2 * AMR Audio decoder stub
3 * Copyright (c) 2003 the ffmpeg project
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "libavutil/avstring.h"
24 #include "libavutil/opt.h"
26 static void amr_decode_fix_avctx(AVCodecContext
*avctx
)
28 const int is_amr_wb
= 1 + (avctx
->codec_id
== CODEC_ID_AMR_WB
);
30 if (!avctx
->sample_rate
)
31 avctx
->sample_rate
= 8000 * is_amr_wb
;
36 avctx
->frame_size
= 160 * is_amr_wb
;
37 avctx
->sample_fmt
= AV_SAMPLE_FMT_S16
;
40 #if CONFIG_LIBOPENCORE_AMRNB
42 #include <opencore-amrnb/interf_dec.h>
43 #include <opencore-amrnb/interf_enc.h>
45 /* Common code for fixed and float version*/
46 typedef struct AMR_bitrates
{
51 /* Match desired bitrate */
52 static int get_bitrate_mode(int bitrate
, void *log_ctx
)
54 /* make the correspondance between bitrate and mode */
55 static const AMR_bitrates rates
[] = {
56 { 4750, MR475
}, { 5150, MR515
}, { 5900, MR59
}, { 6700, MR67
},
57 { 7400, MR74
}, { 7950, MR795
}, { 10200, MR102
}, { 12200, MR122
}
59 int i
, best
= -1, min_diff
= 0;
62 for (i
= 0; i
< 8; i
++) {
63 if (rates
[i
].rate
== bitrate
)
65 if (best
< 0 || abs(rates
[i
].rate
- bitrate
) < min_diff
) {
67 min_diff
= abs(rates
[i
].rate
- bitrate
);
70 /* no bitrate matching exactly, log a warning */
71 snprintf(log_buf
, sizeof(log_buf
), "bitrate not supported: use one of ");
72 for (i
= 0; i
< 8; i
++)
73 av_strlcatf(log_buf
, sizeof(log_buf
), "%.2fk, ", rates
[i
].rate
/ 1000.f
);
74 av_strlcatf(log_buf
, sizeof(log_buf
), "using %.2fk", rates
[best
].rate
/ 1000.f
);
75 av_log(log_ctx
, AV_LOG_WARNING
, "%s\n", log_buf
);
80 typedef struct AMRContext
{
90 static const AVOption options
[] = {
91 { "dtx", "Allow DTX (generate comfort noise)", offsetof(AMRContext
, enc_dtx
), FF_OPT_TYPE_INT
, { 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM
| AV_OPT_FLAG_ENCODING_PARAM
},
95 static const AVClass
class = {
96 "libopencore_amrnb", av_default_item_name
, options
, LIBAVUTIL_VERSION_INT
99 static av_cold
int amr_nb_decode_init(AVCodecContext
*avctx
)
101 AMRContext
*s
= avctx
->priv_data
;
104 s
->dec_state
= Decoder_Interface_init();
106 av_log(avctx
, AV_LOG_ERROR
, "Decoder_Interface_init error\n");
110 amr_decode_fix_avctx(avctx
);
112 if (avctx
->channels
> 1) {
113 av_log(avctx
, AV_LOG_ERROR
, "amr_nb: multichannel decoding not supported\n");
114 return AVERROR(ENOSYS
);
120 static av_cold
int amr_nb_decode_close(AVCodecContext
*avctx
)
122 AMRContext
*s
= avctx
->priv_data
;
124 Decoder_Interface_exit(s
->dec_state
);
128 static int amr_nb_decode_frame(AVCodecContext
*avctx
, void *data
,
129 int *data_size
, AVPacket
*avpkt
)
131 const uint8_t *buf
= avpkt
->data
;
132 int buf_size
= avpkt
->size
;
133 AMRContext
*s
= avctx
->priv_data
;
134 static const uint8_t block_size
[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
138 av_dlog(avctx
, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
139 buf
, buf_size
, s
->frame_count
);
141 dec_mode
= (buf
[0] >> 3) & 0x000F;
142 packet_size
= block_size
[dec_mode
] + 1;
144 if (packet_size
> buf_size
) {
145 av_log(avctx
, AV_LOG_ERROR
, "amr frame too short (%u, should be %u)\n",
146 buf_size
, packet_size
);
147 return AVERROR_INVALIDDATA
;
151 av_dlog(avctx
, "packet_size=%d buf= 0x%X %X %X %X\n",
152 packet_size
, buf
[0], buf
[1], buf
[2], buf
[3]);
154 Decoder_Interface_Decode(s
->dec_state
, buf
, data
, 0);
155 *data_size
= 160 * 2;
160 AVCodec ff_libopencore_amrnb_decoder
= {
161 .name
= "libopencore_amrnb",
162 .type
= AVMEDIA_TYPE_AUDIO
,
163 .id
= CODEC_ID_AMR_NB
,
164 .priv_data_size
= sizeof(AMRContext
),
165 .init
= amr_nb_decode_init
,
166 .close
= amr_nb_decode_close
