FFmpeg: libavcodec/libvorbisenc.c Source File

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libvorbisenc.c

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1 /*

3 *

4 * This file is part of FFmpeg.

5 *

6 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software

18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

19 */

21 #include <vorbis/vorbisenc.h>

23 #include "libavutil/avassert.h"

24 #include "libavutil/fifo.h"

25 #include "libavutil/opt.h"

26 #include "avcodec.h"

27 #include "audio_frame_queue.h"

28 #include "internal.h"

29 #include "vorbis.h"

30 #include "vorbis_parser.h"

33 /* Number of samples the user should send in each call.

34 * This value is used because it is the LCD of all possible frame sizes, so

35 * an output packet will always start at the same point as one of the input

36 * packets.

37 */

38 #define OGGVORBIS_FRAME_SIZE 64

40 #define BUFFER_SIZE (1024 * 64)

42 typedef struct OggVorbisEncContext {

43 AVClass *av_class; /**< class for AVOptions */

44 vorbis_info vi; /**< vorbis_info used during init */

45 vorbis_dsp_state vd; /**< DSP state used for analysis */

46 vorbis_block vb; /**< vorbis_block used for analysis */

47 AVFifoBuffer *pkt_fifo; /**< output packet buffer */

48 int eof; /**< end-of-file flag */

49 int dsp_initialized; /**< vd has been initialized */

50 vorbis_comment vc; /**< VorbisComment info */

51 double iblock; /**< impulse block bias option */

52 VorbisParseContext vp; /**< parse context to get durations */

53 AudioFrameQueue afq; /**< frame queue for timestamps */

54 } OggVorbisEncContext;

56 static const AVOption options[] = {

57 { "iblock", "Sets the impulse block bias", offsetof(OggVorbisEncContext, iblock), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, -15, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },

58 { NULL }

59 };

61 static const AVCodecDefault defaults[] = {

62 { "b", "0" },

63 { NULL },

64 };

66 static const AVClass vorbis_class = {

67 .class_name = "libvorbis",

68 .item_name = av_default_item_name,

69 .option = options,

70 .version = LIBAVUTIL_VERSION_INT,

71 };

73 static int vorbis_error_to_averror(int ov_err)

74 {

75 switch (ov_err) {

76 case OV_EFAULT: return AVERROR_BUG;

77 case OV_EINVAL: return AVERROR(EINVAL);

78 case OV_EIMPL: return AVERROR(EINVAL);

79 default: return AVERROR_UNKNOWN;

80 }

81 }

83 static av_cold int oggvorbis_init_encoder(vorbis_info *vi,

84 AVCodecContext *avctx)

85 {

86 OggVorbisEncContext *s = avctx->priv_data;

87 double cfreq;

88 int ret;

90 if (avctx->flags & CODEC_FLAG_QSCALE || !avctx->bit_rate) {

91 /* variable bitrate

92 * NOTE: we use the oggenc range of -1 to 10 for global_quality for

93 * user convenience, but libvorbis uses -0.1 to 1.0.

94 */

95 float q = avctx->global_quality / (float)FF_QP2LAMBDA;

96 /* default to 3 if the user did not set quality or bitrate */

97 if (!(avctx->flags & CODEC_FLAG_QSCALE))

98 q = 3.0;

99 if ((ret = vorbis_encode_setup_vbr(vi, avctx->channels,

100 avctx->sample_rate,

101 q / 10.0)))

102 goto error;

103 } else {

104 int minrate = avctx->rc_min_rate > 0 ? avctx->rc_min_rate : -1;

105 int maxrate = avctx->rc_max_rate > 0 ? avctx->rc_max_rate : -1;

106

107 /* average bitrate */

108 if ((ret = vorbis_encode_setup_managed(vi, avctx->channels,

109 avctx->sample_rate, maxrate,

110 avctx->bit_rate, minrate)))

111 goto error;

112

113 /* variable bitrate by estimate, disable slow rate management */

114 if (minrate == -1 && maxrate == -1)

115 if ((ret = vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE2_SET, NULL)))

116 goto error; /* should not happen */

117 }

118

119 /* cutoff frequency */

120 if (avctx->cutoff > 0) {

121 cfreq = avctx->cutoff / 1000.0;

122 if ((ret = vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq)))

123 goto error; /* should not happen */

124 }

125

126 /* impulse block bias */

127 if (s->iblock) {

128 if ((ret = vorbis_encode_ctl(vi, OV_ECTL_IBLOCK_SET, &s->iblock)))

129 goto error;

