/** * @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, } ;