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libfdk-aacenc.c
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1 /*
2  * AAC encoder wrapper
3  * Copyright (c) 2012 Martin Storsjo
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 <fdk-aac/aacenc_lib.h>
23 
25 #include "libavutil/common.h"
26 #include "libavutil/opt.h"
27 #include "avcodec.h"
28 #include "audio_frame_queue.h"
29 #include "internal.h"
30 
31 typedef struct AACContext {
32  const AVClass *class;
33  HANDLE_AACENCODER handle;
35  int eld_sbr;
36  int signaling;
37  int latm;
39  int vbr;
40 
42 } AACContext;
43 
44 static const AVOption aac_enc_options[] = {
45  { "afterburner", "Afterburner (improved quality)", offsetof(AACContext, afterburner), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
46  { "eld_sbr", "Enable SBR for ELD (for SBR in other configurations, use the -profile parameter)", offsetof(AACContext, eld_sbr), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
47  { "signaling", "SBR/PS signaling style", offsetof(AACContext, signaling), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 2, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM, "signaling" },
48  { "default", "Choose signaling implicitly (explicit hierarchical by default, implicit if global header is disabled)", 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, 0, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM, "signaling" },
49  { "implicit", "Implicit backwards compatible signaling", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, 0, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM, "signaling" },
50  { "explicit_sbr", "Explicit SBR, implicit PS signaling", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, 0, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM, "signaling" },
51  { "explicit_hierarchical", "Explicit hierarchical signaling", 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, 0, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM, "signaling" },
52  { "latm", "Output LATM/LOAS encapsulated data", offsetof(AACContext, latm), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
53  { "header_period", "StreamMuxConfig and PCE repetition period (in frames)", offsetof(AACContext, header_period), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 0xffff, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
54  { "vbr", "VBR mode (1-5)", offsetof(AACContext, vbr), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 5, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
55  { NULL }
56 };
57 
58 static const AVClass aac_enc_class = {
60 };
61 
62 static const char *aac_get_error(AACENC_ERROR err)
63 {
64  switch (err) {
65  case AACENC_OK:
66  return "No error";
67  case AACENC_INVALID_HANDLE:
68  return "Invalid handle";
69  case AACENC_MEMORY_ERROR:
70  return "Memory allocation error";
71  case AACENC_UNSUPPORTED_PARAMETER:
72  return "Unsupported parameter";
73  case AACENC_INVALID_CONFIG:
74  return "Invalid config";
75  case AACENC_INIT_ERROR:
76  return "Initialization error";
77  case AACENC_INIT_AAC_ERROR:
78  return "AAC library initialization error";
79  case AACENC_INIT_SBR_ERROR:
80  return "SBR library initialization error";
81  case AACENC_INIT_TP_ERROR:
82  return "Transport library initialization error";
83  case AACENC_INIT_META_ERROR:
84  return "Metadata library initialization error";
