示例#1
0
int opusEncoder(int argc, char **argv)
{
  static const input_format raw_format = {NULL, 0, raw_open, wav_close, "raw",N_("RAW file reader")};
  int option_index=0;
  struct option long_options[] =
  {
    {"quiet", no_argument, NULL, 0},
    {"bitrate", required_argument, NULL, 0},
    {"hard-cbr",no_argument,NULL, 0},
    {"vbr",no_argument,NULL, 0},
    {"cvbr",no_argument,NULL, 0},
    {"comp", required_argument, NULL, 0},
    {"complexity", required_argument, NULL, 0},
    {"framesize", required_argument, NULL, 0},
    {"expect-loss", required_argument, NULL, 0},
    {"downmix-mono",no_argument,NULL, 0},
    {"downmix-stereo",no_argument,NULL, 0},
    {"no-downmix",no_argument,NULL, 0},
    {"max-delay", required_argument, NULL, 0},
    {"serial", required_argument, NULL, 0},
    {"save-range", required_argument, NULL, 0},
    {"set-ctl-int", required_argument, NULL, 0},
    {"help", no_argument, NULL, 0},
    {"raw", no_argument, NULL, 0},
    {"raw-bits", required_argument, NULL, 0},
    {"raw-rate", required_argument, NULL, 0},
    {"raw-chan", required_argument, NULL, 0},
    {"raw-endianness", required_argument, NULL, 0},
    {"ignorelength", no_argument, NULL, 0},
    {"rate", required_argument, NULL, 0},
    {"version", no_argument, NULL, 0},
    {"version-short", no_argument, NULL, 0},
    {"comment", required_argument, NULL, 0},
    {"artist", required_argument, NULL, 0},
    {"title", required_argument, NULL, 0},
    {"album", required_argument, NULL, 0},
    {"date", required_argument, NULL, 0},
    {"genre", required_argument, NULL, 0},
    {"picture", required_argument, NULL, 0},
    {"padding", required_argument, NULL, 0},
    {"discard-comments", no_argument, NULL, 0},
    {"discard-pictures", no_argument, NULL, 0},
    {0, 0, 0, 0}
  };
  int i, ret;
  int                cline_size;
  OpusMSEncoder      *st;
  const char         *opus_version;
  unsigned char      *packet;
  float              *input;
  /*I/O*/
  oe_enc_opt         inopt;
  const input_format *in_format;
  char               *inFile;
  char               *outFile;
  char               *range_file;
  FILE               *fin;
  FILE               *fout;
  FILE               *frange;
  ogg_stream_state   os;
  ogg_page           og;
  ogg_packet         op;
  ogg_int64_t        last_granulepos=0;
  ogg_int64_t        enc_granulepos=0;
  ogg_int64_t        original_samples=0;
  ogg_int32_t        id=-1;
  int                last_segments=0;
  int                eos=0;
  OpusHeader         header;
  char               ENCODER_string[1024];
  /*Counters*/
  opus_int64         nb_encoded=0;
  opus_int64         bytes_written=0;
  opus_int64         pages_out=0;
  opus_int64         total_bytes=0;
  opus_int64         total_samples=0;
  opus_int32         nbBytes;
  opus_int32         nb_samples;
  opus_int32         peak_bytes=0;
  opus_int32         min_bytes;
  time_t             start_time;
  time_t             stop_time;
  time_t             last_spin=0;
  int                last_spin_len=0;
  /*Settings*/
  int                quiet=0;
  int                max_frame_bytes;
  opus_int32         bitrate=-1;
  opus_int32         rate=48000;
  opus_int32         coding_rate=48000;
  opus_int32         frame_size=960;
  int                chan=2;
  int                with_hard_cbr=0;
  int                with_cvbr=0;
  int                expect_loss=0;
  int                complexity=10;
  int                downmix=0;
  int                *opt_ctls_ctlval;
  int                opt_ctls=0;
  int                max_ogg_delay=48000; /*48kHz samples*/
  int                seen_file_icons=0;
  int                comment_padding=512;
  int                serialno;
  opus_int32         lookahead=0;
#ifdef WIN_UNICODE
   int argc_utf8;
   char **argv_utf8;
#endif

   if(query_cpu_support()){
     fprintf(stderr,"\n\n** WARNING: This program was compiled with SSE%s\n",query_cpu_support()>1?"2":"");
     fprintf(stderr,"            but this CPU claims to lack these instructions. **\n\n");
   }