,
167 .decode
= amr_nb_decode_frame
,
168 .long_name
= NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
171 static av_cold
int amr_nb_encode_init(AVCodecContext
*avctx
)
173 AMRContext
*s
= avctx
->priv_data
;
177 if (avctx
->sample_rate
!= 8000) {
178 av_log(avctx
, AV_LOG_ERROR
, "Only 8000Hz sample rate supported\n");
179 return AVERROR(ENOSYS
);
182 if (avctx
->channels
!= 1) {
183 av_log(avctx
, AV_LOG_ERROR
, "Only mono supported\n");
184 return AVERROR(ENOSYS
);
187 avctx
->frame_size
= 160;
188 avctx
->coded_frame
= avcodec_alloc_frame();
190 s
->enc_state
= Encoder_Interface_init(s
->enc_dtx
);
192 av_log(avctx
, AV_LOG_ERROR
, "Encoder_Interface_init error\n");
196 s
->enc_mode
= get_bitrate_mode(avctx
->bit_rate
, avctx
);
197 s
->enc_bitrate
= avctx
->bit_rate
;
202 static av_cold
int amr_nb_encode_close(AVCodecContext
*avctx
)
204 AMRContext
*s
= avctx
->priv_data
;
206 Encoder_Interface_exit(s
->enc_state
);
207 av_freep(&avctx
->coded_frame
);
211 static int amr_nb_encode_frame(AVCodecContext
*avctx
,
212 unsigned char *frame
/*out*/,
213 int buf_size
, void *data
/*in*/)
215 AMRContext
*s
= avctx
->priv_data
;
218 if (s
->enc_bitrate
!= avctx
->bit_rate
) {
219 s
->enc_mode
= get_bitrate_mode(avctx
->bit_rate
, avctx
);
220 s
->enc_bitrate
= avctx
->bit_rate
;
223 written
= Encoder_Interface_Encode(s
->enc_state
, s
->enc_mode
, data
,
225 av_dlog(avctx
, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
226 written
, s
->enc_mode
, frame
[0]);
231 AVCodec ff_libopencore_amrnb_encoder
= {
232 .name
= "libopencore_amrnb",
233 .type
= AVMEDIA_TYPE_AUDIO
,
234 .id
= CODEC_ID_AMR_NB
,
235 .priv_data_size
= sizeof(AMRContext
),
236 .init
= amr_nb_encode_init
,
237 .encode
= amr_nb_encode_frame
,
238 .close
= amr_nb_encode_close
,
239 .sample_fmts
= (const enum AVSampleFormat
[]){AV_SAMPLE_FMT_S16
,AV_SAMPLE_FMT_NONE
},
240 .long_name
= NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
241 .priv_class
= &class,
246 /* -----------AMR wideband ------------*/
247 #if CONFIG_LIBOPENCORE_AMRWB
249 #include <opencore-amrwb/dec_if.h>
250 #include <opencore-amrwb/if_rom.h>
252 typedef struct AMRWBContext
{
256 static av_cold
int amr_wb_decode_init(AVCodecContext
*avctx
)
258 AMRWBContext
*s
= avctx
->priv_data
;
260 s
->state
= D_IF_init();
262 amr_decode_fix_avctx(avctx
);
264 if (avctx
->channels
> 1) {
265 av_log(avctx
, AV_LOG_ERROR
, "amr_wb: multichannel decoding not supported\n");
266 return AVERROR(ENOSYS
);
272 static int amr_wb_decode_frame(AVCodecContext
*avctx
, void *data
,
273 int *data_size
, AVPacket
*avpkt
)
275 const uint8_t *buf
= avpkt
->data
;
276 int buf_size
= avpkt
->size
;
277 AMRWBContext
*s
= avctx
->priv_data
;
280 static const uint8_t block_size
[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
286 mode
= (buf
[0] >> 3) & 0x000F;
287 packet_size
= block_size
[mode
];
289 if (packet_size
> buf_size
) {
290 av_log(avctx
, AV_LOG_ERROR
, "amr frame too short (%u, should be %u)\n",
291 buf_size
, packet_size
+ 1);
292 return AVERROR_INVALIDDATA
;
295 D_IF_decode(s
->state
, buf
, data
, _good_frame
);
296 *data_size
= 320 * 2;
300 static int amr_wb_decode_close(AVCodecContext
*avctx
)
302 AMRWBContext
*s
= avctx
->priv_data
;
308 AVCodec ff_libopencore_amrwb_decoder
= {
309 .name
= "libopencore_amrwb",
310 .type
= AVMEDIA_TYPE_AUDIO
,
311 .id
= CODEC_ID_AMR_WB
,
312 .priv_data_size
= sizeof(AMRWBContext
),
313 .init
= amr_wb_decode_init
,
314 .close
= amr_wb_decode_close
,
315 .decode
= amr_wb_decode_frame
,
316 .long_name
= NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Wide-Band"),
319 #endif /* CONFIG_LIBOPENCORE_AMRWB */