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vlc/modules/packetizer/h264.c

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/*****************************************************************************
* h264.c: h264/avc video packetizer
*****************************************************************************
* Copyright (C) 2001, 2002, 2006 the VideoLAN team
* $Id$
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
* Eric Petit <titer@videolan.org>
* Gildas Bazin <gbazin@videolan.org>
* Derk-Jan Hartman <hartman at videolan dot 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
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_sout.h>
#include <vlc_codec.h>
#include <vlc_block.h>
#include <vlc_block_helper.h>
#include <vlc_bits.h>
#include "../codec/cc.h"
#include "packetizer_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( N_("H.264 video packetizer") )
set_capability( "packetizer", 50 )
set_callbacks( Open, Close )
vlc_module_end ()
/****************************************************************************
* Local prototypes
****************************************************************************/
typedef struct
{
int i_nal_type;
int i_nal_ref_idc;
int i_frame_type;
int i_pic_parameter_set_id;
int i_frame_num;
int i_field_pic_flag;
int i_bottom_field_flag;
int i_idr_pic_id;
int i_pic_order_cnt_lsb;
int i_delta_pic_order_cnt_bottom;
int i_delta_pic_order_cnt0;
int i_delta_pic_order_cnt1;
} slice_t;
#define SPS_MAX (32)
#define PPS_MAX (256)
struct decoder_sys_t
{
/* */
packetizer_t packetizer;
/* */
bool b_slice;
block_t *p_frame;
bool b_frame_sps;
bool b_frame_pps;
bool b_header;
bool b_sps;
bool b_pps;
block_t *pp_sps[SPS_MAX];
block_t *pp_pps[PPS_MAX];
/* avcC data */
int i_avcC_length_size;
/* Useful values of the Sequence Parameter Set */
int i_log2_max_frame_num;
int b_frame_mbs_only;
int i_pic_order_cnt_type;
int i_delta_pic_order_always_zero_flag;
int i_log2_max_pic_order_cnt_lsb;
/* Value from Picture Parameter Set */
int i_pic_order_present_flag;
/* Useful values of the Slice Header */
slice_t slice;
/* */
mtime_t i_frame_pts;
mtime_t i_frame_dts;
/* */
uint32_t i_cc_flags;
mtime_t i_cc_pts;
mtime_t i_cc_dts;
cc_data_t cc;
cc_data_t cc_next;
};
enum nal_unit_type_e
{
NAL_UNKNOWN = 0,
NAL_SLICE = 1,
NAL_SLICE_DPA = 2,
NAL_SLICE_DPB = 3,
NAL_SLICE_DPC = 4,
NAL_SLICE_IDR = 5, /* ref_idc != 0 */
NAL_SEI = 6, /* ref_idc == 0 */
NAL_SPS = 7,
NAL_PPS = 8,
NAL_AU_DELIMITER= 9
/* ref_idc == 0 for 6,9,10,11,12 */
};
enum nal_priority_e
{
NAL_PRIORITY_DISPOSABLE = 0,
NAL_PRIORITY_LOW = 1,
NAL_PRIORITY_HIGH = 2,
NAL_PRIORITY_HIGHEST = 3,
};
#define BLOCK_FLAG_PRIVATE_AUD (1 << BLOCK_FLAG_PRIVATE_SHIFT)
static block_t *Packetize( decoder_t *, block_t ** );
static block_t *PacketizeAVC1( decoder_t *, block_t ** );
static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] );
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 *ParseNALBlock( decoder_t *, bool *pb_used_ts, block_t * );
static block_t *CreateAnnexbNAL( decoder_t *, const uint8_t *p, int );
static block_t *OutputPicture( decoder_t *p_dec );
static void PutSPS( decoder_t *p_dec, block_t *p_frag );
static void PutPPS( decoder_t *p_dec, block_t *p_frag );
static void ParseSlice( decoder_t *p_dec, bool *pb_new_picture, slice_t *p_slice,
