FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/gsmdec.c
Date: 2022-07-06 18:02:43
Exec Total Coverage
Lines: 37 50 74.0%
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/channel_layout.h"
30 #include "avcodec.h"
31 #include "codec_internal.h"
32 #include "get_bits.h"
33 #include "internal.h"
34 #include "msgsmdec.h"
35
36 #include "gsmdec_template.c"
37
38 4 static av_cold int gsm_init(AVCodecContext *avctx)
39 {
40 4 av_channel_layout_uninit(&avctx->ch_layout);
41 4 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
42
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4 if (!avctx->sample_rate)
43 avctx->sample_rate = 8000;
44 4 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
45
46
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4 switch (avctx->codec_id) {
47 2 case AV_CODEC_ID_GSM:
48 2 avctx->frame_size = GSM_FRAME_SIZE;
49 2 avctx->block_align = GSM_BLOCK_SIZE;
50 2 break;
51 2 case AV_CODEC_ID_GSM_MS:
52 2 avctx->frame_size = 2 * GSM_FRAME_SIZE;
53
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2 if (!avctx->block_align)
54 avctx->block_align = GSM_MS_BLOCK_SIZE;
55 else
56
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2 if (avctx->block_align < MSN_MIN_BLOCK_SIZE ||
57
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2 avctx->block_align > GSM_MS_BLOCK_SIZE ||
58
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2 (avctx->block_align - MSN_MIN_BLOCK_SIZE) % 3) {
59 av_log(avctx, AV_LOG_ERROR, "Invalid block alignment %d\n",
60 avctx->block_align);
61 return AVERROR_INVALIDDATA;
62 }
63 }
64
65 4 return 0;
66 }
67
68 593 static int gsm_decode_frame(AVCodecContext *avctx, AVFrame *frame,
69 int *got_frame_ptr, AVPacket *avpkt)
70 {
71 int res;
72 GetBitContext gb;
73 593 const uint8_t *buf = avpkt->data;
74 593 int buf_size = avpkt->size;
75 int16_t *samples;
76
77
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593 if (buf_size < avctx->block_align) {
78 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
79 return AVERROR_INVALIDDATA;
80 }
81
82 /* get output buffer */
83 593 frame->nb_samples = avctx->frame_size;
84
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593 if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
85 return res;
86 593 samples = (int16_t *)frame->data[0];
87
88
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593 switch (avctx->codec_id) {
89 503 case AV_CODEC_ID_GSM:
90 503 init_get_bits(&gb, buf, buf_size * 8);
91
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503 if (get_bits(&gb, 4) != 0xd)
92 av_log(avctx, AV_LOG_WARNING, "Missing GSM magic!\n");
93 503 res = gsm_decode_block(avctx, samples, &gb, GSM_13000);
94
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503 if (res < 0)
95 return res;
96 503 break;
97 90 case AV_CODEC_ID_GSM_MS:
98 90 res = ff_msgsm_decode_block(avctx, samples, buf,
99 90 (GSM_MS_BLOCK_SIZE - avctx->block_align) / 3);
100
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90 if (res < 0)
101 return res;
102 }
103
104 593 *got_frame_ptr = 1;
105
106 593 return avctx->block_align;
107 }
108
109 static void gsm_flush(AVCodecContext *avctx)
110 {
111 GSMContext *s = avctx->priv_data;
112 memset(s, 0, sizeof(*s));
113 }
114
115 #if CONFIG_GSM_DECODER
116 const FFCodec ff_gsm_decoder = {
117 .p.name = "gsm",
118 .p.long_name = NULL_IF_CONFIG_SMALL("GSM"),
119 .p.type = AVMEDIA_TYPE_AUDIO,
120 .p.id = AV_CODEC_ID_GSM,
121 .priv_data_size = sizeof(GSMContext),
122 .init = gsm_init,
123 FF_CODEC_DECODE_CB(gsm_decode_frame),
124 .flush = gsm_flush,
125 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
126 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
127 };
128 #endif
129 #if CONFIG_GSM_MS_DECODER
130 const FFCodec ff_gsm_ms_decoder = {
131 .p.name = "gsm_ms",
132 .p.long_name = NULL_IF_CONFIG_SMALL("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 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
141 };
142 #endif
143