1/*
2 * AMR Audio decoder stub
3 * Copyright (c) 2003 the ffmpeg project
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#include "avcodec.h"
23
24static void amr_decode_fix_avctx(AVCodecContext *avctx)
25{
26    const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);
27
28    if (!avctx->sample_rate)
29        avctx->sample_rate = 8000 * is_amr_wb;
30
31    if (!avctx->channels)
32        avctx->channels = 1;
33
34    avctx->frame_size = 160 * is_amr_wb;
35    avctx->sample_fmt = SAMPLE_FMT_S16;
36}
37
38#if CONFIG_LIBOPENCORE_AMRNB
39
40#include <opencore-amrnb/interf_dec.h>
41#include <opencore-amrnb/interf_enc.h>
42
43static const char nb_bitrate_unsupported[] =
44    "bitrate not supported: use one of 4.75k, 5.15k, 5.9k, 6.7k, 7.4k, 7.95k, 10.2k or 12.2k\n";
45
46/* Common code for fixed and float version*/
47typedef struct AMR_bitrates {
48    int       rate;
49    enum Mode mode;
50} AMR_bitrates;
51
52/* Match desired bitrate */
53static int getBitrateMode(int bitrate)
54{
55    /* make the correspondance between bitrate and mode */
56    AMR_bitrates rates[] = { { 4750, MR475},
57                             { 5150, MR515},
58                             { 5900, MR59},
59                             { 6700, MR67},
60                             { 7400, MR74},
61                             { 7950, MR795},
62                             {10200, MR102},
63                             {12200, MR122}, };
64    int i;
65
66    for (i = 0; i < 8; i++)
67        if (rates[i].rate == bitrate)
68            return rates[i].mode;
69    /* no bitrate matching, return an error */
70    return -1;
71}
72
73typedef struct AMRContext {
74    int   frameCount;
75    void *decState;
76    int  *enstate;
77    int   enc_bitrate;
78} AMRContext;
79
80static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
81{
82    AMRContext *s = avctx->priv_data;
83
84    s->frameCount = 0;
85    s->decState   = Decoder_Interface_init();
86    if (!s->decState) {
87        av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\r\n");
88        return -1;
89    }
90
91    amr_decode_fix_avctx(avctx);
92
93    if (avctx->channels > 1) {
94        av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
95        return -1;
96    }
97
98    return 0;
99}
100
101static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
102{
103    AMRContext *s = avctx->priv_data;
104
105    Decoder_Interface_exit(s->decState);
106    return 0;
107}
108
109static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
110                               int *data_size,
111                               const uint8_t *buf, int buf_size)
112{
113    AMRContext *s = avctx->priv_data;
114    const uint8_t *amrData = buf;
115    static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
116    enum Mode dec_mode;
117    int packet_size;
118
119    /* av_log(NULL, AV_LOG_DEBUG, "amr_decode_frame buf=%p buf_size=%d frameCount=%d!!\n",
120              buf, buf_size, s->frameCount); */
121
122    dec_mode = (buf[0] >> 3) & 0x000F;
123    packet_size = block_size[dec_mode] + 1;
124
125    if (packet_size > buf_size) {
126        av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
127               buf_size, packet_size);
128        return -1;
129    }
130
131    s->frameCount++;
132    /* av_log(NULL, AV_LOG_DEBUG, "packet_size=%d amrData= 0x%X %X %X %X\n",
133              packet_size, amrData[0], amrData[1], amrData[2], amrData[3]); */
134    /* call decoder */
135    Decoder_Interface_Decode(s->decState, amrData, data, 0);
136    *data_size = 160 * 2;
137
138    return packet_size;
139}
140
141AVCodec libopencore_amrnb_decoder = {
142    "libopencore_amrnb",
143    CODEC_TYPE_AUDIO,
144    CODEC_ID_AMR_NB,
145    sizeof(AMRContext),
146    amr_nb_decode_init,
147    NULL,
148    amr_nb_decode_close,
149    amr_nb_decode_frame,
150    .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
151};
152
153static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
154{
155    AMRContext *s = avctx->priv_data;
156
157    s->frameCount = 0;
158
159    if (avctx->sample_rate != 8000) {
160        av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
161        return -1;
162    }
163
164    if (avctx->channels != 1) {
165        av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
