3 * Ogg Vorbis codec support via libvorbisenc.
4 * @author Mark Hills <mark@pogo.org.uk>
7 #include <vorbis/vorbisenc.h>
14 #define OGGVORBIS_FRAME_SIZE 64
16 #define BUFFER_SIZE (1024*64)
18 typedef struct OggVorbisContext {
22 uint8_t buffer[BUFFER_SIZE];
31 static int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext) {
34 if(avccontext->flags & CODEC_FLAG_QSCALE) {
35 /* variable bitrate */
36 if(vorbis_encode_setup_vbr(vi, avccontext->channels,
37 avccontext->sample_rate,
38 avccontext->global_quality / (float)FF_QP2LAMBDA))
41 /* constant bitrate */
42 if(vorbis_encode_setup_managed(vi, avccontext->channels,
43 avccontext->sample_rate, -1, avccontext->bit_rate, -1))
46 #ifdef OGGVORBIS_VBR_BY_ESTIMATE
47 /* variable bitrate by estimate */
48 if(vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE_AVG, NULL))
53 /* cutoff frequency */
54 if(avccontext->cutoff > 0) {
55 cfreq = avccontext->cutoff / 1000.0;
56 if(vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq))
60 return vorbis_encode_setup_init(vi);
63 static int oggvorbis_encode_init(AVCodecContext *avccontext) {
64 OggVorbisContext *context = avccontext->priv_data ;
65 ogg_packet header, header_comm, header_code;
67 unsigned int offset, len;
69 vorbis_info_init(&context->vi) ;
70 if(oggvorbis_init_encoder(&context->vi, avccontext) < 0) {
71 av_log(avccontext, AV_LOG_ERROR, "oggvorbis_encode_init: init_encoder failed") ;
74 vorbis_analysis_init(&context->vd, &context->vi) ;
75 vorbis_block_init(&context->vd, &context->vb) ;
77 vorbis_comment_init(&context->vc);
78 vorbis_comment_add_tag(&context->vc, "encoder", LIBAVCODEC_IDENT) ;
80 vorbis_analysis_headerout(&context->vd, &context->vc, &header,
81 &header_comm, &header_code);
83 len = header.bytes + header_comm.bytes + header_code.bytes;
84 avccontext->extradata_size= 64 + len + len/255;
85 p = avccontext->extradata= av_mallocz(avccontext->extradata_size);
88 offset += av_xiphlacing(&p[offset], header.bytes);
89 offset += av_xiphlacing(&p[offset], header_comm.bytes);
90 memcpy(&p[offset], header.packet, header.bytes);
91 offset += header.bytes;
92 memcpy(&p[offset], header_comm.packet, header_comm.bytes);
93 offset += header_comm.bytes;
94 memcpy(&p[offset], header_code.packet, header_code.bytes);
95 offset += header_code.bytes;
96 avccontext->extradata_size = offset;
97 avccontext->extradata= av_realloc(avccontext->extradata, avccontext->extradata_size);
99 /* vorbis_block_clear(&context->vb);
100 vorbis_dsp_clear(&context->vd);
101 vorbis_info_clear(&context->vi);*/
102 vorbis_comment_clear(&context->vc);
104 avccontext->frame_size = OGGVORBIS_FRAME_SIZE ;
106 avccontext->coded_frame= avcodec_alloc_frame();
107 avccontext->coded_frame->key_frame= 1;
113 static int oggvorbis_encode_frame(AVCodecContext *avccontext,
114 unsigned char *packets,
115 int buf_size, void *data)
117 OggVorbisContext *context = avccontext->priv_data ;
120 signed short *audio = data ;
121 int l, samples = data ? OGGVORBIS_FRAME_SIZE : 0;
123 buffer = vorbis_analysis_buffer(&context->vd, samples) ;
125 if(context->vi.channels == 1) {
126 for(l = 0 ; l < samples ; l++)
127 buffer[0][l]=audio[l]/32768.f;
129 for(l = 0 ; l < samples ; l++){
130 buffer[0][l]=audio[l*2]/32768.f;
131 buffer[1][l]=audio[l*2+1]/32768.f;
135 vorbis_analysis_wrote(&context->vd, samples) ;
137 while(vorbis_analysis_blockout(&context->vd, &context->vb) == 1) {
138 vorbis_analysis(&context->vb, NULL);
139 vorbis_bitrate_addblock(&context->vb) ;
141 while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
142 if(op.bytes==1) //id love to say this is a hack, bad sadly its not, appearently the end of stream decission is in libogg
144 memcpy(context->buffer + context->buffer_index, &op, sizeof(ogg_packet));
145 context->buffer_index += sizeof(ogg_packet);
146 memcpy(context->buffer + context->buffer_index, op.packet, op.bytes);
147 context->buffer_index += op.bytes;
148 // av_log(avccontext, AV_LOG_DEBUG, "e%d / %d\n", context->buffer_index, op.bytes);
153 if(context->buffer_index){
154 ogg_packet *op2= (ogg_packet*)context->buffer;
155 op2->packet = context->buffer + sizeof(ogg_packet);
158 avccontext->coded_frame->pts= av_rescale_q(op2->granulepos, (AVRational){1, avccontext->sample_rate}, avccontext->time_base);