int i_nal_ref_idc, int i_nal_type, const block_t *p_frag );
static void ParseSei( decoder_t *, block_t * );
static const uint8_t p_h264_startcode[3] = { 0x00, 0x00, 0x01 };
/*****************************************************************************
* Open: probe the packetizer and return score
* When opening after demux, the packetizer is only loaded AFTER the decoder
* That means that what you set in fmt_out is ignored by the decoder in this special case
*****************************************************************************/
static int Open( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys;
int i;
if( p_dec->fmt_in.i_codec != VLC_CODEC_H264 )
return VLC_EGENERIC;
if( p_dec->fmt_in.i_original_fourcc == VLC_FOURCC( 'a', 'v', 'c', '1') &&
p_dec->fmt_in.i_extra < 7 )
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;
}
packetizer_Init( &p_sys->packetizer,
p_h264_startcode, sizeof(p_h264_startcode),
p_h264_startcode, 1, 5,
PacketizeReset, PacketizeParse, PacketizeValidate, p_dec );
p_sys->b_slice = false;
p_sys->p_frame = NULL;
p_sys->b_frame_sps = false;
p_sys->b_frame_pps = false;
p_sys->b_header= false;
p_sys->b_sps = false;
p_sys->b_pps = false;
for( i = 0; i < SPS_MAX; i++ )
p_sys->pp_sps[i] = NULL;
for( i = 0; i < PPS_MAX; i++ )
p_sys->pp_pps[i] = NULL;
p_sys->slice.i_nal_type = -1;
p_sys->slice.i_nal_ref_idc = -1;
p_sys->slice.i_idr_pic_id = -1;
p_sys->slice.i_frame_num = -1;
p_sys->slice.i_frame_type = 0;
p_sys->slice.i_pic_parameter_set_id = -1;
p_sys->slice.i_field_pic_flag = 0;
p_sys->slice.i_bottom_field_flag = -1;
p_sys->slice.i_pic_order_cnt_lsb = -1;
p_sys->slice.i_delta_pic_order_cnt_bottom = -1;
p_sys->i_frame_dts = VLC_TS_INVALID;
p_sys->i_frame_pts = VLC_TS_INVALID;
/* Setup properties */
es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
p_dec->fmt_out.i_codec = VLC_CODEC_H264;
if( p_dec->fmt_in.i_original_fourcc == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
{
/* This type of stream is produced by mp4 and matroska
* when we want to store it in another streamformat, you need to convert
* The fmt_in.p_extra should ALWAYS contain the avcC
* The fmt_out.p_extra should contain all the SPS and PPS with 4 byte startcodes */
uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
int i_sps, i_pps;
bool b_dummy;
int i;
/* Parse avcC */
p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
/* Read SPS */
i_sps = (*p++)&0x1f;
for( i = 0; i < i_sps; i++ )
{
uint16_t i_length = GetWBE( p ); p += 2;
if( i_length >
(uint8_t*)p_dec->fmt_in.p_extra + p_dec->fmt_in.i_extra - p )
{
return VLC_EGENERIC;
}
block_t *p_sps = CreateAnnexbNAL( p_dec, p, i_length );
if( !p_sps )
return VLC_EGENERIC;
ParseNALBlock( p_dec, &b_dummy, p_sps );
p += i_length;
}
/* Read PPS */
i_pps = *p++;
for( i = 0; i < i_pps; i++ )
{
uint16_t i_length = GetWBE( p ); p += 2;
if( i_length >
(uint8_t*)p_dec->fmt_in.p_extra + p_dec->fmt_in.i_extra - p )
{
return VLC_EGENERIC;
}
block_t *p_pps = CreateAnnexbNAL( p_dec, p, i_length );
if( !p_pps )
return VLC_EGENERIC;
ParseNALBlock( p_dec, &b_dummy, p_pps );
p += i_length;
}
msg_Dbg( p_dec, "avcC length size=%d, sps=%d, pps=%d",
p_sys->i_avcC_length_size, i_sps, i_pps );
if( !p_sys->b_sps || !p_sys->b_pps )
return VLC_EGENERIC;
/* FIXME: FFMPEG isn't happy at all if you leave this */
if( p_dec->fmt_out.i_extra > 0 )
free( p_dec->fmt_out.p_extra );
