yading@10: /* yading@10: * Copyright (c) 2002 Mark Hills yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: #include yading@10: yading@10: #include "avcodec.h" yading@10: #include "bytestream.h" yading@10: #include "internal.h" yading@10: yading@10: typedef struct OggVorbisDecContext { yading@10: vorbis_info vi; /**< vorbis_info used during init */ yading@10: vorbis_dsp_state vd; /**< DSP state used for analysis */ yading@10: vorbis_block vb; /**< vorbis_block used for analysis */ yading@10: vorbis_comment vc; /**< VorbisComment info */ yading@10: ogg_packet op; /**< ogg packet */ yading@10: } OggVorbisDecContext; yading@10: yading@10: static int oggvorbis_decode_init(AVCodecContext *avccontext) { yading@10: OggVorbisDecContext *context = avccontext->priv_data ; yading@10: uint8_t *p= avccontext->extradata; yading@10: int i, hsizes[3]; yading@10: unsigned char *headers[3], *extradata = avccontext->extradata; yading@10: yading@10: vorbis_info_init(&context->vi) ; yading@10: vorbis_comment_init(&context->vc) ; yading@10: yading@10: if(! avccontext->extradata_size || ! p) { yading@10: av_log(avccontext, AV_LOG_ERROR, "vorbis extradata absent\n"); yading@10: return -1; yading@10: } yading@10: yading@10: if(p[0] == 0 && p[1] == 30) { yading@10: for(i = 0; i < 3; i++){ yading@10: hsizes[i] = bytestream_get_be16((const uint8_t **)&p); yading@10: headers[i] = p; yading@10: p += hsizes[i]; yading@10: } yading@10: } else if(*p == 2) { yading@10: unsigned int offset = 1; yading@10: p++; yading@10: for(i=0; i<2; i++) { yading@10: hsizes[i] = 0; yading@10: while((*p == 0xFF) && (offset < avccontext->extradata_size)) { yading@10: hsizes[i] += 0xFF; yading@10: offset++; yading@10: p++; yading@10: } yading@10: if(offset >= avccontext->extradata_size - 1) { yading@10: av_log(avccontext, AV_LOG_ERROR, yading@10: "vorbis header sizes damaged\n"); yading@10: return -1; yading@10: } yading@10: hsizes[i] += *p; yading@10: offset++; yading@10: p++; yading@10: } yading@10: hsizes[2] = avccontext->extradata_size - hsizes[0]-hsizes[1]-offset; yading@10: #if 0 yading@10: av_log(avccontext, AV_LOG_DEBUG, yading@10: "vorbis header sizes: %d, %d, %d, / extradata_len is %d \n", yading@10: hsizes[0], hsizes[1], hsizes[2], avccontext->extradata_size); yading@10: #endif yading@10: headers[0] = extradata + offset; yading@10: headers[1] = extradata + offset + hsizes[0]; yading@10: headers[2] = extradata + offset + hsizes[0] + hsizes[1]; yading@10: } else { yading@10: av_log(avccontext, AV_LOG_ERROR, yading@10: "vorbis initial header len is wrong: %d\n", *p); yading@10: return -1; yading@10: } yading@10: yading@10: for(i=0; i<3; i++){ yading@10: context->op.b_o_s= i==0; yading@10: context->op.bytes = hsizes[i]; yading@10: context->op.packet = headers[i]; yading@10: if(vorbis_synthesis_headerin(&context->vi, &context->vc, &context->op)<0){ yading@10: av_log(avccontext, AV_LOG_ERROR, "%d. vorbis header damaged\n", i+1); yading@10: return -1; yading@10: } yading@10: } yading@10: yading@10: avccontext->channels = context->vi.channels; yading@10: avccontext->sample_rate = context->vi.rate; yading@10: avccontext->sample_fmt = AV_SAMPLE_FMT_S16; yading@10: avccontext->time_base= (AVRational){1, avccontext->sample_rate}; yading@10: yading@10: