videolan
/
vlc
mirror of https://gitea.goldendeliverer.com/videolan/vlc.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
20173 Commits
7 Branches
132 Tags
718 MiB
 
 
 
 
 
 
Tree: e8a7ea23b8
Branches Tags
${ item.name }
Create tag ${ searchTerm }
Create branch ${ searchTerm }
from 'e8a7ea23b8'
${ noResults }
vlc/modules/packetizer/vc1.c

663 lines
23 KiB
Raw Blame History

/*****************************************************************************
* vc1.c
*****************************************************************************
* Copyright (C) 2001, 2002, 2006 the VideoLAN team
* $Id: copy.c 18231 2006-12-03 17:02:02Z courmisch $
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
* 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
* 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <vlc/vlc.h>
#include <vlc_codec.h>
#include <vlc_block.h>
#include "vlc_bits.h"
#include "vlc_block_helper.h"
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
vlc_module_begin();
set_category( CAT_SOUT );
set_subcategory( SUBCAT_SOUT_PACKETIZER );
set_description( _("VC-1 packetizer") );
set_capability( "packetizer", 50 );
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];
/* Current sequence header */
vlc_bool_t b_sequence_header;
struct
{
block_t *p_sh;
vlc_bool_t b_advanced_profile;
vlc_bool_t b_interlaced;
vlc_bool_t b_frame_interpolation;
vlc_bool_t b_range_reduction;
vlc_bool_t b_has_bframe;
} sh;
vlc_bool_t b_entry_point;
struct
{
block_t *p_ep;
} ep;
/* */
vlc_bool_t b_frame;
/* Current frame being built */
block_t *p_frame;
block_t **pp_last;
mtime_t i_interpolated_dts;
};
enum
{
STATE_NOSYNC,
STATE_NEXT_SYNC
};
typedef enum
{
IDU_TYPE_SEQUENCE_HEADER = 0x0f,
IDU_TYPE_ENTRY_POINT = 0x0e,
IDU_TYPE_FRAME = 0x0D,
IDU_TYPE_FIELD = 0x0C,
IDU_TYPE_SLICE = 0x0B,
IDU_TYPE_END_OF_SEQUENCE = 0x0B,
IDU_TYPE_SEQUENCE_LEVEL_USER_DATA = 0x1F,
IDU_TYPE_ENTRY_POINT_USER_DATA = 0x1E,
IDU_TYPE_FRAME_USER_DATA = 0x1D,
IDU_TYPE_FIELD_USER_DATA = 0x1C,
IDU_TYPE_SLICE_USER_DATA = 0x1B,
} idu_type_t;
static block_t *Packetize( decoder_t *p_dec, block_t **pp_block );
/*****************************************************************************
* Open: probe the packetizer and return score
*****************************************************************************
* Tries to launch a decoder and return score so that the interface is able
* to choose.