p_dec->fmt_out.i_extra = 0;
p_dec->fmt_out.p_extra = NULL;
/* Set the new extradata */
for( i = 0; i < SPS_MAX; i++ )
{
if( p_sys->pp_sps[i] )
p_dec->fmt_out.i_extra += p_sys->pp_sps[i]->i_buffer;
}
for( i = 0; i < PPS_MAX; i++ )
{
if( p_sys->pp_pps[i] )
p_dec->fmt_out.i_extra += p_sys->pp_pps[i]->i_buffer;
}
p_dec->fmt_out.p_extra = malloc( p_dec->fmt_out.i_extra );
if( p_dec->fmt_out.p_extra )
{
uint8_t *p_dst = p_dec->fmt_out.p_extra;
for( i = 0; i < SPS_MAX; i++ )
{
if( p_sys->pp_sps[i] )
{
memcpy( p_dst, p_sys->pp_sps[i]->p_buffer, p_sys->pp_sps[i]->i_buffer );
p_dst += p_sys->pp_sps[i]->i_buffer;
}
}
for( i = 0; i < PPS_MAX; i++ )
{
if( p_sys->pp_pps[i] )
{
memcpy( p_dst, p_sys->pp_pps[i]->p_buffer, p_sys->pp_pps[i]->i_buffer );
p_dst += p_sys->pp_pps[i]->i_buffer;
}
}
p_sys->b_header = true;
}
else
{
p_dec->fmt_out.i_extra = 0;
}
/* Set callback */
p_dec->pf_packetize = PacketizeAVC1;
/* TODO CC ? */
}
else
{
/* This type of stream contains data with 3 of 4 byte startcodes
* The fmt_in.p_extra MAY contain SPS/PPS with 4 byte startcodes
* The fmt_out.p_extra should be the same */
/* Set callback */
p_dec->pf_packetize = Packetize;
p_dec->pf_get_cc = GetCc;
/* */
p_sys->i_cc_pts = VLC_TS_INVALID;
p_sys->i_cc_dts = VLC_TS_INVALID;
p_sys->i_cc_flags = 0;
cc_Init( &p_sys->cc );
cc_Init( &p_sys->cc_next );
/* */
if( p_dec->fmt_in.i_extra > 0 )
packetizer_Header( &p_sys->packetizer,
p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra );
}
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;
int i;
if( p_sys->p_frame )
block_ChainRelease( p_sys->p_frame );
for( i = 0; i < SPS_MAX; i++ )
{
if( p_sys->pp_sps[i] )
block_Release( p_sys->pp_sps[i] );
}
for( i = 0; i < PPS_MAX; i++ )
{
if( p_sys->pp_pps[i] )
block_Release( p_sys->pp_pps[i] );
}
packetizer_Clean( &p_sys->packetizer );
if( p_dec->pf_get_cc )
{
cc_Exit( &p_sys->cc_next );
cc_Exit( &p_sys->cc );
}
free( p_sys );
}
/****************************************************************************
* Packetize: the whole thing
* Search for the startcodes 3 or more bytes
* Feed ParseNALBlock ALWAYS with 4 byte startcode prepended NALs
****************************************************************************/
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 );
}
/****************************************************************************
* PacketizeAVC1: Takes VCL blocks of data and creates annexe B type NAL stream
* Will always use 4 byte 0 0 0 1 startcodes
* Will prepend a SPS and PPS before each keyframe
****************************************************************************/
static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_block;
block_t *p_ret = NULL;
uint8_t *p;
if( !pp_block || !*pp_block )
return NULL;
if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
{
block_Release( *pp_block );
return NULL;
}
p_block = *pp_block;
*pp_block = NULL;
for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
{
block_t *p_pic;
bool b_dummy;
int i_size = 0;
int i;
for( i = 0; i < p_sys->i_avcC_length_size; i++ )
{
i_size = (i_size << 8) | (*p++);
}
if( i_size <= 0 ||
i_size > ( p_block->p_buffer + p_block->i_buffer - p ) )
{
msg_Err( p_dec, "Broken frame : size %d is too big", i_size );
break;
}
block_t *p_part = CreateAnnexbNAL( p_dec, p, i_size );
if( !p_part )
break;
