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vlc/modules/packetizer/mpeg4video.c

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/*****************************************************************************
* mpeg4video.c: mpeg 4 video packetizer
*****************************************************************************
* Copyright (C) 2001, 2002 VideoLAN
* $Id$
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
* Eric Petit <titer@videolan.org>
* Gildas Bazin <gbazin@netcourrier.com>
*
* 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
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* 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.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <stdlib.h> /* malloc(), free() */
#include <vlc/vlc.h>
#include <vlc/decoder.h>
#include <vlc/sout.h>
#include "vlc_bits.h"
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
vlc_module_begin();
set_description( _("MPEG4 video packetizer") );
set_capability( "packetizer", 50 );
set_callbacks( Open, Close );
vlc_module_end();
/****************************************************************************
* Local prototypes
****************************************************************************/
static block_t *Packetize( decoder_t *, block_t ** );
struct decoder_sys_t
{
/*
* Common properties
*/
mtime_t i_pts;
mtime_t i_dts;
vlc_bool_t b_vop;
int i_buffer;
int i_buffer_size;
uint8_t *p_buffer;
unsigned int i_flags;
vlc_bool_t b_frame;
};
static int m4v_FindStartCode( uint8_t **pp_start, uint8_t *p_end );
static int m4v_VOLParse( es_format_t *fmt, uint8_t *p_vol, int i_vol );
#define VIDEO_OBJECT_MASK 0x01f
#define VIDEO_OBJECT_LAYER_MASK 0x00f
#define VIDEO_OBJECT_START_CODE 0x100
#define VIDEO_OBJECT_LAYER_START_CODE 0x120
#define VISUAL_OBJECT_SEQUENCE_START_CODE 0x1b0
#define VISUAL_OBJECT_SEQUENCE_END_CODE 0x1b1
#define USER_DATA_START_CODE 0x1b2
#define GROUP_OF_VOP_START_CODE 0x1b3
#define VIDEO_SESSION_ERROR_CODE 0x1b4
#define VISUAL_OBJECT_START_CODE 0x1b5
#define VOP_START_CODE 0x1b6
#define FACE_OBJECT_START_CODE 0x1ba
#define FACE_OBJECT_PLANE_START_CODE 0x1bb
#define MESH_OBJECT_START_CODE 0x1bc
#define MESH_OBJECT_PLANE_START_CODE 0x1bd
#define STILL_TEXTURE_OBJECT_START_CODE 0x1be
#define TEXTURE_SPATIAL_LAYER_START_CODE 0x1bf
#define TEXTURE_SNR_LAYER_START_CODE 0x1c0
/*****************************************************************************
* Open: probe the packetizer and return score
*****************************************************************************/
static int Open( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys;
switch( p_dec->fmt_in.i_codec )
{
case VLC_FOURCC( 'm', '4', 's', '2'):
case VLC_FOURCC( 'M', '4', 'S', '2'):
case VLC_FOURCC( 'm', 'p', '4', 's'):
case VLC_FOURCC( 'M', 'P', '4', 'S'):
case VLC_FOURCC( 'm', 'p', '4', 'v'):
case VLC_FOURCC( 'D', 'I', 'V', 'X'):
case VLC_FOURCC( 'd', 'i', 'v', 'x'):
case VLC_FOURCC( 'X', 'V', 'I', 'D'):
case VLC_FOURCC( 'X', 'v', 'i', 'D'):
case VLC_FOURCC( 'x', 'v', 'i', 'd'):
case VLC_FOURCC( 'D', 'X', '5', '0'):
case VLC_FOURCC( 'd', 'x', '5', '0'):
case VLC_FOURCC( 0x04, 0, 0, 0):
case VLC_FOURCC( '3', 'I', 'V', '2'):
case VLC_FOURCC( 'm', '4', 'c', 'c'):
case VLC_FOURCC( 'M', '4', 'C', 'C'):
break;
default:
return VLC_EGENERIC;
}
/* Allocate the memory needed to store the decoder's structure */
if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
{
msg_Err( p_dec, "out of memory" );
return VLC_EGENERIC;
}
p_sys->i_pts = 0;
p_sys->i_dts = 0;
p_sys->b_vop = VLC_FALSE;
p_sys->i_buffer = 0;
p_sys->i_buffer_size = 0;
p_sys->p_buffer = 0;
p_sys->i_flags = 0;
p_sys->b_frame = VLC_FALSE;
/* 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' );
if( p_dec->fmt_in.i_extra )
{
/* We have a vol */
p_dec->fmt_out.i_extra = p_dec->fmt_in.i_extra;
p_dec->fmt_out.p_extra = malloc( p_dec->fmt_in.i_extra );
memcpy( p_dec->fmt_out.p_extra, p_dec->fmt_in.p_extra,
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->fmt_out,
p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
}
else
{
/* No vol, we'll have to look for one later on */
p_dec->fmt_out.i_extra = 0;
p_dec->fmt_out.p_extra = 0;
}
/* Set callback */
p_dec->pf_packetize = Packetize;
return VLC_SUCCESS;
}
/*****************************************************************************
* Close: clean up the packetizer
*****************************************************************************/
static void Close( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
if( p_dec->p_sys->p_buffer ) free( p_dec->p_sys->p_buffer );
free( p_dec->p_sys );
}
