1/* 2 * AAC decoder wrapper 3 * Copyright (c) 2012 Martin Storsjo 4 * 5 * This file is part of FFmpeg. 6 * 7 * Permission to use, copy, modify, and/or distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20#include <fdk-aac/aacdecoder_lib.h> 21 22#include "libavutil/channel_layout.h" 23#include "libavutil/common.h" 24#include "libavutil/opt.h" 25#include "avcodec.h" 26#include "internal.h" 27 28enum ConcealMethod { 29 CONCEAL_METHOD_SPECTRAL_MUTING = 0, 30 CONCEAL_METHOD_NOISE_SUBSTITUTION = 1, 31 CONCEAL_METHOD_ENERGY_INTERPOLATION = 2, 32 CONCEAL_METHOD_NB, 33}; 34 35typedef struct FDKAACDecContext { 36 const AVClass *class; 37 HANDLE_AACDECODER handle; 38 int initialized; 39 enum ConcealMethod conceal_method; 40} FDKAACDecContext; 41 42#define OFFSET(x) offsetof(FDKAACDecContext, x) 43#define AD AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM 44static const AVOption fdk_aac_dec_options[] = { 45 { "conceal", "Error concealment method", OFFSET(conceal_method), AV_OPT_TYPE_INT, { .i64 = CONCEAL_METHOD_NOISE_SUBSTITUTION }, CONCEAL_METHOD_SPECTRAL_MUTING, CONCEAL_METHOD_NB - 1, AD, "conceal" }, 46 { "spectral", "Spectral muting", 0, AV_OPT_TYPE_CONST, { .i64 = CONCEAL_METHOD_SPECTRAL_MUTING }, INT_MIN, INT_MAX, AD, "conceal" }, 47 { "noise", "Noise Substitution", 0, AV_OPT_TYPE_CONST, { .i64 = CONCEAL_METHOD_NOISE_SUBSTITUTION }, INT_MIN, INT_MAX, AD, "conceal" }, 48 { "energy", "Energy Interpolation", 0, AV_OPT_TYPE_CONST, { .i64 = CONCEAL_METHOD_ENERGY_INTERPOLATION }, INT_MIN, INT_MAX, AD, "conceal" }, 49 { NULL } 50}; 51 52static const AVClass fdk_aac_dec_class = { 53 "libfdk-aac decoder", av_default_item_name, fdk_aac_dec_options, LIBAVUTIL_VERSION_INT 54}; 55 56static int get_stream_info(AVCodecContext *avctx) 57{ 58 FDKAACDecContext *s = avctx->priv_data; 59 CStreamInfo *info = aacDecoder_GetStreamInfo(s->handle); 60 int channel_counts[9] = { 0 }; 61 int i, ch_error = 0; 62 uint64_t ch_layout = 0; 63 64 if (!info) { 65 av_log(avctx, AV_LOG_ERROR, "Unable to get stream info\n"); 66 return AVERROR_UNKNOWN; 67 } 68 69 if (info->sampleRate <= 0) { 70 av_log(avctx, AV_LOG_ERROR, "Stream info not initialized\n"); 71 return AVERROR_UNKNOWN; 72 } 73 avctx->sample_rate = info->sampleRate; 74 avctx->frame_size = info->frameSize; 75 76 for (i = 0; i < info->numChannels; i++) { 77 AUDIO_CHANNEL_TYPE ctype = info->pChannelType[i]; 78 if (ctype <= ACT_NONE || ctype > ACT_TOP) { 79 av_log(avctx, AV_LOG_WARNING, "unknown channel type\n"); 80 break; 81 } 82 channel_counts[ctype]++; 83 } 84 av_log(avctx, AV_LOG_DEBUG, 85 "%d channels - front:%d side:%d back:%d lfe:%d top:%d\n", 86 info->numChannels, 87 channel_counts[ACT_FRONT], channel_counts[ACT_SIDE], 88 channel_counts[ACT_BACK], channel_counts[ACT_LFE], 89 channel_counts[ACT_FRONT_TOP] + channel_counts[ACT_SIDE_TOP] + 90 channel_counts[ACT_BACK_TOP] + channel_counts[ACT_TOP]); 