vorbis_synthesis_init(&context->vd, &context->vi); yading@10: vorbis_block_init(&context->vd, &context->vb); yading@10: yading@10: return 0 ; yading@10: } yading@10: yading@10: yading@10: static inline int conv(int samples, float **pcm, char *buf, int channels) { yading@10: int i, j; yading@10: ogg_int16_t *ptr, *data = (ogg_int16_t*)buf ; yading@10: float *mono ; yading@10: yading@10: for(i = 0 ; i < channels ; i++){ yading@10: ptr = &data[i]; yading@10: mono = pcm[i] ; yading@10: yading@10: for(j = 0 ; j < samples ; j++) { yading@10: *ptr = av_clip_int16(mono[j] * 32767.f); yading@10: ptr += channels; yading@10: } yading@10: } yading@10: yading@10: return 0 ; yading@10: } yading@10: yading@10: static int oggvorbis_decode_frame(AVCodecContext *avccontext, void *data, yading@10: int *got_frame_ptr, AVPacket *avpkt) yading@10: { yading@10: OggVorbisDecContext *context = avccontext->priv_data ; yading@10: AVFrame *frame = data; yading@10: float **pcm ; yading@10: ogg_packet *op= &context->op; yading@10: int samples, total_samples, total_bytes; yading@10: int ret; yading@10: int16_t *output; yading@10: yading@10: if(!avpkt->size){ yading@10: //FIXME flush yading@10: return 0; yading@10: } yading@10: yading@10: frame->nb_samples = 8192*4; yading@10: if ((ret = ff_get_buffer(avccontext, frame, 0)) < 0) yading@10: return ret; yading@10: output = (int16_t *)frame->data[0]; yading@10: yading@10: yading@10: op->packet = avpkt->data; yading@10: op->bytes = avpkt->size; yading@10: yading@10: // av_log(avccontext, AV_LOG_DEBUG, "%d %d %d %"PRId64" %"PRId64" %d %d\n", op->bytes, op->b_o_s, op->e_o_s, op->granulepos, op->packetno, buf_size, context->vi.rate); yading@10: yading@10: /* for(i=0; ibytes; i++) yading@10: av_log(avccontext, AV_LOG_DEBUG, "%02X ", op->packet[i]); yading@10: av_log(avccontext, AV_LOG_DEBUG, "\n");*/ yading@10: yading@10: if(vorbis_synthesis(&context->vb, op) == 0) yading@10: vorbis_synthesis_blockin(&context->vd, &context->vb) ; yading@10: yading@10: total_samples = 0 ; yading@10: total_bytes = 0 ; yading@10: yading@10: while((samples = vorbis_synthesis_pcmout(&context->vd, &pcm)) > 0) { yading@10: conv(samples, pcm, (char*)output + total_bytes, context->vi.channels) ; yading@10: total_bytes += samples * 2 * context->vi.channels ; yading@10: total_samples += samples ; yading@10: vorbis_synthesis_read(&context->vd, samples) ; yading@10: } yading@10: yading@10: frame->nb_samples = total_samples; yading@10: *got_frame_ptr = 1; yading@10: return avpkt->size; yading@10: } yading@10: yading@10: yading@10: static int oggvorbis_decode_close(AVCodecContext *avccontext) { yading@10: OggVorbisDecContext *context = avccontext->priv_data ; yading@10: yading@10: vorbis_info_clear(&context->vi) ; yading@10: vorbis_comment_clear(&context->vc) ; yading@10: yading@10: return 0 ; yading@10: } yading@10: yading@10: yading@10: AVCodec ff_libvorbis_decoder = { yading@10: .name = "libvorbis", yading@10: .type = AVMEDIA_TYPE_AUDIO, yading@10: .id = AV_CODEC_ID_VORBIS, yading@10: .priv_data_size = sizeof(OggVorbisDecContext), yading@10: .init = oggvorbis_decode_init, yading@10: .decode = oggvorbis_decode_frame, yading@10: .close = oggvorbis_decode_close, yading@10: .capabilities = CODEC_CAP_DELAY, yading@10: .long_name = NULL_IF_CONFIG_SMALL("libvorbis"), yading@10: };