GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/bmvaudio.c Lines: 25 29 86.2 %
Date: 2021-01-26 11:44:58 Branches: 6 8 75.0 %

Line Branch Exec Source
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/*
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 * Discworld II BMV audio decoder
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 * Copyright (c) 2011 Konstantin Shishkov
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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/channel_layout.h"
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#include "libavutil/common.h"
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#include "avcodec.h"
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#include "internal.h"
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static const int bmv_aud_mults[16] = {
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    16512, 8256, 4128, 2064, 1032, 516, 258, 192, 129, 88, 64, 56, 48, 40, 36, 32
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};
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static av_cold int bmv_aud_decode_init(AVCodecContext *avctx)
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{
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    avctx->channels       = 2;
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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 bmv_aud_decode_frame(AVCodecContext *avctx, void *data,
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                                int *got_frame_ptr, AVPacket *avpkt)
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{
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    AVFrame *frame     = data;
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    const uint8_t *buf = avpkt->data;
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    int buf_size = avpkt->size;
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    int blocks = 0, total_blocks, i;
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    int ret;
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    int16_t *output_samples;
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    int scale[2];
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    total_blocks = *buf++;
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    if (buf_size < total_blocks * 65 + 1) {
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        av_log(avctx, AV_LOG_ERROR, "expected %d bytes, got %d\n",
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               total_blocks * 65 + 1, buf_size);
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        return AVERROR_INVALIDDATA;
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    }
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    /* get output buffer */
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    frame->nb_samples = total_blocks * 32;
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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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    for (blocks = 0; blocks < total_blocks; blocks++) {
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1322
        uint8_t code = *buf++;
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1322
        code = (code >> 1) | (code << 7);
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1322
        scale[0] = bmv_aud_mults[code & 0xF];
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1322
        scale[1] = bmv_aud_mults[code >> 4];
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        for (i = 0; i < 32; i++) {
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42304
            *output_samples++ = av_clip_int16((scale[0] * (int8_t)*buf++) >> 5);
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42304
            *output_samples++ = av_clip_int16((scale[1] * (int8_t)*buf++) >> 5);
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        }
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    }
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    *got_frame_ptr = 1;
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    return buf_size;
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}
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AVCodec ff_bmv_audio_decoder = {
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    .name           = "bmv_audio",
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    .long_name      = NULL_IF_CONFIG_SMALL("Discworld II BMV audio"),
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    .type           = AVMEDIA_TYPE_AUDIO,
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    .id             = AV_CODEC_ID_BMV_AUDIO,
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    .init           = bmv_aud_decode_init,
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    .decode         = bmv_aud_decode_frame,
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    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
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};