91 92 switch (channel_counts[ACT_FRONT]) { 93 case 4: 94 ch_layout |= AV_CH_LAYOUT_STEREO | AV_CH_FRONT_LEFT_OF_CENTER | 95 AV_CH_FRONT_RIGHT_OF_CENTER; 96 break; 97 case 3: 98 ch_layout |= AV_CH_LAYOUT_STEREO | AV_CH_FRONT_CENTER; 99 break; 100 case 2: 101 ch_layout |= AV_CH_LAYOUT_STEREO; 102 break; 103 case 1: 104 ch_layout |= AV_CH_FRONT_CENTER; 105 break; 106 default: 107 av_log(avctx, AV_LOG_WARNING, 108 "unsupported number of front channels: %d\n", 109 channel_counts[ACT_FRONT]); 110 ch_error = 1; 111 break; 112 } 113 if (channel_counts[ACT_SIDE] > 0) { 114 if (channel_counts[ACT_SIDE] == 2) { 115 ch_layout |= AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT; 116 } else { 117 av_log(avctx, AV_LOG_WARNING, 118 "unsupported number of side channels: %d\n", 119 channel_counts[ACT_SIDE]); 120 ch_error = 1; 121 } 122 } 123 if (channel_counts[ACT_BACK] > 0) { 124 switch (channel_counts[ACT_BACK]) { 125 case 3: 126 ch_layout |= AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT | AV_CH_BACK_CENTER; 127 break; 128 case 2: 129 ch_layout |= AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT; 130 break; 131 case 1: 132 ch_layout |= AV_CH_BACK_CENTER; 133 break; 134 default: 135 av_log(avctx, AV_LOG_WARNING, 136 "unsupported number of back channels: %d\n", 137 channel_counts[ACT_BACK]); 138 ch_error = 1; 139 break; 140 } 141 } 142 if (channel_counts[ACT_LFE] > 0) { 143 if (channel_counts[ACT_LFE] == 1) { 144 ch_layout |= AV_CH_LOW_FREQUENCY; 145 } else { 146 av_log(avctx, AV_LOG_WARNING, 147 "unsupported number of LFE channels: %d\n", 148 channel_counts[ACT_LFE]); 149 ch_error = 1; 150 } 151 } 152 if (!ch_error && 153 av_get_channel_layout_nb_channels(ch_layout) != info->numChannels) { 154 av_log(avctx, AV_LOG_WARNING, "unsupported channel configuration\n"); 155 ch_error = 1; 156 } 157 if (ch_error) 158 avctx->channel_layout = 0; 159 else 160 avctx->channel_layout = ch_layout; 161 162 avctx->channels = info->numChannels; 163 164 return 0; 165} 166 167static av_cold int fdk_aac_decode_close(AVCodecContext *avctx) 168{ 169 FDKAACDecContext *s = avctx->priv_data; 170 171 if (s->handle) 172 aacDecoder_Close(s->handle); 173 174 return 0; 175} 176 177static av_cold int fdk_aac_decode_init(AVCodecContext *avctx) 178{ 179 FDKAACDecContext *s = avctx->priv_data; 180 AAC_DECODER_ERROR err; 181 182 s->handle = aacDecoder_Open(avctx->extradata_size ? TT_MP4_RAW : TT_MP4_ADTS, 1); 183 if (!s->handle) { 184 av_log(avctx, AV_LOG_ERROR, "Error opening decoder\n"); 185 return AVERROR_UNKNOWN; 186 } 187 188 if (avctx->extradata_size) { 189 if ((err = aacDecoder_ConfigRaw(s->handle, &avctx->extradata, 190 &avctx->extradata_size)) != AAC_DEC_OK) { 191 av_log(avctx, AV_LOG_ERROR, "Unable to set extradata\n"); 192 return AVERROR_INVALIDDATA; 193 } 194 } 195 196 if ((err = aacDecoder_SetParam(s->handle, AAC_CONCEAL_METHOD, 197 