*****************************************************************************/
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_FOURCC( 'W', 'V', 'C', '1' ) )
return VLC_EGENERIC;
p_dec->pf_packetize = Packetize;
/* Create the output format */
es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
p_sys->i_state = STATE_NOSYNC;
p_sys->bytestream = block_BytestreamInit( p_dec );
p_sys->p_startcode[0] = 0x00;
p_sys->p_startcode[1] = 0x00;
p_sys->p_startcode[2] = 0x01;
p_sys->i_offset = 0;
p_sys->b_sequence_header = VLC_FALSE;
p_sys->sh.p_sh = NULL;
p_sys->b_entry_point = VLC_FALSE;
p_sys->ep.p_ep = NULL;
p_sys->b_frame = VLC_FALSE;
p_sys->p_frame = NULL;
p_sys->pp_last = &p_sys->p_frame;
p_sys->i_interpolated_dts = -1;
if( p_dec->fmt_in.i_extra > 0 )
{
block_t *p_init = block_New( p_dec, p_dec->fmt_in.i_extra );
block_t *p_pic;
memcpy( p_init->p_buffer, p_dec->fmt_in.p_extra,
p_dec->fmt_in.i_extra );
while( ( p_pic = Packetize( p_dec, &p_init ) ) )
block_Release( p_pic ); /* Should not happen (only sequence header) */
}
return VLC_SUCCESS;
}
/*****************************************************************************
* Close:
*****************************************************************************/
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;
block_BytestreamRelease( &p_sys->bytestream );
if( p_sys->p_frame )
block_Release( p_sys->p_frame );
free( p_sys );
}
/*****************************************************************************
* Packetize: packetize an access unit
*****************************************************************************/
static block_t *ParseIDU( decoder_t *p_dec, block_t *p_frag );
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;
if( pp_block == NULL || *pp_block == NULL )
return NULL;
if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
{
if( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED )
{
p_sys->i_state = STATE_NOSYNC;
block_BytestreamFlush( &p_sys->bytestream );
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 = VLC_FALSE;
}
// p_sys->i_interpolated_dts = 0;
block_Release( *pp_block );
return NULL;
}
block_BytestreamPush( &p_sys->bytestream, *pp_block );
for( ;; )
{
switch( p_sys->i_state )
{
case STATE_NOSYNC:
if( block_FindStartcodeFromOffset( &p_sys->bytestream, &p_sys->i_offset, p_sys->p_startcode, 3 ) == VLC_SUCCESS )
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_state != STATE_NEXT_SYNC )
return NULL; /* Need more data */
p_sys->i_offset = 4; /* 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 )
return NULL; /* Need more data */
/* 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;
p_pic->i_rate = p_sys->bytestream.p_block->i_rate;
block_GetBytes( &p_sys->bytestream, p_pic->p_buffer, p_pic->i_buffer );
p_sys->i_offset = 0;
/* Parse and return complete frame */
p_pic = ParseIDU( p_dec, p_pic );
/* Don't reuse the same timestamps several times */
if( p_sys->p_frame &&
p_sys->p_frame->i_dts == p_sys->bytestream.p_block->i_dts &&
p_sys->p_frame->i_pts == p_sys->bytestream.p_block->i_pts )
{
p_sys->bytestream.p_block->i_pts = -1;
p_sys->bytestream.p_block->i_dts = -1;
}
/* */
if( !p_pic )
{
p_sys->i_state = STATE_NOSYNC;
break;
}
/* */
if( 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;
}
/* 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;
}
}
}