p_part->i_dts = p_block->i_dts;
p_part->i_pts = p_block->i_pts;
/* Parse the NAL */
if( ( p_pic = ParseNALBlock( p_dec, &b_dummy, p_part ) ) )
{
block_ChainAppend( &p_ret, p_pic );
}
p += i_size;
}
block_Release( p_block );
return p_ret;
}
/*****************************************************************************
* GetCc:
*****************************************************************************/
static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_cc;
for( int i = 0; i < 4; i++ )
pb_present[i] = p_sys->cc.pb_present[i];
if( p_sys->cc.i_data <= 0 )
return NULL;
p_cc = block_New( p_dec, p_sys->cc.i_data);
if( p_cc )
{
memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
p_cc->i_dts =
p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
p_cc->i_flags = ( p_sys->cc.b_reorder ? p_sys->i_cc_flags : BLOCK_FLAG_TYPE_P ) & BLOCK_FLAG_TYPE_MASK;
}
cc_Flush( &p_sys->cc );
return p_cc;
}
/****************************************************************************
* Helpers
****************************************************************************/
static void PacketizeReset( void *p_private, bool b_broken )
{
decoder_t *p_dec = p_private;
decoder_sys_t *p_sys = p_dec->p_sys;
if( b_broken )
{
if( p_sys->p_frame )
block_ChainRelease( p_sys->p_frame );
p_sys->p_frame = NULL;
p_sys->b_frame_sps = false;
p_sys->b_frame_pps = false;
p_sys->slice.i_frame_type = 0;
p_sys->b_slice = false;
}
p_sys->i_frame_pts = VLC_TS_INVALID;
p_sys->i_frame_dts = VLC_TS_INVALID;
}
static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t *p_block )
{
decoder_t *p_dec = p_private;
/* Remove trailing 0 bytes */
while( p_block->i_buffer > 5 && p_block->p_buffer[p_block->i_buffer-1] == 0x00 )
p_block->i_buffer--;
return ParseNALBlock( p_dec, pb_ts_used, p_block );
}
static int PacketizeValidate( void *p_private, block_t *p_au )
{
VLC_UNUSED(p_private);
VLC_UNUSED(p_au);
return VLC_SUCCESS;
}
static block_t *CreateAnnexbNAL( decoder_t *p_dec, const uint8_t *p, int i_size )
{
block_t *p_nal;
p_nal = block_New( p_dec, 4 + i_size );
if( !p_nal ) return NULL;
/* Add start code */
p_nal->p_buffer[0] = 0x00;
p_nal->p_buffer[1] = 0x00;
p_nal->p_buffer[2] = 0x00;
p_nal->p_buffer[3] = 0x01;
/* Copy nalu */
memcpy( &p_nal->p_buffer[4], p, i_size );
VLC_UNUSED(p_dec);
return p_nal;
}
static void CreateDecodedNAL( uint8_t **pp_ret, int *pi_ret,
const uint8_t *src, int i_src )
{
const uint8_t *end = &src[i_src];
uint8_t *dst = malloc( i_src );
*pp_ret = dst;
if( dst )
{
while( src < 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 - *pp_ret;
}
static inline int bs_read_ue( bs_t *s )
{
int i = 0;
while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
{
i++;
}
return( ( 1 << i) - 1 + bs_read( s, i ) );
}
static inline int bs_read_se( bs_t *s )
{
int val = bs_read_ue( s );
return val&0x01 ? (val+1)/2 : -(val/2);
}
/*****************************************************************************
* ParseNALBlock: parses annexB type NALs
* All p_frag blocks are required to start with 0 0 0 1 4-byte startcode
*****************************************************************************/
static block_t *ParseNALBlock( decoder_t *p_dec, bool *pb_used_ts, block_t *p_frag )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_pic = NULL;
const int i_nal_ref_idc = (p_frag->p_buffer[4] >> 5)&0x03;