#ifdef WIN_UNICODE
   (void)argc;
   (void)argv;

   init_commandline_arguments_utf8(&argc_utf8, &argv_utf8);
#endif

  opt_ctls_ctlval=NULL;
  frange=NULL;
  range_file=NULL;
  in_format=NULL;
  inopt.channels=chan;
  inopt.rate=coding_rate=rate;
  /* 0 dB gain is recommended unless you know what you're doing */
  inopt.gain=0;
  inopt.samplesize=16;
  inopt.endianness=0;
  inopt.rawmode=0;
  inopt.ignorelength=0;
  inopt.copy_comments=1;
  inopt.copy_pictures=1;

  start_time = time(NULL);
  srand(((getpid()&65535)<<15)^start_time);
  serialno=rand();

  opus_version=opus_get_version_string();
  /*Vendor string should just be the encoder library,
    the ENCODER comment specifies the tool used.*/
  comment_init(&inopt.comments, &inopt.comments_length, opus_version);
//  snprintf(ENCODER_string, sizeof(ENCODER_string), "opusenc from %s %s",PACKAGE_NAME,PACKAGE_VERSION);
  comment_add(&inopt.comments, &inopt.comments_length, "ENCODER", ENCODER_string);

  /*Process command-line options*/
  cline_size=0;
  while(1){
    int c;
    int save_cmd=1;
    c=getopt_long(argc_utf8, argv_utf8, "hV",
                  long_options, &option_index);
    if(c==-1)
       break;

