+++ /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