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vlc/modules/packetizer/mpeg4video.c

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/*****************************************************************************
* mpeg4video.c: mpeg 4 video packetizer
*****************************************************************************
* Copyright (C) 2001-2006 VLC authors and VideoLAN
*
* Authors: Gildas Bazin <gbazin@videolan.org>
* Laurent Aimar <fenrir@via.ecp.fr>
* Eric Petit <titer@videolan.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_sout.h>
#include <vlc_codec.h>
#include <vlc_block.h>
#include <vlc_bits.h>
#include <vlc_block_helper.h>
#include "packetizer_helper.h"
#include "startcode_helper.h"
#include "h26x_nal_common.h"
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
vlc_module_begin ()
set_subcategory( SUBCAT_SOUT_PACKETIZER )
set_description( N_("MPEG4 video packetizer") )
set_capability( "packetizer", 50 )
set_callbacks( Open, Close )
vlc_module_end ()
/****************************************************************************
* Local prototypes
****************************************************************************/
typedef struct
{
/*
* Input properties
*/
packetizer_t packetizer;
/*
* Common properties
*/
vlc_tick_t i_interpolated_pts;
vlc_tick_t i_interpolated_dts;
vlc_tick_t i_last_ref_pts;
int64_t i_last_time_ref;
int64_t i_time_ref;
int64_t i_last_time;
int64_t i_last_timeincr;
unsigned int i_flags;
int i_fps_num;
int i_fps_den;
bool b_frame;
/* Current frame being built */
block_t *p_frame;
block_t **pp_last;
} decoder_sys_t;
static block_t *Packetize( decoder_t *, block_t ** );
static void PacketizeFlush( decoder_t * );
static void PacketizeReset( void *p_private, bool b_broken );
static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t * );
static int PacketizeValidate( void *p_private, block_t * );
static block_t *ParseMPEGBlock( decoder_t *, block_t * );
static int ParseVOL( decoder_t *, es_format_t *, uint8_t *, int );
static int ParseVO( decoder_t *, block_t * );
static int ParseVOP( decoder_t *, block_t * );
static int vlc_log2( unsigned int );
#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 RESERVED_START_CODE 0x130
#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
static const uint8_t p_mp4v_startcode[3] = { 0x00, 0x00, 0x01 };
/*****************************************************************************
* 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;
if( p_dec->fmt_in->i_codec != VLC_CODEC_MP4V )
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 )
return VLC_ENOMEM;
memset( p_sys, 0, sizeof(decoder_sys_t) );
/* Misc init */
packetizer_Init( &p_sys->packetizer,
p_mp4v_startcode, sizeof(p_mp4v_startcode), startcode_FindAnnexB,
NULL, 0, 4,
PacketizeReset, PacketizeParse, PacketizeValidate, NULL,
p_dec );
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_CODEC_MP4V;
if( p_dec->fmt_out.i_extra )
{
/* We have a vol */
msg_Dbg( p_dec, "opening with vol size: %zu", 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 );
}
/* Set callback */
p_dec->pf_packetize = Packetize;
p_dec->pf_flush = PacketizeFlush;
p_dec->pf_get_cc = NULL;
return VLC_SUCCESS;
}
/*****************************************************************************
* Close: clean up the packetizer
*****************************************************************************/
static void Close( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys = p_dec->p_sys;
packetizer_Clean( &p_sys->packetizer );
if( p_sys->p_frame )
block_ChainRelease( p_sys->p_frame );
free( 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;
return packetizer_Packetize( &p_sys->packetizer, pp_block );
}
static void PacketizeFlush( decoder_t *p_dec )
{
decoder_sys_t *p_sys = p_dec->p_sys;
packetizer_Flush( &p_sys->packetizer );
