6b98e2f879fbfac185d6e9d0d01ed3d4d02438c2
[libav.git] / libavcodec / libvorbis.c
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
21 /**
22 * @file
23 * Ogg Vorbis codec support via libvorbisenc.
24 * @author Mark Hills <mark@pogo.org.uk>
25 */
26
27 #include <vorbis/vorbisenc.h>
28
29 #include "libavutil/opt.h"
30 #include "avcodec.h"
31 #include "bytestream.h"
32 #include "vorbis.h"
33 #include "libavutil/mathematics.h"
34
35 #undef NDEBUG
36 #include <assert.h>
37
38 #define OGGVORBIS_FRAME_SIZE 64
39
40 #define BUFFER_SIZE (1024*64)
41
42 typedef struct OggVorbisContext {
43 AVClass *av_class;
44 vorbis_info vi ;
45 vorbis_dsp_state vd ;
46 vorbis_block vb ;
47 uint8_t buffer[BUFFER_SIZE];
48 int buffer_index;
49 int eof;
50
51 /* decoder */
52 vorbis_comment vc ;
53 ogg_packet op;
54
55 double iblock;
56 } OggVorbisContext ;
57
58 static const AVOption options[]={
59 {"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},
60 {NULL}
61 };
62 static const AVClass class = { "libvorbis", av_default_item_name, options, LIBAVUTIL_VERSION_INT };
63
64 static av_cold int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext) {
65 OggVorbisContext *context = avccontext->priv_data ;
66 double cfreq;
67
68 if(avccontext->flags & CODEC_FLAG_QSCALE) {
69 /* variable bitrate */
70 if(vorbis_encode_setup_vbr(vi, avccontext->channels,
71 avccontext->sample_rate,
72 avccontext->global_quality / (float)FF_QP2LAMBDA / 10.0))
73 return -1;
74 } else {
75 int minrate = avccontext->rc_min_rate > 0 ? avccontext->rc_min_rate : -1;
76 int maxrate = avccontext->rc_min_rate > 0 ? avccontext->rc_max_rate : -1;
77
78 /* constant bitrate */
79 if(vorbis_encode_setup_managed(vi, avccontext->channels,
80 avccontext->sample_rate, minrate, avccontext->bit_rate, maxrate))
81 return -1;
82
83 /* variable bitrate by estimate, disable slow rate management */
84 if(minrate == -1 && maxrate == -1)
85 if(vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE2_SET, NULL))
86 return -1;
87 }
88
89 /* cutoff frequency */
90 if(avccontext->cutoff > 0) {
91 cfreq = avccontext->cutoff / 1000.0;
92 if(vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq))
93 return -1;
94 }
95
96 if(context->iblock){
97 vorbis_encode_ctl(vi, OV_ECTL_IBLOCK_SET, &context->iblock);
98 }
99
100 return vorbis_encode_setup_init(vi);
101 }
102
103 /* How many bytes are needed for a buffer of length 'l' */
104 static int xiph_len(int l) { return (1 + l / 255 + l); }
105
106 static av_cold int oggvorbis_encode_init(AVCodecContext *avccontext) {
107 OggVorbisContext *context = avccontext->priv_data ;
108 ogg_packet header, header_comm, header_code;
109 uint8_t *p;
110 unsigned int offset;
111
112 vorbis_info_init(&context->vi) ;
113 if(oggvorbis_init_encoder(&context->vi, avccontext) < 0) {
114 av_log(avccontext, AV_LOG_ERROR, "oggvorbis_encode_init: init_encoder failed\n") ;
115 return -1 ;
116 }
117 vorbis_analysis_init(&context->vd, &context->vi) ;
118 vorbis_block_init(&context->vd, &context->vb) ;
119
120 vorbis_comment_init(&context->vc);
121 vorbis_comment_add_tag(&context->vc, "encoder", LIBAVCODEC_IDENT) ;
122
123 vorbis_analysis_headerout(&context->vd, &context->vc, &header,
124 &header_comm, &header_code);
125
126 avccontext->extradata_size=
127 1 + xiph_len(header.bytes) + xiph_len(header_comm.bytes) +
128 header_code.bytes;
129 p = avccontext->extradata =
130 av_malloc(avccontext->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
131 p[0] = 2;
132 offset = 1;
133 offset += av_xiphlacing(&p[offset], header.bytes);
134 offset += av_xiphlacing(&p[offset], header_comm.bytes);
135 memcpy(&p[offset], header.packet, header.bytes);
136 offset += header.bytes;
137 memcpy(&p[offset], header_comm.packet, header_comm.bytes);
138 offset += header_comm.bytes;
139 memcpy(&p[offset], header_code.packet, header_code.bytes);
140 offset += header_code.bytes;
