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, AVPacket *avpkt)
111{
112    const uint8_t *buf = avpkt->data;
113    int buf_size       = avpkt->size;
114    AMRContext *s = avctx->priv_data;
115    const uint8_t *amrData = buf;
116    static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
117    enum Mode dec_mode;
118    int packet_size;
119
120    /* av_log(NULL, AV_LOG_DEBUG, "amr_decode_frame buf=%p buf_size=%d frameCount=%d!!\n",
121              buf, buf_size, s->frameCount); */
122
123    dec_mode = (buf[0] >> 3) & 0x000F;
124    packet_size = block_size[dec_mode] + 1;
125
126    if (packet_size > buf_size) {
127        av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
128               buf_size, packet_size);
129        return -1;
130    }
131
132    s->frameCount++;
133    /* av_log(NULL, AV_LOG_DEBUG, "packet_size=%d amrData= 0x%X %X %X %X\n",
134              packet_size, amrData[0], amrData[1], amrData[2], amrData[3]); */
135    /* call decoder */
136    Decoder_Interface_Decode(s->decState, amrData, data, 0);
137    *data_size = 160 * 2;
138
139    return packet_size;
140}
141
142AVCodec libopencore_amrnb_decoder = {
143    "libopencore_amrnb",
144    AVMEDIA_TYPE_AUDIO,
145    CODEC_ID_AMR_NB,
146    sizeof(AMRContext),
147    amr_nb_decode_init,
148    NULL,
149    amr_nb_decode_close,
150    amr_nb_decode_frame,
151    .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
152};
153
154static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
155{
156    AMRContext *s = avctx->priv_data;
157
158    s->frameCount = 0;
159
160    if (avctx->sample_rate != 8000) {
161        av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
162        return -1;
163    }
164
165    if (avctx->channels != 1) {
166        av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
167        return -1;
168    }
169
170    avctx->frame_size  = 160;
171    avctx->coded_frame = avcodec_alloc_frame();
172
173    s->enstate=Encoder_Interface_init(0);
174    if (!s->enstate) {
175        av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
176        return -1;
177    }
178
179    if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
180        av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
181        return -1;
182    }
183
184    return 0;
185}
186
187static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
188{
189    AMRContext *s = avctx->priv_data;
190
191    Encoder_Interface_exit(s->enstate);
192    av_freep(&avctx->coded_frame);
193    return 0;
194}
195
196static int amr_nb_encode_frame(AVCodecContext *avctx,
197                               unsigned char *frame/*out*/,
198                               int buf_size, void *data/*in*/)
199{
200    AMRContext *s = avctx->priv_data;
201    int written;
202
203    if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
204        av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
205        return -1;
206    }
207
208    written = Encoder_Interface_Encode(s->enstate, s->enc_bitrate, data,
209                                       frame, 0);
210    /* av_log(NULL, AV_LOG_DEBUG, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
211              written, s->enc_bitrate, frame[0] ); */
212
213    return written;
214}
215
216AVCodec libopencore_amrnb_encoder = {
217    "libopencore_amrnb",
218    AVMEDIA_TYPE_AUDIO,
219    CODEC_ID_AMR_NB,
220    sizeof(AMRContext),
221    amr_nb_encode_init,
222    amr_nb_encode_frame,
223    amr_nb_encode_close,
224    NULL,
225    .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
226    .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
227};
228
229#endif
230
231/* -----------AMR wideband ------------*/
232#if CONFIG_LIBOPENCORE_AMRWB
233
234#ifdef _TYPEDEF_H
235//To avoid duplicate typedefs from typedef in amr-nb
236#define typedef_h
237#endif
238
239#include <opencore-amrwb/dec_if.h>
240#include <opencore-amrwb/if_rom.h>
241
242static const char wb_bitrate_unsupported[] =
243    "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";
244
245/* Common code for fixed and float version*/
246typedef struct AMRWB_bitrates {
247    int rate;
248    int mode;
249} AMRWB_bitrates;
250
251typedef struct AMRWBContext {
252    int    frameCount;
253    void  *state;
254    int    mode;
255    Word16 allow_dtx;
256} AMRWBContext;
257
258static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
259{
260    AMRWBContext *s = avctx->priv_data;
261
262    s->frameCount = 0;
263    s->state      = D_IF_init();
264
265    amr_decode_fix_avctx(avctx);
266
267    if (avctx->channels > 1) {
268        av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
269        return -1;
270    }
271
272    return 0;
273}
274
275static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
276                               int *data_size, AVPacket *avpkt)
277{
278    const uint8_t *buf = avpkt->data;
279    int buf_size       = avpkt->size;
280    AMRWBContext *s = avctx->priv_data;
281    const uint8_t *amrData = buf;
282    int mode;
283    int packet_size;
284    static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
285
286    if (!buf_size)
287        /* nothing to do */
288        return 0;
289
290    mode = (amrData[0] >> 3) & 0x000F;
291    packet_size = block_size[mode];
292
293    if (packet_size > buf_size) {
294        av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
295               buf_size, packet_size + 1);
296        return -1;
297    }
298
299    s->frameCount++;
300    D_IF_decode(s->state, amrData, data, _good_frame);
301    *data_size = 320 * 2;
302    return packet_size;
303}
304
305static int amr_wb_decode_close(AVCodecContext *avctx)
306{
307    AMRWBContext *s = avctx->priv_data;
308
309    D_IF_exit(s->state);
310    return 0;
311}
312
313AVCodec libopencore_amrwb_decoder = {
314    "libopencore_amrwb",
315    AVMEDIA_TYPE_AUDIO,
316    CODEC_ID_AMR_WB,
317    sizeof(AMRWBContext),
318    amr_wb_decode_init,
319    NULL,
320    amr_wb_decode_close,
321    amr_wb_decode_frame,
322    .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Wide-Band"),
323};
324
325#endif /* CONFIG_LIBOPENCORE_AMRWB */
326