85  case AACENC_ENCODE_ERROR:
86  return "Encoding error";
87  case AACENC_ENCODE_EOF:
88  return "End of file";
89  default:
90  return "Unknown error";
91  }
92 }
93 
94 static int aac_encode_close(AVCodecContext *avctx)
95 {
96  AACContext *s = avctx->priv_data;
97 
98  if (s->handle)
99  aacEncClose(&s->handle);
100  av_freep(&avctx->extradata);
101  ff_af_queue_close(&s->afq);
102 
103  return 0;
104 }
105 
107 {
108  AACContext *s = avctx->priv_data;
109  int ret = AVERROR(EINVAL);
110  AACENC_InfoStruct info = { 0 };
111  CHANNEL_MODE mode;
112  AACENC_ERROR err;
113  int aot = FF_PROFILE_AAC_LOW + 1;
114  int sce = 0, cpe = 0;
115 
116  if ((err = aacEncOpen(&s->handle, 0, avctx->channels)) != AACENC_OK) {
117  av_log(avctx, AV_LOG_ERROR, "Unable to open the encoder: %s\n",
118  aac_get_error(err));
119  goto error;
120  }
121 
122  if (avctx->profile != FF_PROFILE_UNKNOWN)
123  aot = avctx->profile + 1;
124 
125  if ((err = aacEncoder_SetParam(s->handle, AACENC_AOT, aot)) != AACENC_OK) {
126  av_log(avctx, AV_LOG_ERROR, "Unable to set the AOT %d: %s\n",
127  aot, aac_get_error(err));
128  goto error;
129  }
130 
131  if (aot == FF_PROFILE_AAC_ELD + 1 && s->eld_sbr) {
132  if ((err = aacEncoder_SetParam(s->handle, AACENC_SBR_MODE,
133  1)) != AACENC_OK) {
134  av_log(avctx, AV_LOG_ERROR, "Unable to enable SBR for ELD: %s\n",
135  aac_get_error(err));
136  goto error;
137  }
138  }
139 
140  if ((err = aacEncoder_SetParam(s->handle, AACENC_SAMPLERATE,
141  avctx->sample_rate)) != AACENC_OK) {
142  av_log(avctx, AV_LOG_ERROR, "Unable to set the sample rate %d: %s\n",
143  avctx->sample_rate, aac_get_error(err));
144  goto error;
145  }
146 
147  switch (avctx->channels) {
148  case 1: mode = MODE_1; sce = 1; cpe = 0; break;
149  case 2: mode = MODE_2; sce = 0; cpe = 1; break;
150  case 3: mode = MODE_1_2; sce = 1; cpe = 1; break;
151  case 4: mode = MODE_1_2_1; sce = 2; cpe = 1; break;
152  case 5: mode = MODE_1_2_2; sce = 1; cpe = 2; break;
153  case 6: mode = MODE_1_2_2_1; sce = 2; cpe = 2; break;
154  default:
155  av_log(avctx, AV_LOG_ERROR,
156  "Unsupported number of channels %d\n", avctx->channels);
157  goto error;
158  }
159 
160  if ((err = aacEncoder_SetParam(s->handle, AACENC_CHANNELMODE,
161  mode)) != AACENC_OK) {
162  av_log(avctx, AV_LOG_ERROR,
163  "Unable to set channel mode %d: %s\n", mode, aac_get_error(err));
164  goto error;
165  }
166 
167  if ((err = aacEncoder_SetParam(s->handle, AACENC_CHANNELORDER,
168  1)) != AACENC_OK) {
169  av_log(avctx, AV_LOG_ERROR,
170  "Unable to set wav channel order %d: %s\n",
171  mode, aac_get_error(err));
172  goto error;
173  }
174 
175  if (avctx->flags & CODEC_FLAG_QSCALE || s->vbr) {
176  int mode = s->vbr ? s->vbr : avctx->global_quality;
177  if (mode < 1 || mode > 5) {
178  av_log(avctx, AV_LOG_WARNING,
179  "VBR quality %d out of range, should be 1-5\n", mode);
180  mode = av_clip(mode, 1, 5);
181  }
182  av_log(avctx, AV_LOG_WARNING,
183  "Note, the VBR setting is unsupported and only works with "
184  "some parameter combinations\n");
185  if ((err = aacEncoder_SetParam(s->handle, AACENC_BITRATEMODE,
186  mode)) != AACENC_OK) {
187  av_log(avctx, AV_LOG_ERROR, "Unable to set the VBR bitrate mode %d: %s\n",
188  mode, aac_get_error(err));
189  goto error;
190  }
191  } else {
192  if (avctx->bit_rate <= 0) {
193  if (avctx->profile == FF_PROFILE_AAC_HE_V2) {