s->conceal_method)) != AAC_DEC_OK) { 198 av_log(avctx, AV_LOG_ERROR, "Unable to set error concealment method\n"); 199 return AVERROR_UNKNOWN; 200 } 201 202 avctx->sample_fmt = AV_SAMPLE_FMT_S16; 203 204 return 0; 205} 206 207static int fdk_aac_decode_frame(AVCodecContext *avctx, void *data, 208 int *got_frame_ptr, AVPacket *avpkt) 209{ 210 FDKAACDecContext *s = avctx->priv_data; 211 AVFrame *frame = data; 212 int ret; 213 AAC_DECODER_ERROR err; 214 UINT valid = avpkt->size; 215 uint8_t *buf, *tmpptr = NULL; 216 int buf_size; 217 218 err = aacDecoder_Fill(s->handle, &avpkt->data, &avpkt->size, &valid); 219 if (err != AAC_DEC_OK) { 220 av_log(avctx, AV_LOG_ERROR, "aacDecoder_Fill() failed: %x\n", err); 221 return AVERROR_INVALIDDATA; 222 } 223 224 if (s->initialized) { 225 frame->nb_samples = avctx->frame_size; 226 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) 227 return ret; 228 buf = frame->extended_data[0]; 229 buf_size = avctx->channels * frame->nb_samples * 230 av_get_bytes_per_sample(avctx->sample_fmt); 231 } else { 232 buf_size = 50 * 1024; 233 buf = tmpptr = av_malloc(buf_size); 234 if (!buf) 235 return AVERROR(ENOMEM); 236 } 237 238 err = aacDecoder_DecodeFrame(s->handle, (INT_PCM *) buf, buf_size, 0); 239 if (err == AAC_DEC_NOT_ENOUGH_BITS) { 240 ret = avpkt->size - valid; 241 goto end; 242 } 243 if (err != AAC_DEC_OK) { 244 av_log(avctx, AV_LOG_ERROR, 245 "aacDecoder_DecodeFrame() failed: %x\n", err); 246 ret = AVERROR_UNKNOWN; 247 goto end; 248 } 249 250 if (!s->initialized) { 251 if ((ret = get_stream_info(avctx)) < 0) 252 goto end; 253 s->initialized = 1; 254 frame->nb_samples = avctx->frame_size; 255 } 256 257 if (tmpptr) { 258 frame->nb_samples = avctx->frame_size; 259 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) 260 goto end; 261 memcpy(frame->extended_data[0], tmpptr, 262 avctx->channels * avctx->frame_size * 263 av_get_bytes_per_sample(avctx->sample_fmt)); 264 } 265 266 *got_frame_ptr = 1; 267 ret = avpkt->size - valid; 268 269end: 270 av_free(tmpptr); 271 return ret; 272} 273 274static av_cold void fdk_aac_decode_flush(AVCodecContext *avctx) 275{ 276 FDKAACDecContext *s = avctx->priv_data; 277 AAC_DECODER_ERROR err; 278 279 if (!s->handle) 280 return; 281 282 if ((err = aacDecoder_SetParam(s->handle, 283 AAC_TPDEC_CLEAR_BUFFER, 1)) != AAC_DEC_OK) 284 av_log(avctx, AV_LOG_WARNING, "failed to clear buffer when flushing\n"); 285} 286 287AVCodec ff_libfdk_aac_decoder = { 288 .name = "libfdk_aac", 289 .long_name = NULL_IF_CONFIG_SMALL("Fraunhofer FDK AAC"), 290 .type = AVMEDIA_TYPE_AUDIO, 291 .id = AV_CODEC_ID_AAC, 292 .priv_data_size = sizeof(FDKAACDecContext), 293 .init = fdk_aac_decode_init, 294 .decode = fdk_aac_decode_frame, 295 .close = fdk_aac_decode_close, 296 .flush = fdk_aac_decode_flush, 297 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_CHANNEL_CONF, 298 .priv_class = &fdk_aac_dec_class, 299}; 300