159 //FIXME we should reorder the user supplied pts and not assume that they are spaced by 1/sample_rate
161 memcpy(packets, op2->packet, l);
162 context->buffer_index -= l + sizeof(ogg_packet);
163 memcpy(context->buffer, context->buffer + l + sizeof(ogg_packet), context->buffer_index);
164 // av_log(avccontext, AV_LOG_DEBUG, "E%d\n", l);
171 static int oggvorbis_encode_close(AVCodecContext *avccontext) {
172 OggVorbisContext *context = avccontext->priv_data ;
173 /* ogg_packet op ; */
175 vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
177 vorbis_block_clear(&context->vb);
178 vorbis_dsp_clear(&context->vd);
179 vorbis_info_clear(&context->vi);
181 av_freep(&avccontext->coded_frame);
182 av_freep(&avccontext->extradata);
188 AVCodec oggvorbis_encoder = {
192 sizeof(OggVorbisContext),
193 oggvorbis_encode_init,
194 oggvorbis_encode_frame,
195 oggvorbis_encode_close,
196 .capabilities= CODEC_CAP_DELAY,
199 static int oggvorbis_decode_init(AVCodecContext *avccontext) {
200 OggVorbisContext *context = avccontext->priv_data ;
201 uint8_t *p= avccontext->extradata;
203 unsigned char *headers[3], *extradata = avccontext->extradata;
205 vorbis_info_init(&context->vi) ;
206 vorbis_comment_init(&context->vc) ;
208 if(! avccontext->extradata_size || ! p) {
209 av_log(avccontext, AV_LOG_ERROR, "vorbis extradata absent\n");
213 if(p[0] == 0 && p[1] == 30) {
214 for(i = 0; i < 3; i++){
215 hsizes[i] = *p++ << 8;
221 unsigned int offset = 1;
225 while((*p == 0xFF) && (offset < avccontext->extradata_size)) {
230 if(offset >= avccontext->extradata_size - 1) {
231 av_log(avccontext, AV_LOG_ERROR,
232 "vorbis header sizes damaged\n");
239 hsizes[2] = avccontext->extradata_size - hsizes[0]-hsizes[1]-offset;
241 av_log(avccontext, AV_LOG_DEBUG,
242 "vorbis header sizes: %d, %d, %d, / extradata_len is %d \n",
243 hsizes[0], hsizes[1], hsizes[2], avccontext->extradata_size);
245 headers[0] = extradata + offset;
246 headers[1] = extradata + offset + hsizes[0];
247 headers[2] = extradata + offset + hsizes[0] + hsizes[1];
249 av_log(avccontext, AV_LOG_ERROR,
250 "vorbis initial header len is wrong: %d\n", *p);
255 context->op.b_o_s= i==0;
256 context->op.bytes = hsizes[i];
257 context->op.packet = headers[i];
258 if(vorbis_synthesis_headerin(&context->vi, &context->vc, &context->op)<0){
259 av_log(avccontext, AV_LOG_ERROR, "%d. vorbis header damaged\n", i+1);
264 avccontext->channels = context->vi.channels;
265 avccontext->sample_rate = context->vi.rate;
266 avccontext->time_base= (AVRational){1, avccontext->sample_rate};
268 vorbis_synthesis_init(&context->vd, &context->vi);
269 vorbis_block_init(&context->vd, &context->vb);
275 static inline int conv(int samples, float **pcm, char *buf, int channels) {
277 ogg_int16_t *ptr, *data = (ogg_int16_t*)buf ;
280 for(i = 0 ; i < channels ; i++){
284 for(j = 0 ; j < samples ; j++) {
286 val = mono[j] * 32767.f;
288 if(val > 32767) val = 32767 ;
289 if(val < -32768) val = -32768 ;
300 static int oggvorbis_decode_frame(AVCodecContext *avccontext,
301 void *data, int *data_size,
302 uint8_t *buf, int buf_size)
304 OggVorbisContext *context = avccontext->priv_data ;
306 ogg_packet *op= &context->op;
307 int samples, total_samples, total_bytes;
315 op->bytes = buf_size;
317 // av_log(avccontext, AV_LOG_DEBUG, "%d %d %d %lld %lld %d %d\n", op->bytes, op->b_o_s, op->e_o_s, op->granulepos, op->packetno, buf_size, context->vi.rate);
319 /* for(i=0; i<op->bytes; i++)
320 av_log(avccontext, AV_LOG_DEBUG, "%02X ", op->packet[i]);
321 av_log(avccontext, AV_LOG_DEBUG, "\n");*/
323 if(vorbis_synthesis(&context->vb, op) == 0)
324 vorbis_synthesis_blockin(&context->vd, &context->vb) ;
329 while((samples = vorbis_synthesis_pcmout(&context->vd, &pcm)) > 0) {
330 conv(samples, pcm, (char*)data + total_bytes, context->vi.channels) ;
331 total_bytes += samples * 2 * context->vi.channels ;
332 total_samples += samples ;
333 vorbis_synthesis_read(&context->vd, samples) ;
336 *data_size = total_bytes ;
341 static int oggvorbis_decode_close(AVCodecContext *avccontext) {
342 OggVorbisContext *context = avccontext->priv_data ;
344 vorbis_info_clear(&context->vi) ;
345 vorbis_comment_clear(&context->vc) ;
351 AVCodec oggvorbis_decoder = {
355 sizeof(OggVorbisContext),
356 oggvorbis_decode_init,
358 oggvorbis_decode_close,
359 oggvorbis_decode_frame,
360 .capabilities= CODEC_CAP_DELAY,