    switch(c){
      case 0:
        if(strcmp(long_options[option_index].name,"quiet")==0){
          quiet=1;
        }else if(strcmp(long_options[option_index].name,"bitrate")==0){
          bitrate=atof(optarg)*1000.;
        }else if(strcmp(long_options[option_index].name,"hard-cbr")==0){
          with_hard_cbr=1;
          with_cvbr=0;
        }else if(strcmp(long_options[option_index].name,"cvbr")==0){
          with_cvbr=1;
          with_hard_cbr=0;
        }else if(strcmp(long_options[option_index].name,"vbr")==0){
          with_cvbr=0;
          with_hard_cbr=0;
        }else if(strcmp(long_options[option_index].name,"help")==0){
          usage();
          return 0;//exit(0);
        }else if(strcmp(long_options[option_index].name,"version")==0){
          opustoolsversion(opus_version);
          return 0;//exit(0);
        }else if(strcmp(long_options[option_index].name,"version-short")==0){
          opustoolsversion_short(opus_version);
          return 0;//exit(0);
        }else if(strcmp(long_options[option_index].name,"ignorelength")==0){
          inopt.ignorelength=1;
        }else if(strcmp(long_options[option_index].name,"raw")==0){
          inopt.rawmode=1;
          save_cmd=0;
        }else if(strcmp(long_options[option_index].name,"raw-bits")==0){
          inopt.rawmode=1;
          inopt.samplesize=atoi(optarg);
          save_cmd=0;
          if(inopt.samplesize!=8&&inopt.samplesize!=16&&inopt.samplesize!=24){
            fprintf(stderr,"Invalid bit-depth: %s\n",optarg);
            fprintf(stderr,"--raw-bits must be one of 8,16, or 24\n");
            return 0;//exit(1);
          }
        }else if(strcmp(long_options[option_index].name,"raw-rate")==0){
          inopt.rawmode=1;
          inopt.rate=atoi(optarg);
          save_cmd=0;
        }else if(strcmp(long_options[option_index].name,"raw-chan")==0){
          inopt.rawmode=1;
          inopt.channels=atoi(optarg);
          save_cmd=0;
        }else if(strcmp(long_options[option_index].name,"raw-endianness")==0){
          inopt.rawmode=1;
          inopt.endianness=atoi(optarg);
          save_cmd=0;
        }else if(strcmp(long_options[option_index].name,"downmix-mono")==0){
          downmix=1;
        }else if(strcmp(long_options[option_index].name,"downmix-stereo")==0){
          downmix=2;
        }else if(strcmp(long_options[option_index].name,"no-downmix")==0){
          downmix=-1;
        }else if(strcmp(long_options[option_index].name,"expect-loss")==0){
          expect_loss=atoi(optarg);
          if(expect_loss>100||expect_loss<0){
            fprintf(stderr,"Invalid expect-loss: %s\n",optarg);
            fprintf(stderr,"Expected loss is a percent and must be 0-100.\n");
            return 0;//exit(1);
          }
        }else if(strcmp(long_options[option_index].name,"comp")==0 ||
                 strcmp(long_options[option_index].name,"complexity")==0){
          complexity=atoi(optarg);
          if(complexity>10||complexity<0){
            fprintf(stderr,"Invalid complexity: %s\n",optarg);
            fprintf(stderr,"Complexity must be 0-10.\n");
            return 0;//exit(1);
          }
        }else if(strcmp(long_options[option_index].name,"framesize")==0){
          if(strcmp(optarg,"2.5")==0)frame_size=120;
          else if(strcmp(optarg,"5")==0)frame_size=240;
          else if(strcmp(optarg,"10")==0)frame_size=480;
          else if(strcmp(optarg,"20")==0)frame_size=960;
          else if(strcmp(optarg,"40")==0)frame_size=1920;
          else if(strcmp(optarg,"60")==0)frame_size=2880;
          else{
            fprintf(stderr,"Invalid framesize: %s\n",optarg);
            fprintf(stderr,"Framesize must be 2.5, 5, 10, 20, 40, or 60.\n");
            return 0;//exit(1);
          }
        }else if(strcmp(long_options[option_index].name,"max-delay")==0){
          max_ogg_delay=floor(atof(optarg)*48.);
          if(max_ogg_delay<0||max_ogg_delay>48000){
            fprintf(stderr,"Invalid max-delay: %s\n",optarg);
            fprintf(stderr,"max-delay 0-1000 ms.\n");
            return 0;//exit(1);
          }
        }else if(strcmp(long_options[option_index].name,"serial")==0){
          serialno=atoi(optarg);
        }else if(strcmp(long_options[option_index].name,"set-ctl-int")==0){
          int len=strlen(optarg),target;
          char *spos,*tpos;
          spos=strchr(optarg,'=');
          if(len<3||spos==NULL||(spos-optarg)<1||(spos-optarg)>=len){
            fprintf(stderr, "Invalid set-ctl-int: %s\n", optarg);
            fprintf(stderr, "Syntax is --set-ctl-int intX=intY or\n");
            fprintf(stderr, "Syntax is --set-ctl-int intS:intX=intY\n");
            return 0;//exit(1);
          }
          tpos=strchr(optarg,':');
          if(tpos==NULL){
            target=-1;
            tpos=optarg-1;
          }else target=atoi(optarg);
          if((atoi(tpos+1)&1)!=0){
            fprintf(stderr, "Invalid set-ctl-int: %s\n", optarg);
            fprintf(stderr, "libopus set CTL values are even.\n");
            return 0;//exit(1);
          }
