GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/dsddec.c Lines: 0 39 0.0 %
Date: 2020-09-25 23:16:12 Branches: 0 20 0.0 %

Line Branch Exec Source
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/*
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 * Direct Stream Digital (DSD) decoder
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 * based on BSD licensed dsd2pcm by Sebastian Gesemann
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 * Copyright (c) 2009, 2011 Sebastian Gesemann. All rights reserved.
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 * Copyright (c) 2014 Peter Ross
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg 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 GNU
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 * 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
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * Direct Stream Digital (DSD) decoder
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 */
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#include "libavcodec/internal.h"
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#include "libavcodec/mathops.h"
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#include "avcodec.h"
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#include "dsd.h"
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#define DSD_SILENCE 0x69
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/* 0x69 = 01101001
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 * This pattern "on repeat" makes a low energy 352.8 kHz tone
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 * and a high energy 1.0584 MHz tone which should be filtered
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 * out completely by any playback system --> silence
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 */
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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    DSDContext * s;
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    int i;
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    uint8_t silence;
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    if (!avctx->channels)
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        return AVERROR_INVALIDDATA;
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    ff_init_dsd_data();
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    s = av_malloc_array(sizeof(DSDContext), avctx->channels);
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    if (!s)
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        return AVERROR(ENOMEM);
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    silence = avctx->codec_id == AV_CODEC_ID_DSD_LSBF || avctx->codec_id == AV_CODEC_ID_DSD_LSBF_PLANAR ? ff_reverse[DSD_SILENCE] : DSD_SILENCE;
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    for (i = 0; i < avctx->channels; i++) {
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        s[i].pos = 0;
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        memset(s[i].buf, silence, sizeof(s[i].buf));
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    }
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    avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
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    avctx->priv_data  = s;
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    return 0;
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}
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typedef struct ThreadData {
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    AVFrame *frame;
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    AVPacket *avpkt;
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} ThreadData;
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static int dsd_channel(AVCodecContext *avctx, void *tdata, int j, int threadnr)
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{
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    int lsbf = avctx->codec_id == AV_CODEC_ID_DSD_LSBF || avctx->codec_id == AV_CODEC_ID_DSD_LSBF_PLANAR;
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    DSDContext *s = avctx->priv_data;
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    ThreadData *td = tdata;
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    AVFrame *frame = td->frame;
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    AVPacket *avpkt = td->avpkt;
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    int src_next, src_stride;
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    float *dst = ((float **)frame->extended_data)[j];
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    if (avctx->codec_id == AV_CODEC_ID_DSD_LSBF_PLANAR || avctx->codec_id == AV_CODEC_ID_DSD_MSBF_PLANAR) {
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        src_next   = frame->nb_samples;
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        src_stride = 1;
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    } else {
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        src_next   = 1;
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        src_stride = avctx->channels;
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    }
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    ff_dsd2pcm_translate(&s[j], frame->nb_samples, lsbf,
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                         avpkt->data + j * src_next, src_stride,
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                         dst, 1);
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    return 0;
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}
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static int decode_frame(AVCodecContext *avctx, void *data,
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                        int *got_frame_ptr, AVPacket *avpkt)
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{
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    ThreadData td;
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    AVFrame *frame = data;
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    int ret;
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    frame->nb_samples = avpkt->size / avctx->channels;
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    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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        return ret;
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    td.frame = frame;
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    td.avpkt = avpkt;
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    avctx->execute2(avctx, dsd_channel, &td, NULL, avctx->channels);
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    *got_frame_ptr = 1;
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    return frame->nb_samples * avctx->channels;
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}
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#define DSD_DECODER(id_, name_, long_name_) \
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AVCodec ff_##name_##_decoder = { \
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    .name         = #name_, \
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    .long_name    = NULL_IF_CONFIG_SMALL(long_name_), \
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    .type         = AVMEDIA_TYPE_AUDIO, \
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    .id           = AV_CODEC_ID_##id_, \
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    .init         = decode_init, \
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    .decode       = decode_frame, \
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    .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS, \
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    .sample_fmts  = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP, \
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                                                   AV_SAMPLE_FMT_NONE }, \
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};
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DSD_DECODER(DSD_LSBF, dsd_lsbf, "DSD (Direct Stream Digital), least significant bit first")
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DSD_DECODER(DSD_MSBF, dsd_msbf, "DSD (Direct Stream Digital), most significant bit first")
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DSD_DECODER(DSD_MSBF_PLANAR, dsd_msbf_planar, "DSD (Direct Stream Digital), most significant bit first, planar")
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DSD_DECODER(DSD_LSBF_PLANAR, dsd_lsbf_planar, "DSD (Direct Stream Digital), least significant bit first, planar")