideo-sync-iframe" );
+
free( p_sys );
}
static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
- block_t *p_chain_out = NULL;
- block_t *p_block;
+ block_t *p_pic;
if( pp_block == NULL || *pp_block == NULL )
{
return NULL;
}
- p_block = *pp_block;
- *pp_block = NULL;
- if( p_block->b_discontinuity )
+ if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
{
- p_sys->b_frame_corrupted = VLC_TRUE;
- }
-
- /* Append data */
- 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 )
- {
- p_sys->p_start = p_sys->p_start - p_buffer + p_sys->p_buffer;
- }
- if( p_sys->p_old )
+ if( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED )
{
- p_sys->p_old = p_sys->p_old - p_buffer + p_sys->p_buffer;
+ p_sys->i_state = STATE_NOSYNC;
+ block_BytestreamFlush( &p_sys->bytestream );
+
+ p_sys->b_discontinuity = VLC_TRUE;
+ if( p_sys->p_frame )
+ block_ChainRelease( p_sys->p_frame );
+ p_sys->p_frame = NULL;
+ p_sys->pp_last = &p_sys->p_frame;
+ p_sys->b_frame_slice = VLC_FALSE;
}
+// p_sys->i_interpolated_dts =
+// p_sys->i_last_ref_pts = 0;
+ block_Release( *pp_block );
+ return NULL;
}
- memcpy( &p_sys->p_buffer[p_sys->i_buffer], p_block->p_buffer,
- p_block->i_buffer );
- p_sys->i_buffer += p_block->i_buffer;
- if( p_sys->i_buffer > 10*1000000 )
- {
- msg_Err( p_dec, "mmh reseting context" );
- p_sys->i_buffer = 0;
- }
+ block_BytestreamPush( &p_sys->bytestream, *pp_block );
- /* Split data in block */
- for( ;; )
+ while( 1 )
{
- if( mpgv_FindStartCode( &p_sys->p_start, &p_sys->p_buffer[p_sys->i_buffer] ) )
+ switch( p_sys->i_state )
{
- block_Release( p_block );
- if( p_sys->p_seq == NULL )
+ case STATE_NOSYNC:
+ if( block_FindStartcodeFromOffset( &p_sys->bytestream,
+ &p_sys->i_offset, p_sys->p_startcode, 3 ) == VLC_SUCCESS )
{
- block_ChainRelease( p_chain_out );
- return NULL;
+ p_sys->i_state = STATE_NEXT_SYNC;
}
- return p_chain_out;
- }
- if( p_sys->p_old )
- {
- /* Extract the data */
- int i_frag = p_sys->p_start - p_sys->p_old;
- block_t *p_frag = block_New( p_dec, i_frag );
+ if( p_sys->i_offset )
+ {
+ block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
+ p_sys->i_offset = 0;
+ block_BytestreamFlush( &p_sys->bytestream );
+ }
- memcpy( p_frag->p_buffer, p_sys->p_old, i_frag );
- if( i_frag < p_sys->i_buffer )
+ if( p_sys->i_state != STATE_NEXT_SYNC )
{
- memmove( p_sys->p_buffer, &p_sys->p_buffer[i_frag],
- p_sys->i_buffer - i_frag );
+ /* Need more data */
+ return NULL;
}
- 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 = 1; /* To find next startcode */
+
+ case STATE_NEXT_SYNC:
+ /* TODO: If p_block == NULL, flush the buffer without checking the
+ * next sync word */
+
+ /* Find the next startcode */
+ if( block_FindStartcodeFromOffset( &p_sys->bytestream,
+ &p_sys->i_offset, p_sys->p_startcode, 3 ) != VLC_SUCCESS )
{
- /* 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 );
+ /* Need more data */
+ return NULL;
+ }
- }
+ /* Get the new fragment and set the pts/dts */
+ p_pic = block_New( p_dec, p_sys->i_offset );
+ block_BytestreamFlush( &p_sys->bytestream );
+ p_pic->i_pts = p_sys->bytestream.p_block->i_pts;
+ p_pic->i_dts = p_sys->bytestream.p_block->i_dts;
- /* 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;
