GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/adxenc.c Lines: 89 99 89.9 %
Date: 2019-11-22 03:34:36 Branches: 33 38 86.8 %

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 "avcodec.h"
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#include "adx.h"
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#include "bytestream.h"
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#include "internal.h"
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#include "put_bits.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 void adx_encode(ADXContext *c, uint8_t *adx, const int16_t *wav,
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                       ADXChannelState *prev, int channels)
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{
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    PutBitContext pb;
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    int scale;
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    int i, j;
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    int s0, s1, s2, d;
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    int max = 0;
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    int min = 0;
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    s1 = prev->s1;
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    s2 = prev->s2;
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    for (i = 0, j = 0; j < 32; i += channels, j++) {
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        s0 = wav[i];
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        d = ((s0 << COEFF_BITS) - c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS;
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        if (max < d)
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            max = d;
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        if (min > d)
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            min = d;
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        s2 = s1;
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        s1 = s0;
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    }
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    if (max == 0 && min == 0) {
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        prev->s1 = s1;
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        prev->s2 = s2;
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        memset(adx, 0, BLOCK_SIZE);
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        return;
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    }
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    if (max / 7 > -min / 8)
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        scale = max / 7;
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    else
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        scale = -min / 8;
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    if (scale == 0)
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        scale = 1;
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    AV_WB16(adx, scale);
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    init_put_bits(&pb, adx + 2, 16);
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    s1 = prev->s1;
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    s2 = prev->s2;
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    for (i = 0, j = 0; j < 32; i += channels, j++) {
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        d = ((wav[i] << COEFF_BITS) - c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS;
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        d = av_clip_intp2(ROUNDED_DIV(d, scale), 3);
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        put_sbits(&pb, 4, d);
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        s0 = ((d << COEFF_BITS) * scale + c->coeff[0] * s1 + c->coeff[1] * s2) >> COEFF_BITS;
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        s2 = s1;
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        s1 = s0;
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    }
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    prev->s1 = s1;
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    prev->s2 = s2;
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    flush_put_bits(&pb);
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}
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#define HEADER_SIZE 36
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static int adx_encode_header(AVCodecContext *avctx, uint8_t *buf, int bufsize)
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{
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    ADXContext *c = avctx->priv_data;
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    bytestream_put_be16(&buf, 0x8000);              /* header signature */
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    bytestream_put_be16(&buf, HEADER_SIZE - 4);     /* copyright offset */
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    bytestream_put_byte(&buf, 3);                   /* encoding */
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    bytestream_put_byte(&buf, BLOCK_SIZE);          /* block size */
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    bytestream_put_byte(&buf, 4);                   /* sample size */
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    bytestream_put_byte(&buf, avctx->channels);     /* channels */
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    bytestream_put_be32(&buf, avctx->sample_rate);  /* sample rate */
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    bytestream_put_be32(&buf, 0);                   /* total sample count */
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    bytestream_put_be16(&buf, c->cutoff);           /* cutoff frequency */
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    bytestream_put_byte(&buf, 3);                   /* version */
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    bytestream_put_byte(&buf, 0);                   /* flags */
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    bytestream_put_be32(&buf, 0);                   /* unknown */
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    bytestream_put_be32(&buf, 0);                   /* loop enabled */
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    bytestream_put_be16(&buf, 0);                   /* padding */
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    bytestream_put_buffer(&buf, "(c)CRI", 6);       /* copyright signature */
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    return HEADER_SIZE;
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}
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static av_cold int adx_encode_init(AVCodecContext *avctx)
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{
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    ADXContext *c = avctx->priv_data;
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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(EINVAL);
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    }
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    avctx->frame_size = BLOCK_SAMPLES;
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    /* the cutoff can be adjusted, but this seems to work pretty well */
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    c->cutoff = 500;
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    ff_adx_calculate_coeffs(c->cutoff, avctx->sample_rate, COEFF_BITS, c->coeff);
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    return 0;
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}
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static int adx_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
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                            const AVFrame *frame, int *got_packet_ptr)
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{
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    ADXContext *c          = avctx->priv_data;
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    const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
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    uint8_t *dst;
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    int ch, out_size, ret;
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    if (!samples) {
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        if (c->eof)
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            return 0;
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        if ((ret = ff_alloc_packet2(avctx, avpkt, 18, 0)) < 0)
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            return ret;
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        c->eof = 1;
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        dst = avpkt->data;
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        bytestream_put_be16(&dst, 0x8001);
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        bytestream_put_be16(&dst, 0x000E);
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        bytestream_put_be64(&dst, 0x0);
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        bytestream_put_be32(&dst, 0x0);
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        bytestream_put_be16(&dst, 0x0);
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        *got_packet_ptr = 1;
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        return 0;
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    }
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    out_size = BLOCK_SIZE * avctx->channels + !c->header_parsed * HEADER_SIZE;
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    if ((ret = ff_alloc_packet2(avctx, avpkt, out_size, 0)) < 0)
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        return ret;
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    dst = avpkt->data;
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    if (!c->header_parsed) {
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        int hdrsize;
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        if ((hdrsize = adx_encode_header(avctx, dst, avpkt->size)) < 0) {
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            av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
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            return AVERROR(EINVAL);
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        }
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        dst      += hdrsize;
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        c->header_parsed = 1;
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    }
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    for (ch = 0; ch < avctx->channels; ch++) {
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        adx_encode(c, dst, samples + ch, &c->prev[ch], avctx->channels);
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        dst += BLOCK_SIZE;
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    }
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    avpkt->pts = frame->pts;
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    avpkt->duration = frame->nb_samples;
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    *got_packet_ptr = 1;
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    return 0;
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}
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AVCodec ff_adpcm_adx_encoder = {
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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_encode_init,
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    .encode2        = adx_encode_frame,
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    .capabilities   = AV_CODEC_CAP_DELAY,
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    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
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                                                      AV_SAMPLE_FMT_NONE },
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};