GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/g722dec.c Lines: 40 42 95.2 %
Date: 2019-11-18 18:00:01 Branches: 6 8 75.0 %

Line Branch Exec Source
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/*
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 * Copyright (c) CMU 1993 Computer Science, Speech Group
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 *                        Chengxiang Lu and Alex Hauptmann
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 * Copyright (c) 2005 Steve Underwood <steveu at coppice.org>
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 * Copyright (c) 2009 Kenan Gillet
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 * Copyright (c) 2010 Martin Storsjo
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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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 * G.722 ADPCM audio decoder
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 *
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 * This G.722 decoder is a bit-exact implementation of the ITU G.722
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 * specification for all three specified bitrates - 64000bps, 56000bps
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 * and 48000bps. It passes the ITU tests.
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 *
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 * @note For the 56000bps and 48000bps bitrates, the lowest 1 or 2 bits
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 *       respectively of each byte are ignored.
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 */
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#include "libavutil/channel_layout.h"
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#include "libavutil/opt.h"
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#include "avcodec.h"
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#include "get_bits.h"
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#include "g722.h"
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#include "internal.h"
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#define OFFSET(x) offsetof(G722Context, x)
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#define AD AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM
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static const AVOption options[] = {
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    { "bits_per_codeword", "Bits per G722 codeword", OFFSET(bits_per_codeword), AV_OPT_TYPE_INT, { .i64 = 8 }, 6, 8, AD },
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    { NULL }
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};
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static const AVClass g722_decoder_class = {
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    .class_name = "g722 decoder",
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    .item_name  = av_default_item_name,
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    .option     = options,
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    .version    = LIBAVUTIL_VERSION_INT,
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};
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static av_cold int g722_decode_init(AVCodecContext * avctx)
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{
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    G722Context *c = avctx->priv_data;
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    avctx->channels       = 1;
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    avctx->channel_layout = AV_CH_LAYOUT_MONO;
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    avctx->sample_fmt     = AV_SAMPLE_FMT_S16;
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    c->band[0].scale_factor = 8;
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    c->band[1].scale_factor = 2;
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    c->prev_samples_pos = 22;
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    ff_g722dsp_init(&c->dsp);
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    return 0;
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}
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static const int16_t low_inv_quant5[32] = {
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     -35,   -35, -2919, -2195, -1765, -1458, -1219, -1023,
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    -858,  -714,  -587,  -473,  -370,  -276,  -190,  -110,
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    2919,  2195,  1765,  1458,  1219,  1023,   858,   714,
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     587,   473,   370,   276,   190,   110,    35,   -35
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};
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static const int16_t * const low_inv_quants[3] = { ff_g722_low_inv_quant6,
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                                                           low_inv_quant5,
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                                                   ff_g722_low_inv_quant4 };
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static int g722_decode_frame(AVCodecContext *avctx, void *data,
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                             int *got_frame_ptr, AVPacket *avpkt)
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{
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    G722Context *c = avctx->priv_data;
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    AVFrame *frame = data;
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    int16_t *out_buf;
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    int j, ret;
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    const int skip = 8 - c->bits_per_codeword;
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    const int16_t *quantizer_table = low_inv_quants[skip];
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    GetBitContext gb;
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    /* get output buffer */
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    frame->nb_samples = avpkt->size * 2;
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    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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        return ret;
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    out_buf = (int16_t *)frame->data[0];
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    ret = init_get_bits8(&gb, avpkt->data, avpkt->size);
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    if (ret < 0)
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        return ret;
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    for (j = 0; j < avpkt->size; j++) {
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        int ilow, ihigh, rlow, rhigh, dhigh;
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        int xout[2];
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        ihigh = get_bits(&gb, 2);
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        ilow = get_bits(&gb, 6 - skip);
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        skip_bits(&gb, skip);
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        rlow = av_clip_intp2((c->band[0].scale_factor * quantizer_table[ilow] >> 10)
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                      + c->band[0].s_predictor, 14);
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        ff_g722_update_low_predictor(&c->band[0], ilow >> (2 - skip));
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        dhigh = c->band[1].scale_factor * ff_g722_high_inv_quant[ihigh] >> 10;
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        rhigh = av_clip_intp2(dhigh + c->band[1].s_predictor, 14);
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        ff_g722_update_high_predictor(&c->band[1], dhigh, ihigh);
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        c->prev_samples[c->prev_samples_pos++] = rlow + rhigh;
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        c->prev_samples[c->prev_samples_pos++] = rlow - rhigh;
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        c->dsp.apply_qmf(c->prev_samples + c->prev_samples_pos - 24, xout);
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        *out_buf++ = av_clip_int16(xout[0] >> 11);
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        *out_buf++ = av_clip_int16(xout[1] >> 11);
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        if (c->prev_samples_pos >= PREV_SAMPLES_BUF_SIZE) {
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            memmove(c->prev_samples, c->prev_samples + c->prev_samples_pos - 22,
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                    22 * sizeof(c->prev_samples[0]));
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            c->prev_samples_pos = 22;
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        }
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    }
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    *got_frame_ptr = 1;
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    return avpkt->size;
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}
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AVCodec ff_adpcm_g722_decoder = {
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    .name           = "g722",
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    .long_name      = NULL_IF_CONFIG_SMALL("G.722 ADPCM"),
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    .type           = AVMEDIA_TYPE_AUDIO,
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    .id             = AV_CODEC_ID_ADPCM_G722,
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    .priv_data_size = sizeof(G722Context),
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    .init           = g722_decode_init,
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    .decode         = g722_decode_frame,
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    .capabilities   = AV_CODEC_CAP_DR1,
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    .priv_class     = &g722_decoder_class,
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};