libavcodec/libopencore-amr.c

   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 "config_components.h"
  23
  24 #include <inttypes.h>
  25
  26 #include "libavutil/avstring.h"
  27 #include "libavutil/channel_layout.h"
  28 #include "libavutil/common.h"
  29 #include "libavutil/mem.h"
  30 #include "libavutil/opt.h"
  31 #include "avcodec.h"
  32 #include "audio_frame_queue.h"
  33 #include "codec_internal.h"
  34 #include "decode.h"
  35 #include "encode.h"
  36
  37 #if CONFIG_LIBOPENCORE_AMRNB_DECODER || CONFIG_LIBOPENCORE_AMRWB_DECODER
  38 static int amr_decode_fix_avctx(AVCodecContext *avctx)
  39 {
  40     const int is_amr_wb = 1 + (avctx->codec_id == AV_CODEC_ID_AMR_WB);
  41
  42     if (!avctx->sample_rate)
  43         avctx->sample_rate = 8000 * is_amr_wb;
  44
  45     if (avctx->ch_layout.nb_channels > 1) {
  46         avpriv_report_missing_feature(avctx, "multi-channel AMR");
  47         return AVERROR_PATCHWELCOME;
  48     }
  49
  50     av_channel_layout_uninit(&avctx->ch_layout);
  51     avctx->ch_layout      = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
  52     avctx->sample_fmt     = AV_SAMPLE_FMT_S16;
  53     return 0;
  54 }
  55 #endif
  56
  57 #if CONFIG_LIBOPENCORE_AMRNB
  58
  59 #include <opencore-amrnb/interf_dec.h>
  60 #include <opencore-amrnb/interf_enc.h>
  61
  62 typedef struct AMRContext {
  63     AVClass *av_class;
  64     void *dec_state;
  65     void *enc_state;
  66     int   enc_bitrate;
  67     int   enc_mode;
  68     int   enc_dtx;
  69     int   enc_last_frame;
  70     AudioFrameQueue afq;
  71 } AMRContext;
  72
  73 #if CONFIG_LIBOPENCORE_AMRNB_DECODER
  74 static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
  75 {
  76     AMRContext *s  = avctx->priv_data;
  77     int ret;
  78
  79     if ((ret = amr_decode_fix_avctx(avctx)) < 0)
  80         return ret;
  81
  82     s->dec_state   = Decoder_Interface_init();
  83     if (!s->dec_state) {
  84         av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
  85         return -1;
  86     }
  87
  88     return 0;
  89 }
  90
  91 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
  92 {
  93     AMRContext *s = avctx->priv_data;
  94
  95     Decoder_Interface_exit(s->dec_state);
  96
  97     return 0;
  98 }
  99
 100 static int amr_nb_decode_frame(AVCodecContext *avctx, AVFrame *frame,
 101                                int *got_frame_ptr, AVPacket *avpkt)
 102 {
 103     const uint8_t *buf = avpkt->data;
 104     int buf_size       = avpkt->size;
 105     AMRContext *s      = avctx->priv_data;
 106     static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
 107     enum Mode dec_mode;
 108     int packet_size, ret;
 109
 110     ff_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%"PRId64"!!\n",
 111             buf, buf_size, avctx->frame_num);
 112
 113     /* get output buffer */
 114     frame->nb_samples = 160;
 115     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
 116         return ret;
 117
 118     dec_mode    = (buf[0] >> 3) & 0x000F;
 119     packet_size = block_size[dec_mode] + 1;
 120
 121     if (packet_size > buf_size) {
 122         av_log(avctx, AV_LOG_ERROR, "AMR frame too short (%d, should be %d)\n",
 123                buf_size, packet_size);
 124         return AVERROR_INVALIDDATA;
 125     }
 126
 127     ff_dlog(avctx, "packet_size=%d buf= 0x%"PRIx8" %"PRIx8" %"PRIx8" %"PRIx8"\n",
 128             packet_size, buf[0], buf[1], buf[2], buf[3]);
 129     /* call decoder */
 130     Decoder_Interface_Decode(s->dec_state, buf, (short *)frame->data[0], 0);
 131
 132     *got_frame_ptr = 1;
 133
 134     return packet_size;
 135 }
 136
 137 const FFCodec ff_libopencore_amrnb_decoder = {
 138     .p.name         = "libopencore_amrnb",
 139     CODEC_LONG_NAME("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
 140     .p.type         = AVMEDIA_TYPE_AUDIO,
 141     .p.id           = AV_CODEC_ID_AMR_NB,
 142     .caps_internal  = FF_CODEC_CAP_NOT_INIT_THREADSAFE,
 143     .priv_data_size = sizeof(AMRContext),
 144     .init           = amr_nb_decode_init,
 145     .close          = amr_nb_decode_close,
 146     FF_CODEC_DECODE_CB(amr_nb_decode_frame),
 147     .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
 148 };
 149 #endif /* CONFIG_LIBOPENCORE_AMRNB_DECODER */