}
/*****************************************************************************
* Helpers:
*****************************************************************************/
static void PacketizeReset( void *p_private, bool b_flush )
{
decoder_t *p_dec = p_private;
decoder_sys_t *p_sys = p_dec->p_sys;
if( b_flush )
{
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->i_interpolated_pts =
p_sys->i_interpolated_dts =
p_sys->i_last_ref_pts = VLC_TICK_INVALID;
p_sys->i_last_time_ref =
p_sys->i_time_ref =
p_sys->i_last_time =
p_sys->i_last_timeincr = 0;
}
static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t *p_block )
{
decoder_t *p_dec = p_private;
const vlc_tick_t i_dts = p_block->i_dts;
const vlc_tick_t i_pts = p_block->i_pts;
block_t *p_au = ParseMPEGBlock( p_dec, p_block );
*pb_ts_used = p_au && p_au->i_dts == i_dts && p_au->i_pts == i_pts;
return p_au;
}
static int PacketizeValidate( void *p_private, block_t *p_au )
{
decoder_t *p_dec = p_private;
decoder_sys_t *p_sys = p_dec->p_sys;
/* 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 == VLC_TICK_INVALID &&
p_sys->i_interpolated_dts == VLC_TICK_INVALID )
{
msg_Dbg( p_dec, "need a starting pts/dts" );
return VLC_EGENERIC;
}
/* When starting the stream we can have the first frame with
* a null DTS (i_interpolated_pts is initialized to 0) */
if( p_au->i_dts == VLC_TICK_INVALID )
p_au->i_dts = p_au->i_pts;
return VLC_SUCCESS;
}
/*****************************************************************************
* 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;
if( p_frag->i_buffer < 4 )
return p_frag;
const uint32_t i_startcode = GetDWBE( p_frag->p_buffer );
if( i_startcode == VISUAL_OBJECT_SEQUENCE_START_CODE ||
i_startcode == VISUAL_OBJECT_SEQUENCE_END_CODE ||
i_startcode == USER_DATA_START_CODE )
{ /* VOS and USERDATA */
#if 0
/* Remove VOS start/end code from the original stream */
block_Release( p_frag );
#else
/* Append the block for now since ts/ps muxers rely on VOL
* being present in the stream */
block_ChainLastAppend( &p_sys->pp_last, p_frag );
#endif
return NULL;
}
else if( i_startcode >= VIDEO_OBJECT_LAYER_START_CODE &&
i_startcode < RESERVED_START_CODE )
{
/* Copy the complete VOL */
if( (size_t)p_dec->fmt_out.i_extra != p_frag->i_buffer ||
( p_frag->i_buffer && memcmp(p_dec->fmt_out.p_extra,
p_frag->p_buffer, p_frag->i_buffer) ) )
{
void *p_realloc = realloc( p_dec->fmt_out.p_extra, p_frag->i_buffer );
if( p_realloc )
{
p_dec->fmt_out.p_extra = p_realloc;
p_dec->fmt_out.i_extra = p_frag->i_buffer;
memcpy( p_realloc, 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 );
#if 0
/* Remove from the original stream */
block_Release( p_frag );
#else
/* Append the block for now since ts/ps muxers rely on VOL
* being present in the stream */
block_ChainLastAppend( &p_sys->pp_last, p_frag );
#endif
return NULL;
}
else
{
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( i_startcode == VISUAL_OBJECT_START_CODE )
{
ParseVO( p_dec, p_frag );
}
else
if( i_startcode == VOP_START_CODE &&
ParseVOP( p_dec, p_frag ) == VLC_SUCCESS )
{
/* We are dealing with a VOP */
p_pic = block_ChainGather( p_sys->p_frame );
p_pic->i_flags = p_sys->i_flags;
p_pic->i_pts = p_sys->i_interpolated_pts;
p_pic->i_dts = p_sys->i_interpolated_dts;
#if 0
msg_Err( p_dec, "output dts/pts (%"PRId64",%"PRId64")", p_pic->i_dts, p_pic->i_pts );
#endif
/* Reset context */
p_sys->p_frame = NULL;
p_sys->pp_last = &p_sys->p_frame;
}
return p_pic;
}
/* ParseVOL: */
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_ver_id, i_shape;
h26x_aspect_ratio_t ar;
bs_t s;
for( ;; )
{
if( i_vol <= 5 )
return VLC_EGENERIC;
uint32_t i_startcode = GetDWBE( p_vol );
if( i_startcode >= VIDEO_OBJECT_LAYER_START_CODE &&
i_startcode < RESERVED_START_CODE )
break;
p_vol++; i_vol--;
}
bs_init( &s, &p_vol[4], i_vol - 4 );
