/*****************************************************************************
* mpeg4video.c: mpeg 4 video packetizer
*****************************************************************************
- * Copyright (C) 2001, 2002, 2006 the VideoLAN team
+ * Copyright (C) 2001-2006 the VideoLAN team
* $Id$
*
- * Authors: Laurent Aimar <fenrir@via.ecp.fr>
+ * Authors: Gildas Bazin <gbazin@videolan.org>
+ * Laurent Aimar <fenrir@via.ecp.fr>
* Eric Petit <titer@videolan.org>
- * Gildas Bazin <gbazin@videolan.org>
*
* 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
#include <vlc/input.h> /* hmmm, just for INPUT_RATE_DEFAULT */
#include "vlc_bits.h"
+#include "vlc_block_helper.h"
/*****************************************************************************
* Module descriptor
set_callbacks( Open, Close );
vlc_module_end();
-
/****************************************************************************
* Local prototypes
****************************************************************************/
struct decoder_sys_t
{
+ /*
+ * Input properties
+ */
+ block_bytestream_t bytestream;
+ int i_state;
+ int i_offset;
+ uint8_t p_startcode[3];
+
/*
* Common properties
*/
mtime_t i_last_time;
mtime_t i_last_timeincr;
- vlc_bool_t b_vop;
- int i_buffer;
- int i_buffer_size;
- uint8_t *p_buffer;
unsigned int i_flags;
int i_fps_num;
int i_last_incr_diff;
vlc_bool_t b_frame;
+
+ /* Current frame being built */
+ block_t *p_frame;
+ block_t **pp_last;
};
-static int m4v_FindStartCode( uint8_t **, uint8_t * );
-static int m4v_VOLParse( decoder_t *, es_format_t *, uint8_t *, int );
+enum {
+ STATE_NOSYNC,
+ STATE_NEXT_SYNC
+};
+
+static block_t *ParseMPEGBlock( decoder_t *, block_t * );
+static int ParseVOL( decoder_t *, es_format_t *, uint8_t *, int );
+static int ParseVOP( decoder_t *, block_t * );
static int vlc_log2( unsigned int );
#define VIDEO_OBJECT_MASK 0x01f
}
memset( p_sys, 0, 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_frame = NULL;
+ p_sys->pp_last = &p_sys->p_frame;
+
/* Setup properties */
es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
p_dec->fmt_out.i_codec = VLC_FOURCC( 'm', 'p', '4', 'v' );
p_dec->fmt_in.i_extra );
msg_Dbg( p_dec, "opening with vol size: %d", p_dec->fmt_in.i_extra );
- m4v_VOLParse( p_dec, &p_dec->fmt_out,
- p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
+ ParseVOL( p_dec, &p_dec->fmt_out,
+ p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
}
else
{
{
decoder_t *p_dec = (decoder_t*)p_this;
- if( p_dec->p_sys->p_buffer ) free( p_dec->p_sys->p_buffer );
+ block_BytestreamRelease( &p_dec->p_sys->bytestream );
+ if( p_dec->p_sys->p_frame ) block_ChainRelease( p_dec->p_sys->p_frame );
free( p_dec->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_pic;
+ mtime_t i_pts, i_dts;
- block_t *p_chain_out = NULL;
- block_t *p_block;
- uint8_t *p_vol = NULL;
- uint8_t *p_start;
-
- if( !pp_block || !*pp_block ) return NULL;
-
- p_block = *pp_block;
