141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
/*
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* Ogg Vorbis codec support via libvorbisenc
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* Mark Hills <mark@pogo.org.uk>
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*/
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#include <time.h>
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#include <vorbis/vorbisenc.h>
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#include "avcodec.h"
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#include "oggvorbis.h"
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#define OGGVORBIS_FRAME_SIZE 1024
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typedef struct OggVorbisContext {
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vorbis_info vi ;
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vorbis_dsp_state vd ;
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vorbis_block vb ;
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} OggVorbisContext ;
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int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext) {
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if(avccontext->quality) { /* VBR requested */
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fprintf(stderr, "init_encode: channels=%d quality=%d\n",
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avccontext->channels, avccontext->quality) ;
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return vorbis_encode_init_vbr(vi, avccontext->channels,
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avccontext->sample_rate, (float)avccontext->quality / 1000) ;
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}
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fprintf(stderr, "init_encoder: channels=%d bitrate=%d tolerance=%d\n",
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avccontext->channels, avccontext->bit_rate,
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avccontext->bit_rate_tolerance) ;
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return vorbis_encode_init(vi, avccontext->channels,
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avccontext->sample_rate, -1, avccontext->bit_rate, -1) ;
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}
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static int oggvorbis_encode_init(AVCodecContext *avccontext) {
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OggVorbisContext *context = avccontext->priv_data ;
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fprintf(stderr, "oggvorbis_encode_init\n") ;
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vorbis_info_init(&context->vi) ;
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if(oggvorbis_init_encoder(&context->vi, avccontext) < 0) {
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fprintf(stderr, "oggvorbis_encode_init: init_encoder failed") ;
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return -1 ;
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}
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vorbis_analysis_init(&context->vd, &context->vi) ;
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vorbis_block_init(&context->vd, &context->vb) ;
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avccontext->frame_size = OGGVORBIS_FRAME_SIZE ;
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return 0 ;
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}
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int oggvorbis_encode_frame(AVCodecContext *avccontext, unsigned char *packets,
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int buf_size, void *data)
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{
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OggVorbisContext *context = avccontext->priv_data ;
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float **buffer ;
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ogg_packet op ;
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signed char *audio = data ;
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int l, samples = buf_size / 16 ; /* samples = OGGVORBIS_FRAME_SIZE */ ;
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buffer = vorbis_analysis_buffer(&context->vd, samples) ;
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if(context->vi.channels == 1) {
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for(l = 0 ; l < samples ; l++)
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buffer[0][l]=((audio[l*2+1]<<8)|(0x00ff&(int)audio[l*2]))/32768.f;
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} else {
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for(l = 0 ; l < samples ; l++){
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buffer[0][l]=((audio[l*4+1]<<8)|(0x00ff&(int)audio[l*4]))/32768.f;
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buffer[1][l]=((audio[l*4+3]<<8)|(0x00ff&(int)audio[l*4+2]))/32768.f;
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}
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}
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vorbis_analysis_wrote(&context->vd, samples) ;
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l = 0 ;
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while(vorbis_analysis_blockout(&context->vd, &context->vb) == 1) {
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vorbis_analysis(&context->vb, NULL);
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vorbis_bitrate_addblock(&context->vb) ;
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while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
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memcpy(packets + l, &op, sizeof(ogg_packet)) ;
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memcpy(packets + l + sizeof(ogg_packet), op.packet, op.bytes) ;
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l += sizeof(ogg_packet) + op.bytes ;
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}
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}
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return l ;
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}
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int oggvorbis_encode_close(AVCodecContext *avccontext) {
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OggVorbisContext *context = avccontext->priv_data ;
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/* ogg_packet op ; */
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fprintf(stderr, "oggvorbis_encode_close\n") ;
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vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
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/* We need to write all the remaining packets into the stream
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* on closing */
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/*
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while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
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memcpy(packets + l, &op, sizeof(ogg_packet)) ;
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memcpy(packets + l + sizeof(ogg_packet), op.packet, op.bytes) ;
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l += sizeof(ogg_packet) + op.bytes ;
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}
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*/
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vorbis_block_clear(&context->vb);
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vorbis_dsp_clear(&context->vd);
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vorbis_info_clear(&context->vi);
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return 0 ;
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}
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AVCodec oggvorbis_encoder = {
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"vorbis",
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CODEC_TYPE_AUDIO,
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CODEC_ID_VORBIS,
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sizeof(OggVorbisContext),
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oggvorbis_encode_init,
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oggvorbis_encode_frame,
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oggvorbis_encode_close
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};
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