summaryrefslogtreecommitdiffstats
path: root/libavcodec/libopencore-amr.c
blob: 266164514f177b96bbb0e307d098d53e6352c7cc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
/*
 * AMR Audio decoder stub
 * Copyright (c) 2003 the ffmpeg project
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "avcodec.h"

static void amr_decode_fix_avctx(AVCodecContext *avctx)
{
    const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);

    if (!avctx->sample_rate)
        avctx->sample_rate = 8000 * is_amr_wb;

    if (!avctx->channels)
        avctx->channels = 1;

    avctx->frame_size = 160 * is_amr_wb;
    avctx->sample_fmt = SAMPLE_FMT_S16;
}

#if CONFIG_LIBOPENCORE_AMRNB

#include <opencore-amrnb/interf_dec.h>
#include <opencore-amrnb/interf_enc.h>

static const char nb_bitrate_unsupported[] =
    "bitrate not supported: use one of 4.75k, 5.15k, 5.9k, 6.7k, 7.4k, 7.95k, 10.2k or 12.2k\n";

/* Common code for fixed and float version*/
typedef struct AMR_bitrates {
    int       rate;
    enum Mode mode;
} AMR_bitrates;

/* Match desired bitrate */
static int getBitrateMode(int bitrate)
{
    /* make the correspondance between bitrate and mode */
    AMR_bitrates rates[] = { { 4750, MR475},
                             { 5150, MR515},
                             { 5900, MR59},
                             { 6700, MR67},
                             { 7400, MR74},
                             { 7950, MR795},
                             {10200, MR102},
                             {12200, MR122}, };
    int i;

    for (i = 0; i < 8; i++)
        if (rates[i].rate == bitrate)
            return rates[i].mode;
    /* no bitrate matching, return an error */
    return -1;
}

typedef struct AMRContext {
    int   frameCount;
    void *decState;
    int  *enstate;
    int   enc_bitrate;
} AMRContext;

static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
{
    AMRContext *s = avctx->priv_data;

    s->frameCount = 0;
    s->decState   = Decoder_Interface_init();
    if (!s->decState) {
        av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\r\n");
        return -1;
    }

    amr_decode_fix_avctx(avctx);

    if (avctx->channels > 1) {
        av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
        return -1;
    }

    return 0;
}

static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
{
    AMRContext *s = avctx->priv_data;

    Decoder_Interface_exit(s->decState);
    return 0;
}

static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
                               int *data_size, AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size       = avpkt->size;
    AMRContext *s = avctx->priv_data;
    const uint8_t *amrData = buf;
    static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
    enum Mode dec_mode;
    int packet_size;

    /* av_log(NULL, AV_LOG_DEBUG, "amr_decode_frame buf=%p buf_size=%d frameCount=%d!!\n",
              buf, buf_size, s->frameCount); */

    dec_mode = (buf[0] >> 3) & 0x000F;
    packet_size = block_size[dec_mode] + 1;

    if (packet_size > buf_size) {
        av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
               buf_size, packet_size);
        return -1;
    }

    s->frameCount++;
    /* av_log(NULL, AV_LOG_DEBUG, "packet_size=%d amrData= 0x%X %X %X %X\n",
              packet_size, amrData[0], amrData[1], amrData[2], amrData[3]); */
    /* call decoder */
    Decoder_Interface_Decode(s->decState, amrData, data, 0);
    *data_size = 160 * 2;

    return packet_size;
}

AVCodec libopencore_amrnb_decoder = {
    "libopencore_amrnb",
    AVMEDIA_TYPE_AUDIO,
    CODEC_ID_AMR_NB,
    sizeof(AMRContext),
    amr_nb_decode_init,
    NULL,
    amr_nb_decode_close,
    amr_nb_decode_frame,
    .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
};

static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
{
    AMRContext *s = avctx->priv_data;

    s->frameCount = 0;

    if (avctx->sample_rate != 8000) {
        av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
        return -1;
    }

    if (avctx->channels != 1) {
        av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
        return -1;
    }

    avctx->frame_size  = 160;
    avctx->coded_frame = avcodec_alloc_frame();

    s->enstate=Encoder_Interface_init(0);
    if (!s->enstate) {
        av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
        return -1;
    }

    if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
        av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
        return -1;
    }

    return 0;
}

static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
{
    AMRContext *s = avctx->priv_data;