194  sce = 1;
195  cpe = 0;
196  }
197  avctx->bit_rate = (96*sce + 128*cpe) * avctx->sample_rate / 44;
198  if (avctx->profile == FF_PROFILE_AAC_HE ||
199  avctx->profile == FF_PROFILE_AAC_HE_V2 ||
200  avctx->profile == FF_PROFILE_MPEG2_AAC_HE ||
201  s->eld_sbr)
202  avctx->bit_rate /= 2;
203  }
204  if ((err = aacEncoder_SetParam(s->handle, AACENC_BITRATE,
205  avctx->bit_rate)) != AACENC_OK) {
206  av_log(avctx, AV_LOG_ERROR, "Unable to set the bitrate %d: %s\n",
207  avctx->bit_rate, aac_get_error(err));
208  goto error;
209  }
210  }
211 
212  /* Choose bitstream format - if global header is requested, use
213  * raw access units, otherwise use ADTS. */
214  if ((err = aacEncoder_SetParam(s->handle, AACENC_TRANSMUX,
215  avctx->flags & CODEC_FLAG_GLOBAL_HEADER ? 0 : s->latm ? 10 : 2)) != AACENC_OK) {
216  av_log(avctx, AV_LOG_ERROR, "Unable to set the transmux format: %s\n",
217  aac_get_error(err));
218  goto error;
219  }
220 
221  if (s->latm && s->header_period) {
222  if ((err = aacEncoder_SetParam(s->handle, AACENC_HEADER_PERIOD,
223  s->header_period)) != AACENC_OK) {
224  av_log(avctx, AV_LOG_ERROR, "Unable to set header period: %s\n",
225  aac_get_error(err));
226  goto error;
227  }
228  }
229 
230  /* If no signaling mode is chosen, use explicit hierarchical signaling
231  * if using mp4 mode (raw access units, with global header) and
232  * implicit signaling if using ADTS. */
233  if (s->signaling < 0)
234  s->signaling = avctx->flags & CODEC_FLAG_GLOBAL_HEADER ? 2 : 0;
235 
236  if ((err = aacEncoder_SetParam(s->handle, AACENC_SIGNALING_MODE,
237  s->signaling)) != AACENC_OK) {
238  av_log(avctx, AV_LOG_ERROR, "Unable to set signaling mode %d: %s\n",
239  s->signaling, aac_get_error(err));
240  goto error;
241  }
242 
243  if ((err = aacEncoder_SetParam(s->handle, AACENC_AFTERBURNER,
244  s->afterburner)) != AACENC_OK) {
245  av_log(avctx, AV_LOG_ERROR, "Unable to set afterburner to %d: %s\n",
246  s->afterburner, aac_get_error(err));
247  goto error;
248  }
249 
250  if (avctx->cutoff > 0) {
251  if (avctx->cutoff < (avctx->sample_rate + 255) >> 8 || avctx->cutoff > 20000) {
252  av_log(avctx, AV_LOG_ERROR, "cutoff valid range is %d-20000\n",
253  (avctx->sample_rate + 255) >> 8);
254  goto error;
255  }
256  if ((err = aacEncoder_SetParam(s->handle, AACENC_BANDWIDTH,
257  avctx->cutoff)) != AACENC_OK) {
258  av_log(avctx, AV_LOG_ERROR, "Unable to set the encoder bandwidth to %d: %s\n",
259  avctx->cutoff, aac_get_error(err));
260  goto error;
261  }
262  }
263 
264  if ((err = aacEncEncode(s->handle, NULL, NULL, NULL, NULL)) != AACENC_OK) {
265  av_log(avctx, AV_LOG_ERROR, "Unable to initialize the encoder: %s\n",
266  aac_get_error(err));
267  return AVERROR(EINVAL);
268  }
269 
270  if ((err = aacEncInfo(s->handle, &info)) != AACENC_OK) {
271  av_log(avctx, AV_LOG_ERROR, "Unable to get encoder info: %s\n",
272  aac_get_error(err));
273  goto error;
274  }
275 
276  avctx->frame_size = info.frameLength;
277  avctx->delay = info.encoderDelay;
278  ff_af_queue_init(avctx, &s->afq);
279 
280  if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
281  avctx->extradata_size = info.confSize;
282  avctx->extradata = av_mallocz(avctx->extradata_size +
284  if (!avctx->extradata) {
285  ret = AVERROR(ENOMEM);
286  goto error;
287  }
288 
289  memcpy(avctx->extradata, info.confBuf, info.confSize);
290  }
