FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/gsmdec.c
Date: 2026-01-16 07:34:38
Exec Total Coverage
Lines: 37 51 72.5%
Functions: 2 3 66.7%
Branches: 14 26 53.8%
Line Branch Exec Source
1 /*
2 * gsm 06.10 decoder
3 * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
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 /**
23 * @file
24 * GSM decoder
25 */
26
27 #include "config_components.h"
28
29 #include "libavutil/attributes.h"
30 #include "libavutil/channel_layout.h"
31 #include "avcodec.h"
32 #include "codec_internal.h"
33 #include "decode.h"
34 #include "get_bits.h"
35 #include "msgsmdec.h"
36
37 #include "gsmdec_template.c"
38
39 4 static av_cold int gsm_init(AVCodecContext *avctx)
40 {
41 4 av_channel_layout_uninit(&avctx->ch_layout);
42 4 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
43
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 4 times.
 4 if (!avctx->sample_rate)
44 ✗ avctx->sample_rate = 8000;
45 4 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
46
47
2/3
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 2 times.
✗ Branch 2 not taken.
 4 switch (avctx->codec_id) {
48 2 case AV_CODEC_ID_GSM:
49 2 avctx->frame_size = GSM_FRAME_SIZE;
50 2 avctx->block_align = GSM_BLOCK_SIZE;
51 2 break;
52 2 case AV_CODEC_ID_GSM_MS:
53 2 avctx->frame_size = 2 * GSM_FRAME_SIZE;
54
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
 2 if (!avctx->block_align)
55 ✗ avctx->block_align = GSM_MS_BLOCK_SIZE;
56 else
57
1/2
✓ Branch 0 taken 2 times.
✗ Branch 1 not taken.
 2 if (avctx->block_align < MSN_MIN_BLOCK_SIZE ||
58
1/2
✓ Branch 0 taken 2 times.
✗ Branch 1 not taken.
 2 avctx->block_align > GSM_MS_BLOCK_SIZE ||
59
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
 2 (avctx->block_align - MSN_MIN_BLOCK_SIZE) % 3) {
60 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid block alignment %d\n",
61 avctx->block_align);
62 ✗ return AVERROR_INVALIDDATA;
63 }
64 }
65
66 4 return 0;
67 }
68
69 594 static int gsm_decode_frame(AVCodecContext *avctx, AVFrame *frame,
70 int *got_frame_ptr, AVPacket *avpkt)
71 {
72 int res;
73 GetBitContext gb;
74 594 const uint8_t *buf = avpkt->data;
75 594 int buf_size = avpkt->size;
76 int16_t *samples;
77
78
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 594 times.
 594 if (buf_size < avctx->block_align) {
79 ✗ av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
80 ✗ return AVERROR_INVALIDDATA;
81 }
82
83 /* get output buffer */
84 594 frame->nb_samples = avctx->frame_size;
85
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 594 times.
 594 if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
86 ✗ return res;
87 594 samples = (int16_t *)frame->data[0];
88
89
2/3
✓ Branch 0 taken 504 times.
✓ Branch 1 taken 90 times.
✗ Branch 2 not taken.
 594 switch (avctx->codec_id) {
90 504 case AV_CODEC_ID_GSM:
91 504 init_get_bits(&gb, buf, buf_size * 8);
92
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 504 times.
 504 if (get_bits(&gb, 4) != 0xd)
93 ✗ av_log(avctx, AV_LOG_WARNING, "Missing GSM magic!\n");
94 504 res = gsm_decode_block(avctx, samples, &gb, GSM_13000);
95
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 504 times.
 504 if (res < 0)
96 ✗ return res;
97 504 break;
98 90 case AV_CODEC_ID_GSM_MS:
99 90 res = ff_msgsm_decode_block(avctx, samples, buf,
100 90 (GSM_MS_BLOCK_SIZE - avctx->block_align) / 3);
101
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 90 times.
 90 if (res < 0)
102 ✗ return res;
103 }
104
105 594 *got_frame_ptr = 1;
106
107 594 return avctx->block_align;
108 }
109
110 ✗ static av_cold void gsm_flush(AVCodecContext *avctx)
111 {
112 ✗ GSMContext *s = avctx->priv_data;
113 ✗ memset(s, 0, sizeof(*s));
114 ✗ }
115
116 #if CONFIG_GSM_DECODER
117 const FFCodec ff_gsm_decoder = {
118 .p.name = "gsm",
119 CODEC_LONG_NAME("GSM"),
120 .p.type = AVMEDIA_TYPE_AUDIO,
121 .p.id = AV_CODEC_ID_GSM,
122 .priv_data_size = sizeof(GSMContext),
123 .init = gsm_init,
124 FF_CODEC_DECODE_CB(gsm_decode_frame),
125 .flush = gsm_flush,
126 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
127 };
128 #endif
129 #if CONFIG_GSM_MS_DECODER
130 const FFCodec ff_gsm_ms_decoder = {
131 .p.name = "gsm_ms",
132 CODEC_LONG_NAME("GSM Microsoft variant"),
133 .p.type = AVMEDIA_TYPE_AUDIO,
134 .p.id = AV_CODEC_ID_GSM_MS,
135 .priv_data_size = sizeof(GSMContext),
136 .init = gsm_init,
137 FF_CODEC_DECODE_CB(gsm_decode_frame),
138 .flush = gsm_flush,
139 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
140 };
141 #endif
142