lavc: use designated initialisers for all codecs.
[libav.git] / libavcodec / libgsm.c
1 /*
2 * Interface to libgsm for gsm encoding/decoding
3 * Copyright (c) 2005 Alban Bedel <albeu@free.fr>
4 * Copyright (c) 2006, 2007 Michel Bardiaux <mbardiaux@mediaxim.be>
5 *
6 * This file is part of Libav.
7 *
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * Libav is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * Interface to libgsm for gsm encoding/decoding
26 */
27
28 // The idiosyncrasies of GSM-in-WAV are explained at http://kbs.cs.tu-berlin.de/~jutta/toast.html
29
30 #include "avcodec.h"
31 #include <gsm/gsm.h>
32
33 // gsm.h misses some essential constants
34 #define GSM_BLOCK_SIZE 33
35 #define GSM_MS_BLOCK_SIZE 65
36 #define GSM_FRAME_SIZE 160
37
38 static av_cold int libgsm_init(AVCodecContext *avctx) {
39 if (avctx->channels > 1) {
40 av_log(avctx, AV_LOG_ERROR, "Mono required for GSM, got %d channels\n",
41 avctx->channels);
42 return -1;
43 }
44
45 if(avctx->codec->decode){
46 if(!avctx->channels)
47 avctx->channels= 1;
48
49 if(!avctx->sample_rate)
50 avctx->sample_rate= 8000;
51
52 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
53 }else{
54 if (avctx->sample_rate != 8000) {
55 av_log(avctx, AV_LOG_ERROR, "Sample rate 8000Hz required for GSM, got %dHz\n",
56 avctx->sample_rate);
57 if(avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL)
58 return -1;
59 }
60 if (avctx->bit_rate != 13000 /* Official */ &&
61 avctx->bit_rate != 13200 /* Very common */ &&
62 avctx->bit_rate != 0 /* Unknown; a.o. mov does not set bitrate when decoding */ ) {
63 av_log(avctx, AV_LOG_ERROR, "Bitrate 13000bps required for GSM, got %dbps\n",
64 avctx->bit_rate);
65 if(avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL)
66 return -1;
67 }
68 }
69
70 avctx->priv_data = gsm_create();
71
72 switch(avctx->codec_id) {
73 case CODEC_ID_GSM:
74 avctx->frame_size = GSM_FRAME_SIZE;
75 avctx->block_align = GSM_BLOCK_SIZE;
76 break;
77 case CODEC_ID_GSM_MS: {
78 int one = 1;
79 gsm_option(avctx->priv_data, GSM_OPT_WAV49, &one);
80 avctx->frame_size = 2*GSM_FRAME_SIZE;
81 avctx->block_align = GSM_MS_BLOCK_SIZE;
82 }
83 }
84
85 avctx->coded_frame= avcodec_alloc_frame();
86 avctx->coded_frame->key_frame= 1;
87
88 return 0;
89 }
90
91 static av_cold int libgsm_close(AVCodecContext *avctx) {
92 av_freep(&avctx->coded_frame);
93 gsm_destroy(avctx->priv_data);
94 avctx->priv_data = NULL;
95 return 0;
96 }
97
98 static int libgsm_encode_frame(AVCodecContext *avctx,
99 unsigned char *frame, int buf_size, void *data) {
100 // we need a full block
101 if(buf_size < avctx->block_align) return 0;
102
103 switch(avctx->codec_id) {
104 case CODEC_ID_GSM:
105 gsm_encode(avctx->priv_data,data,frame);
106 break;
107 case CODEC_ID_GSM_MS:
108 gsm_encode(avctx->priv_data,data,frame);
109 gsm_encode(avctx->priv_data,((short*)data)+GSM_FRAME_SIZE,frame+32);
110 }
111 return avctx->block_align;
112 }
113
114
115 AVCodec ff_libgsm_encoder = {
116 .name = "libgsm",
117 .type = AVMEDIA_TYPE_AUDIO,
118 .id = CODEC_ID_GSM,
119 .init = libgsm_init,
120 .encode = libgsm_encode_frame,
121 .close = libgsm_close,
122 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
123 .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"),
124 };
125
126 AVCodec ff_libgsm_ms_encoder = {
127 .name = "libgsm_ms",
128 .type = AVMEDIA_TYPE_AUDIO,
129 .id = CODEC_ID_GSM_MS,
130 .init = libgsm_init,
131 .encode = libgsm_encode_frame,
132 .close = libgsm_close,
133 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
134 .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM Microsoft variant"),
135 };
136
137 static int libgsm_decode_frame(AVCodecContext *avctx,
138 void *data, int *data_size,
139 AVPacket *avpkt) {
140 uint8_t *buf = avpkt->data;
141 int buf_size = avpkt->size;
142 *data_size = 0; /* In case of error */
143 if(buf_size < avctx->block_align) return -1;
144 switch(avctx->codec_id) {
145 case CODEC_ID_GSM:
146 if(gsm_decode(avctx->priv_data,buf,data)) return -1;
147 *data_size = GSM_FRAME_SIZE*sizeof(int16_t);
148 break;
149 case CODEC_ID_GSM_MS:
150 if(gsm_decode(avctx->priv_data,buf,data) ||
151 gsm_decode(avctx->priv_data,buf+33,((int16_t*)data)+GSM_FRAME_SIZE)) return -1;
152 *data_size = GSM_FRAME_SIZE*sizeof(int16_t)*2;
153 }
154 return avctx->block_align;
155 }
156
157 AVCodec ff_libgsm_decoder = {
158 .name = "libgsm",
159 .type = AVMEDIA_TYPE_AUDIO,
160 .id = CODEC_ID_GSM,
161 .init = libgsm_init,
162 .close = libgsm_close,
163 .decode = libgsm_decode_frame,
164 .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"),
165 };
166
167 AVCodec ff_libgsm_ms_decoder = {
168 .name = "libgsm_ms",
169 .type = AVMEDIA_TYPE_AUDIO,
170 .id = CODEC_ID_GSM_MS,
171 .init = libgsm_init,
172 .close = libgsm_close,
173 .decode = libgsm_decode_frame,
174 .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM Microsoft variant"),
175 };