141 assert(offset == avccontext->extradata_size);
142
143 /* vorbis_block_clear(&context->vb);
144 vorbis_dsp_clear(&context->vd);
145 vorbis_info_clear(&context->vi);*/
146 vorbis_comment_clear(&context->vc);
147
148 avccontext->frame_size = OGGVORBIS_FRAME_SIZE ;
149
150 avccontext->coded_frame= avcodec_alloc_frame();
151 avccontext->coded_frame->key_frame= 1;
152
153 return 0 ;
154 }
155
156
157 static int oggvorbis_encode_frame(AVCodecContext *avccontext,
158 unsigned char *packets,
159 int buf_size, void *data)
160 {
161 OggVorbisContext *context = avccontext->priv_data ;
162 ogg_packet op ;
163 signed short *audio = data ;
164 int l;
165
166 if(data) {
167 const int samples = avccontext->frame_size;
168 float **buffer ;
169 int c, channels = context->vi.channels;
170
171 buffer = vorbis_analysis_buffer(&context->vd, samples) ;
172 for (c = 0; c < channels; c++) {
173 int co = (channels > 8) ? c :
174 ff_vorbis_encoding_channel_layout_offsets[channels-1][c];
175 for(l = 0 ; l < samples ; l++)
176 buffer[c][l]=audio[l*channels+co]/32768.f;
177 }
178 vorbis_analysis_wrote(&context->vd, samples) ;
179 } else {
180 if(!context->eof)
181 vorbis_analysis_wrote(&context->vd, 0) ;
182 context->eof = 1;
183 }
184
185 while(vorbis_analysis_blockout(&context->vd, &context->vb) == 1) {
186 vorbis_analysis(&context->vb, NULL);
187 vorbis_bitrate_addblock(&context->vb) ;
188
189 while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
190 /* i'd love to say the following line is a hack, but sadly it's
191 * not, apparently the end of stream decision is in libogg. */
192 if(op.bytes==1 && op.e_o_s)
193 continue;
194 if (context->buffer_index + sizeof(ogg_packet) + op.bytes > BUFFER_SIZE) {
195 av_log(avccontext, AV_LOG_ERROR, "libvorbis: buffer overflow.");
196 return -1;
197 }
198 memcpy(context->buffer + context->buffer_index, &op, sizeof(ogg_packet));
199 context->buffer_index += sizeof(ogg_packet);
200 memcpy(context->buffer + context->buffer_index, op.packet, op.bytes);
201 context->buffer_index += op.bytes;
202 // av_log(avccontext, AV_LOG_DEBUG, "e%d / %d\n", context->buffer_index, op.bytes);
203 }
204 }
205
206 l=0;
207 if(context->buffer_index){
208 ogg_packet *op2= (ogg_packet*)context->buffer;
209 op2->packet = context->buffer + sizeof(ogg_packet);
210
211 l= op2->bytes;
212 avccontext->coded_frame->pts= av_rescale_q(op2->granulepos, (AVRational){1, avccontext->sample_rate}, avccontext->time_base);
213 //FIXME we should reorder the user supplied pts and not assume that they are spaced by 1/sample_rate
214
215 if (l > buf_size) {
216 av_log(avccontext, AV_LOG_ERROR, "libvorbis: buffer overflow.");
217 return -1;
218 }
219
220 memcpy(packets, op2->packet, l);
221 context->buffer_index -= l + sizeof(ogg_packet);
222 memmove(context->buffer, context->buffer + l + sizeof(ogg_packet), context->buffer_index);
223 // av_log(avccontext, AV_LOG_DEBUG, "E%d\n", l);
224 }
225
226 return l;
227 }
228
229
230 static av_cold int oggvorbis_encode_close(AVCodecContext *avccontext) {
231 OggVorbisContext *context = avccontext->priv_data ;
232 /* ogg_packet op ; */
233
234 vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
235
236 vorbis_block_clear(&context->vb);
237 vorbis_dsp_clear(&context->vd);
238 vorbis_info_clear(&context->vi);
239
240 av_freep(&avccontext->coded_frame);
241 av_freep(&avccontext->extradata);
242
243 return 0 ;
244 }
245
246
247 AVCodec ff_libvorbis_encoder = {
248 .name = "libvorbis",
249 .type = AVMEDIA_TYPE_AUDIO,
250 .id = CODEC_ID_VORBIS,
251 .priv_data_size = sizeof(OggVorbisContext),
252 .init = oggvorbis_encode_init,
253 .encode = oggvorbis_encode_frame,
254 .close = oggvorbis_encode_close,
255 .capabilities = CODEC_CAP_DELAY,
256 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
257 .long_name = NULL_IF_CONFIG_SMALL("libvorbis Vorbis"),
258 .priv_class = &class,
259 };