const int i_nal_type = p_frag->p_buffer[4]&0x1f;
const mtime_t i_frag_dts = p_frag->i_dts;
const mtime_t i_frag_pts = p_frag->i_pts;
if( p_sys->b_slice && ( !p_sys->b_sps || !p_sys->b_pps ) )
{
block_ChainRelease( p_sys->p_frame );
msg_Warn( p_dec, "waiting for SPS/PPS" );
/* Reset context */
p_sys->slice.i_frame_type = 0;
p_sys->p_frame = NULL;
p_sys->b_frame_sps = false;
p_sys->b_frame_pps = false;
p_sys->b_slice = false;
cc_Flush( &p_sys->cc_next );
}
if( ( !p_sys->b_sps || !p_sys->b_pps ) &&
i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
{
p_sys->b_slice = true;
/* Fragment will be discarded later on */
}
else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
{
slice_t slice;
bool b_new_picture;
ParseSlice( p_dec, &b_new_picture, &slice, i_nal_ref_idc, i_nal_type, p_frag );
/* */
if( b_new_picture && p_sys->b_slice )
p_pic = OutputPicture( p_dec );
/* */
p_sys->slice = slice;
p_sys->b_slice = true;
}
else if( i_nal_type == NAL_SPS )
{
if( p_sys->b_slice )
p_pic = OutputPicture( p_dec );
p_sys->b_frame_sps = true;
PutSPS( p_dec, p_frag );
/* Do not append the SPS because we will insert it on keyframes */
p_frag = NULL;
}
else if( i_nal_type == NAL_PPS )
{
if( p_sys->b_slice )
p_pic = OutputPicture( p_dec );
p_sys->b_frame_pps = true;
PutPPS( p_dec, p_frag );
/* Do not append the PPS because we will insert it on keyframes */
p_frag = NULL;
}
else if( i_nal_type == NAL_AU_DELIMITER ||
i_nal_type == NAL_SEI ||
( i_nal_type >= 13 && i_nal_type <= 18 ) )
{
if( p_sys->b_slice )
p_pic = OutputPicture( p_dec );
/* Parse SEI for CC support */
if( i_nal_type == NAL_SEI )
{
ParseSei( p_dec, p_frag );
}
else if( i_nal_type == NAL_AU_DELIMITER )
{
if( p_sys->p_frame && (p_sys->p_frame->i_flags & BLOCK_FLAG_PRIVATE_AUD) )
{
block_Release( p_frag );
p_frag = NULL;
}
else
{
p_frag->i_flags |= BLOCK_FLAG_PRIVATE_AUD;
}
}
}
/* Append the block */
if( p_frag )
block_ChainAppend( &p_sys->p_frame, p_frag );
*pb_used_ts = false;
if( p_sys->i_frame_dts <= VLC_TS_INVALID &&
p_sys->i_frame_pts <= VLC_TS_INVALID )
{
p_sys->i_frame_dts = i_frag_dts;
p_sys->i_frame_pts = i_frag_pts;
*pb_used_ts = true;
}
return p_pic;
}
static block_t *OutputPicture( decoder_t *p_dec )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_pic;
if( !p_sys->b_header && p_sys->slice.i_frame_type != BLOCK_FLAG_TYPE_I)
return NULL;
const bool b_sps_pps_i = p_sys->slice.i_frame_type == BLOCK_FLAG_TYPE_I &&
p_sys->b_sps &&
p_sys->b_pps;
if( b_sps_pps_i || p_sys->b_frame_sps || p_sys->b_frame_pps )
{
block_t *p_head = NULL;
if( p_sys->p_frame->i_flags & BLOCK_FLAG_PRIVATE_AUD )
{
p_head = p_sys->p_frame;
p_sys->p_frame = p_sys->p_frame->p_next;
}
block_t *p_list = NULL;
for( int i = 0; i < SPS_MAX && (b_sps_pps_i || p_sys->b_frame_sps); i++ )
{
if( p_sys->pp_sps[i] )
block_ChainAppend( &p_list, block_Duplicate( p_sys->pp_sps[i] ) );
}
for( int i = 0; i < PPS_MAX && (b_sps_pps_i || p_sys->b_frame_pps); i++ )
{
if( p_sys->pp_pps[i] )
block_ChainAppend( &p_list, block_Duplicate( p_sys->pp_pps[i] ) );
}
if( b_sps_pps_i && p_list )
p_sys->b_header = true;
if( p_head )
p_head->p_next = p_list;
else
p_head = p_list;
block_ChainAppend( &p_head, p_sys->p_frame );
p_pic = block_ChainGather( p_head );
}
else
{
p_pic = block_ChainGather( p_sys->p_frame );
}
p_pic->i_dts = p_sys->i_frame_dts;
p_pic->i_pts = p_sys->i_frame_pts;