 150
 151 #if CONFIG_LIBOPENCORE_AMRNB_ENCODER
 152 /* Common code for fixed and float version*/
 153 typedef struct AMR_bitrates {
 154     int       rate;
 155     enum Mode mode;
 156 } AMR_bitrates;
 157
 158 /* Match desired bitrate */
 159 static int get_bitrate_mode(int bitrate, void *log_ctx)
 160 {
 161     /* make the correspondence between bitrate and mode */
 162     static const AMR_bitrates rates[] = {
 163         { 4750, MR475 }, { 5150, MR515 }, {  5900, MR59  }, {  6700, MR67  },
 164         { 7400, MR74 },  { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
 165     };
 166     int i, best = -1, min_diff = 0;
 167     char log_buf[200];
 168
 169     for (i = 0; i < 8; i++) {
 170         if (rates[i].rate == bitrate)
 171             return rates[i].mode;
 172         if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
 173             best     = i;
 174             min_diff = abs(rates[i].rate - bitrate);
 175         }
 176     }
 177     /* no bitrate matching exactly, log a warning */
 178     snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
 179     for (i = 0; i < 8; i++)
 180         av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate    / 1000.f);
 181     av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
 182     av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
 183
 184     return best;
 185 }
 186
 187 static const AVOption options[] = {
 188     { "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 },
 189     { NULL }
 190 };
 191
 192 static const AVClass amrnb_class = {
 193     .class_name = "libopencore_amrnb",
 194     .item_name  = av_default_item_name,
 195     .option     = options,
 196     .version    = LIBAVUTIL_VERSION_INT,
 197 };
 198
 199 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
 200 {
 201     AMRContext *s = avctx->priv_data;
 202
 203     if (avctx->sample_rate != 8000 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
 204         av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
 205         return AVERROR(ENOSYS);
 206     }
 207
 208     if (avctx->ch_layout.nb_channels != 1) {
 209         av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
 210         return AVERROR(ENOSYS);
 211     }
 212
 213     avctx->frame_size  = 160;
 214     avctx->initial_padding = 50;
 215     ff_af_queue_init(avctx, &s->afq);
 216
 217     s->enc_state = Encoder_Interface_init(s->enc_dtx);
 218     if (!s->enc_state) {
 219         av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
 220         return -1;
 221     }
 222
 223     s->enc_mode    = get_bitrate_mode(avctx->bit_rate, avctx);
 224     s->enc_bitrate = avctx->bit_rate;
 225
 226     return 0;
 227 }
 228
 229 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
 230 {
 231     AMRContext *s = avctx->priv_data;
 232
 233     Encoder_Interface_exit(s->enc_state);
 234     ff_af_queue_close(&s->afq);
 235     return 0;
 236 }
 237
 238 static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
 239                                const AVFrame *frame, int *got_packet_ptr)
 240 {
 241     AMRContext *s = avctx->priv_data;
 242     int written, ret;
 243     int16_t *flush_buf = NULL;
 244     const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
 245
 246     if (s->enc_bitrate != avctx->bit_rate) {
 247         s->enc_mode    = get_bitrate_mode(avctx->bit_rate, avctx);
 248         s->enc_bitrate = avctx->bit_rate;
 249     }
 250
 251     if ((ret = ff_alloc_packet(avctx, avpkt, 32)) < 0)
 252         return ret;
 253
 254     if (frame) {
 255         if (frame->nb_samples < avctx->frame_size) {
 256             flush_buf = av_calloc(avctx->frame_size, sizeof(*flush_buf));
 257             if (!flush_buf)
 258                 return AVERROR(ENOMEM);
 259             memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf));
 260             samples = flush_buf;
 261             if (frame->nb_samples < avctx->frame_size - avctx->initial_padding)
 262                 s->enc_last_frame = -1;
 263         }
 264         if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) {
 265             av_freep(&flush_buf);
 266             return ret;
 267         }
 268     } else {
 269         if (s->enc_last_frame < 0)
 270             return 0;
 271         flush_buf = av_calloc(avctx->frame_size, sizeof(*flush_buf));