    Encoder_Interface_exit(s->enstate);
    av_freep(&avctx->coded_frame);
    return 0;
}

static int amr_nb_encode_frame(AVCodecContext *avctx,
                               unsigned char *frame/*out*/,
                               int buf_size, void *data/*in*/)
{
    AMRContext *s = avctx->priv_data;
    int written;

    if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
        av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
        return -1;
    }

    written = Encoder_Interface_Encode(s->enstate, s->enc_bitrate, data,
                                       frame, 0);
    /* av_log(NULL, AV_LOG_DEBUG, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
              written, s->enc_bitrate, frame[0] ); */

    return written;
}

AVCodec libopencore_amrnb_encoder = {
    "libopencore_amrnb",
    AVMEDIA_TYPE_AUDIO,
    CODEC_ID_AMR_NB,
    sizeof(AMRContext),
    amr_nb_encode_init,
    amr_nb_encode_frame,
    amr_nb_encode_close,
    NULL,
    .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
    .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
};

#endif

/* -----------AMR wideband ------------*/
#if CONFIG_LIBOPENCORE_AMRWB

#ifdef _TYPEDEF_H
//To avoid duplicate typedefs from typedef in amr-nb
#define typedef_h
#endif

#include <opencore-amrwb/dec_if.h>
#include <opencore-amrwb/if_rom.h>

static const char wb_bitrate_unsupported[] =
    "bitrate not supported: use one of 6.6k, 8.85k, 12.65k, 14.25k, 15.85k, 18.25k, 19.85k, 23.05k, or 23.85k\n";

/* Common code for fixed and float version*/
typedef struct AMRWB_bitrates {
    int rate;
    int mode;
} AMRWB_bitrates;

typedef struct AMRWBContext {
    int    frameCount;
    void  *state;
    int    mode;
    Word16 allow_dtx;
} AMRWBContext;

static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
{
    AMRWBContext *s = avctx->priv_data;

    s->frameCount = 0;
    s->state      = D_IF_init();

    amr_decode_fix_avctx(avctx);

    if (avctx->channels > 1) {
        av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
        return -1;
    }

    return 0;
}

static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
                               int *data_size, AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size       = avpkt->size;
    AMRWBContext *s = avctx->priv_data;
    const uint8_t *amrData = buf;
    int mode;
    int packet_size;
    static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};

    if (!buf_size)
        /* nothing to do */
        return 0;

    mode = (amrData[0] >> 3) & 0x000F;
    packet_size = block_size[mode];

    if (packet_size > buf_size) {
        av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
               buf_size, packet_size + 1);
        return -1;
    }

    s->frameCount++;
    D_IF_decode(s->state, amrData, data, _good_frame);
    *data_size = 320 * 2;
    return packet_size;
}

static int amr_wb_decode_close(AVCodecContext *avctx)
{
    AMRWBContext *s = avctx->priv_data;

    D_IF_exit(s->state);
    return 0;
}

AVCodec libopencore_amrwb_decoder = {
    "libopencore_amrwb",
    AVMEDIA_TYPE_AUDIO,
    CODEC_ID_AMR_WB,
    sizeof(AMRWBContext),
    amr_wb_decode_init,
    NULL,
    amr_wb_decode_close,
    amr_wb_decode_frame,
    .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Wide-Band"),
};

#endif /* CONFIG_LIBOPENCORE_AMRWB */
OpenPOWER on IntegriCloud