LCOV - code coverage report
Current view: top level - libavcodec - dsddec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 30 0.0 %
Date: 2017-12-18 06:23:41 Functions: 0 2 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Direct Stream Digital (DSD) decoder
       3             :  * based on BSD licensed dsd2pcm by Sebastian Gesemann
       4             :  * Copyright (c) 2009, 2011 Sebastian Gesemann. All rights reserved.
       5             :  * Copyright (c) 2014 Peter Ross
       6             :  *
       7             :  * This file is part of FFmpeg.
       8             :  *
       9             :  * FFmpeg is free software; you can redistribute it and/or
      10             :  * modify it under the terms of the GNU Lesser General Public
      11             :  * License as published by the Free Software Foundation; either
      12             :  * version 2.1 of the License, or (at your option) any later version.
      13             :  *
      14             :  * FFmpeg 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 GNU
      17             :  * Lesser General Public License for more details.
      18             :  *
      19             :  * You should have received a copy of the GNU Lesser General Public
      20             :  * License along with FFmpeg; if not, write to the Free Software
      21             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      22             :  */
      23             : 
      24             : /**
      25             :  * @file
      26             :  * Direct Stream Digital (DSD) decoder
      27             :  */
      28             : 
      29             : #include "libavcodec/internal.h"
      30             : #include "libavcodec/mathops.h"
      31             : #include "avcodec.h"
      32             : #include "dsd.h"
      33             : 
      34             : #define DSD_SILENCE 0x69
      35             : /* 0x69 = 01101001
      36             :  * This pattern "on repeat" makes a low energy 352.8 kHz tone
      37             :  * and a high energy 1.0584 MHz tone which should be filtered
      38             :  * out completely by any playback system --> silence
      39             :  */
      40             : 
      41           0 : static av_cold int decode_init(AVCodecContext *avctx)
      42             : {
      43             :     DSDContext * s;
      44             :     int i;
      45             :     uint8_t silence;
      46             : 
      47           0 :     ff_init_dsd_data();
      48             : 
      49           0 :     s = av_malloc_array(sizeof(DSDContext), avctx->channels);
      50           0 :     if (!s)
      51           0 :         return AVERROR(ENOMEM);
      52             : 
      53           0 :     silence = avctx->codec_id == AV_CODEC_ID_DSD_LSBF || avctx->codec_id == AV_CODEC_ID_DSD_LSBF_PLANAR ? ff_reverse[DSD_SILENCE] : DSD_SILENCE;
      54           0 :     for (i = 0; i < avctx->channels; i++) {
      55           0 :         s[i].pos = 0;
      56           0 :         memset(s[i].buf, silence, sizeof(s[i].buf));
      57             :     }
      58             : 
      59           0 :     avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
      60           0 :     avctx->priv_data  = s;
      61           0 :     return 0;
      62             : }
      63             : 
      64           0 : static int decode_frame(AVCodecContext *avctx, void *data,
      65             :                         int *got_frame_ptr, AVPacket *avpkt)
      66             : {
      67           0 :     DSDContext * s = avctx->priv_data;
      68           0 :     AVFrame *frame = data;
      69             :     int ret, i;
      70           0 :     int lsbf = avctx->codec_id == AV_CODEC_ID_DSD_LSBF || avctx->codec_id == AV_CODEC_ID_DSD_LSBF_PLANAR;
      71             :     int src_next;
      72             :     int src_stride;
      73             : 
      74           0 :     frame->nb_samples = avpkt->size / avctx->channels;
      75             : 
      76           0 :     if (avctx->codec_id == AV_CODEC_ID_DSD_LSBF_PLANAR || avctx->codec_id == AV_CODEC_ID_DSD_MSBF_PLANAR) {
      77           0 :         src_next   = frame->nb_samples;
      78           0 :         src_stride = 1;
      79             :     } else {
      80           0 :         src_next   = 1;
      81           0 :         src_stride = avctx->channels;
      82             :     }
      83             : 
      84           0 :     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
      85           0 :         return ret;
      86             : 
      87           0 :     for (i = 0; i < avctx->channels; i++) {
      88           0 :         float * dst = ((float **)frame->extended_data)[i];
      89           0 :         ff_dsd2pcm_translate(&s[i], frame->nb_samples, lsbf,
      90           0 :             avpkt->data + i * src_next, src_stride,
      91             :             dst, 1);
      92             :     }
      93             : 
      94           0 :     *got_frame_ptr = 1;
      95           0 :     return frame->nb_samples * avctx->channels;
      96             : }
      97             : 
      98             : #define DSD_DECODER(id_, name_, long_name_) \
      99             : AVCodec ff_##name_##_decoder = { \
     100             :     .name         = #name_, \
     101             :     .long_name    = NULL_IF_CONFIG_SMALL(long_name_), \
     102             :     .type         = AVMEDIA_TYPE_AUDIO, \
     103             :     .id           = AV_CODEC_ID_##id_, \
     104             :     .init         = decode_init, \
     105             :     .decode       = decode_frame, \
     106             :     .sample_fmts  = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP, \
     107             :                                                    AV_SAMPLE_FMT_NONE }, \
     108             : };
     109             : 
     110             : DSD_DECODER(DSD_LSBF, dsd_lsbf, "DSD (Direct Stream Digital), least significant bit first")
     111             : DSD_DECODER(DSD_MSBF, dsd_msbf, "DSD (Direct Stream Digital), most significant bit first")
     112             : DSD_DECODER(DSD_MSBF_PLANAR, dsd_msbf_planar, "DSD (Direct Stream Digital), most significant bit first, planar")
     113             : DSD_DECODER(DSD_LSBF_PLANAR, dsd_lsbf_planar, "DSD (Direct Stream Digital), least significant bit first, planar")

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