 272         if (!flush_buf)
 273             return AVERROR(ENOMEM);
 274         samples = flush_buf;
 275         s->enc_last_frame = -1;
 276     }
 277
 278     written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
 279                                        avpkt->data, 0);
 280     ff_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
 281             written, s->enc_mode, avpkt->data[0]);
 282
 283     /* Get the next frame pts/duration */
 284     ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
 285                        &avpkt->duration);
 286
 287     avpkt->size = written;
 288     *got_packet_ptr = 1;
 289     av_freep(&flush_buf);
 290     return 0;
 291 }
 292
 293 const FFCodec ff_libopencore_amrnb_encoder = {
 294     .p.name         = "libopencore_amrnb",
 295     CODEC_LONG_NAME("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
 296     .p.type         = AVMEDIA_TYPE_AUDIO,
 297     .p.id           = AV_CODEC_ID_AMR_NB,
 298     .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
 299                       AV_CODEC_CAP_SMALL_LAST_FRAME,
 300     .caps_internal  = FF_CODEC_CAP_NOT_INIT_THREADSAFE,
 301     .priv_data_size = sizeof(AMRContext),
 302     .init           = amr_nb_encode_init,
 303     FF_CODEC_ENCODE_CB(amr_nb_encode_frame),
 304     .close          = amr_nb_encode_close,
 305     .p.sample_fmts  = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
 306                                                      AV_SAMPLE_FMT_NONE },
 307     .p.priv_class   = &amrnb_class,
 308 };
 309 #endif /* CONFIG_LIBOPENCORE_AMRNB_ENCODER */
 310
 311 #endif /* CONFIG_LIBOPENCORE_AMRNB */
 312
 313 /* -----------AMR wideband ------------*/
 314 #if CONFIG_LIBOPENCORE_AMRWB_DECODER
 315
 316 #include <opencore-amrwb/dec_if.h>
 317 #include <opencore-amrwb/if_rom.h>
 318
 319 typedef struct AMRWBContext {
 320     void  *state;
 321 } AMRWBContext;
 322
 323 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
 324 {
 325     AMRWBContext *s = avctx->priv_data;
 326     int ret;
 327
 328     if ((ret = amr_decode_fix_avctx(avctx)) < 0)
 329         return ret;
 330
 331     s->state        = D_IF_init();
 332
 333     return 0;
 334 }
 335
 336 static int amr_wb_decode_frame(AVCodecContext *avctx, AVFrame *frame,
 337                                int *got_frame_ptr, AVPacket *avpkt)
 338 {
 339     const uint8_t *buf = avpkt->data;
 340     int buf_size       = avpkt->size;
 341     AMRWBContext *s    = avctx->priv_data;
 342     int mode, ret;
 343     int packet_size;
 344     static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
 345
 346     /* get output buffer */
 347     frame->nb_samples = 320;
 348     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
 349         return ret;
 350
 351     mode        = (buf[0] >> 3) & 0x000F;
 352     packet_size = block_size[mode];
 353
 354     if (packet_size > buf_size) {
 355         av_log(avctx, AV_LOG_ERROR, "AMR frame too short (%d, should be %d)\n",
 356                buf_size, packet_size + 1);
 357         return AVERROR_INVALIDDATA;
 358     }
 359     if (!packet_size) {
 360         av_log(avctx, AV_LOG_ERROR, "amr packet_size invalid\n");
 361         return AVERROR_INVALIDDATA;
 362     }
 363
 364     D_IF_decode(s->state, buf, (short *)frame->data[0], _good_frame);
 365
 366     *got_frame_ptr = 1;
 367
 368     return packet_size;
 369 }
 370
 371 static int amr_wb_decode_close(AVCodecContext *avctx)
 372 {
 373     AMRWBContext *s = avctx->priv_data;
 374
 375     D_IF_exit(s->state);
 376     return 0;
 377 }
 378
 379 const FFCodec ff_libopencore_amrwb_decoder = {
 380     .p.name         = "libopencore_amrwb",
 381     CODEC_LONG_NAME("OpenCORE AMR-WB (Adaptive Multi-Rate Wide-Band)"),
 382     .p.type         = AVMEDIA_TYPE_AUDIO,
 383     .p.id           = AV_CODEC_ID_AMR_WB,
 384     .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
 385     .p.wrapper_name = "libopencore_amrwb",
 386     .caps_internal  = FF_CODEC_CAP_NOT_INIT_THREADSAFE,
 387     .priv_data_size = sizeof(AMRWBContext),
 388     .init           = amr_wb_decode_init,
 389     .close          = amr_wb_decode_close,
 390     FF_CODEC_DECODE_CB(amr_wb_decode_frame),
 391 };
 392
 393 #endif /* CONFIG_LIBOPENCORE_AMRWB_DECODER */