libavcodec/dolby_e_parser.c

   1 /*
   2  * Copyright (C) 2017 foo86
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "libavutil/channel_layout.h"
  22 #include "avcodec.h"
  23 #include "dolby_e.h"
  24
  25 typedef struct DBEParseContext {
  26     DBEContext dectx;
  27 } DBEParseContext;
  28
  29 static int dolby_e_parse(AVCodecParserContext *s2, AVCodecContext *avctx,
  30                         const uint8_t **poutbuf, int *poutbuf_size,
  31                         const uint8_t *buf, int buf_size)
  32 {
  33     DBEParseContext *s1 = s2->priv_data;
  34     DBEContext *s = &s1->dectx;
  35     int ret;
  36
  37     if ((ret = ff_dolby_e_parse_header(s, buf, buf_size)) < 0)
  38         goto end;
  39
  40     s2->duration = FRAME_SAMPLES;
  41     switch (s->metadata.nb_channels) {
  42     case 4:
  43         avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_4POINT0;
  44         break;
  45     case 6:
  46         avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT1;
  47         break;
  48     case 8:
  49         avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_7POINT1;
  50         break;
  51     default:
  52         avctx->ch_layout.order       = AV_CHANNEL_ORDER_UNSPEC;
  53         avctx->ch_layout.nb_channels = s->metadata.nb_channels;
  54         break;
  55     }
  56
  57     avctx->sample_rate = s->metadata.sample_rate;
  58     avctx->sample_fmt  = AV_SAMPLE_FMT_FLTP;
  59
  60 end:
  61     /* always return the full packet. this parser isn't doing any splitting or
  62        combining, only packet analysis */
  63     *poutbuf      = buf;
  64     *poutbuf_size = buf_size;
  65     return buf_size;
  66 }
  67
  68 const AVCodecParser ff_dolby_e_parser = {
  69     .codec_ids      = { AV_CODEC_ID_DOLBY_E },
  70     .priv_data_size = sizeof(DBEParseContext),
  71     .parser_parse   = dolby_e_parse,
  72 };