GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/adxdec.c Lines: 51 80 63.8 %
Date: 2019-11-18 18:00:01 Branches: 18 42 42.9 %

Line Branch Exec Source
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/*
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 * ADX ADPCM codecs
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 * Copyright (c) 2001,2003 BERO
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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 "adx.h"
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#include "get_bits.h"
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#include "internal.h"
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/**
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 * @file
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 * SEGA CRI adx codecs.
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 *
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 * Reference documents:
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 * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
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 * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
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 */
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static av_cold int adx_decode_init(AVCodecContext *avctx)
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{
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    ADXContext *c = avctx->priv_data;
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    int ret, header_size;
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    if (avctx->extradata_size >= 24) {
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        if ((ret = ff_adx_decode_header(avctx, avctx->extradata,
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                                        avctx->extradata_size, &header_size,
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                                        c->coeff)) < 0) {
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            av_log(avctx, AV_LOG_ERROR, "error parsing ADX header\n");
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            return AVERROR_INVALIDDATA;
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        }
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        c->channels      = avctx->channels;
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        c->header_parsed = 1;
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    }
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    avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
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    return 0;
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}
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/**
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 * Decode 32 samples from 18 bytes.
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 *
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 * A 16-bit scalar value is applied to 32 residuals, which then have a
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 * 2nd-order LPC filter applied to it to form the output signal for a single
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 * channel.
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 */
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33076
static int adx_decode(ADXContext *c, int16_t *out, int offset,
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                      const uint8_t *in, int ch)
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{
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33076
    ADXChannelState *prev = &c->prev[ch];
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    GetBitContext gb;
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33076
    int scale = AV_RB16(in);
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    int i;
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    int s0, s1, s2, d;
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    /* check if this is an EOF packet */
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33076
    if (scale & 0x8000)
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        return -1;
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    init_get_bits(&gb, in + 2, (BLOCK_SIZE - 2) * 8);
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33076
    out += offset;
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33076
    s1 = prev->s1;
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    s2 = prev->s2;
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1091508
    for (i = 0; i < BLOCK_SAMPLES; i++) {
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1058432
        d  = get_sbits(&gb, 4);
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        s0 = ((d * (1 << COEFF_BITS)) * scale + c->coeff[0] * s1 + c->coeff[1] * s2) >> COEFF_BITS;
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1058432
        s2 = s1;
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1058432
        s1 = av_clip_int16(s0);
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1058432
        *out++ = s1;
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    }
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    prev->s1 = s1;
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    prev->s2 = s2;
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    return 0;
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}
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static int adx_decode_frame(AVCodecContext *avctx, void *data,
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                            int *got_frame_ptr, AVPacket *avpkt)
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{
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16538
    AVFrame *frame      = data;
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16538
    int buf_size        = avpkt->size;
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16538
    ADXContext *c       = avctx->priv_data;
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    int16_t **samples;
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    int samples_offset;
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16538
    const uint8_t *buf  = avpkt->data;
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    const uint8_t *buf_end = buf + avpkt->size;
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    int num_blocks, ch, ret;
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    if (c->eof) {
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        *got_frame_ptr = 0;
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        return buf_size;
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    }
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    if (!c->header_parsed && buf_size >= 2 && AV_RB16(buf) == 0x8000) {
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        int header_size;
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        if ((ret = ff_adx_decode_header(avctx, buf, buf_size, &header_size,
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                                        c->coeff)) < 0) {
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            av_log(avctx, AV_LOG_ERROR, "error parsing ADX header\n");
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            return AVERROR_INVALIDDATA;
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        }
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        c->channels      = avctx->channels;
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        c->header_parsed = 1;
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        if (buf_size < header_size)
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            return AVERROR_INVALIDDATA;
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        buf      += header_size;
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        buf_size -= header_size;
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    }
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16538
    if (!c->header_parsed)
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        return AVERROR_INVALIDDATA;
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    /* calculate number of blocks in the packet */
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16538
    num_blocks = buf_size / (BLOCK_SIZE * c->channels);
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    /* if the packet is not an even multiple of BLOCK_SIZE, check for an EOF
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       packet */
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    if (!num_blocks || buf_size % (BLOCK_SIZE * avctx->channels)) {
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        if (buf_size >= 4 && (AV_RB16(buf) & 0x8000)) {
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            c->eof = 1;
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            *got_frame_ptr = 0;
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            return avpkt->size;
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        }
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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 = num_blocks * BLOCK_SAMPLES;
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    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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        return ret;
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    samples = (int16_t **)frame->extended_data;
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    samples_offset = 0;
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    while (num_blocks--) {
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49614
        for (ch = 0; ch < c->channels; ch++) {
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33076
            if (buf_end - buf < BLOCK_SIZE || adx_decode(c, samples[ch], samples_offset, buf, ch)) {
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                c->eof = 1;
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                buf = avpkt->data + avpkt->size;
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                break;
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            }
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            buf_size -= BLOCK_SIZE;
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33076
            buf      += BLOCK_SIZE;
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        }
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16538
        if (!c->eof)
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            samples_offset += BLOCK_SAMPLES;
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    }
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    frame->nb_samples = samples_offset;
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    *got_frame_ptr = 1;
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    return buf - avpkt->data;
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}
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static void adx_decode_flush(AVCodecContext *avctx)
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{
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    ADXContext *c = avctx->priv_data;
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    memset(c->prev, 0, sizeof(c->prev));
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    c->eof = 0;
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}
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AVCodec ff_adpcm_adx_decoder = {
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    .name           = "adpcm_adx",
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    .long_name      = NULL_IF_CONFIG_SMALL("SEGA CRI ADX ADPCM"),
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    .type           = AVMEDIA_TYPE_AUDIO,
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    .id             = AV_CODEC_ID_ADPCM_ADX,
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    .priv_data_size = sizeof(ADXContext),
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    .init           = adx_decode_init,
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    .decode         = adx_decode_frame,
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    .flush          = adx_decode_flush,
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    .capabilities   = AV_CODEC_CAP_DR1,
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    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
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                                                      AV_SAMPLE_FMT_NONE },
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};