+ if( pp_block == NULL || *pp_block == NULL ) return NULL;
- /* Append data */
- if( p_sys->i_buffer + p_block->i_buffer > p_sys->i_buffer_size )
+ if( (*pp_block)->i_flags & BLOCK_FLAG_DISCONTINUITY )
{
- p_sys->i_buffer_size += p_block->i_buffer + 1024;
- p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
+ p_sys->i_state = STATE_NOSYNC;
+ if( p_sys->p_frame ) block_ChainRelease( p_sys->p_frame );
+ p_sys->p_frame = NULL;
+ p_sys->pp_last = &p_sys->p_frame;
+ 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_Warn( p_dec, "reseting context" );
- p_sys->i_buffer = 0;
- }
+ block_BytestreamPush( &p_sys->bytestream, *pp_block );
- /* Search vop */
- p_start = &p_sys->p_buffer[p_sys->i_buffer - p_block->i_buffer - 4];
- if( p_start < p_sys->p_buffer )
- {
- p_start = p_sys->p_buffer;
- }
- for( ;; )
+ while( 1 )
{
- if( m4v_FindStartCode( &p_start, &p_sys->p_buffer[p_sys->i_buffer] ) )
+ switch( p_sys->i_state )
{
- block_Release( p_block );
- *pp_block = NULL;
- return p_chain_out;
- }
- /* fprintf( stderr, "start code=0x1%2.2x\n", p_start[3] ); */
- if( p_vol )
- {
- if( !p_dec->fmt_out.i_extra )
+ case STATE_NOSYNC:
+ if( block_FindStartcodeFromOffset( &p_sys->bytestream,
+ &p_sys->i_offset, p_sys->p_startcode, 3 ) == VLC_SUCCESS )
{
- /* Copy the complete VOL */
- p_dec->fmt_out.i_extra = p_start - p_vol;
- p_dec->fmt_out.p_extra =
- realloc( p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
- memcpy( p_dec->fmt_out.p_extra, p_vol,
- p_dec->fmt_out.i_extra );
- m4v_VOLParse( p_dec, &p_dec->fmt_out,
- p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
+ p_sys->i_state = STATE_NEXT_SYNC;
}
- /* Remove VOL from the original stream */
- memmove( p_vol, p_start,
- p_sys->i_buffer - (p_start - p_sys->p_buffer) );
- p_sys->i_buffer -= p_dec->fmt_out.i_extra;
- p_start = p_vol;
-
- p_vol = NULL;
- }
- if( p_sys->b_vop )
- {
- /* Output the complete VOP we have */
- int i_out = p_start - p_sys->p_buffer;
- block_t *p_out = block_New( p_dec, i_out );
-
- /* extract data */
- memcpy( p_out->p_buffer, p_sys->p_buffer, i_out );
- if( i_out < p_sys->i_buffer )
+ if( p_sys->i_offset )
{
- memmove( p_sys->p_buffer, &p_sys->p_buffer[i_out],
- p_sys->i_buffer - i_out );
+ block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
+ p_sys->i_offset = 0;
+ block_BytestreamFlush( &p_sys->bytestream );
}
- p_sys->i_buffer -= i_out;
- p_start -= i_out;
-
- p_out->i_flags = p_sys->i_flags;
- p_out->i_pts = p_sys->i_interpolated_pts;
- p_out->i_dts = p_sys->i_interpolated_dts;
- /* FIXME doesn't work when there is multiple VOP in one block */
- if( p_block->i_dts > p_sys->i_interpolated_dts )
+ if( p_sys->i_state != STATE_NEXT_SYNC )
{
- p_out->i_length = p_block->i_dts - p_sys->i_interpolated_dts;
+ /* Need more data */
+ return NULL;
}
- if( p_dec->fmt_out.i_extra > 0 )
- {
- block_ChainAppend( &p_chain_out, p_out );
- }
- else
- {
- msg_Warn( p_dec, "waiting for VOL" );
- block_Release( p_out );
- }