/* DecodeRIDU: decode the startcode emulation prevention (same than h264) */
static void DecodeRIDU( uint8_t *p_ret, int *pi_ret, uint8_t *src, int i_src )
{
uint8_t *end = &src[i_src];
uint8_t *dst_end = &p_ret[*pi_ret];
uint8_t *dst = p_ret;
while( src < end && dst < dst_end )
{
if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
src[2] == 0x03 )
{
*dst++ = 0x00;
*dst++ = 0x00;
src += 3;
continue;
}
*dst++ = *src++;
}
*pi_ret = dst - p_ret;
}
/* BuildExtraData: gather sequence header and entry point */
static void BuildExtraData( decoder_t *p_dec )
{
decoder_sys_t *p_sys = p_dec->p_sys;
es_format_t *p_es = &p_dec->fmt_out;
int i_extra;
if( !p_sys->b_sequence_header || !p_sys->b_entry_point )
return;
i_extra = p_sys->sh.p_sh->i_buffer + p_sys->ep.p_ep->i_buffer;
if( p_es->i_extra != i_extra )
{
p_es->i_extra = i_extra;
p_es->p_extra = realloc( p_dec->fmt_out.p_extra, p_es->i_extra );
}
memcpy( p_es->p_extra,
p_sys->sh.p_sh->p_buffer, p_sys->sh.p_sh->i_buffer );
memcpy( (uint8_t*)p_es->p_extra + p_sys->sh.p_sh->i_buffer,
p_sys->ep.p_ep->p_buffer, p_sys->ep.p_ep->i_buffer );
}
/* ParseIDU: parse an Independant Decoding Unit */
static block_t *ParseIDU( decoder_t *p_dec, block_t *p_frag )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_pic;
const idu_type_t idu = p_frag->p_buffer[3];
if( !p_sys->b_sequence_header && idu != IDU_TYPE_SEQUENCE_HEADER )
{
msg_Warn( p_dec, "waiting for sequence header" );
block_Release( p_frag );
return NULL;
}
if( p_sys->b_sequence_header && !p_sys->b_entry_point && idu != IDU_TYPE_ENTRY_POINT )
{
msg_Warn( p_dec, "waiting for entry point" );
block_Release( p_frag );
return NULL;
}
/* TODO we do not gather ENTRY_POINT and SEQUENCE_DATA user data
* But It should not be a problem for decoder */
/* Do we have completed a frame */
p_pic = NULL;
if( p_sys->b_frame &&
idu != IDU_TYPE_FRAME_USER_DATA &&
idu != IDU_TYPE_FIELD && idu != IDU_TYPE_FIELD_USER_DATA &&
idu != IDU_TYPE_SLICE && idu != IDU_TYPE_SLICE_USER_DATA &&
idu != IDU_TYPE_END_OF_SEQUENCE )
{
/* */
p_pic = block_ChainGather( p_sys->p_frame );
/* We can interpolate dts/pts only if we have a frame rate */
if( p_dec->fmt_out.video.i_frame_rate != 0 && p_dec->fmt_out.video.i_frame_rate_base != 0 )
{
//msg_Dbg( p_dec, "-------------- XXX0 dts="I64Fd" pts="I64Fd" interpolated="I64Fd, p_pic->i_dts, p_pic->i_pts, p_sys->i_interpolated_dts );
if( p_pic->i_dts <= 0 )
p_pic->i_dts = p_sys->i_interpolated_dts;
p_sys->i_interpolated_dts += I64C(1000000) * p_dec->fmt_out.video.i_frame_rate_base / p_dec->fmt_out.video.i_frame_rate;
if( p_pic->i_pts <= 0 )
{
if( !p_sys->sh.b_has_bframe || (p_pic->i_flags & BLOCK_FLAG_TYPE_B ) )
p_pic->i_pts = p_pic->i_dts;
/* TODO compute pts for other case */
}
}
p_sys->i_interpolated_dts = p_pic->i_dts;
//msg_Dbg( p_dec, "-------------- dts="I64Fd" pts="I64Fd, p_pic->i_dts, p_pic->i_pts );
/* Reset context */
p_sys->p_frame = NULL;
p_sys->pp_last = &p_sys->p_frame;
}
/* */
if( p_sys->p_frame )
{
block_t *p_frame = p_sys->p_frame;
if( p_frame->i_dts < 0 )
p_frame->i_dts = p_frag->i_dts;
if( p_frame->i_pts < 0 )
p_frame->i_pts = p_frag->i_pts;
}
block_ChainLastAppend( &p_sys->pp_last, p_frag );
/* Parse IDU */
if( idu == IDU_TYPE_SEQUENCE_HEADER )
{
es_format_t *p_es = &p_dec->fmt_out;
bs_t s;
int i_profile;
uint8_t ridu[32];
int i_ridu = sizeof(ridu);
/* */
if( p_sys->sh.p_sh )