291  return 0;
292 error:
293  aac_encode_close(avctx);
294  return ret;
295 }
296 
297 static int aac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
298  const AVFrame *frame, int *got_packet_ptr)
299 {
300  AACContext *s = avctx->priv_data;
301  AACENC_BufDesc in_buf = { 0 }, out_buf = { 0 };
302  AACENC_InArgs in_args = { 0 };
303  AACENC_OutArgs out_args = { 0 };
304  int in_buffer_identifier = IN_AUDIO_DATA;
305  int in_buffer_size, in_buffer_element_size;
306  int out_buffer_identifier = OUT_BITSTREAM_DATA;
307  int out_buffer_size, out_buffer_element_size;
308  void *in_ptr, *out_ptr;
309  int ret;
310  AACENC_ERROR err;
311 
312  /* handle end-of-stream small frame and flushing */
313  if (!frame) {
314  in_args.numInSamples = -1;
315  } else {
316  in_ptr = frame->data[0];
317  in_buffer_size = 2 * avctx->channels * frame->nb_samples;
318  in_buffer_element_size = 2;
319 
320  in_args.numInSamples = avctx->channels * frame->nb_samples;
321  in_buf.numBufs = 1;
322  in_buf.bufs = &in_ptr;
323  in_buf.bufferIdentifiers = &in_buffer_identifier;
324  in_buf.bufSizes = &in_buffer_size;
325  in_buf.bufElSizes = &in_buffer_element_size;
326 
327  /* add current frame to the queue */
328  if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
329  return ret;
330  }
331 
332  /* The maximum packet size is 6144 bits aka 768 bytes per channel. */
333  if ((ret = ff_alloc_packet2(avctx, avpkt, FFMAX(8192, 768 * avctx->channels))) < 0)
334  return ret;
335 
336  out_ptr = avpkt->data;
337  out_buffer_size = avpkt->size;
338  out_buffer_element_size = 1;
339  out_buf.numBufs = 1;
340  out_buf.bufs = &out_ptr;
341  out_buf.bufferIdentifiers = &out_buffer_identifier;
342  out_buf.bufSizes = &out_buffer_size;
343  out_buf.bufElSizes = &out_buffer_element_size;
344 
345  if ((err = aacEncEncode(s->handle, &in_buf, &out_buf, &in_args,
346  &out_args)) != AACENC_OK) {
347  if (!frame && err == AACENC_ENCODE_EOF)
348  return 0;
349  av_log(avctx, AV_LOG_ERROR, "Unable to encode frame: %s\n",
350  aac_get_error(err));
351  return AVERROR(EINVAL);
352  }
353 
354  if (!out_args.numOutBytes)
355  return 0;
356 
357  /* Get the next frame pts & duration */
358  ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
359  &avpkt->duration);
360 
361  avpkt->size = out_args.numOutBytes;
362  *got_packet_ptr = 1;
363  return 0;
364 }
365 
366 static const AVProfile profiles[] = {
367  { FF_PROFILE_AAC_LOW, "LC" },
368  { FF_PROFILE_AAC_HE, "HE-AAC" },
369  { FF_PROFILE_AAC_HE_V2, "HE-AACv2" },
370  { FF_PROFILE_AAC_LD, "LD" },
371  { FF_PROFILE_AAC_ELD, "ELD" },
372  { FF_PROFILE_UNKNOWN },
373 };
374 
376  { "b", "0" },
377  { NULL }
378 };
379 
380 static const uint64_t aac_channel_layout[] = {
387  0,
388 };
389 
390 static const int aac_sample_rates[] = {
391  96000, 88200, 64000, 48000, 44100, 32000,
392  24000, 22050, 16000, 12000, 11025, 8000, 0
393 };
394 
396  .name = "libfdk_aac",
397  .type = AVMEDIA_TYPE_AUDIO,
398  .id = AV_CODEC_ID_AAC,
399  .priv_data_size = sizeof(AACContext),
401  .encode2 = aac_encode_frame,
404  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
406  .long_name = NULL_IF_CONFIG_SMALL("Fraunhofer FDK AAC"),
407  .priv_class = &aac_enc_class,
408  .defaults = aac_encode_defaults,
409  .profiles = profiles,
410  .supported_samplerates = aac_sample_rates,
411  .channel_layouts = aac_channel_layout,
412 };