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114 lines
3.6 KiB
114 lines
3.6 KiB
/*****************************************************************************
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* hxxx_common.c: AVC/HEVC packetizers shared code
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*****************************************************************************
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* Copyright (C) 2001-2015 VLC authors and VideoLAN
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#include "hxxx_common.h"
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#include <vlc_block.h>
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#include <vlc_codec.h>
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/****************************************************************************
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* PacketizeXXC1: Takes VCL blocks of data and creates annexe B type NAL stream
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* Will always use 4 byte 0 0 0 1 startcodes
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* Will prepend a SPS and PPS before each keyframe
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****************************************************************************/
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block_t *PacketizeXXC1( decoder_t *p_dec, uint8_t i_nal_length_size,
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block_t **pp_block, pf_annexb_nal_packetizer pf_nal_parser )
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{
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block_t *p_block;
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block_t *p_ret = NULL;
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uint8_t *p;
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if( !pp_block || !*pp_block )
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return NULL;
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if( (*pp_block)->i_flags&(BLOCK_FLAG_CORRUPTED) )
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{
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block_Release( *pp_block );
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return NULL;
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}
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p_block = *pp_block;
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*pp_block = NULL;
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for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
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{
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bool b_dummy;
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int i_size = 0;
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int i;
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for( i = 0; i < i_nal_length_size; i++ )
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{
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i_size = (i_size << 8) | (*p++);
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}
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if( i_size <= 0 ||
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i_size > ( p_block->p_buffer + p_block->i_buffer - p ) )
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{
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msg_Err( p_dec, "Broken frame : size %d is too big", i_size );
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break;
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}
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/* Convert AVC to AnnexB */
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block_t *p_nal;
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/* If data exactly match remaining bytes (1 NAL only or trailing one) */
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if( i_size == p_block->p_buffer + p_block->i_buffer - p )
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{
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p_block->i_buffer = i_size;
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p_block->p_buffer = p;
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p_nal = block_Realloc( p_block, 4, i_size );
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if( p_nal )
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p_block = NULL;
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}
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else
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{
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p_nal = block_Alloc( 4 + i_size );
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if( p_nal )
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{
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p_nal->i_dts = p_block->i_dts;
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p_nal->i_pts = p_block->i_pts;
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/* Copy nalu */
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memcpy( &p_nal->p_buffer[4], p, i_size );
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}
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p += i_size;
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}
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if( !p_nal )
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break;
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/* Add start code */
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p_nal->p_buffer[0] = 0x00;
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p_nal->p_buffer[1] = 0x00;
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p_nal->p_buffer[2] = 0x00;
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p_nal->p_buffer[3] = 0x01;
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/* Parse the NAL */
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block_t *p_pic;
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if( ( p_pic = pf_nal_parser( p_dec, &b_dummy, p_nal ) ) )
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{
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block_ChainAppend( &p_ret, p_pic );
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}
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if( !p_block )
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break;
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}
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if( p_block )
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block_Release( p_block );
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return p_ret;
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}
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