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