block_Release( p_sys->sh.p_sh );
p_sys->sh.p_sh = block_Duplicate( p_frag );
/* Extract the raw IDU */
DecodeRIDU( ridu, &i_ridu, &p_frag->p_buffer[4], p_frag->i_buffer - 4 );
/* Auto detect VC-1_SPMP_PESpacket_PayloadFormatHeader (SMPTE RP 227) for simple/main profile
* TODO find a test case and valid it */
if( i_ridu > 4 && (ridu[0]&0x80) == 0 ) /* for advanced profile, the first bit is 1 */
{
video_format_t *p_v = &p_dec->fmt_in.video;
const int i_potential_width = GetWBE( &ridu[0] );
const int i_potential_height = GetWBE( &ridu[2] );
if( i_potential_width >= 2 && i_potential_width <= 8192 &&
i_potential_height >= 2 && i_potential_height <= 8192 )
{
if( ( p_v->i_width <= 0 && p_v->i_height <= 0 ) ||
( p_v->i_width == i_potential_width && p_v->i_height == i_potential_height ) )
{
static const uint8_t startcode[4] = { 0x00, 0x00, 0x01, IDU_TYPE_SEQUENCE_HEADER };
p_es->video.i_width = i_potential_width;
p_es->video.i_height = i_potential_height;
/* Remove it */
p_frag->p_buffer += 4;
p_frag->i_buffer -= 4;
memcpy( p_frag->p_buffer, startcode, sizeof(startcode) );
}
}
}
/* Parse it */
bs_init( &s, ridu, i_ridu );
i_profile = bs_read( &s, 2 );
if( i_profile == 3 )
{
const int i_level = bs_read( &s, 3 );
/* Advanced profile */
p_sys->sh.b_advanced_profile = VLC_TRUE;
p_sys->sh.b_range_reduction = VLC_FALSE;
p_sys->sh.b_has_bframe = VLC_TRUE;
bs_skip( &s, 2+3+5+1 ); // chroma format + frame rate Q + bit rate Q + postprocflag
p_es->video.i_width = 2*bs_read( &s, 12 )+2;
p_es->video.i_height = 2*bs_read( &s, 12 )+2;
if( !p_sys->b_sequence_header )
msg_Dbg( p_dec, "found sequence header for advanced profile level L%d resolution %dx%d",
i_level, p_es->video.i_width, p_es->video.i_height);
bs_skip( &s, 1 );// pulldown
p_sys->sh.b_interlaced = bs_read( &s, 1 );
bs_skip( &s, 1 );// frame counter
p_sys->sh.b_frame_interpolation = bs_read( &s, 1 );
bs_skip( &s, 1 ); // Reserved
bs_skip( &s, 1 ); // Psf
if( bs_read( &s, 1 ) ) /* Display extension */
{
const int i_display_width = bs_read( &s, 14 )+1;
const int i_display_height = bs_read( &s, 14 )+1;
p_es->video.i_aspect = VOUT_ASPECT_FACTOR * i_display_width / i_display_height;
if( !p_sys->b_sequence_header )
msg_Dbg( p_dec, "display size %dx%d", i_display_width, i_display_height );
if( bs_read( &s, 1 ) ) /* Pixel aspect ratio (PAR/SAR) */
{
static const int p_ar[16][2] = {
{ 0, 0}, { 1, 1}, {12,11}, {10,11}, {16,11}, {40,33},
{24,11}, {20,11}, {32,11}, {80,33}, {18,11}, {15,11},
{64,33}, {160,99},{ 0, 0}, { 0, 0}
};
int i_ar = bs_read( &s, 4 );
int i_ar_w, i_ar_h;
if( i_ar == 15 )
{
i_ar_w = bs_read( &s, 8 );
i_ar_h = bs_read( &s, 8 );
}
else
{
i_ar_w = p_ar[i_ar][0];
i_ar_h = p_ar[i_ar][1];
}
vlc_ureduce( &i_ar_w, &i_ar_h, i_ar_w, i_ar_h, 0 );
if( !p_sys->b_sequence_header )
msg_Dbg( p_dec, "aspect ratio %d:%d", i_ar_w, i_ar_h );
}
}
if( bs_read( &s, 1 ) ) /* Frame rate */
{
int i_fps_num = 0;
int i_fps_den = 0;
if( bs_read( &s, 1 ) )
{
i_fps_num = bs_read( &s, 16 )+1;
i_fps_den = 32;
}
else
{
const int i_nr = bs_read( &s, 8 );
const int i_dn = bs_read( &s, 4 );
switch( i_nr )
{
case 1: i_fps_num = 24000; break;
case 2: i_fps_num = 25000; break;
case 3: i_fps_num = 30000; break;
case 4: i_fps_num = 50000; break;
case 5: i_fps_num = 60000; break;
case 6: i_fps_num = 48000; break;
case 7: i_fps_num = 72000; break;
}
switch( i_dn )
{
