GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/cngenc.c Lines: 0 42 0.0 %
Date: 2019-11-18 18:00:01 Branches: 0 16 0.0 %

Line Branch Exec Source
1
/*
2
 * RFC 3389 comfort noise generator
3
 * Copyright (c) 2012 Martin Storsjo
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21
22
#include <math.h>
23
24
#include "libavutil/common.h"
25
#include "avcodec.h"
26
#include "internal.h"
27
#include "lpc.h"
28
29
typedef struct CNGContext {
30
    LPCContext lpc;
31
    int order;
32
    int32_t *samples32;
33
    double *ref_coef;
34
} CNGContext;
35
36
static av_cold int cng_encode_close(AVCodecContext *avctx)
37
{
38
    CNGContext *p = avctx->priv_data;
39
    ff_lpc_end(&p->lpc);
40
    av_free(p->samples32);
41
    av_free(p->ref_coef);
42
    return 0;
43
}
44
45
static av_cold int cng_encode_init(AVCodecContext *avctx)
46
{
47
    CNGContext *p = avctx->priv_data;
48
    int ret;
49
50
    if (avctx->channels != 1) {
51
        av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
52
        return AVERROR(EINVAL);
53
    }
54
55
    avctx->frame_size = 640;
56
    p->order = 10;
57
    if ((ret = ff_lpc_init(&p->lpc, avctx->frame_size, p->order, FF_LPC_TYPE_LEVINSON)) < 0)
58
        return ret;
59
    p->samples32 = av_malloc_array(avctx->frame_size, sizeof(*p->samples32));
60
    p->ref_coef = av_malloc_array(p->order, sizeof(*p->ref_coef));
61
    if (!p->samples32 || !p->ref_coef) {
62
        cng_encode_close(avctx);
63
        return AVERROR(ENOMEM);
64
    }
65
66
    return 0;
67
}
68
69
static int cng_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
70
                            const AVFrame *frame, int *got_packet_ptr)
71
{
72
    CNGContext *p = avctx->priv_data;
73
    int ret, i;
74
    double energy = 0;
75
    int qdbov;
76
    int16_t *samples = (int16_t*) frame->data[0];
77
78
    if ((ret = ff_alloc_packet2(avctx, avpkt, 1 + p->order, 1 + p->order))) {
79
        av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
80
        return ret;
81
    }
82
83
    for (i = 0; i < frame->nb_samples; i++) {
84
        p->samples32[i] = samples[i];
85
        energy += samples[i] * samples[i];
86
    }
87
    energy /= frame->nb_samples;
88
    if (energy > 0) {
89
        double dbov = 10 * log10(energy / 1081109975);
90
        qdbov = av_clip_uintp2(-floor(dbov), 7);
91
    } else {
92
        qdbov = 127;
93
    }
94
    ff_lpc_calc_ref_coefs(&p->lpc, p->samples32, p->order, p->ref_coef);
95
    avpkt->data[0] = qdbov;
96
    for (i = 0; i < p->order; i++)
97
        avpkt->data[1 + i] = p->ref_coef[i] * 127 + 127;
98
99
    *got_packet_ptr = 1;
100
    av_assert1(avpkt->size == 1 + p->order);
101
102
    return 0;
103
}
104
105
AVCodec ff_comfortnoise_encoder = {
106
    .name           = "comfortnoise",
107
    .long_name      = NULL_IF_CONFIG_SMALL("RFC 3389 comfort noise generator"),
108
    .type           = AVMEDIA_TYPE_AUDIO,
109
    .id             = AV_CODEC_ID_COMFORT_NOISE,
110
    .priv_data_size = sizeof(CNGContext),
111
    .init           = cng_encode_init,
112
    .encode2        = cng_encode_frame,
113
    .close          = cng_encode_close,
114
    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
115
                                                     AV_SAMPLE_FMT_NONE },
116
};