+ block_GetBytes( &p_sys->bytestream, p_pic->p_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 )
+ {
+ /* We have a picture start code */
+ p_sys->bytestream.p_block->i_pts = 0;
+ p_sys->bytestream.p_block->i_dts = 0;
}
- if( p_frag->p_buffer[3] == 0xb8 )
+ p_sys->i_offset = 0;
+
+ /* Get picture if any */
+ if( !( p_pic = ParseMPEGBlock( p_dec, p_pic ) ) )
{
- 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;
+ p_sys->i_state = STATE_NOSYNC;
+ break;
}
- else if( p_frag->p_buffer[3] == 0xb3 )
+
+ /* If a discontinuity has been encountered, then wait till
+ * the next Intra frame before continuing with packetizing */
+ if( p_sys->b_discontinuity &&
+ p_sys->b_sync_on_intra_frame )
{
- static const int code_to_frame_rate[16][2] =
+ if( p_pic->i_flags & BLOCK_FLAG_TYPE_I )
{
- { 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 );
+ msg_Dbg( p_dec, "synced on intra frame" );
+ p_sys->b_discontinuity = VLC_FALSE;
+ p_pic->i_flags |= BLOCK_FLAG_DISCONTINUITY;
}
- if( p_sys->p_ext )
+ else
{
- block_Release( p_sys->p_ext );
- p_sys->p_ext = NULL;
+ msg_Dbg( p_dec, "waiting on intra frame" );
+ p_sys->i_state = STATE_NOSYNC;
+ block_Release( p_pic );
+ break;
}
- p_sys->p_seq = block_Duplicate( p_frag );
- p_sys->i_seq_old = 0;
+ }
+
+ /* We've just started the stream, wait for the first PTS.
+ * We discard here so we can still get the sequence header. */
+ 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" );
+ p_sys->i_state = STATE_NOSYNC;
+ block_Release( p_pic );
+ break;
+ }
+
+ /* When starting the stream we can have the first frame with
+ * a null DTS (i_interpolated_pts is initialized to 0) */
+ if( !p_pic->i_dts ) p_pic->i_dts = p_pic->i_pts;
+
+ /* 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->pp_last = &p_sys->p_frame;
+ p_sys->b_frame_slice = VLC_FALSE;
- 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];
+ }
+ else if( p_sys->b_frame_slice &&
+ (p_frag->p_buffer[3] == 0x00 || p_frag->p_buffer[3] > 0xaf) )
+ {
+ mtime_t i_duration;
- 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_pic = block_ChainGather( p_sys->p_frame );
+ i_duration = (mtime_t)( 1000000 * p_sys->i_frame_rate_base /
+ p_sys->i_frame_rate );
- p_sys->b_seq_progressive = VLC_TRUE;
- p_sys->b_low_delay = VLC_TRUE;
+ if( !p_sys->b_seq_progressive && p_sys->i_picture_structure != 0x03 )
+ {
+ i_duration /= 2;
+ }
- 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 );
+ 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_frag->p_buffer[3] == 0xb5 )
+ else if( p_sys->i_top_field_first == 1 &&
+ p_sys->i_repeat_first_field == 1 )
{
- 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;
- }
+ i_duration *= 3;
}
- else if( p_frag->p_buffer[3] == 0x00 )
+ }
+ else
+ {
+ if( p_sys->i_picture_structure == 0x03 )
{
- /* picture */
- p_sys->i_seq_old++;
-
- if( p_frag->i_buffer >= 6 )
+ if( p_sys->i_progressive_frame && p_sys->i_repeat_first_field )
{
- 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;
+ i_duration += i_duration / 2;
}
}
- else if( p_frag->p_buffer[3] >= 0x01 && p_frag->p_buffer[3] <= 0xaf )
+ }
+
+ 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->b_second_field )
+ 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;
+