p_pic->i_length = 0; /* FIXME */
p_pic->i_flags |= p_sys->slice.i_frame_type;
p_pic->i_flags &= ~BLOCK_FLAG_PRIVATE_AUD;
p_sys->slice.i_frame_type = 0;
p_sys->p_frame = NULL;
p_sys->i_frame_dts = VLC_TS_INVALID;
p_sys->i_frame_pts = VLC_TS_INVALID;
p_sys->b_frame_sps = false;
p_sys->b_frame_pps = false;
p_sys->b_slice = false;
/* CC */
p_sys->i_cc_pts = p_pic->i_pts;
p_sys->i_cc_dts = p_pic->i_dts;
p_sys->i_cc_flags = p_pic->i_flags;
/* Swap cc buffer */
cc_data_t cc_tmp = p_sys->cc;
p_sys->cc = p_sys->cc_next;
p_sys->cc_next = cc_tmp;
cc_Flush( &p_sys->cc_next );
return p_pic;
}
static void PutSPS( decoder_t *p_dec, block_t *p_frag )
{
decoder_sys_t *p_sys = p_dec->p_sys;
uint8_t *pb_dec = NULL;
int i_dec = 0;
bs_t s;
int i_tmp;
int i_sps_id;
CreateDecodedNAL( &pb_dec, &i_dec, &p_frag->p_buffer[5],
p_frag->i_buffer - 5 );
bs_init( &s, pb_dec, i_dec );
int i_profile_idc = bs_read( &s, 8 );
p_dec->fmt_out.i_profile = i_profile_idc;
/* Skip constraint_set0123, reserved(4) */
bs_skip( &s, 1+1+1+1 + 4 );
p_dec->fmt_out.i_level = bs_read( &s, 8 );
/* sps id */
i_sps_id = bs_read_ue( &s );
if( i_sps_id >= SPS_MAX )
{
msg_Warn( p_dec, "invalid SPS (sps_id=%d)", i_sps_id );
free( pb_dec );
block_Release( p_frag );
return;
}
if( i_profile_idc == 100 || i_profile_idc == 110 ||
i_profile_idc == 122 || i_profile_idc == 244 ||
i_profile_idc == 44 || i_profile_idc == 83 ||
i_profile_idc == 86 )
{
/* chroma_format_idc */
const int i_chroma_format_idc = bs_read_ue( &s );
if( i_chroma_format_idc == 3 )
bs_skip( &s, 1 ); /* seperate_colour_plane_flag */
/* bit_depth_luma_minus8 */
bs_read_ue( &s );
/* bit_depth_chroma_minus8 */
bs_read_ue( &s );
/* qpprime_y_zero_transform_bypass_flag */
bs_skip( &s, 1 );
/* seq_scaling_matrix_present_flag */
i_tmp = bs_read( &s, 1 );
if( i_tmp )
{
for( int i = 0; i < ((3 != i_chroma_format_idc) ? 8 : 12); i++ )
{
/* seq_scaling_list_present_flag[i] */
i_tmp = bs_read( &s, 1 );
if( !i_tmp )
continue;
const int i_size_of_scaling_list = (i < 6 ) ? 16 : 64;
/* scaling_list (...) */
int i_lastscale = 8;
int i_nextscale = 8;
for( int j = 0; j < i_size_of_scaling_list; j++ )
{
if( i_nextscale != 0 )
{
/* delta_scale */
i_tmp = bs_read_se( &s );
i_nextscale = ( i_lastscale + i_tmp + 256 ) % 256;
/* useDefaultScalingMatrixFlag = ... */
}
/* scalinglist[j] */
i_lastscale = ( i_nextscale == 0 ) ? i_lastscale : i_nextscale;
}
}
}
}
/* Skip i_log2_max_frame_num */
p_sys->i_log2_max_frame_num = bs_read_ue( &s );
if( p_sys->i_log2_max_frame_num > 12)
p_sys->i_log2_max_frame_num = 12;
/* Read poc_type */
p_sys->i_pic_order_cnt_type = bs_read_ue( &s );
if( p_sys->i_pic_order_cnt_type == 0 )
{
/* skip i_log2_max_poc_lsb */
p_sys->i_log2_max_pic_order_cnt_lsb = bs_read_ue( &s );
if( p_sys->i_log2_max_pic_order_cnt_lsb > 12 )
p_sys->i_log2_max_pic_order_cnt_lsb = 12;
}
else if( p_sys->i_pic_order_cnt_type == 1 )
{
int i_cycle;
/* skip b_delta_pic_order_always_zero */
p_sys->i_delta_pic_order_always_zero_flag = bs_read( &s, 1 );
/* skip i_offset_for_non_ref_pic */
bs_read_se( &s );
/* skip i_offset_for_top_to_bottom_field */
bs_read_se( &s );
/* read i_num_ref_frames_in_poc_cycle */
i_cycle = bs_read_ue( &s );
if( i_cycle > 256 ) i_cycle = 256;
while( i_cycle > 0 )
{
/* skip i_offset_for_ref_frame */
bs_read_se(&s );
i_cycle--;
}
}
/* i_num_ref_frames */