bs_skip( &s, 1 ); /* random access */
bs_skip( &s, 8 ); /* vo_type */
if( bs_read1( &s ) )
{
i_vo_ver_id = bs_read( &s, 4 );
bs_skip( &s, 3 );
}
else
{
i_vo_ver_id = 1;
}
ar.aspect_ratio_idc = bs_read( &s, 4 ) & 0xf;
if( ar.aspect_ratio_idc == 0xf )
{
ar.aspect_ratio_idc = 0xff; // was only coded on 4 bits in MPEG4
ar.sar_width = bs_read( &s, 8 );
ar.sar_height = bs_read( &s, 8 );
}
if(!p_dec->fmt_in->video.i_sar_num ||
!p_dec->fmt_in->video.i_sar_den)
{
h26x_get_aspect_ratio(&ar,
&fmt->video.i_sar_num,
&fmt->video.i_sar_den);
}
if( bs_read1( &s ) )
{
/* vol control parameter */
bs_skip( &s, 2 ); /* chroma_format */
bs_skip( &s, 1 ); /* low_delay */
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 ) ) return VLC_EGENERIC; /* Marker */
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_sys->i_fps_num - 1 ) + 1;
if( i_time_increment_bits < 1 ) i_time_increment_bits = 1;
p_sys->i_fps_den = bs_read( &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;
}
static int ParseVO( decoder_t *p_dec, block_t *p_vo )
{
bs_t s;
bs_init( &s, &p_vo->p_buffer[4], p_vo->i_buffer - 4 );
if( bs_read1( &s ) )
bs_skip( &s, 7 );
const uint8_t visual_object_type = bs_read( &s, 4 );
if( visual_object_type == 1 /* video ID */ ||
visual_object_type == 2 /* still texture ID */ )
{
h26x_colour_description_t colour =
{
.colour_primaries = 1,
.transfer_characteristics = 1,
.matrix_coeffs = 1,
.full_range_flag = 0,
};
if( bs_read1( &s ) ) /* video_signal_type */
{
bs_skip( &s, 3 );
colour.full_range_flag = bs_read( &s, 1 );
if( bs_read( &s, 1 ) ) /* colour description */
{
colour.colour_primaries = bs_read( &s, 8 );
colour.transfer_characteristics = bs_read( &s, 8 );
colour.matrix_coeffs = bs_read( &s, 8 );
}
}
if( p_dec->fmt_in->video.primaries == COLOR_PRIMARIES_UNDEF )
{
h26x_get_colorimetry( &colour,
&p_dec->fmt_out.video.primaries,
&p_dec->fmt_out.video.transfer,
&p_dec->fmt_out.video.space,
&p_dec->fmt_out.video.color_range );
}
}
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 = 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_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_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_sys->i_fps_num);
}
int64_t i_time_diff = (i_time_ref + i_time_increment) - (p_sys->i_last_time + p_sys->i_last_timeincr);
if( p_sys->i_fps_num && i_modulo_time_base == 0 && i_time_diff < 0 && -i_time_diff > p_sys->i_fps_num )
{
msg_Warn(p_dec, "missing modulo_time_base update");
i_modulo_time_base += -i_time_diff / p_sys->i_fps_num;
p_sys->i_time_ref += (i_modulo_time_base * p_sys->i_fps_num);
p_sys->i_time_ref += p_sys->i_last_timeincr % p_sys->i_fps_num;
i_time_ref = p_sys->i_time_ref;
}
if( 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 += vlc_tick_from_samples(
p_dec->fmt_in->video.i_frame_rate_base,
p_dec->fmt_in->video.i_frame_rate);
}
else if( p_sys->i_fps_num )
{
i_time_diff = (i_time_ref + i_time_increment) - (p_sys->i_last_time + p_sys->i_last_timeincr);
p_sys->i_interpolated_pts += vlc_tick_from_samples( i_time_diff, p_sys->i_fps_num );
}
#if 0
msg_Err( p_dec, "interp dts/pts (%"PRId64",%"PRId64"), dts/pts (%"PRId64",%"PRId64") %"PRId64" mod %d inc %"PRId64,
p_sys->i_interpolated_dts, p_sys->i_interpolated_pts,
p_vop->i_dts, p_vop->i_pts, p_sys->i_time_ref, i_modulo_time_base, i_time_increment );
#endif
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 != VLC_TICK_INVALID )
p_sys->i_interpolated_pts = p_vop->i_pts;
if( p_vop->i_dts != VLC_TICK_INVALID )
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 != VLC_TICK_INVALID )
p_sys->i_interpolated_dts = p_vop->i_pts;
if( p_vop->i_dts != VLC_TICK_INVALID )
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 != VLC_TICK_INVALID )
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 libavutil 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;
}