--- /dev/null
+/**
+ * @file oggvorbis.c
+ * Ogg Vorbis codec support via libvorbisenc.
+ * @author Mark Hills <mark@pogo.org.uk>
+ */
+
+#include <time.h>
+
+#include <vorbis/vorbisenc.h>
+
+#include "avcodec.h"
+#include "oggvorbis.h"
+
+#define OGGVORBIS_FRAME_SIZE 1024
+
+
+typedef struct OggVorbisContext {
+ vorbis_info vi ;
+ vorbis_dsp_state vd ;
+ vorbis_block vb ;
+
+ /* decoder */
+ vorbis_comment vc ;
+} OggVorbisContext ;
+
+
+int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext) {
+
+#ifdef OGGVORBIS_VBR_BY_ESTIMATE
+ /* variable bitrate by estimate */
+
+ return (vorbis_encode_setup_managed(vi, avccontext->channels,
+ avccontext->sample_rate, -1, avccontext->bit_rate, -1) ||
+ vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE_AVG, NULL) ||
+ vorbis_encode_setup_init(vi)) ;
+#else
+ /* constant bitrate */
+
+ return vorbis_encode_init(vi, avccontext->channels,
+ avccontext->sample_rate, -1, avccontext->bit_rate, -1) ;
+#endif
+}
+
+
+static int oggvorbis_encode_init(AVCodecContext *avccontext) {
+ OggVorbisContext *context = avccontext->priv_data ;
+
+ vorbis_info_init(&context->vi) ;
+ if(oggvorbis_init_encoder(&context->vi, avccontext) < 0) {
+ fprintf(stderr, "oggvorbis_encode_init: init_encoder failed") ;
+ return -1 ;
+ }
+ vorbis_analysis_init(&context->vd, &context->vi) ;
+ vorbis_block_init(&context->vd, &context->vb) ;
+
+ avccontext->frame_size = OGGVORBIS_FRAME_SIZE ;
+
+ avccontext->coded_frame= avcodec_alloc_frame();
+ avccontext->coded_frame->key_frame= 1;
+
+ return 0 ;
+}
+
+
+static int oggvorbis_encode_frame(AVCodecContext *avccontext,
+ unsigned char *packets,
+ int buf_size, void *data)
+{
+ OggVorbisContext *context = avccontext->priv_data ;
+ float **buffer ;
+ ogg_packet op ;
+ signed char *audio = data ;
+ int l, samples = OGGVORBIS_FRAME_SIZE ;
+
+ buffer = vorbis_analysis_buffer(&context->vd, samples) ;
+
+ if(context->vi.channels == 1) {
+ for(l = 0 ; l < samples ; l++)
+ buffer[0][l]=((audio[l*2+1]<<8)|(0x00ff&(int)audio[l*2]))/32768.f;
+ } else {
+ for(l = 0 ; l < samples ; l++){
+ buffer[0][l]=((audio[l*4+1]<<8)|(0x00ff&(int)audio[l*4]))/32768.f;
+ buffer[1][l]=((audio[l*4+3]<<8)|(0x00ff&(int)audio[l*4+2]))/32768.f;
+ }
+ }
+
+ vorbis_analysis_wrote(&context->vd, samples) ;
+
+ l = 0 ;
+
+ while(vorbis_analysis_blockout(&context->vd, &context->vb) == 1) {
+ vorbis_analysis(&context->vb, NULL);
+ vorbis_bitrate_addblock(&context->vb) ;
+
+ while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
+ memcpy(packets + l, &op, sizeof(ogg_packet)) ;
+ memcpy(packets + l + sizeof(ogg_packet), op.packet, op.bytes) ;
+ l += sizeof(ogg_packet) + op.bytes ;
+ }
+ }
+
+ return l ;
+}
+
+
+static int oggvorbis_encode_close(AVCodecContext *avccontext) {
+ OggVorbisContext *context = avccontext->priv_data ;
+/* ogg_packet op ; */
+
+ vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
+
+ /* We need to write all the remaining packets into the stream
+ * on closing */
+
+ fprintf(stderr, "fixme: not all packets written on oggvorbis_encode_close()\n") ;