+ p_sys->i_offset = 1; /* To find next startcode */
- p_sys->b_vop = VLC_FALSE;
- }
+ case STATE_NEXT_SYNC:
+ /* TODO: If p_block == NULL, flush the buffer without checking the
+ * next sync word */
- if( p_start[3] >= 0x20 && p_start[3] <= 0x2f )
- {
- /* Start of the VOL */
- p_vol = p_start;
- }
- else if( p_start[3] == 0xb3 )
- {
- /* GOP header */
- }
- else if( p_start[3] == 0xb6 )
- {
- /* Parse the VOP */
- bs_t s;
- int i_modulo_time_base = 0;
- int i_time_increment_bits;
- int64_t i_time_increment, i_time_ref;
-
- /* FIXME: we don't actually check we received enough data to read
- * the VOP time increment. */
- bs_init( &s, &p_start[4],
- p_sys->i_buffer - (p_start - p_sys->p_buffer) - 4 );
-
- switch( bs_read( &s, 2 ) )
+ /* Find the next startcode */
+ if( block_FindStartcodeFromOffset( &p_sys->bytestream,
+ &p_sys->i_offset, p_sys->p_startcode, 3 ) != VLC_SUCCESS )
{
- case 0:
- p_sys->i_flags = BLOCK_FLAG_TYPE_I;
- break;
- case 1:
- p_sys->i_flags = BLOCK_FLAG_TYPE_P;
- break;
- case 2:
- p_sys->i_flags = BLOCK_FLAG_TYPE_B;
- p_sys->b_frame = VLC_TRUE;
- break;
- case 3: /* gni ? */
- p_sys->i_flags = BLOCK_FLAG_TYPE_PB;
- break;
+ /* Need more data */
+ return NULL;
}
- while( bs_read( &s, 1 ) ) i_modulo_time_base++;
- if( !bs_read1( &s ) ) continue; /* Marker */
+ /* 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 = i_pts = p_sys->bytestream.p_block->i_pts;
+ p_pic->i_dts = i_dts = p_sys->bytestream.p_block->i_dts;
+ p_pic->i_rate = p_sys->bytestream.p_block->i_rate;
+
+ block_GetBytes( &p_sys->bytestream, p_pic->p_buffer,
+ p_pic->i_buffer );
- /* VOP time increment */
- i_time_increment_bits = vlc_log2(p_dec->p_sys->i_fps_num - 1) + 1;
- if( i_time_increment_bits < 1 ) i_time_increment_bits = 1;
- i_time_increment = bs_read( &s, i_time_increment_bits );
+ p_sys->i_offset = 0;
- /* Interpolate PTS/DTS */
- if( !(p_sys->i_flags & BLOCK_FLAG_TYPE_B) )
+ /* Get picture if any */
+ if( !( p_pic = ParseMPEGBlock( p_dec, p_pic ) ) )
{
- p_sys->i_last_time_ref = p_sys->i_time_ref;
- p_sys->i_time_ref +=
- (i_modulo_time_base * p_dec->p_sys->i_fps_num);
- i_time_ref = p_sys->i_time_ref;
+ p_sys->i_state = STATE_NOSYNC;
+ break;
}
- else
+
+ /* don't reuse the same timestamps several times */
+ if( i_pts == p_sys->bytestream.p_block->i_pts &&
+ i_dts == p_sys->bytestream.p_block->i_dts )
{
- i_time_ref = p_sys->i_last_time_ref +
- (i_modulo_time_base * p_dec->p_sys->i_fps_num);
+ p_sys->bytestream.p_block->i_pts = 0;
+ p_sys->bytestream.p_block->i_dts = 0;
}
- if( p_dec->p_sys->i_fps_num < 5 && /* Work-around buggy streams */
- p_dec->fmt_in.video.i_frame_rate > 0 &&
- p_dec->fmt_in.video.i_frame_rate_base > 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_interpolated_pts <= 0 &&
+ p_sys->i_interpolated_dts <= 0 )
{
- p_sys->i_interpolated_pts += I64C(1000000) *
- p_dec->fmt_in.video.i_frame_rate_base *
- p_block->i_rate / INPUT_RATE_DEFAULT /
- p_dec->fmt_in.video.i_frame_rate;
+ msg_Dbg( p_dec, "need a starting pts/dts" );