+ if( !p_sys->b_second_field )
+ p_sys->i_last_ref_pts = p_sys->i_pts;
+ }
+
+ p_pic->i_dts = p_sys->i_interpolated_dts;
+ p_sys->i_interpolated_dts += i_duration;
+
+ /* Set PTS only if we have a B frame or if it comes from the 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 = 0;
+ }
+
+ switch ( p_sys->i_picture_type )
+ {
+ case 0x01:
+ p_pic->i_flags |= BLOCK_FLAG_TYPE_I;
+ break;
+ case 0x02:
+ p_pic->i_flags |= BLOCK_FLAG_TYPE_P;
+ break;
+ case 0x03:
+ p_pic->i_flags |= BLOCK_FLAG_TYPE_B;
+ break;
+ }
+
+ p_pic->i_length = p_sys->i_interpolated_dts - p_pic->i_dts;
+
+#if 0
+ msg_Dbg( p_dec, "pic: type=%d dts="I64Fd" pts-dts="I64Fd,
+ p_sys->i_picture_type, p_pic->i_dts, p_pic->i_pts - p_pic->i_dts);
+#endif
+
+ /* Reset context */
+ p_sys->p_frame = NULL;
+ p_sys->pp_last = &p_sys->p_frame;
+ p_sys->b_frame_slice = VLC_FALSE;
+
+ if( p_sys->i_picture_structure != 0x03 )
+ {
+ p_sys->b_second_field = !p_sys->b_second_field;
+ }
+ else
+ {
+ p_sys->b_second_field = 0;
+ }
+ }
+
+ /*
+ * 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_ChainLastAppend( &p_sys->pp_last, block_Duplicate( p_sys->p_seq ) );
+ if( p_sys->p_ext )
{
- /* Slice */
- p_sys->b_frame_slice = VLC_TRUE;
+ block_ChainLastAppend( &p_sys->pp_last, block_Duplicate( p_sys->p_ext ) );
}
- /* Append the block */
- block_ChainAppend( &p_sys->p_frame, p_frag );
+ p_sys->i_seq_old = 0;
}
- p_sys->p_old = p_sys->p_start;
- p_sys->p_start += 4;
}
-}
+ 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_dec->fmt_out.video.i_frame_rate = p_sys->i_frame_rate;
+ p_dec->fmt_out.video.i_frame_rate_base = p_sys->i_frame_rate_base;
+
+ p_sys->b_seq_progressive = VLC_TRUE;
+ p_sys->b_low_delay = VLC_TRUE;
+
+ if ( !p_sys->b_inited )
+ {
+ 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 );
+ p_sys->b_inited = 1;
+ }
+ }
+ else if( p_frag->p_buffer[3] == 0xb5 )
+ {
+ int i_type = p_frag->p_buffer[4] >> 4;
-static int mpgv_FindStartCode( uint8_t **pp_start, uint8_t *p_end )
-{
- uint8_t *p = *pp_start;
+ /* Extension start code */
+ if( i_type == 0x01 )
+ {
+#if 0
+ static const int mpeg2_aspect[16][2] =
+ {
+ {0,1}, {1,1}, {4,3}, {16,9}, {221,100},
+ {0,1}, {0,1}, {0,1}, {0,1}, {0,1}, {0,1}, {0,1}, {0,1}, {0,1},
+ {0,1}, {0,1}
+ };
+#endif
- for( p = *pp_start; p < p_end - 4; p++ )
- {
- if( p[0] == 0 && p[1] == 0 && p[2] == 1 )
+ /* sequence extension */
+ 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;
+ }
+
+ /* Do not set aspect ratio : in case we're transcoding,
+ * transcode will take our fmt_out as a fmt_in to libmpeg2.
+ * libmpeg2.c will then believe that the user has requested
+ * a specific aspect ratio, which she hasn't. Thus in case
+ * of aspect ratio change, we're screwed. --Meuuh
+ */
+#if 0
+ 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 )
{
- *pp_start = p;
- return VLC_SUCCESS;
+ /* picture extension */
+ 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 start code */
+ p_sys->i_seq_old++;
- *pp_start = p;
- return VLC_EGENERIC;
-}
+ 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;
+ }
+ p_sys->i_dts = p_frag->i_dts;
+ 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_ChainLastAppend( &p_sys->pp_last, p_frag );
+
+ return p_pic;
+}
projects / vlc / blobdiff