Libav
libvorbis.c
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1 /*
2  * copyright (c) 2002 Mark Hills <mark@pogo.org.uk>
3  *
4  * This file is part of Libav.
5  *
6  * Libav is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * Libav is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
27 #include <vorbis/vorbisenc.h>
28 
29 #include "libavutil/fifo.h"
30 #include "libavutil/opt.h"
31 #include "avcodec.h"
32 #include "audio_frame_queue.h"
33 #include "bytestream.h"
34 #include "internal.h"
35 #include "vorbis.h"
36 #include "vorbis_parser.h"
37 
38 #undef NDEBUG
39 #include <assert.h>
40 
41 /* Number of samples the user should send in each call.
42  * This value is used because it is the LCD of all possible frame sizes, so
43  * an output packet will always start at the same point as one of the input
44  * packets.
45  */
46 #define OGGVORBIS_FRAME_SIZE 64
47 
48 #define BUFFER_SIZE (1024 * 64)
49 
50 typedef struct OggVorbisContext {
52  vorbis_info vi;
53  vorbis_dsp_state vd;
54  vorbis_block vb;
56  int eof;
58  vorbis_comment vc;
60  double iblock;
64 
65 static const AVOption options[] = {
66  { "iblock", "Sets the impulse block bias", offsetof(OggVorbisContext, iblock), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, -15, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
67  { NULL }
68 };
69 
70 static const AVCodecDefault defaults[] = {
71  { "b", "0" },
72  { NULL },
73 };
74 
75 static const AVClass class = { "libvorbis", av_default_item_name, options, LIBAVUTIL_VERSION_INT };
76 
77 
78 static int vorbis_error_to_averror(int ov_err)
79 {
80  switch (ov_err) {
81  case OV_EFAULT: return AVERROR_BUG;
82  case OV_EINVAL: return AVERROR(EINVAL);
83  case OV_EIMPL: return AVERROR(EINVAL);
84  default: return AVERROR_UNKNOWN;
85  }
86 }
87 
88 static av_cold int oggvorbis_init_encoder(vorbis_info *vi,
89  AVCodecContext *avctx)
90 {
91  OggVorbisContext *s = avctx->priv_data;
92  double cfreq;
93  int ret;
94 
95  if (avctx->flags & CODEC_FLAG_QSCALE || !avctx->bit_rate) {
96  /* variable bitrate
97  * NOTE: we use the oggenc range of -1 to 10 for global_quality for
98  * user convenience, but libvorbis uses -0.1 to 1.0.
99  */
100  float q = avctx->global_quality / (float)FF_QP2LAMBDA;
101  /* default to 3 if the user did not set quality or bitrate */
102  if (!(avctx->flags & CODEC_FLAG_QSCALE))
103  q = 3.0;
104  if ((ret = vorbis_encode_setup_vbr(vi, avctx->channels,
105  avctx->sample_rate,
106  q / 10.0)))
107  goto error;
108  } else {
109  int minrate = avctx->rc_min_rate > 0 ? avctx->rc_min_rate : -1;
110  int maxrate = avctx->rc_max_rate > 0 ? avctx->rc_max_rate : -1;
111 
112  /* average bitrate */
113  if ((ret = vorbis_encode_setup_managed(vi, avctx->channels,
114  avctx->sample_rate, maxrate,
115  avctx->bit_rate, minrate)))
116  goto error;
117 
118  /* variable bitrate by estimate, disable slow rate management */
119  if (minrate == -1 && maxrate == -1)
120  if ((ret = vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE2_SET, NULL)))
121  goto error;
122  }
123 
124  /* cutoff frequency */
125  if (avctx->cutoff > 0) {
126  cfreq = avctx->cutoff / 1000.0;
