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/*****************************************************************************
* avparser.c
*****************************************************************************
* Copyright (C) 2015 VLC authors and VideoLAN
* $Id: fdc4573b191ee9bf3b3907e3a2cda0059e48f944 $
*
* Authors: Denis Charmet <typx@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_codec.h>
#include <vlc_block.h>
#include "../codec/avcodec/avcodec.h"
#include "../codec/avcodec/avcommon.h"
#include "avparser.h"
#if !LIBAVCODEC_VERSION_CHECK( 55, 52, 0, 63, 100 )
#include <libavutil/mem.h>
static inline void avcodec_free_context( AVCodecContext **ctx )
{
if( !*ctx )
return;
av_free( (*ctx)->extradata );
av_free( *ctx );
*ctx = NULL;
}
#endif
/*****************************************************************************
* Module descriptor
*****************************************************************************/
#ifndef MERGE_FFMPEG
vlc_module_begin ()
AVPARSER_MODULE
vlc_module_end ()
#endif
/*****************************************************************************
* Local prototypes
*****************************************************************************/
struct decoder_sys_t
{
AVCodecParserContext * p_parser_ctx;
AVCodecContext * p_codec_ctx;
int i_offset;
};
static block_t * Packetize( decoder_t *, block_t ** );
/*****************************************************************************
* OpenPacketizer: probe the packetizer and return score
*****************************************************************************
* Tries to launch a decoder and return score so that the interface is able
* to choose.
*****************************************************************************/
int OpenPacketizer( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys;
/* Restrict to VP9 for now */
if( p_dec->fmt_in.i_codec != VLC_CODEC_VP9 )
return VLC_EGENERIC;
unsigned i_avcodec_id;
if( !GetFfmpegCodec( p_dec->fmt_in.i_codec, NULL, &i_avcodec_id, NULL ) )
return VLC_EGENERIC;
/* init avcodec */
vlc_init_avcodec(p_this);
/* It is less likely to have a parser than a codec, start by that */
AVCodecParserContext * p_ctx = av_parser_init( i_avcodec_id );
if( !p_ctx )
return VLC_EGENERIC;
AVCodec * p_codec = avcodec_find_decoder( i_avcodec_id );
if( unlikely( !p_codec ) )
{
av_parser_close( p_ctx );
return VLC_EGENERIC;
}
AVCodecContext * p_codec_ctx = avcodec_alloc_context3( p_codec );
if( unlikely( !p_codec_ctx ) )
{
av_parser_close( p_ctx );
return VLC_ENOMEM;
}
p_dec->p_sys = p_sys = malloc( sizeof(*p_sys) );
if( unlikely( !p_sys ) )
{
avcodec_free_context( &p_codec_ctx );
av_parser_close( p_ctx );
return VLC_ENOMEM;
}
p_dec->pf_packetize = Packetize;
p_sys->p_parser_ctx = p_ctx;
p_sys->p_codec_ctx = p_codec_ctx;
p_sys->i_offset = 0;
es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
return VLC_SUCCESS;
}
/*****************************************************************************
* ClosePacketizer:
*****************************************************************************/
void ClosePacketizer( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
avcodec_free_context( &p_dec->p_sys->p_codec_ctx );
av_parser_close( p_dec->p_sys->p_parser_ctx );
es_format_Clean( &p_dec->fmt_out );
free( p_dec->p_sys );
}
/*****************************************************************************
* Packetize: packetize a frame
*****************************************************************************/
static block_t *Packetize ( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
if( pp_block == NULL || *pp_block == NULL )
return NULL;
if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
{
block_Release( *pp_block );
return NULL;
}
block_t * p_block = *pp_block;
uint8_t * p_indata = p_block->p_buffer + p_sys->i_offset;
int i_inlen = p_block->i_buffer - p_sys->i_offset;
uint8_t * p_outdata;
int i_outlen;
if( p_sys->i_offset == i_inlen )
goto out;
p_sys->i_offset += av_parser_parse2( p_sys->p_parser_ctx, p_sys->p_codec_ctx,
&p_outdata, &i_outlen, p_indata, i_inlen,
p_block->i_pts, p_block->i_dts, -1);
if( unlikely( i_outlen <= 0 || !p_outdata ) )
goto out;
block_t * p_ret = block_Alloc( i_outlen );
if( unlikely ( !p_ret ) )
goto out;
memcpy( p_ret->p_buffer, p_outdata, i_outlen );
p_ret->i_pts = p_block->i_pts;
p_ret->i_dts = p_block->i_dts;
p_block->i_pts = p_block->i_dts = VLC_TS_INVALID;
return p_ret;
out:
p_sys->i_offset = 0;
block_Release( *pp_block );
*pp_block = NULL;
return NULL;
}
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