bs_read_ue( &s );
/* b_gaps_in_frame_num_value_allowed */
bs_skip( &s, 1 );
/* Read size */
p_dec->fmt_out.video.i_width = 16 * ( bs_read_ue( &s ) + 1 );
p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );
/* b_frame_mbs_only */
p_sys->b_frame_mbs_only = bs_read( &s, 1 );
if( p_sys->b_frame_mbs_only == 0 )
{
bs_skip( &s, 1 );
}
/* b_direct8x8_inference */
bs_skip( &s, 1 );
/* crop */
i_tmp = bs_read( &s, 1 );
if( i_tmp )
{
/* left */
bs_read_ue( &s );
/* right */
bs_read_ue( &s );
/* top */
bs_read_ue( &s );
/* bottom */
bs_read_ue( &s );
}
/* vui */
i_tmp = bs_read( &s, 1 );
if( i_tmp )
{
/* read the aspect ratio part if any */
i_tmp = bs_read( &s, 1 );
if( i_tmp )
{
static const struct { int w, h; } sar[17] =
{
{ 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 }, { 4, 3 }, { 3, 2 },
{ 2, 1 },
};
int i_sar = bs_read( &s, 8 );
int w, h;
if( i_sar < 17 )
{
w = sar[i_sar].w;
h = sar[i_sar].h;
}
else if( i_sar == 255 )
{
w = bs_read( &s, 16 );
h = bs_read( &s, 16 );
}
else
{
w = 0;
h = 0;
}
if( w != 0 && h != 0 )
{
p_dec->fmt_out.video.i_sar_num = w;
p_dec->fmt_out.video.i_sar_den = h;
}
else
{
p_dec->fmt_out.video.i_sar_num = 1;
p_dec->fmt_out.video.i_sar_den = 1;
}
}
}
free( pb_dec );
/* We have a new SPS */
if( !p_sys->b_sps )
msg_Dbg( p_dec, "found NAL_SPS (sps_id=%d)", i_sps_id );
p_sys->b_sps = true;
if( p_sys->pp_sps[i_sps_id] )
block_Release( p_sys->pp_sps[i_sps_id] );
p_sys->pp_sps[i_sps_id] = p_frag;
}
static void PutPPS( decoder_t *p_dec, block_t *p_frag )
{
decoder_sys_t *p_sys = p_dec->p_sys;
bs_t s;
int i_pps_id;
int i_sps_id;
bs_init( &s, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
i_pps_id = bs_read_ue( &s ); // pps id
i_sps_id = bs_read_ue( &s ); // sps id
if( i_pps_id >= PPS_MAX || i_sps_id >= SPS_MAX )
{
msg_Warn( p_dec, "invalid PPS (pps_id=%d sps_id=%d)", i_pps_id, i_sps_id );
block_Release( p_frag );
return;
}
bs_skip( &s, 1 ); // entropy coding mode flag
p_sys->i_pic_order_present_flag = bs_read( &s, 1 );
/* TODO */
/* We have a new PPS */
if( !p_sys->b_pps )
msg_Dbg( p_dec, "found NAL_PPS (pps_id=%d sps_id=%d)", i_pps_id, i_sps_id );
p_sys->b_pps = true;
if( p_sys->pp_pps[i_pps_id] )
block_Release( p_sys->pp_pps[i_pps_id] );
p_sys->pp_pps[i_pps_id] = p_frag;
}
static void ParseSlice( decoder_t *p_dec, bool *pb_new_picture, slice_t *p_slice,
int i_nal_ref_idc, int i_nal_type, const block_t *p_frag )
{
decoder_sys_t *p_sys = p_dec->p_sys;
uint8_t *pb_dec;
int i_dec;
int i_first_mb, i_slice_type;
slice_t slice;
bs_t s;
/* do not convert the whole frame */
CreateDecodedNAL( &pb_dec, &i_dec, &p_frag->p_buffer[5],
__MIN( p_frag->i_buffer - 5, 60 ) );
bs_init( &s, pb_dec, i_dec );
/* first_mb_in_slice */
i_first_mb = bs_read_ue( &s );
/* slice_type */
switch( (i_slice_type = bs_read_ue( &s )) )
{
case 0: case 5:
slice.i_frame_type = BLOCK_FLAG_TYPE_P;
break;
case 1: case 6:
slice.i_frame_type = BLOCK_FLAG_TYPE_B;
break;
case 2: case 7:
slice.i_frame_type = BLOCK_FLAG_TYPE_I;
break;
case 3: case 8: /* SP */
slice.i_frame_type = BLOCK_FLAG_TYPE_P;
break;
case 4: case 9:
slice.i_frame_type = BLOCK_FLAG_TYPE_I;
break;
default:
slice.i_frame_type = 0;
break;
}
/* */
slice.i_nal_type = i_nal_type;
slice.i_nal_ref_idc = i_nal_ref_idc;
slice.i_pic_parameter_set_id = bs_read_ue( &s );
slice.i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );
