aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/libopencore-amr.c
blob: aa6dfa62ec4ac08e96bfad6c3ff77633c3fe6e97 (plain) (blame)
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
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
/*
 * 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"
#include "libavutil/avstring.h"
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "audio_frame_queue.h"
#include "internal.h"

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

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

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

    avctx->sample_fmt = AV_SAMPLE_FMT_S16;
}

#if CONFIG_LIBOPENCORE_AMRNB

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

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

/* Match desired bitrate */
static int get_bitrate_mode(int bitrate, void *log_ctx)
{
    /* make the correspondance between bitrate and mode */
    static const AMR_bitrates rates[] = {
        { 4750, MR475 }, { 5150, MR515 }, {  5900, MR59  }, {  6700, MR67  },
        { 7400, MR74 },  { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
    };
    int i, best = -1, min_diff = 0;
    char log_buf[200];

    for (i = 0; i < 8; i++) {
        if (rates[i].rate == bitrate)
            return rates[i].mode;
        if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
            best     = i;
            min_diff = abs(rates[i].rate - bitrate);
        }
    }
    /* no bitrate matching exactly, log a warning */
    snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
    for (i = 0; i < 8; i++)
        av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate    / 1000.f);
    av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
    av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);

    return best;
}

typedef struct AMRContext {
    AVClass *av_class;
    AVFrame frame;
    void *dec_state;
    void *enc_state;
    int   enc_bitrate;
    int   enc_mode;
    int   enc_dtx;
    int   enc_last_frame;
    AudioFrameQueue afq;
} AMRContext;

static const AVOption options[] = {
    { "dtx", "Allow DTX (generate comfort noise)", offsetof(AMRContext, enc_dtx), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
    { NULL }
};

static const AVClass class = {
    "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT
};

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

    s->dec_state   = Decoder_Interface_init();
    if (!s->dec_state) {
        av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\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 AVERROR(ENOSYS);
    }

    avcodec_get_frame_defaults(&s->frame);
    avctx->coded_frame = &s->frame;

    return 0;
}

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

    Decoder_Interface_exit(s->dec_state);

    return 0;
}

static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
                               int *got_frame_ptr, AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size       = avpkt->size;
    AMRContext *s      = avctx->priv_data;
    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, ret;

    av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
            buf, buf_size, avctx->frame_number);

    /* get output buffer */
    s->frame.nb_samples = 160;
    if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
        return ret;
    }

    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 AVERROR_INVALIDDATA;
    }

    av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n",
              packet_size, buf[0], buf[1], buf[2], buf[3]);
    /* call decoder */
    Decoder_Interface_Decode(s->dec_state, buf, (short *)s->frame.data[0], 0);

    *got_frame_ptr   = 1;
    *(AVFrame *)data = s->frame;

    return packet_size;
}

AVCodec ff_libopencore_amrnb_decoder = {
    .name           = "libopencore_amrnb",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_AMR_NB,
    .priv_data_size = sizeof(AMRContext),
    .init           = amr_nb_decode_init,
    .close          = amr_nb_decode_close,
    .decode         = amr_nb_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
};

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

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

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

    avctx->frame_size  = 160;
    avctx->delay       =  50;
    ff_af_queue_init(avctx, &s->afq);
#if FF_API_OLD_ENCODE_AUDIO
    avctx->coded_frame = avcodec_alloc_frame();
    if (!avctx->coded_frame)
        return AVERROR(ENOMEM);
#endif

    s->enc_state = Encoder_Interface_init(s->enc_dtx);
    if (!s->enc_state) {
        av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
        av_freep(&avctx->coded_frame);
        return -1;
    }

    s->enc_mode    = get_bitrate_mode(avctx->bit_rate, avctx);
    s->enc_bitrate = avctx->bit_rate;

    return 0;
}

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

    Encoder_Interface_exit(s->enc_state);
    ff_af_queue_close(&s->afq);
#if FF_API_OLD_ENCODE_AUDIO
    av_freep(&avctx->coded_frame);
#endif
    return 0;
}

static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
                               const AVFrame *frame, int *got_packet_ptr)
{
    AMRContext *s = avctx->priv_data;
    int written, ret;
    int16_t *flush_buf = NULL;
    const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;

    if (s->enc_bitrate != avctx->bit_rate) {
        s->enc_mode    = get_bitrate_mode(avctx->bit_rate, avctx);
        s->enc_bitrate = avctx->bit_rate;
    }

    if ((ret = ff_alloc_packet2(avctx, avpkt, 32)))
        return ret;

    if (frame) {
        if (frame->nb_samples < avctx->frame_size) {
            flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
            if (!flush_buf)
                return AVERROR(ENOMEM);
            memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf));
            samples = flush_buf;
            if (frame->nb_samples < avctx->frame_size - avctx->delay)
                s->enc_last_frame = -1;
        }
        if ((ret = ff_af_queue_add(&s->afq, frame) < 0)) {
            av_freep(&flush_buf);
            return ret;
        }
    } else {
        if (s->enc_last_frame < 0)
            return 0;
        flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
        if (!flush_buf)
            return AVERROR(ENOMEM);
        samples = flush_buf;
        s->enc_last_frame = -1;
    }

    written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
                                       avpkt->data, 0);
    av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
            written, s->enc_mode, frame[0]);

    /* Get the next frame pts/duration */
    ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
                       &avpkt->duration);

    avpkt->size = written;
    *got_packet_ptr = 1;
    av_freep(&flush_buf);
    return 0;
}

AVCodec ff_libopencore_amrnb_encoder = {
    .name           = "libopencore_amrnb",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_AMR_NB,
    .priv_data_size = sizeof(AMRContext),
    .init           = amr_nb_encode_init,
    .encode2        = amr_nb_encode_frame,
    .close          = amr_nb_encode_close,
    .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_SMALL_LAST_FRAME,
    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
                                                     AV_SAMPLE_FMT_NONE },
    .long_name      = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
    .priv_class     = &class,
};

#endif

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

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

typedef struct AMRWBContext {
    AVFrame frame;
    void  *state;
} AMRWBContext;

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

    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 AVERROR(ENOSYS);
    }

    avcodec_get_frame_defaults(&s->frame);
    avctx->coded_frame = &s->frame;

    return 0;
}

static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
                               int *got_frame_ptr, AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size       = avpkt->size;
    AMRWBContext *s    = avctx->priv_data;
    int mode, ret;
    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};

    /* get output buffer */
    s->frame.nb_samples = 320;
    if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
        return ret;
    }

    mode        = (buf[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 AVERROR_INVALIDDATA;
    }

    D_IF_decode(s->state, buf, (short *)s->frame.data[0], _good_frame);

    *got_frame_ptr   = 1;
    *(AVFrame *)data = s->frame;

    return packet_size;
}

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

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

AVCodec ff_libopencore_amrwb_decoder = {
    .name           = "libopencore_amrwb",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_AMR_WB,
    .priv_data_size = sizeof(AMRWBContext),
    .init           = amr_wb_decode_init,
    .close          = amr_wb_decode_close,
    .decode         = amr_wb_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("OpenCORE AMR-WB (Adaptive Multi-Rate Wide-Band)"),
};

#endif /* CONFIG_LIBOPENCORE_AMRWB */