modules/packetizer/avparser.c

   1 /*****************************************************************************
   2  * avparser.c
   3  *****************************************************************************
   4  * Copyright (C) 2015 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Denis Charmet <typx@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_codec.h>
  35 #include <vlc_block.h>
  36
  37 #include "../codec/avcodec/avcodec.h"
  38 #include "../codec/avcodec/avcommon.h"
  39
  40 #include "avparser.h"
  41 /*****************************************************************************
  42  * Module descriptor
  43  *****************************************************************************/
  44 #ifndef MERGE_FFMPEG
  45 vlc_module_begin ()
  46     AVPARSER_MODULE
  47 vlc_module_end ()
  48 #endif
  49
  50 /*****************************************************************************
  51  * Local prototypes
  52  *****************************************************************************/
  53 struct decoder_sys_t
  54 {
  55     AVCodecParserContext * p_parser_ctx;
  56     AVCodecContext * p_codec_ctx;
  57     int i_offset;
  58 };
  59
  60 static block_t * Packetize( decoder_t *, block_t ** );
  61 static block_t * PacketizeClosed( decoder_t *, block_t ** );
  62
  63 /*****************************************************************************
  64  * FlushPacketizer: reopen as there's no clean way to flush avparser
  65  *****************************************************************************/
  66 static void FlushPacketizer( decoder_t *p_dec )
  67 {
  68     ClosePacketizer( VLC_OBJECT( p_dec ) );
  69     p_dec->p_sys = NULL;
  70     int res = OpenPacketizer( VLC_OBJECT( p_dec ) );
  71     if ( res != VLC_SUCCESS )
  72     {
  73         msg_Err( p_dec, "failed to flush with error %d", res );
  74         p_dec->pf_packetize = PacketizeClosed;
  75     }
  76 }
  77
  78 /*****************************************************************************
  79  * OpenPacketizer: probe the packetizer and return score
  80  *****************************************************************************
  81  * Tries to launch a decoder and return score so that the interface is able
  82  * to choose.
  83  *****************************************************************************/
  84 int OpenPacketizer( vlc_object_t *p_this )
  85 {
  86     decoder_t     *p_dec = (decoder_t*)p_this;
  87     decoder_sys_t *p_sys;
  88
  89     /* Restrict to VP9 for now */
  90     if( p_dec->fmt_in.i_codec != VLC_CODEC_VP9 )
  91         return VLC_EGENERIC;
  92
  93     unsigned i_avcodec_id;
  94
  95     if( !GetFfmpegCodec( p_dec->fmt_in.i_cat, p_dec->fmt_in.i_codec,
  96                          &i_avcodec_id, NULL ) )
  97         return VLC_EGENERIC;
  98
  99     /* init avcodec */
 100     vlc_init_avcodec(p_this);
 101
 102     /* It is less likely to have a parser than a codec, start by that */
 103     AVCodecParserContext * p_ctx = av_parser_init( i_avcodec_id );
 104     if( !p_ctx )
 105         return VLC_EGENERIC;
 106
 107     AVCodec * p_codec = avcodec_find_decoder( i_avcodec_id );
 108     if( unlikely( !p_codec ) )
 109     {
 110         av_parser_close( p_ctx );
 111         return VLC_EGENERIC;
 112     }
 113
 114     AVCodecContext * p_codec_ctx = avcodec_alloc_context3( p_codec );
 115     if( unlikely( !p_codec_ctx ) )
 116     {
 117         av_parser_close( p_ctx );
 118         return VLC_ENOMEM;
 119     }
 120
 121     p_dec->p_sys = p_sys = malloc( sizeof(*p_sys) );
 122
 123     if( unlikely( !p_sys ) )
 124     {
 125         avcodec_free_context( &p_codec_ctx );
 126         av_parser_close( p_ctx );
 127         return VLC_ENOMEM;
 128     }
 129     p_dec->pf_packetize = Packetize;
 130     p_dec->pf_flush = FlushPacketizer;
 131     p_sys->p_parser_ctx = p_ctx;
 132     p_sys->p_codec_ctx = p_codec_ctx;
 133     p_sys->i_offset = 0;
 134     es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
 135
 136     return VLC_SUCCESS;
 137 }
 138
 139 /*****************************************************************************
 140  * ClosePacketizer:
 141  *****************************************************************************/
 142 void ClosePacketizer( vlc_object_t *p_this )
 143 {
 144     decoder_t     *p_dec = (decoder_t*)p_this;
 145     if (likely( p_dec->p_sys != NULL ))
 146     {
 147         avcodec_free_context( &p_dec->p_sys->p_codec_ctx );
 148         av_parser_close( p_dec->p_sys->p_parser_ctx );
 149         free( p_dec->p_sys );
 150     }
 151 }
 152
 153 /*****************************************************************************
 154  * Packetize: packetize a frame
 155  *****************************************************************************/
 156 static block_t *Packetize ( decoder_t *p_dec, block_t **pp_block )
 157 {
 158     decoder_sys_t *p_sys = p_dec->p_sys;
 159
 160     if( pp_block == NULL || *pp_block == NULL )
 161         return NULL;
 162     if( (*pp_block)->i_flags&(BLOCK_FLAG_CORRUPTED) )
 163     {
 164         block_Release( *pp_block );
 165         return NULL;
 166     }
 167
 168     block_t * p_block = *pp_block;
 169
 170     uint8_t * p_indata = p_block->p_buffer + p_sys->i_offset;
 171     int i_inlen = p_block->i_buffer -  p_sys->i_offset;
 172     uint8_t * p_outdata;
 173     int i_outlen;
 174
 175     if( p_sys->i_offset == i_inlen )
 176         goto out;
 177
 178     p_sys->i_offset += av_parser_parse2( p_sys->p_parser_ctx, p_sys->p_codec_ctx,
 179                                          &p_outdata, &i_outlen, p_indata, i_inlen,
 180                                          p_block->i_pts, p_block->i_dts, -1);
 181
 182     if( unlikely( i_outlen <= 0 || !p_outdata ) )
 183         goto out;
 184
 185     block_t * p_ret = block_Alloc( i_outlen );
 186
 187     if( unlikely ( !p_ret ) )
 188         goto out;
 189
 190     memcpy( p_ret->p_buffer, p_outdata, i_outlen );
 191     p_ret->i_pts = p_block->i_pts;
 192     p_ret->i_dts = p_block->i_dts;
 193
 194     p_block->i_pts = p_block->i_dts = VLC_TS_INVALID;
 195
 196     return p_ret;
 197
 198 out:
 199     p_sys->i_offset = 0;
 200     block_Release( *pp_block );
 201     *pp_block = NULL;
 202     return NULL;
 203 }
 204
 205 /*****************************************************************************
 206  * PacketizeClosed: packetizer called after a flush failed
 207  *****************************************************************************/
 208 static block_t *PacketizeClosed ( decoder_t *p_dec, block_t **pp_block )
 209 {
 210     (void) p_dec;
 211     if( pp_block != NULL && *pp_block != NULL )
 212         block_Release( *pp_block );
 213     return NULL;
 214 }
 215