127  if ((ret = vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq)))
128  goto error;
129  }
130 
131  /* impulse block bias */
132  if (s->iblock) {
133  if ((ret = vorbis_encode_ctl(vi, OV_ECTL_IBLOCK_SET, &s->iblock)))
134  goto error;
135  }
136 
137  if ((ret = vorbis_encode_setup_init(vi)))
138  goto error;
139 
140  return 0;
141 error:
142  return vorbis_error_to_averror(ret);
143 }
144 
145 /* How many bytes are needed for a buffer of length 'l' */
146 static int xiph_len(int l)
147 {
148  return 1 + l / 255 + l;
149 }
150 
152 {
153  OggVorbisContext *s = avctx->priv_data;
154 
155  /* notify vorbisenc this is EOF */
156  if (s->dsp_initialized)
157  vorbis_analysis_wrote(&s->vd, 0);
158 
159  vorbis_block_clear(&s->vb);
160  vorbis_dsp_clear(&s->vd);
161  vorbis_info_clear(&s->vi);
162 
164  ff_af_queue_close(&s->afq);
165  av_freep(&avctx->extradata);
166 
167  return 0;
168 }
169 
171 {
172  OggVorbisContext *s = avctx->priv_data;
173  ogg_packet header, header_comm, header_code;
174  uint8_t *p;
175  unsigned int offset;
176  int ret;
177 
178  vorbis_info_init(&s->vi);
179  if ((ret = oggvorbis_init_encoder(&s->vi, avctx))) {
180  av_log(avctx, AV_LOG_ERROR, "encoder setup failed\n");
181  goto error;
182  }
183  if ((ret = vorbis_analysis_init(&s->vd, &s->vi))) {
184  av_log(avctx, AV_LOG_ERROR, "analysis init failed\n");
185  ret = vorbis_error_to_averror(ret);
186  goto error;
187  }
188  s->dsp_initialized = 1;
189  if ((ret = vorbis_block_init(&s->vd, &s->vb))) {
190  av_log(avctx, AV_LOG_ERROR, "dsp init failed\n");
191  ret = vorbis_error_to_averror(ret);
192  goto error;
193  }
194 
195  vorbis_comment_init(&s->vc);
196  vorbis_comment_add_tag(&s->vc, "encoder", LIBAVCODEC_IDENT);
197 
198  if ((ret = vorbis_analysis_headerout(&s->vd, &s->vc, &header, &header_comm,
199  &header_code))) {
200  ret = vorbis_error_to_averror(ret);
201  goto error;
202  }
203 
204  avctx->extradata_size = 1 + xiph_len(header.bytes) +
205  xiph_len(header_comm.bytes) +
206  header_code.bytes;
207  p = avctx->extradata = av_malloc(avctx->extradata_size +
209  if (!p) {
210  ret = AVERROR(ENOMEM);
211  goto error;
212  }
213  p[0] = 2;
214  offset = 1;
215  offset += av_xiphlacing(&p[offset], header.bytes);
216  offset += av_xiphlacing(&p[offset], header_comm.bytes);
217  memcpy(&p[offset], header.packet, header.bytes);
218  offset += header.bytes;
219  memcpy(&p[offset], header_comm.packet, header_comm.bytes);
220  offset += header_comm.bytes;
221  memcpy(&p[offset], header_code.packet, header_code.bytes);
222  offset += header_code.bytes;
223  assert(offset == avctx->extradata_size);
224 
225  if ((ret = avpriv_vorbis_parse_extradata(avctx, &s->vp)) < 0) {
226  av_log(avctx, AV_LOG_ERROR, "invalid extradata\n");
227  return ret;
228  }
229 
230  vorbis_comment_clear(&s->vc);
231 
233  ff_af_queue_init(avctx, &s->afq);
234 
236  if (!s->pkt_fifo) {
237  ret = AVERROR(ENOMEM);
238  goto error;
239  }
240 
241  return 0;
242 error:
243  oggvorbis_encode_close(avctx);
244  return ret;
245 }
246 
248  const AVFrame *frame, int *got_packet_ptr)
249 {
250  OggVorbisContext *s = avctx->priv_data;
251  ogg_packet op;
252  int ret, duration;