130 }

131

132 if (avctx->channels == 3 &&

133 avctx->channel_layout != (AV_CH_LAYOUT_STEREO|AV_CH_FRONT_CENTER) ||

134 avctx->channels == 4 &&

135 avctx->channel_layout != AV_CH_LAYOUT_2_2 &&

136 avctx->channel_layout != AV_CH_LAYOUT_QUAD ||

137 avctx->channels == 5 &&

138 avctx->channel_layout != AV_CH_LAYOUT_5POINT0 &&

139 avctx->channel_layout != AV_CH_LAYOUT_5POINT0_BACK ||

140 avctx->channels == 6 &&

141 avctx->channel_layout != AV_CH_LAYOUT_5POINT1 &&

142 avctx->channel_layout != AV_CH_LAYOUT_5POINT1_BACK ||

143 avctx->channels == 7 &&

144 avctx->channel_layout != (AV_CH_LAYOUT_5POINT1|AV_CH_BACK_CENTER) ||

145 avctx->channels == 8 &&

146 avctx->channel_layout != AV_CH_LAYOUT_7POINT1) {

147 if (avctx->channel_layout) {

148 char name[32];

149 av_get_channel_layout_string(name, sizeof(name), avctx->channels,

150 avctx->channel_layout);

151 av_log(avctx, AV_LOG_ERROR, "%s not supported by Vorbis: "

152 "output stream will have incorrect "

153 "channel layout.\n", name);

154 } else {

155 av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The encoder "

156 "will use Vorbis channel layout for "

157 "%d channels.\n", avctx->channels);

158 }

159 }

160

161 if ((ret = vorbis_encode_setup_init(vi)))

162 goto error;

163

164 return 0;

165 error:

166 return vorbis_error_to_averror(ret);

167 }

168

169 /* How many bytes are needed for a buffer of length 'l' */

170 static int xiph_len(int l)

171 {

172 return 1 + l / 255 + l;

173 }

174

175 static av_cold int oggvorbis_encode_close(AVCodecContext *avctx)

176 {

177 OggVorbisEncContext *s = avctx->priv_data;

178

179 /* notify vorbisenc this is EOF */

180 if (s->dsp_initialized)

181 vorbis_analysis_wrote(&s->vd, 0);

182

183 vorbis_block_clear(&s->vb);

184 vorbis_dsp_clear(&s->vd);

185 vorbis_info_clear(&s->vi);

186

187 av_fifo_free(s->pkt_fifo);

188 ff_af_queue_close(&s->afq);

189 av_freep(&avctx->extradata);

190

191 return 0;

192 }

193

194 static av_cold int oggvorbis_encode_init(AVCodecContext *avctx)

195 {

196 OggVorbisEncContext *s = avctx->priv_data;

197 ogg_packet header, header_comm, header_code;

198 uint8_t *p;

199 unsigned int offset;

200 int ret;

201

202 vorbis_info_init(&s->vi);

203 if ((ret = oggvorbis_init_encoder(&s->vi, avctx))) {

204 av_log(avctx, AV_LOG_ERROR, "encoder setup failed\n");

205 goto error;

206 }

207 if ((ret = vorbis_analysis_init(&s->vd, &s->vi))) {

208 av_log(avctx, AV_LOG_ERROR, "analysis init failed\n");

209 ret = vorbis_error_to_averror(ret);

210 goto error;

211 }

212 s->dsp_initialized = 1;

213 if ((ret = vorbis_block_init(&s->vd, &s->vb))) {

214 av_log(avctx, AV_LOG_ERROR, "dsp init failed\n");

215 ret = vorbis_error_to_averror(ret);

216 goto error;

217 }

218

219 vorbis_comment_init(&s->vc);

220 if (!(avctx->flags & CODEC_FLAG_BITEXACT))

221 vorbis_comment_add_tag(&s->vc, "encoder", LIBAVCODEC_IDENT);

222

223 if ((ret = vorbis_analysis_headerout(&s->vd, &s->vc, &header, &header_comm,

224 &header_code))) {

225 ret = vorbis_error_to_averror(ret);

226 goto error;

227 }

228

229 avctx->extradata_size = 1 + xiph_len(header.bytes) +

230 xiph_len(header_comm.bytes) +

231 header_code.bytes;

232 p = avctx->extradata = av_malloc(avctx->extradata_size +

233 FF_INPUT_BUFFER_PADDING_SIZE);

234 if (!p) {

235 ret = AVERROR(ENOMEM);

236 goto error;

237 }

238 p[0] = 2;

239 offset = 1;

240 offset += av_xiphlacing(&p[offset], header.bytes);

241 offset += av_xiphlacing(&p[offset], header_comm.bytes);

242 memcpy(&p[offset], header.packet, header.bytes);

243 offset += header.bytes;

244 memcpy(&p[offset], header_comm.packet, header_comm.bytes);

245 offset += header_comm.bytes;

246 memcpy(&p[offset], header_code.packet, header_code.bytes);

247 offset += header_code.bytes;

248 av_assert0(offset == avctx->extradata_size);

249

250 if ((ret = avpriv_vorbis_parse_extradata(avctx, &s->vp)) < 0) {

251 av_log(avctx, AV_LOG_ERROR, "invalid extradata\n");

252 return ret;

253 }

254

255 vorbis_comment_clear(&s->vc);

256

257 avctx->frame_size = OGGVORBIS_FRAME_SIZE;

258 ff_af_queue_init(avctx, &s->afq);

