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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 |
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4 | if (!avctx->sample_rate) |
44 | ✗ | avctx->sample_rate = 8000; | |
45 | 4 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; | |
46 | |||
47 |
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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 |
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2 | if (!avctx->block_align) |
55 | ✗ | avctx->block_align = GSM_MS_BLOCK_SIZE; | |
56 | else | ||
57 |
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2 | if (avctx->block_align < MSN_MIN_BLOCK_SIZE || |
58 |
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2 | avctx->block_align > GSM_MS_BLOCK_SIZE || |
59 |
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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 | 596 | static int gsm_decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
70 | int *got_frame_ptr, AVPacket *avpkt) | ||
71 | { | ||
72 | int res; | ||
73 | GetBitContext gb; | ||
74 | 596 | const uint8_t *buf = avpkt->data; | |
75 | 596 | int buf_size = avpkt->size; | |
76 | int16_t *samples; | ||
77 | |||
78 |
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596 | 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 | 596 | frame->nb_samples = avctx->frame_size; | |
85 |
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596 | if ((res = ff_get_buffer(avctx, frame, 0)) < 0) |
86 | ✗ | return res; | |
87 | 596 | samples = (int16_t *)frame->data[0]; | |
88 | |||
89 |
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596 | switch (avctx->codec_id) { |
90 | 506 | case AV_CODEC_ID_GSM: | |
91 | 506 | init_get_bits(&gb, buf, buf_size * 8); | |
92 |
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506 | if (get_bits(&gb, 4) != 0xd) |
93 | ✗ | av_log(avctx, AV_LOG_WARNING, "Missing GSM magic!\n"); | |
94 | 506 | res = gsm_decode_block(avctx, samples, &gb, GSM_13000); | |
95 |
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506 | if (res < 0) |
96 | ✗ | return res; | |
97 | 506 | 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 |
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90 | if (res < 0) |
102 | ✗ | return res; | |
103 | } | ||
104 | |||
105 | 596 | *got_frame_ptr = 1; | |
106 | |||
107 | 596 | 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 |