libavcodec/libopencore-amr.c

   1 /*
   2  * AMR Audio decoder stub
   3  * Copyright (c) 2003 the ffmpeg project
   4  *
   5  * This file is part of Libav.
   6  *
   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.
  11  *
  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.
  16  *
  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
  20  */
  21
  22 #include "avcodec.h"
  23 #include "libavutil/avstring.h"
  24 #include "libavutil/opt.h"
  25
  26 static void amr_decode_fix_avctx(AVCodecContext *avctx)
  27 {
  28     const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);
  29
  30     if (!avctx->sample_rate)
  31         avctx->sample_rate = 8000 * is_amr_wb;
  32
  33     if (!avctx->channels)
  34         avctx->channels = 1;
  35
  36     avctx->frame_size = 160 * is_amr_wb;
  37     avctx->sample_fmt = AV_SAMPLE_FMT_S16;
  38 }
  39
  40 #if CONFIG_LIBOPENCORE_AMRNB
  41
  42 #include <opencore-amrnb/interf_dec.h>
  43 #include <opencore-amrnb/interf_enc.h>
  44
  45 /* Common code for fixed and float version*/
  46 typedef struct AMR_bitrates {
  47     int       rate;
  48     enum Mode mode;
  49 } AMR_bitrates;
  50
  51 /* Match desired bitrate */
  52 static int get_bitrate_mode(int bitrate, void *log_ctx)
  53 {
  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 }
  58     };
  59     int i, best = -1, min_diff = 0;
  60     char log_buf[200];
  61
  62     for (i = 0; i < 8; i++) {
  63         if (rates[i].rate == bitrate)
  64             return rates[i].mode;
  65         if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
  66             best     = i;
  67             min_diff = abs(rates[i].rate - bitrate);
  68         }
  69     }
  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);
  76
  77     return best;
  78 }
  79
  80 typedef struct AMRContext {
  81     AVClass *av_class;
  82     int   frame_count;
  83     void *dec_state;
  84     void *enc_state;
  85     int   enc_bitrate;
  86     int   enc_mode;
  87     int   enc_dtx;
  88 } AMRContext;
  89
  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 },
  92     { NULL }
  93 };
  94
  95 static const AVClass class = {
  96     "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT
  97 };
  98
  99 static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
 100 {
 101     AMRContext *s  = avctx->priv_data;
 102
 103     s->frame_count = 0;
 104     s->dec_state   = Decoder_Interface_init();
 105     if (!s->dec_state) {
 106         av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
 107         return -1;
 108     }
 109
 110     amr_decode_fix_avctx(avctx);
 111
 112     if (avctx->channels > 1) {
 113         av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
 114         return AVERROR(ENOSYS);
 115     }
 116
 117     return 0;
 118 }
 119
 120 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
 121 {
 122     AMRContext *s = avctx->priv_data;
 123
 124     Decoder_Interface_exit(s->dec_state);
 125     return 0;
 126 }
 127
 128 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
 129                                int *data_size, AVPacket *avpkt)
 130 {
 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 };
 135     enum Mode dec_mode;
 136     int packet_size;
 137
 138     av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
 139             buf, buf_size, s->frame_count);
 140
 141     dec_mode    = (buf[0] >> 3) & 0x000F;
 142     packet_size = block_size[dec_mode] + 1;
 143
 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;
 148     }
 149
 150     s->frame_count++;
 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]);
 153     /* call decoder */
 154     Decoder_Interface_Decode(s->dec_state, buf, data, 0);
 155     *data_size = 160 * 2;
 156
 157     return packet_size;
 158 }
 159
 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"),
 169 };
 170
 171 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
 172 {
 173     AMRContext *s = avctx->priv_data;
 174
 175     s->frame_count = 0;
 176
 177     if (avctx->sample_rate != 8000) {
 178         av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
 179         return AVERROR(ENOSYS);
 180     }
 181
 182     if (avctx->channels != 1) {
 183         av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
 184         return AVERROR(ENOSYS);
 185     }
 186
 187     avctx->frame_size  = 160;
 188     avctx->coded_frame = avcodec_alloc_frame();
 189
 190     s->enc_state = Encoder_Interface_init(s->enc_dtx);
 191     if (!s->enc_state) {
 192         av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
 193         return -1;
 194     }
 195
 196     s->enc_mode    = get_bitrate_mode(avctx->bit_rate, avctx);
 197     s->enc_bitrate = avctx->bit_rate;
 198
 199     return 0;
 200 }
 201
 202 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
 203 {
 204     AMRContext *s = avctx->priv_data;
 205
 206     Encoder_Interface_exit(s->enc_state);
 207     av_freep(&avctx->coded_frame);
 208     return 0;
 209 }
 210
 211 static int amr_nb_encode_frame(AVCodecContext *avctx,
 212                                unsigned char *frame/*out*/,
 213                                int buf_size, void *data/*in*/)
 214 {
 215     AMRContext *s = avctx->priv_data;
 216     int written;
 217
 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;
 221     }
 222
 223     written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, data,
 224                                        frame, 0);
 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]);
 227
 228     return written;
 229 }
 230
 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,
 242 };
 243
 244 #endif
 245
 246 /* -----------AMR wideband ------------*/
 247 #if CONFIG_LIBOPENCORE_AMRWB
 248
 249 #include <opencore-amrwb/dec_if.h>
 250 #include <opencore-amrwb/if_rom.h>
 251
 252 typedef struct AMRWBContext {
 253     void  *state;
 254 } AMRWBContext;
 255
 256 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
 257 {
 258     AMRWBContext *s = avctx->priv_data;
 259
 260     s->state        = D_IF_init();
 261
 262     amr_decode_fix_avctx(avctx);
 263
 264     if (avctx->channels > 1) {
 265         av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
 266         return AVERROR(ENOSYS);
 267     }
 268
 269     return 0;
 270 }
 271
 272 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
 273                                int *data_size, AVPacket *avpkt)
 274 {
 275     const uint8_t *buf = avpkt->data;
 276     int buf_size       = avpkt->size;
 277     AMRWBContext *s    = avctx->priv_data;
 278     int mode;
 279     int packet_size;
 280     static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
 281
 282     if (!buf_size)
 283         /* nothing to do */
 284         return 0;
 285
 286     mode        = (buf[0] >> 3) & 0x000F;
 287     packet_size = block_size[mode];
 288
 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;
 293     }
 294
 295     D_IF_decode(s->state, buf, data, _good_frame);
 296     *data_size = 320 * 2;
 297     return packet_size;
 298 }
 299
 300 static int amr_wb_decode_close(AVCodecContext *avctx)
 301 {
 302     AMRWBContext *s = avctx->priv_data;
 303
 304     D_IF_exit(s->state);
 305     return 0;
 306 }
 307
 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"),
 317 };
 318
 319 #endif /* CONFIG_LIBOPENCORE_AMRWB */