+ p_sys->i_state = STATE_NOSYNC;
+ block_Release( p_pic );
+ break;
}
- else if( p_dec->p_sys->i_fps_num )
- p_sys->i_interpolated_pts +=
- ( I64C(1000000) * (i_time_ref + i_time_increment -
- p_sys->i_last_time - p_sys->i_last_timeincr) *
- p_block->i_rate / INPUT_RATE_DEFAULT /
- p_dec->p_sys->i_fps_num );
-
- p_sys->i_last_time = i_time_ref;
- p_sys->i_last_timeincr = i_time_increment;
-
- /* Correct interpolated dts when we receive a new pts/dts */
- if( p_block->i_pts > 0 )
- p_sys->i_interpolated_pts = p_block->i_pts;
- if( p_block->i_dts > 0 )
- p_sys->i_interpolated_dts = p_block->i_dts;
-
- if( (p_sys->i_flags & BLOCK_FLAG_TYPE_B) || !p_sys->b_frame )
- {
- /* Trivial case (DTS == PTS) */
-
- p_sys->i_interpolated_dts = p_sys->i_interpolated_pts;
-
- if( p_block->i_pts > 0 )
- p_sys->i_interpolated_dts = p_block->i_pts;
- if( p_block->i_dts > 0 )
- p_sys->i_interpolated_dts = p_block->i_dts;
- p_sys->i_interpolated_pts = p_sys->i_interpolated_dts;
- }
- else
- {
- if( p_sys->i_last_ref_pts > 0 )
- p_sys->i_interpolated_dts = p_sys->i_last_ref_pts;
+ /* 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;
- p_sys->i_last_ref_pts = p_sys->i_interpolated_pts;
- }
+ /* So p_block doesn't get re-added several times */
+ *pp_block = block_BytestreamPop( &p_sys->bytestream );
- p_sys->b_vop = VLC_TRUE;
+ p_sys->i_state = STATE_NOSYNC;
- /* Don't re-use the same PTS/DTS twice */
- p_block->i_pts = p_block->i_dts = 0;
+ return p_pic;
}
-
- p_start += 4; /* Next */
}
}
-/****************************************************************************
- * m4v_FindStartCode
- ****************************************************************************/
-static int m4v_FindStartCode( uint8_t **pp_start, uint8_t *p_end )
+/*****************************************************************************
+ * ParseMPEGBlock: Re-assemble fragments into a block containing a picture
+ *****************************************************************************/
+static block_t *ParseMPEGBlock( decoder_t *p_dec, block_t *p_frag )
{
- uint8_t *p = *pp_start;
+ decoder_sys_t *p_sys = p_dec->p_sys;
+ block_t *p_pic = NULL;
- /* We wait for 4+1 bytes */
- for( p = *pp_start; p < p_end - 5; p++ )
+ if( p_frag->p_buffer[3] == 0xB0 || p_frag->p_buffer[3] == 0xB1 )
{
- if( p[0] == 0 && p[1] == 0 && p[2] == 1 )
- {
- *pp_start = p;
- return VLC_SUCCESS;
- }
+ /* Remove VOS start/end code from the original stream */
+ block_Release( p_frag );
+ return NULL;
}
-
- *pp_start = p_end;
- return VLC_EGENERIC;
-}
-
-
-/* look at ffmpeg av_log2 ;) */
-static int vlc_log2( unsigned int v )
-{
- int n = 0;
- static const int vlc_log2_table[16] =
+ if( p_frag->p_buffer[3] >= 0x20 && p_frag->p_buffer[3] <= 0x2f )
{
- 0,0,1,1,2,2,2,2, 3,3,3,3,3,3,3,3
- };
-
- if( v&0xffff0000 )
- {
- v >>= 16;
- n += 16;
+ /* Copy the complete VOL */
+ p_dec->fmt_out.i_extra = p_frag->i_buffer;
+ p_dec->fmt_out.p_extra =
