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) {
33 if(avccontext->flags & CODEC_FLAG_QSCALE) {
34 return vorbis_encode_init_vbr(vi, avccontext->channels,
35 avccontext->sample_rate,
36 avccontext->global_quality / (float)FF_QP2LAMBDA);
38 #ifdef OGGVORBIS_VBR_BY_ESTIMATE
39 /* variable bitrate by estimate */
41 return (vorbis_encode_setup_managed(vi, avccontext->channels,
42 avccontext->sample_rate, -1, avccontext->bit_rate, -1) ||
43 vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE_AVG, NULL) ||
44 vorbis_encode_setup_init(vi)) ;
46 /* constant bitrate */
48 return vorbis_encode_init(vi, avccontext->channels,
49 avccontext->sample_rate, -1, avccontext->bit_rate, -1) ;
53 static int oggvorbis_encode_init(AVCodecContext *avccontext) {
54 OggVorbisContext *context = avccontext->priv_data ;
55 ogg_packet header, header_comm, header_code;
57 unsigned int offset, len;
59 vorbis_info_init(&context->vi) ;
60 if(oggvorbis_init_encoder(&context->vi, avccontext) < 0) {
61 av_log(avccontext, AV_LOG_ERROR, "oggvorbis_encode_init: init_encoder failed") ;
64 vorbis_analysis_init(&context->vd, &context->vi) ;
65 vorbis_block_init(&context->vd, &context->vb) ;
67 vorbis_comment_init(&context->vc);
68 vorbis_comment_add_tag(&context->vc, "encoder", LIBAVCODEC_IDENT) ;
70 vorbis_analysis_headerout(&context->vd, &context->vc, &header,
71 &header_comm, &header_code);
73 len = header.bytes + header_comm.bytes + header_code.bytes;
74 avccontext->extradata_size= 64 + len + len/255;
75 p = avccontext->extradata= av_mallocz(avccontext->extradata_size);
78 offset += av_xiphlacing(&p[offset], header.bytes);
79 offset += av_xiphlacing(&p[offset], header_comm.bytes);
80 memcpy(&p[offset], header.packet, header.bytes);
81 offset += header.bytes;
82 memcpy(&p[offset], header_comm.packet, header_comm.bytes);
83 offset += header_comm.bytes;
84 memcpy(&p[offset], header_code.packet, header_code.bytes);
85 offset += header_code.bytes;
86 avccontext->extradata_size = offset;
87 avccontext->extradata= av_realloc(avccontext->extradata, avccontext->extradata_size);
89 /* vorbis_block_clear(&context->vb);
90 vorbis_dsp_clear(&context->vd);
91 vorbis_info_clear(&context->vi);*/
92 vorbis_comment_clear(&context->vc);
94 avccontext->frame_size = OGGVORBIS_FRAME_SIZE ;
96 avccontext->coded_frame= avcodec_alloc_frame();
97 avccontext->coded_frame->key_frame= 1;
103 static int oggvorbis_encode_frame(AVCodecContext *avccontext,
104 unsigned char *packets,
105 int buf_size, void *data)
107 OggVorbisContext *context = avccontext->priv_data ;
110 signed short *audio = data ;
111 int l, samples = data ? OGGVORBIS_FRAME_SIZE : 0;
113 buffer = vorbis_analysis_buffer(&context->vd, samples) ;
115 if(context->vi.channels == 1) {
116 for(l = 0 ; l < samples ; l++)
117 buffer[0][l]=audio[l]/32768.f;
119 for(l = 0 ; l < samples ; l++){
120 buffer[0][l]=audio[l*2]/32768.f;
121 buffer[1][l]=audio[l*2+1]/32768.f;
125 vorbis_analysis_wrote(&context->vd, samples) ;
127 while(vorbis_analysis_blockout(&context->vd, &context->vb) == 1) {
128 vorbis_analysis(&context->vb, NULL);
129 vorbis_bitrate_addblock(&context->vb) ;
131 while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
132 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
134 memcpy(context->buffer + context->buffer_index, &op, sizeof(ogg_packet));
135 context->buffer_index += sizeof(ogg_packet);
136 memcpy(context->buffer + context->buffer_index, op.packet, op.bytes);
137 context->buffer_index += op.bytes;
138 // av_log(avccontext, AV_LOG_DEBUG, "e%d / %d\n", context->buffer_index, op.bytes);
143 if(context->buffer_index){
144 ogg_packet *op2= (ogg_packet*)context->buffer;
145 op2->packet = context->buffer + sizeof(ogg_packet);
148 avccontext->coded_frame->pts= av_rescale_q(op2->granulepos, (AVRational){1, avccontext->sample_rate}, avccontext->time_base);
149 //FIXME we should reorder the user supplied pts and not assume that they are spaced by 1/sample_rate
151 memcpy(packets, op2->packet, l);
152 context->buffer_index -= l + sizeof(ogg_packet);