+
+/*
+ while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
+ memcpy(packets + l, &op, sizeof(ogg_packet)) ;
+ memcpy(packets + l + sizeof(ogg_packet), op.packet, op.bytes) ;
+ l += sizeof(ogg_packet) + op.bytes ;
+ }
+*/
+
+ vorbis_block_clear(&context->vb);
+ vorbis_dsp_clear(&context->vd);
+ vorbis_info_clear(&context->vi);
+
+ av_freep(&avccontext->coded_frame);
+
+ return 0 ;
+}
+
+
+AVCodec oggvorbis_encoder = {
+ "vorbis",
+ CODEC_TYPE_AUDIO,
+ CODEC_ID_VORBIS,
+ sizeof(OggVorbisContext),
+ oggvorbis_encode_init,
+ oggvorbis_encode_frame,
+ oggvorbis_encode_close
+} ;
+
+
+static int oggvorbis_decode_init(AVCodecContext *avccontext) {
+ OggVorbisContext *context = avccontext->priv_data ;
+
+ vorbis_info_init(&context->vi) ;
+ vorbis_comment_init(&context->vc) ;
+
+ return 0 ;
+}
+
+
+static inline int conv(int samples, float **pcm, char *buf, int channels) {
+ int i, j, val ;
+ ogg_int16_t *ptr, *data = (ogg_int16_t*)buf ;
+ float *mono ;
+
+ for(i = 0 ; i < channels ; i++){
+ ptr = &data[i];
+ mono = pcm[i] ;
+
+ for(j = 0 ; j < samples ; j++) {
+
+ val = mono[j] * 32767.f;
+
+ if(val > 32767) val = 32767 ;
+ if(val < -32768) val = -32768 ;
+
+ *ptr = val ;
+ ptr += channels;
+ }
+ }
+
+ return 0 ;
+}
+
+
+static int oggvorbis_decode_frame(AVCodecContext *avccontext,
+ void *data, int *data_size,
+ uint8_t *buf, int buf_size)
+{
+ OggVorbisContext *context = avccontext->priv_data ;
+ ogg_packet *op = (ogg_packet*)buf ;
+ float **pcm ;
+ int samples, total_samples, total_bytes ;
+
+ op->packet = (char*)op + sizeof(ogg_packet) ; /* correct data pointer */
+
+ if(op->packetno < 3) {
+ vorbis_synthesis_headerin(&context->vi, &context->vc, op) ;
+ return buf_size ;
+ }
+
+ if(op->packetno == 3) {
+ fprintf(stderr, "vorbis_decode: %d channel, %ldHz, encoder `%s'\n",
+ context->vi.channels, context->vi.rate, context->vc.vendor);
+
+ avccontext->channels = context->vi.channels ;
+ avccontext->sample_rate = context->vi.rate ;
+
+ vorbis_synthesis_init(&context->vd, &context->vi) ;
+ vorbis_block_init(&context->vd, &context->vb);
+ }
+
+ if(vorbis_synthesis(&context->vb, op) == 0)
+ vorbis_synthesis_blockin(&context->vd, &context->vb) ;
+
+ total_samples = 0 ;
+ total_bytes = 0 ;
+
+ while((samples = vorbis_synthesis_pcmout(&context->vd, &pcm)) > 0) {
+ conv(samples, pcm, (char*)data + total_bytes, context->vi.channels) ;
+ total_bytes += samples * 2 * context->vi.channels ;
+ total_samples += samples ;
+ vorbis_synthesis_read(&context->vd, samples) ;
+ }
+
+ *data_size = total_bytes ;
+ return buf_size ;
+}
+
+
+static int oggvorbis_decode_close(AVCodecContext *avccontext) {
+ OggVorbisContext *context = avccontext->priv_data ;
+
+ vorbis_info_clear(&context->vi) ;
+ vorbis_comment_clear(&context->vc) ;
+
+ return 0 ;
+}
+
+
+AVCodec oggvorbis_decoder = {
+ "vorbis",
+ CODEC_TYPE_AUDIO,
+ CODEC_ID_VORBIS,
+ sizeof(OggVorbisContext),
+ oggvorbis_decode_init,
+ NULL,
+ oggvorbis_decode_close,
+ oggvorbis_decode_frame,
+} ;
projects / synfig.git / blobdiff