+ realloc( p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
+ memcpy( p_dec->fmt_out.p_extra, p_frag->p_buffer, p_frag->i_buffer );
+ ParseVOL( p_dec, &p_dec->fmt_out,
+ p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
+
+ /* Remove from the original stream */
+ block_Release( p_frag );
+ return NULL;
}
- if( v&0xff00 )
+ else
{
- v >>= 8;
- n += 8;
+ if( !p_dec->fmt_out.i_extra )
+ {
+ msg_Warn( p_dec, "waiting for VOL" );
+ block_Release( p_frag );
+ return NULL;
+ }
+
+ /* Append the block */
+ block_ChainLastAppend( &p_sys->pp_last, p_frag );
}
- if( v&0xf0 )
+
+ if( p_frag->p_buffer[3] == 0xb6 &&
+ ParseVOP( p_dec, p_frag ) == VLC_SUCCESS )
{
- v >>= 4;
- n += 4;
+ /* We are dealing with a VOP */
+ p_pic = block_ChainGather( p_sys->p_frame );
+ p_pic->i_pts = p_sys->i_interpolated_pts;
+ p_pic->i_dts = p_sys->i_interpolated_dts;
+
+ /* Reset context */
+ p_sys->p_frame = NULL;
+ p_sys->pp_last = &p_sys->p_frame;
}
- n += vlc_log2_table[v];
- return n;
+ return p_pic;
}
-/* m4v_VOLParse:
+/* ParseVOL:
* TODO:
* - support aspect ratio
*/
-static int m4v_VOLParse( decoder_t *p_dec, es_format_t *fmt,
- uint8_t *p_vol, int i_vol )
+static int ParseVOL( decoder_t *p_dec, es_format_t *fmt,
+ uint8_t *p_vol, int i_vol )
{
+ decoder_sys_t *p_sys = p_dec->p_sys;
+ int i_vo_type, i_vo_ver_id, i_ar, i_shape;
bs_t s;
- int i_vo_type;
- int i_vo_ver_id;
- int i_ar;
- int i_shape;
for( ;; )
{
- if( p_vol[0] == 0x00 && p_vol[1] == 0x00 &&
- p_vol[2] == 0x01 &&
- p_vol[3] >= 0x20 && p_vol[3] <= 0x2f )
- {
- break;
- }
- p_vol++;
- i_vol--;
- if( i_vol <= 4 )
- {
- return VLC_EGENERIC;
- }
+ if( p_vol[0] == 0x00 && p_vol[1] == 0x00 && p_vol[2] == 0x01 &&
+ p_vol[3] >= 0x20 && p_vol[3] <= 0x2f ) break;
+
+ p_vol++; i_vol--;
+ if( i_vol <= 4 ) return VLC_EGENERIC;
}
- /* parse the vol */
bs_init( &s, &p_vol[4], i_vol - 4 );
bs_skip( &s, 1 ); /* random access */
if( !bs_read1( &s ) ) return VLC_EGENERIC; /* Marker */
- p_dec->p_sys->i_fps_num = bs_read( &s, 16 ); /* Time increment resolution*/
- if( !p_dec->p_sys->i_fps_num ) p_dec->p_sys->i_fps_num = 1;
+ p_sys->i_fps_num = bs_read( &s, 16 ); /* Time increment resolution*/
+ if( !p_sys->i_fps_num ) p_sys->i_fps_num = 1;
if( !bs_read1( &s ) ) return VLC_EGENERIC; /* Marker */
if( bs_read1( &s ) )
{
- int i_time_increment_bits =
- vlc_log2( p_dec->p_sys->i_fps_num - 1 ) + 1;
+ int i_time_increment_bits = vlc_log2( p_sys->i_fps_num - 1 ) + 1;
if( i_time_increment_bits < 1 ) i_time_increment_bits = 1;
- p_dec->p_sys->i_fps_den = bs_read( &s, i_time_increment_bits );
+ p_sys->i_fps_den = bs_read( &s, i_time_increment_bits );
}
if( i_shape == 0 )
{
fmt->video.i_height= bs_read( &s, 13 );
bs_skip( &s, 1 );
}
+
+ return VLC_SUCCESS;
+}
+
+static int ParseVOP( decoder_t *p_dec, block_t *p_vop )
+{
+ decoder_sys_t *p_sys = p_dec->p_sys;
+ int64_t i_time_increment, i_time_ref;
+ int i_modulo_time_base = 0, i_time_increment_bits;
+ bs_t s;
+
+ bs_init( &s, &p_vop->p_buffer[4], p_vop->i_buffer - 4 );
