GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/pafaudio.c Lines: 21 25 84.0 %
Date: 2019-11-18 18:00:01 Branches: 9 12 75.0 %

Line Branch Exec Source
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/*
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 * Packed Animation File audio decoder
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 * Copyright (c) 2012 Paul B Mahol
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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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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "mathops.h"
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#include "paf.h"
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static av_cold int paf_audio_init(AVCodecContext *avctx)
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{
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    if (avctx->channels != 2) {
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        av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
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        return AVERROR_INVALIDDATA;
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    }
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    avctx->channel_layout = AV_CH_LAYOUT_STEREO;
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    avctx->sample_fmt     = AV_SAMPLE_FMT_S16;
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    return 0;
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}
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static int paf_audio_decode(AVCodecContext *avctx, void *data,
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                            int *got_frame, AVPacket *pkt)
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{
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    AVFrame *frame = data;
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    int16_t *output_samples;
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    const uint8_t *src = pkt->data;
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    int frames, ret, i, j;
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    int16_t cb[256];
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    frames = pkt->size / PAF_SOUND_FRAME_SIZE;
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    if (frames < 1)
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        return AVERROR_INVALIDDATA;
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    frame->nb_samples = PAF_SOUND_SAMPLES * frames;
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    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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        return ret;
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    output_samples = (int16_t *)frame->data[0];
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    // codebook of 256 16-bit samples and 8-bit indices to it
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    for (j = 0; j < frames; j++) {
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        for (i = 0; i < 256; i++)
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            cb[i] = sign_extend(AV_RL16(src + i * 2), 16);
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        src += 256 * 2;
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        // always 2 channels
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        for (i = 0; i < PAF_SOUND_SAMPLES * 2; i++)
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            *output_samples++ = cb[*src++];
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    }
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    *got_frame = 1;
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    return pkt->size;
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}
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AVCodec ff_paf_audio_decoder = {
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    .name         = "paf_audio",
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    .long_name    = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Audio"),
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    .type         = AVMEDIA_TYPE_AUDIO,
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    .id           = AV_CODEC_ID_PAF_AUDIO,
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    .init         = paf_audio_init,
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    .decode       = paf_audio_decode,
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    .capabilities = AV_CODEC_CAP_DR1,
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};