/****************************************************************************
* Packetize: the whole thing
****************************************************************************/
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;
uint8_t *p_vol = NULL;
uint8_t *p_start;
if( !pp_block || !*pp_block ) return NULL;
p_block = *pp_block;
/* Append data */
if( p_sys->i_buffer + p_block->i_buffer > p_sys->i_buffer_size )
{
p_sys->i_buffer_size += p_block->i_buffer + 1024;
p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
}
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;
}
/* 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( ;; )
{
if( m4v_FindStartCode( &p_start, &p_sys->p_buffer[p_sys->i_buffer] ) )
{
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 )
{
/* Copy the complete VOL */
p_dec->fmt_out.i_extra = p_start - p_vol;
p_dec->fmt_out.p_extra = malloc( 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->fmt_out,
p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
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 )
{
memmove( p_sys->p_buffer, &p_sys->p_buffer[i_out],
p_sys->i_buffer - i_out );
}
p_sys->i_buffer -= i_out;
p_start -= i_out;
p_out->i_flags = p_sys->i_flags;
/* FIXME do proper dts/pts */
p_out->i_pts = p_sys->i_pts;
p_out->i_dts = p_sys->i_dts;
/* FIXME doesn't work when there is multiple VOP in one block */
if( p_block->i_dts > p_sys->i_dts )
{
p_out->i_length = p_block->i_dts - p_sys->i_dts;
}
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 );
}
#if 0
fprintf( stderr, "pts=%lld dts=%lld length=%lldms\n",
p_out->i_pts, p_out->i_dts,
p_out->i_length / 1000 );
#endif
p_sys->b_vop = VLC_FALSE;
}
if( p_start[3] >= 0x20 && p_start[3] <= 0x2f )
{
/* Start of the VOL */
p_vol = p_start;
}
else if( p_start[3] == 0xb6 )
{
p_sys->b_vop = VLC_TRUE;
switch( p_start[4] >> 6 )
{
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;
}
/* The pts information is not available in all the containers.
* FIXME: calculate the pts correctly */
if( p_block->i_pts > 0 )
{
p_sys->i_pts = p_block->i_pts;
}
else if( (p_sys->i_flags&BLOCK_FLAG_TYPE_B) || !p_sys->b_frame )
{
p_sys->i_pts = p_block->i_dts;
}
else
{
p_sys->i_pts = 0;
}
if( p_block->i_dts > 0 )
{
p_sys->i_dts = p_block->i_dts;
}
else if( p_sys->i_dts > 0 )
{
/* XXX KLUDGE immonde, else transcode won't work */
p_sys->i_dts += 1000;
}
}
p_start += 4; /* Next */
}
}
/****************************************************************************
* m4v_FindStartCode
****************************************************************************/
static int m4v_FindStartCode( uint8_t **pp_start, uint8_t *p_end )
{
uint8_t *p = *pp_start;
/* We wait for 4+1 bytes */
for( p = *pp_start; p < p_end - 5; p++ )
{
if( p[0] == 0 && p[1] == 0 && p[2] == 1 )
{
*pp_start = p;
return VLC_SUCCESS;
}
}
*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] =
{
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;
}
/* m4v_VOLParse:
* TODO:
* - support aspect ratio
*/
static int m4v_VOLParse( es_format_t *fmt, uint8_t *p_vol, int i_vol )
{
bs_t s;
int i_vo_type;
int i_vo_ver_id;
int i_ar;
int i_shape;
int i_time_increment_resolution;
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;
}
}
/* parse the vol */
bs_init( &s, &p_vol[4], i_vol - 4 );
bs_skip( &s, 1 ); /* random access */
i_vo_type = bs_read( &s, 8 );
if( bs_read1( &s ) )
{
i_vo_ver_id = bs_read( &s, 4 );
bs_skip( &s, 3 );
}
else
{
i_vo_ver_id = 1;
}
i_ar = bs_read( &s, 4 );
if( i_ar == 0xf )
{
int i_ar_width, i_ar_height;
i_ar_width = bs_read( &s, 8 );
i_ar_height= bs_read( &s, 8 );
}
if( bs_read1( &s ) )
{
int i_chroma_format;
int i_low_delay;
/* vol control parameter */
i_chroma_format = bs_read( &s, 2 );
i_low_delay = bs_read1( &s );
if( bs_read1( &s ) )
{
bs_skip( &s, 16 );
bs_skip( &s, 16 );
bs_skip( &s, 16 );
bs_skip( &s, 3 );
bs_skip( &s, 11 );
bs_skip( &s, 1 );
bs_skip( &s, 16 );
}
}
/* shape 0->RECT, 1->BIN, 2->BIN_ONLY, 3->GRAY */
i_shape = bs_read( &s, 2 );
if( i_shape == 3 && i_vo_ver_id != 1 )
{
bs_skip( &s, 4 );
}
if( !bs_read1( &s ) )
{
/* marker */
return VLC_EGENERIC;
}
i_time_increment_resolution = bs_read( &s, 16 );
if( !bs_read1( &s ) )
{
/* marker */
return VLC_EGENERIC;
}
if( bs_read1( &s ) )
{
int i_time_increment_bits = vlc_log2( i_time_increment_resolution - 1 ) + 1;
if( i_time_increment_bits < 1 )
{
i_time_increment_bits = 1;
}
bs_skip( &s, i_time_increment_bits );
}
if( i_shape == 0 )
{
bs_skip( &s, 1 );
fmt->video.i_width = bs_read( &s, 13 );
bs_skip( &s, 1 );
fmt->video.i_height= bs_read( &s, 13 );
bs_skip( &s, 1 );
}
return VLC_SUCCESS;
}
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