153 memcpy(context->buffer, context->buffer + l + sizeof(ogg_packet), context->buffer_index);
154 // av_log(avccontext, AV_LOG_DEBUG, "E%d\n", l);
161 static int oggvorbis_encode_close(AVCodecContext *avccontext) {
162 OggVorbisContext *context = avccontext->priv_data ;
163 /* ogg_packet op ; */
165 vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
167 vorbis_block_clear(&context->vb);
168 vorbis_dsp_clear(&context->vd);
169 vorbis_info_clear(&context->vi);
171 av_freep(&avccontext->coded_frame);
172 av_freep(&avccontext->extradata);
178 AVCodec oggvorbis_encoder = {
182 sizeof(OggVorbisContext),
183 oggvorbis_encode_init,
184 oggvorbis_encode_frame,
185 oggvorbis_encode_close,
186 .capabilities= CODEC_CAP_DELAY,
189 static int oggvorbis_decode_init(AVCodecContext *avccontext) {
190 OggVorbisContext *context = avccontext->priv_data ;
191 uint8_t *p= avccontext->extradata;
193 unsigned char *headers[3], *extradata = avccontext->extradata;
195 vorbis_info_init(&context->vi) ;
196 vorbis_comment_init(&context->vc) ;
198 if(! avccontext->extradata_size || ! p) {
199 av_log(avccontext, AV_LOG_ERROR, "vorbis extradata absent\n");
203 if(p[0] == 0 && p[1] == 30) {
204 for(i = 0; i < 3; i++){
205 hsizes[i] = *p++ << 8;
211 unsigned int offset = 1;
215 while((*p == 0xFF) && (offset < avccontext->extradata_size)) {
220 if(offset >= avccontext->extradata_size - 1) {
221 av_log(avccontext, AV_LOG_ERROR,
222 "vorbis header sizes damaged\n");
229 hsizes[2] = avccontext->extradata_size - hsizes[0]-hsizes[1]-offset;
231 av_log(avccontext, AV_LOG_DEBUG,
232 "vorbis header sizes: %d, %d, %d, / extradata_len is %d \n",
233 hsizes[0], hsizes[1], hsizes[2], avccontext->extradata_size);
235 headers[0] = extradata + offset;
236 headers[1] = extradata + offset + hsizes[0];
237 headers[2] = extradata + offset + hsizes[0] + hsizes[1];
239 av_log(avccontext, AV_LOG_ERROR,
240 "vorbis initial header len is wrong: %d\n", *p);
245 context->op.b_o_s= i==0;
246 context->op.bytes = hsizes[i];
247 context->op.packet = headers[i];
248 if(vorbis_synthesis_headerin(&context->vi, &context->vc, &context->op)<0){
249 av_log(avccontext, AV_LOG_ERROR, "%d. vorbis header damaged\n", i+1);
254 avccontext->channels = context->vi.channels;
255 avccontext->sample_rate = context->vi.rate;
256 avccontext->time_base= (AVRational){1, avccontext->sample_rate};
258 vorbis_synthesis_init(&context->vd, &context->vi);
259 vorbis_block_init(&context->vd, &context->vb);
265 static inline int conv(int samples, float **pcm, char *buf, int channels) {
267 ogg_int16_t *ptr, *data = (ogg_int16_t*)buf ;
270 for(i = 0 ; i < channels ; i++){
274 for(j = 0 ; j < samples ; j++) {
276 val = mono[j] * 32767.f;
278 if(val > 32767) val = 32767 ;
279 if(val < -32768) val = -32768 ;
290 static int oggvorbis_decode_frame(AVCodecContext *avccontext,
291 void *data, int *data_size,
292 uint8_t *buf, int buf_size)
294 OggVorbisContext *context = avccontext->priv_data ;
296 ogg_packet *op= &context->op;
297 int samples, total_samples, total_bytes;
305 op->bytes = buf_size;
307 // 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);
309 /* for(i=0; i<op->bytes; i++)
310 av_log(avccontext, AV_LOG_DEBUG, "%02X ", op->packet[i]);
311 av_log(avccontext, AV_LOG_DEBUG, "\n");*/
313 if(vorbis_synthesis(&context->vb, op) == 0)
314 vorbis_synthesis_blockin(&context->vd, &context->vb) ;
319 while((samples = vorbis_synthesis_pcmout(&context->vd, &pcm)) > 0) {
320 conv(samples, pcm, (char*)data + total_bytes, context->vi.channels) ;
321 total_bytes += samples * 2 * context->vi.channels ;
322 total_samples += samples ;
323 vorbis_synthesis_read(&context->vd, samples) ;
326 *data_size = total_bytes ;
331 static int oggvorbis_decode_close(AVCodecContext *avccontext) {
332 OggVorbisContext *context = avccontext->priv_data ;
334 vorbis_info_clear(&context->vi) ;
335 vorbis_comment_clear(&context->vc) ;
341 AVCodec oggvorbis_decoder = {
345 sizeof(OggVorbisContext),
346 oggvorbis_decode_init,
348 oggvorbis_decode_close,
349 oggvorbis_decode_frame,
350 .capabilities= CODEC_CAP_DELAY,