slice.i_field_pic_flag = 0;
slice.i_bottom_field_flag = -1;
if( !p_sys->b_frame_mbs_only )
{
/* field_pic_flag */
slice.i_field_pic_flag = bs_read( &s, 1 );
if( slice.i_field_pic_flag )
slice.i_bottom_field_flag = bs_read( &s, 1 );
}
slice.i_idr_pic_id = p_sys->slice.i_idr_pic_id;
if( slice.i_nal_type == NAL_SLICE_IDR )
slice.i_idr_pic_id = bs_read_ue( &s );
slice.i_pic_order_cnt_lsb = -1;
slice.i_delta_pic_order_cnt_bottom = -1;
slice.i_delta_pic_order_cnt0 = 0;
slice.i_delta_pic_order_cnt1 = 0;
if( p_sys->i_pic_order_cnt_type == 0 )
{
slice.i_pic_order_cnt_lsb = bs_read( &s, p_sys->i_log2_max_pic_order_cnt_lsb + 4 );
if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
slice.i_delta_pic_order_cnt_bottom = bs_read_se( &s );
}
else if( (p_sys->i_pic_order_cnt_type == 1) &&
(!p_sys->i_delta_pic_order_always_zero_flag) )
{
slice.i_delta_pic_order_cnt0 = bs_read_se( &s );
if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
slice.i_delta_pic_order_cnt1 = bs_read_se( &s );
}
free( pb_dec );
/* Detection of the first VCL NAL unit of a primary coded picture
* (cf. 7.4.1.2.4) */
bool b_pic = false;
if( slice.i_frame_num != p_sys->slice.i_frame_num ||
slice.i_pic_parameter_set_id != p_sys->slice.i_pic_parameter_set_id ||
slice.i_field_pic_flag != p_sys->slice.i_field_pic_flag ||
slice.i_nal_ref_idc != p_sys->slice.i_nal_ref_idc )
b_pic = true;
if( (slice.i_bottom_field_flag != -1) &&
(p_sys->slice.i_bottom_field_flag != -1) &&
(slice.i_bottom_field_flag != p_sys->slice.i_bottom_field_flag) )
b_pic = true;
if( p_sys->i_pic_order_cnt_type == 0 &&
( slice.i_pic_order_cnt_lsb != p_sys->slice.i_pic_order_cnt_lsb ||
slice.i_delta_pic_order_cnt_bottom != p_sys->slice.i_delta_pic_order_cnt_bottom ) )
b_pic = true;
else if( p_sys->i_pic_order_cnt_type == 1 &&
( slice.i_delta_pic_order_cnt0 != p_sys->slice.i_delta_pic_order_cnt0 ||
slice.i_delta_pic_order_cnt1 != p_sys->slice.i_delta_pic_order_cnt1 ) )
b_pic = true;
if( ( slice.i_nal_type == NAL_SLICE_IDR || p_sys->slice.i_nal_type == NAL_SLICE_IDR ) &&
( slice.i_nal_type != p_sys->slice.i_nal_type || slice.i_idr_pic_id != p_sys->slice.i_idr_pic_id ) )
b_pic = true;
/* */
*pb_new_picture = b_pic;
*p_slice = slice;
}
static void ParseSei( decoder_t *p_dec, block_t *p_frag )
{
decoder_sys_t *p_sys = p_dec->p_sys;
uint8_t *pb_dec;
int i_dec;
/* */
CreateDecodedNAL( &pb_dec, &i_dec, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
if( !pb_dec )
return;
/* The +1 is for rbsp trailing bits */
for( int i_used = 0; i_used+1 < i_dec; )
{
/* Read type */
int i_type = 0;
while( i_used+1 < i_dec )
{
const int i_byte = pb_dec[i_used++];
i_type += i_byte;
if( i_byte != 0xff )
break;
}
/* Read size */
int i_size = 0;
while( i_used+1 < i_dec )
{
const int i_byte = pb_dec[i_used++];
i_size += i_byte;
if( i_byte != 0xff )
break;
}
/* Check room */
if( i_used + i_size + 1 > i_dec )
break;
/* Look for user_data_registered_itu_t_t35 */
if( i_type == 4 )
{
static const uint8_t p_dvb1_data_start_code[] = {
0xb5,
0x00, 0x31,
0x47, 0x41, 0x39, 0x34
};
const int i_t35 = i_size;
const uint8_t *p_t35 = &pb_dec[i_used];
/* Check for we have DVB1_data() */
if( i_t35 >= 5 &&
!memcmp( p_t35, p_dvb1_data_start_code, sizeof(p_dvb1_data_start_code) ) )
{
cc_Extract( &p_sys->cc_next, true, &p_t35[3], i_t35 - 3 );
}
}
i_used += i_size;
}
free( pb_dec );
}