case 1: i_fps_den = 1000; break;
case 2: i_fps_den = 1001; break;
}
}
if( i_fps_num != 0 && i_fps_den != 0 )
vlc_ureduce( &p_es->video.i_frame_rate, &p_es->video.i_frame_rate_base, i_fps_num, i_fps_den, 0 );
if( !p_sys->b_sequence_header )
msg_Dbg( p_dec, "frame rate %d/%d", p_es->video.i_frame_rate, p_es->video.i_frame_rate_base );
}
}
else
{
/* Simple and main profile */
p_sys->sh.b_advanced_profile = VLC_FALSE;
p_sys->sh.b_interlaced = VLC_FALSE;
if( !p_sys->b_sequence_header )
msg_Dbg( p_dec, "found sequence header for %s profile", i_profile == 0 ? "simple" : "main" );
bs_skip( &s, 2+3+5+1+1+ // reserved + frame rate Q + bit rate Q + loop filter + reserved
1+1+1+1+2+ // multiresolution + reserved + fast uv mc + extended mv + dquant
1+1+1+1 ); // variable size transform + reserved + overlap + sync marker
p_sys->sh.b_range_reduction = bs_read( &s, 1 );
if( bs_read( &s, 3 ) > 0 )
p_sys->sh.b_has_bframe = VLC_TRUE;
else
p_sys->sh.b_has_bframe = VLC_FALSE;
bs_skip( &s, 2 ); // quantizer
p_sys->sh.b_frame_interpolation = bs_read( &s, 1 );
}
p_sys->b_sequence_header = VLC_TRUE;
BuildExtraData( p_dec );
}
else if( idu == IDU_TYPE_ENTRY_POINT )
{
if( p_sys->ep.p_ep )
block_Release( p_sys->ep.p_ep );
p_sys->ep.p_ep = block_Duplicate( p_frag );
p_sys->b_entry_point = VLC_TRUE;
BuildExtraData( p_dec );
}
else if( idu == IDU_TYPE_FRAME )
{
bs_t s;
uint8_t ridu[8];
int i_ridu = sizeof(ridu);
/* Extract the raw IDU */
DecodeRIDU( ridu, &i_ridu, &p_frag->p_buffer[4], p_frag->i_buffer - 4 );
/* Parse it + interpolate pts/dts if possible */
bs_init( &s, ridu, i_ridu );
if( p_sys->sh.b_advanced_profile )
{
int i_fcm = 0;
if( p_sys->sh.b_interlaced )
{
if( bs_read( &s, 1 ) )
{
if( bs_read( &s, 1 ) )
i_fcm = 1; /* interlaced field */
else
i_fcm = 2; /* interlaced frame */
}
}
if( i_fcm == 1 ) /*interlaced field */
{
/* XXX for mixed I/P we should check reference usage before marking them I (too much work) */
switch( bs_read( &s, 3 ) )
{
case 0: /* II */
case 1: /* IP */
case 2: /* PI */
p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_I;
p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_I;
p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_I;
break;
case 3: /* PP */
p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_P;
break;
case 4: /* BB */
case 5: /* BBi */
case 6: /* BiB */
case 7: /* BiBi */
p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_B;
break;
}
}
else
{
if( !bs_read( &s, 1 ) )
p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_P;
else if( !bs_read( &s, 1 ) )
p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_B;
else if( !bs_read( &s, 1 ) )
p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_I;
else if( !bs_read( &s, 1 ) )
p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_B; /* Bi */
else
p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_P; /* P Skip */
}
}
else
{
if( p_sys->sh.b_frame_interpolation )
bs_skip( &s, 1 ); // interpolate
bs_skip( &s, 2 ); // frame count
if( p_sys->sh.b_range_reduction )
bs_skip( &s, 1 ); // range reduction
if( bs_read( &s, 1 ) )
p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_P;
else if( !p_sys->sh.b_has_bframe || bs_read( &s, 1 ) )
p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_I;
else
p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_B;
}
p_sys->b_frame = VLC_TRUE;
}
return p_pic;
}