166        return -1;
167    }
168
169    avctx->frame_size  = 160;
170    avctx->coded_frame = avcodec_alloc_frame();
171
172    s->enstate=Encoder_Interface_init(0);
173    if (!s->enstate) {
174        av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
175        return -1;
176    }
177
178    if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
179        av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
180        return -1;
181    }
182
183    return 0;
184}
185
186static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
187{
188    AMRContext *s = avctx->priv_data;
189
190    Encoder_Interface_exit(s->enstate);
191    av_freep(&avctx->coded_frame);
192    return 0;
193}
194
195static int amr_nb_encode_frame(AVCodecContext *avctx,
196                               unsigned char *frame/*out*/,
197                               int buf_size, void *data/*in*/)
198{
199    AMRContext *s = avctx->priv_data;
200    int written;
201
202    if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
203        av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
204        return -1;
205    }
206
207    written = Encoder_Interface_Encode(s->enstate, s->enc_bitrate, data,
208                                       frame, 0);
209    /* av_log(NULL, AV_LOG_DEBUG, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
210              written, s->enc_bitrate, frame[0] ); */
211
212    return written;
213}
214
215AVCodec libopencore_amrnb_encoder = {
216    "libopencore_amrnb",
217    CODEC_TYPE_AUDIO,
218    CODEC_ID_AMR_NB,
219    sizeof(AMRContext),
220    amr_nb_encode_init,
221    amr_nb_encode_frame,
222    amr_nb_encode_close,
223    NULL,
224    .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
225    .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
226};
227
228#endif
229
230/* -----------AMR wideband ------------*/
231#if CONFIG_LIBOPENCORE_AMRWB
232
233#ifdef _TYPEDEF_H
234//To avoid duplicate typedefs from typedef in amr-nb
235#define typedef_h
236#endif
237
238#include <opencore-amrwb/dec_if.h>
239#include <opencore-amrwb/if_rom.h>
240
241static const char wb_bitrate_unsupported[] =
242    "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";
243
244/* Common code for fixed and float version*/
245typedef struct AMRWB_bitrates {
246    int rate;
247    int mode;
248} AMRWB_bitrates;
249
250typedef struct AMRWBContext {
251    int    frameCount;
252    void  *state;
253    int    mode;
254    Word16 allow_dtx;
255} AMRWBContext;
256
257static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
258{
259    AMRWBContext *s = avctx->priv_data;
260
261    s->frameCount = 0;
262    s->state      = D_IF_init();
263
264    amr_decode_fix_avctx(avctx);
265
266    if (avctx->channels > 1) {
267        av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
268        return -1;
269    }
270
271    return 0;
272}
273
274static int amr_wb_decode_frame(AVCodecContext *avctx,
275                               void *data, int *data_size,
276                               const uint8_t *buf, int buf_size)
277{
278    AMRWBContext *s = avctx->priv_data;
279    const uint8_t *amrData = buf;
280    int mode;
281    int packet_size;
282    static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
283
284    if (!buf_size)
285        /* nothing to do */
286        return 0;
287
288    mode = (amrData[0] >> 3) & 0x000F;
289    packet_size = block_size[mode];
290
291    if (packet_size > buf_size) {
292        av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
293               buf_size, packet_size + 1);
294        return -1;
295    }
296
297    s->frameCount++;
298    D_IF_decode(s->state, amrData, data, _good_frame);
299    *data_size = 320 * 2;
300    return packet_size;
301}
302
303static int amr_wb_decode_close(AVCodecContext *avctx)
304{
305    AMRWBContext *s = avctx->priv_data;
306
307    D_IF_exit(s->state);
308    return 0;
309}
310
311AVCodec libopencore_amrwb_decoder = {
312    "libopencore_amrwb",
313    CODEC_TYPE_AUDIO,
314    CODEC_ID_AMR_WB,
315    sizeof(AMRWBContext),
316    amr_wb_decode_init,
317    NULL,
318    amr_wb_decode_close,
319    amr_wb_decode_frame,
320    .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Wide-Band"),
321};
322
323#endif /* CONFIG_LIBOPENCORE_AMRWB */
324