259

260 s->pkt_fifo = av_fifo_alloc(BUFFER_SIZE);

261 if (!s->pkt_fifo) {

262 ret = AVERROR(ENOMEM);

263 goto error;

264 }

265

266 return 0;

267 error:

268 oggvorbis_encode_close(avctx);

269 return ret;

270 }

271

272 static int oggvorbis_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,

273 const AVFrame *frame, int *got_packet_ptr)

274 {

275 OggVorbisEncContext *s = avctx->priv_data;

276 ogg_packet op;

277 int ret, duration;

278

279 /* send samples to libvorbis */

280 if (frame) {

281 const int samples = frame->nb_samples;

282 float **buffer;

283 int c, channels = s->vi.channels;

284

285 buffer = vorbis_analysis_buffer(&s->vd, samples);

286 for (c = 0; c < channels; c++) {

287 int co = (channels > 8) ? c :

288 ff_vorbis_encoding_channel_layout_offsets[channels - 1][c];

289 memcpy(buffer[c], frame->extended_data[co],

290 samples * sizeof(*buffer[c]));

291 }

292 if ((ret = vorbis_analysis_wrote(&s->vd, samples)) < 0) {

293 av_log(avctx, AV_LOG_ERROR, "error in vorbis_analysis_wrote()\n");

294 return vorbis_error_to_averror(ret);

295 }

296 if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)

297 return ret;

298 } else {

299 if (!s->eof)

300 if ((ret = vorbis_analysis_wrote(&s->vd, 0)) < 0) {

301 av_log(avctx, AV_LOG_ERROR, "error in vorbis_analysis_wrote()\n");

302 return vorbis_error_to_averror(ret);

303 }

304 s->eof = 1;

305 }

306

307 /* retrieve available packets from libvorbis */

308 while ((ret = vorbis_analysis_blockout(&s->vd, &s->vb)) == 1) {

309 if ((ret = vorbis_analysis(&s->vb, NULL)) < 0)

310 break;

311 if ((ret = vorbis_bitrate_addblock(&s->vb)) < 0)

312 break;

313

314 /* add any available packets to the output packet buffer */

315 while ((ret = vorbis_bitrate_flushpacket(&s->vd, &op)) == 1) {

316 if (av_fifo_space(s->pkt_fifo) < sizeof(ogg_packet) + op.bytes) {

317 av_log(avctx, AV_LOG_ERROR, "packet buffer is too small\n");

318 return AVERROR_BUG;

319 }

320 av_fifo_generic_write(s->pkt_fifo, &op, sizeof(ogg_packet), NULL);

321 av_fifo_generic_write(s->pkt_fifo, op.packet, op.bytes, NULL);

322 }

323 if (ret < 0) {

324 av_log(avctx, AV_LOG_ERROR, "error getting available packets\n");

325 break;

326 }

327 }

328 if (ret < 0) {

329 av_log(avctx, AV_LOG_ERROR, "error getting available packets\n");

330 return vorbis_error_to_averror(ret);

331 }

332

333 /* check for available packets */

334 if (av_fifo_size(s->pkt_fifo) < sizeof(ogg_packet))

335 return 0;

336

337 av_fifo_generic_read(s->pkt_fifo, &op, sizeof(ogg_packet), NULL);

338

339 if ((ret = ff_alloc_packet2(avctx, avpkt, op.bytes)) < 0)

340 return ret;

341 av_fifo_generic_read(s->pkt_fifo, avpkt->data, op.bytes, NULL);

342

343 avpkt->pts = ff_samples_to_time_base(avctx, op.granulepos);

344

345 duration = avpriv_vorbis_parse_frame(&s->vp, avpkt->data, avpkt->size);

346 if (duration > 0) {

347 /* we do not know encoder delay until we get the first packet from

348 * libvorbis, so we have to update the AudioFrameQueue counts */

349 if (!avctx->delay && s->afq.frames) {

350 avctx->delay = duration;

351 av_assert0(!s->afq.remaining_delay);

352 s->afq.frames->duration += duration;

353 s->afq.frames->pts -= duration;

354 s->afq.remaining_samples += duration;

355 }

356 ff_af_queue_remove(&s->afq, duration, &avpkt->pts, &avpkt->duration);

357 }

358

359 *got_packet_ptr = 1;

360 return 0;

361 }

362

363 AVCodec ff_libvorbis_encoder = {

364 .name = "libvorbis",

365 .long_name = NULL_IF_CONFIG_SMALL("libvorbis"),

366 .type = AVMEDIA_TYPE_AUDIO,

367 .id = AV_CODEC_ID_VORBIS,

368 .priv_data_size = sizeof(OggVorbisEncContext),

369 .init = oggvorbis_encode_init,

370 .encode2 = oggvorbis_encode_frame,

371 .close = oggvorbis_encode_close,

372 .capabilities = CODEC_CAP_DELAY,

373 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,

374 AV_SAMPLE_FMT_NONE },

375 .priv_class = &vorbis_class,

376 .defaults = defaults,

377 };

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