3 * Ogg Vorbis codec support via libvorbisenc.
4 * @author Mark Hills <mark@pogo.org.uk>
9 #include <vorbis/vorbisenc.h>
12 #include "oggvorbis.h"
14 #define OGGVORBIS_FRAME_SIZE 1024
17 typedef struct OggVorbisContext {
27 int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext) {
29 #ifdef OGGVORBIS_VBR_BY_ESTIMATE
30 /* variable bitrate by estimate */
32 return (vorbis_encode_setup_managed(vi, avccontext->channels,
33 avccontext->sample_rate, -1, avccontext->bit_rate, -1) ||
34 vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE_AVG, NULL) ||
35 vorbis_encode_setup_init(vi)) ;
37 /* constant bitrate */
39 return vorbis_encode_init(vi, avccontext->channels,
40 avccontext->sample_rate, -1, avccontext->bit_rate, -1) ;
45 static int oggvorbis_encode_init(AVCodecContext *avccontext) {
46 OggVorbisContext *context = avccontext->priv_data ;
48 vorbis_info_init(&context->vi) ;
49 if(oggvorbis_init_encoder(&context->vi, avccontext) < 0) {
50 fprintf(stderr, "oggvorbis_encode_init: init_encoder failed") ;
53 vorbis_analysis_init(&context->vd, &context->vi) ;
54 vorbis_block_init(&context->vd, &context->vb) ;
56 avccontext->frame_size = OGGVORBIS_FRAME_SIZE ;
58 avccontext->coded_frame= avcodec_alloc_frame();
59 avccontext->coded_frame->key_frame= 1;
65 static int oggvorbis_encode_frame(AVCodecContext *avccontext,
66 unsigned char *packets,
67 int buf_size, void *data)
69 OggVorbisContext *context = avccontext->priv_data ;
72 signed char *audio = data ;
73 int l, samples = OGGVORBIS_FRAME_SIZE ;
75 buffer = vorbis_analysis_buffer(&context->vd, samples) ;
77 if(context->vi.channels == 1) {
78 for(l = 0 ; l < samples ; l++)
79 buffer[0][l]=((audio[l*2+1]<<8)|(0x00ff&(int)audio[l*2]))/32768.f;
81 for(l = 0 ; l < samples ; l++){
82 buffer[0][l]=((audio[l*4+1]<<8)|(0x00ff&(int)audio[l*4]))/32768.f;
83 buffer[1][l]=((audio[l*4+3]<<8)|(0x00ff&(int)audio[l*4+2]))/32768.f;
87 vorbis_analysis_wrote(&context->vd, samples) ;
91 while(vorbis_analysis_blockout(&context->vd, &context->vb) == 1) {
92 vorbis_analysis(&context->vb, NULL);
93 vorbis_bitrate_addblock(&context->vb) ;
95 while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
96 memcpy(packets + l, &op, sizeof(ogg_packet)) ;
97 memcpy(packets + l + sizeof(ogg_packet), op.packet, op.bytes) ;
98 l += sizeof(ogg_packet) + op.bytes ;
106 static int oggvorbis_encode_close(AVCodecContext *avccontext) {
107 OggVorbisContext *context = avccontext->priv_data ;
108 /* ogg_packet op ; */
110 vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
112 /* We need to write all the remaining packets into the stream
115 fprintf(stderr, "fixme: not all packets written on oggvorbis_encode_close()\n") ;
118 while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
119 memcpy(packets + l, &op, sizeof(ogg_packet)) ;
120 memcpy(packets + l + sizeof(ogg_packet), op.packet, op.bytes) ;
121 l += sizeof(ogg_packet) + op.bytes ;
125 vorbis_block_clear(&context->vb);
126 vorbis_dsp_clear(&context->vd);
127 vorbis_info_clear(&context->vi);
129 av_freep(&avccontext->coded_frame);
135 AVCodec oggvorbis_encoder = {
139 sizeof(OggVorbisContext),
140 oggvorbis_encode_init,
141 oggvorbis_encode_frame,
142 oggvorbis_encode_close
146 static int oggvorbis_decode_init(AVCodecContext *avccontext) {
147 OggVorbisContext *context = avccontext->priv_data ;
149 vorbis_info_init(&context->vi) ;
150 vorbis_comment_init(&context->vc) ;
156 static inline int conv(int samples, float **pcm, char *buf, int channels) {
158 ogg_int16_t *ptr, *data = (ogg_int16_t*)buf ;
161 for(i = 0 ; i < channels ; i++){
165 for(j = 0 ; j < samples ; j++) {
167 val = mono[j] * 32767.f;
169 if(val > 32767) val = 32767 ;
170 if(val < -32768) val = -32768 ;
181 static int oggvorbis_decode_frame(AVCodecContext *avccontext,
182 void *data, int *data_size,
183 uint8_t *buf, int buf_size)
185 OggVorbisContext *context = avccontext->priv_data ;
186 ogg_packet *op = (ogg_packet*)buf ;
188 int samples, total_samples, total_bytes ;
190 op->packet = (char*)op + sizeof(ogg_packet) ; /* correct data pointer */
192 if(op->packetno < 3) {
193 vorbis_synthesis_headerin(&context->vi, &context->vc, op) ;
197 if(op->packetno == 3) {
198 fprintf(stderr, "vorbis_decode: %d channel, %ldHz, encoder `%s'\n",
199 context->vi.channels, context->vi.rate, context->vc.vendor);
201 avccontext->channels = context->vi.channels ;
202 avccontext->sample_rate = context->vi.rate ;
204 vorbis_synthesis_init(&context->vd, &context->vi) ;
205 vorbis_block_init(&context->vd, &context->vb);
208 if(vorbis_synthesis(&context->vb, op) == 0)
209 vorbis_synthesis_blockin(&context->vd, &context->vb) ;
214 while((samples = vorbis_synthesis_pcmout(&context->vd, &pcm)) > 0) {
215 conv(samples, pcm, (char*)data + total_bytes, context->vi.channels) ;
216 total_bytes += samples * 2 * context->vi.channels ;
217 total_samples += samples ;
218 vorbis_synthesis_read(&context->vd, samples) ;
221 *data_size = total_bytes ;
226 static int oggvorbis_decode_close(AVCodecContext *avccontext) {
227 OggVorbisContext *context = avccontext->priv_data ;
229 vorbis_info_clear(&context->vi) ;
230 vorbis_comment_clear(&context->vc) ;
236 AVCodec oggvorbis_decoder = {
240 sizeof(OggVorbisContext),
241 oggvorbis_decode_init,
243 oggvorbis_decode_close,
244 oggvorbis_decode_frame,