253 
254  /* send samples to libvorbis */
255  if (frame) {
256  const int samples = frame->nb_samples;
257  float **buffer;
258  int c, channels = s->vi.channels;
259 
260  buffer = vorbis_analysis_buffer(&s->vd, samples);
261  for (c = 0; c < channels; c++) {
262  int co = (channels > 8) ? c :
264  memcpy(buffer[c], frame->extended_data[co],
265  samples * sizeof(*buffer[c]));
266  }
267  if ((ret = vorbis_analysis_wrote(&s->vd, samples)) < 0) {
268  av_log(avctx, AV_LOG_ERROR, "error in vorbis_analysis_wrote()\n");
269  return vorbis_error_to_averror(ret);
270  }
271  if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
272  return ret;
273  } else {
274  if (!s->eof)
275  if ((ret = vorbis_analysis_wrote(&s->vd, 0)) < 0) {
276  av_log(avctx, AV_LOG_ERROR, "error in vorbis_analysis_wrote()\n");
277  return vorbis_error_to_averror(ret);
278  }
279  s->eof = 1;
280  }
281 
282  /* retrieve available packets from libvorbis */
283  while ((ret = vorbis_analysis_blockout(&s->vd, &s->vb)) == 1) {
284  if ((ret = vorbis_analysis(&s->vb, NULL)) < 0)
285  break;
286  if ((ret = vorbis_bitrate_addblock(&s->vb)) < 0)
287  break;
288 
289  /* add any available packets to the output packet buffer */
290  while ((ret = vorbis_bitrate_flushpacket(&s->vd, &op)) == 1) {
291  if (av_fifo_space(s->pkt_fifo) < sizeof(ogg_packet) + op.bytes) {
292  av_log(avctx, AV_LOG_ERROR, "packet buffer is too small");
293  return AVERROR_BUG;
294  }
295  av_fifo_generic_write(s->pkt_fifo, &op, sizeof(ogg_packet), NULL);
296  av_fifo_generic_write(s->pkt_fifo, op.packet, op.bytes, NULL);
297  }
298  if (ret < 0) {
299  av_log(avctx, AV_LOG_ERROR, "error getting available packets\n");
300  break;
301  }
302  }
303  if (ret < 0) {
304  av_log(avctx, AV_LOG_ERROR, "error getting available packets\n");
305  return vorbis_error_to_averror(ret);
306  }
307 
308  /* check for available packets */
309  if (av_fifo_size(s->pkt_fifo) < sizeof(ogg_packet))
310  return 0;
311 
312  av_fifo_generic_read(s->pkt_fifo, &op, sizeof(ogg_packet), NULL);
313 
314  if ((ret = ff_alloc_packet(avpkt, op.bytes))) {
315  av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
316  return ret;
317  }
318  av_fifo_generic_read(s->pkt_fifo, avpkt->data, op.bytes, NULL);
319 
320  avpkt->pts = ff_samples_to_time_base(avctx, op.granulepos);
321 
322  duration = avpriv_vorbis_parse_frame(&s->vp, avpkt->data, avpkt->size);
323  if (duration > 0) {
324  /* we do not know encoder delay until we get the first packet from
325  * libvorbis, so we have to update the AudioFrameQueue counts */
326  if (!avctx->delay) {
327  avctx->delay = duration;
330  }
331  ff_af_queue_remove(&s->afq, duration, &avpkt->pts, &avpkt->duration);
332  }
333 
334  *got_packet_ptr = 1;
335  return 0;
336 }
337 
339  .name = "libvorbis",
340  .long_name = NULL_IF_CONFIG_SMALL("libvorbis Vorbis"),
341  .type = AVMEDIA_TYPE_AUDIO,
342  .id = AV_CODEC_ID_VORBIS,
343  .priv_data_size = sizeof(OggVorbisContext),
345  .encode2 = oggvorbis_encode_frame,
347  .capabilities = CODEC_CAP_DELAY,
348  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
350  .priv_class = &class,
351  .defaults = defaults,
352 };