+
+ switch( bs_read( &s, 2 ) )
+ {
+ case 0:
+ p_sys->i_flags = BLOCK_FLAG_TYPE_I;
+ break;
+ case 1:
+ p_sys->i_flags = BLOCK_FLAG_TYPE_P;
+ break;
+ case 2:
+ p_sys->i_flags = BLOCK_FLAG_TYPE_B;
+ p_sys->b_frame = VLC_TRUE;
+ break;
+ case 3: /* gni ? */
+ p_sys->i_flags = BLOCK_FLAG_TYPE_PB;
+ break;
+ }
+
+ while( bs_read( &s, 1 ) ) i_modulo_time_base++;
+ if( !bs_read1( &s ) ) return VLC_EGENERIC; /* Marker */
+
+ /* VOP time increment */
+ i_time_increment_bits = vlc_log2(p_dec->p_sys->i_fps_num - 1) + 1;
+ if( i_time_increment_bits < 1 ) i_time_increment_bits = 1;
+ i_time_increment = bs_read( &s, i_time_increment_bits );
+
+ /* Interpolate PTS/DTS */
+ if( !(p_sys->i_flags & BLOCK_FLAG_TYPE_B) )
+ {
+ p_sys->i_last_time_ref = p_sys->i_time_ref;
+ p_sys->i_time_ref +=
+ (i_modulo_time_base * p_dec->p_sys->i_fps_num);
+ i_time_ref = p_sys->i_time_ref;
+ }
+ else
+ {
+ i_time_ref = p_sys->i_last_time_ref +
+ (i_modulo_time_base * p_dec->p_sys->i_fps_num);
+ }
+
+#if 0
+ msg_Err( p_dec, "interp pts/dts (%lli,%lli), pts/dts (%lli,%lli)",
+ p_sys->i_interpolated_pts, p_sys->i_interpolated_dts,
+ p_vop->i_pts, p_vop->i_dts );
+#endif
+
+ if( p_dec->p_sys->i_fps_num < 5 && /* Work-around buggy streams */
+ p_dec->fmt_in.video.i_frame_rate > 0 &&
+ p_dec->fmt_in.video.i_frame_rate_base > 0 )
+ {
+ p_sys->i_interpolated_pts += I64C(1000000) *
+ p_dec->fmt_in.video.i_frame_rate_base *
+ p_vop->i_rate / INPUT_RATE_DEFAULT /
+ p_dec->fmt_in.video.i_frame_rate;
+ }
+ else if( p_dec->p_sys->i_fps_num )
+ p_sys->i_interpolated_pts +=
+ ( I64C(1000000) * (i_time_ref + i_time_increment -
+ p_sys->i_last_time - p_sys->i_last_timeincr) *
+ p_vop->i_rate / INPUT_RATE_DEFAULT /
+ p_dec->p_sys->i_fps_num );
+
+ p_sys->i_last_time = i_time_ref;
+ p_sys->i_last_timeincr = i_time_increment;
+
+ /* Correct interpolated dts when we receive a new pts/dts */
+ if( p_vop->i_pts > 0 )
+ p_sys->i_interpolated_pts = p_vop->i_pts;
+ if( p_vop->i_dts > 0 )
+ p_sys->i_interpolated_dts = p_vop->i_dts;
+
+ if( (p_sys->i_flags & BLOCK_FLAG_TYPE_B) || !p_sys->b_frame )
+ {
+ /* Trivial case (DTS == PTS) */
+
+ p_sys->i_interpolated_dts = p_sys->i_interpolated_pts;
+
+ if( p_vop->i_pts > 0 )
+ p_sys->i_interpolated_dts = p_vop->i_pts;
+ if( p_vop->i_dts > 0 )
+ p_sys->i_interpolated_dts = p_vop->i_dts;
+
+ p_sys->i_interpolated_pts = p_sys->i_interpolated_dts;
+ }
+ else
+ {
+ if( p_sys->i_last_ref_pts > 0 )
+ p_sys->i_interpolated_dts = p_sys->i_last_ref_pts;
+
+ p_sys->i_last_ref_pts = p_sys->i_interpolated_pts;
+ }
+
return VLC_SUCCESS;
}
+
+/* look at ffmpeg av_log2 ;) */
+static int vlc_log2( unsigned int v )
+{
+ int n = 0;
+ static const int vlc_log2_table[16] =
+ {
+ 0,0,1,1,2,2,2,2, 3,3,3,3,3,3,3,3
+ };
+
+ if( v&0xffff0000 )
+ {
+ v >>= 16;
+ n += 16;
+ }
+ if( v&0xff00 )
+ {
+ v >>= 8;
+ n += 8;
+ }
+ if( v&0xf0 )
+ {
+ v >>= 4;
+ n += 4;
+ }
+ n += vlc_log2_table[v];
+
+ return n;
+}
projects / vlc / commitdiff