          if(opt_ctls==0)opt_ctls_ctlval=malloc(sizeof(int)*3);
          else opt_ctls_ctlval=realloc(opt_ctls_ctlval,sizeof(int)*(opt_ctls+1)*3);
          opt_ctls_ctlval[opt_ctls*3]=target;
          opt_ctls_ctlval[opt_ctls*3+1]=atoi(tpos+1);
          opt_ctls_ctlval[opt_ctls*3+2]=atoi(spos+1);
          opt_ctls++;
        }else if(strcmp(long_options[option_index].name,"save-range")==0){
          frange=fopen_utf8(optarg,"w");
          save_cmd=0;
          if(frange==NULL){
            perror(optarg);
            fprintf(stderr,"Could not open save-range file: %s\n",optarg);
            fprintf(stderr,"Must provide a writable file name.\n");
            return 0;//exit(1);
          }
          range_file=optarg;
        }else if(strcmp(long_options[option_index].name,"comment")==0){
          save_cmd=0;
          if(!strchr(optarg,'=')){
            fprintf(stderr, "Invalid comment: %s\n", optarg);
            fprintf(stderr, "Comments must be of the form name=value\n");
            return 0;//exit(1);
          }
          comment_add(&inopt.comments, &inopt.comments_length, NULL, optarg);
        }else if(strcmp(long_options[option_index].name,"artist")==0){
          save_cmd=0;
          comment_add(&inopt.comments, &inopt.comments_length, "artist", optarg);
        } else if(strcmp(long_options[option_index].name,"title")==0){
          save_cmd=0;
          comment_add(&inopt.comments, &inopt.comments_length, "title", optarg);
        } else if(strcmp(long_options[option_index].name,"album")==0){
          save_cmd=0;
          comment_add(&inopt.comments, &inopt.comments_length, "album", optarg);
        } else if(strcmp(long_options[option_index].name,"date")==0){
          save_cmd=0;
          comment_add(&inopt.comments, &inopt.comments_length, "date", optarg);
        } else if(strcmp(long_options[option_index].name,"genre")==0){
          save_cmd=0;
          comment_add(&inopt.comments, &inopt.comments_length, "genre", optarg);
        } else if(strcmp(long_options[option_index].name,"picture")==0){
          const char *error_message;
          char       *picture_data;
          save_cmd=0;
          picture_data=parse_picture_specification(optarg,&error_message,
                                                   &seen_file_icons);
          if(picture_data==NULL){
            fprintf(stderr,"Error parsing picture option: %s\n",error_message);
            return 0;//exit(1);
          }
          comment_add(&inopt.comments,&inopt.comments_length,
                      "METADATA_BLOCK_PICTURE",picture_data);
          free(picture_data);
        } else if(strcmp(long_options[option_index].name,"padding")==0){
          comment_padding=atoi(optarg);
        } else if(strcmp(long_options[option_index].name,"discard-comments")==0){
          inopt.copy_comments=0;
          inopt.copy_pictures=0;
        } else if(strcmp(long_options[option_index].name,"discard-pictures")==0){
          inopt.copy_pictures=0;
        }
        /*Commands whos arguments would leak file paths or just end up as metadata
           should have save_cmd=0; to prevent them from being saved in the
           command-line tag.*/
        break;
      case 'h':
        usage();
        return 0;//exit(0);
        break;
      case 'V':
        opustoolsversion(opus_version);
        return 0;//exit(0);
        break;
      case '?':
        usage();
        return 0;//exit(1);
        break;
    }
    if(save_cmd && cline_size<(int)sizeof(ENCODER_string)){
      ret=snprintf(&ENCODER_string[cline_size], sizeof(ENCODER_string)-cline_size, "%s--%s",cline_size==0?"":" ",long_options[option_index].name);
      if(ret<0||ret>=((int)sizeof(ENCODER_string)-cline_size)){
        cline_size=sizeof(ENCODER_string);
      } else {
        cline_size+=ret;
        if(optarg){
          ret=snprintf(&ENCODER_string[cline_size], sizeof(ENCODER_string)-cline_size, " %s",optarg);
          if(ret<0||ret>=((int)sizeof(ENCODER_string)-cline_size)){
            cline_size=sizeof(ENCODER_string);
          } else {
            cline_size+=ret;
          }
        }
      }
    }
  }
  if(argc_utf8-optind!=2){
    usage();
    return 0;//exit(1);
  }
  inFile=argv_utf8[optind];
  outFile=argv_utf8[optind+1];

  if(cline_size>0)comment_add(&inopt.comments, &inopt.comments_length, "ENCODER_OPTIONS", ENCODER_string);

  if(strcmp(inFile, "-")==0){
#if defined WIN32 || defined _WIN32
    _setmode(_fileno(stdin), _O_BINARY);
#elif defined OS2
    _fsetmode(stdin,"b");
#endif
    fin=stdin;
  }else{
    fin=fopen_utf8(inFile, "rb");
    if(!fin){
      perror(inFile);
      return 0;//exit(1);
    }
  }

  if(inopt.rawmode){
    in_format = &raw_format;
    in_format->open_func(fin, &inopt, NULL, 0);
  }else in_format=open_audio_file(fin,&inopt);

  if(!in_format){
    fprintf(stderr,"Error parsing input file: %s\n",inFile);
    return 0;//exit(1);
  }

  if(downmix==0&&inopt.channels>2&&bitrate>0&&bitrate<(16000*inopt.channels)){
    if(!quiet)fprintf(stderr,"Notice: Surround bitrate less than 16kbit/sec/channel, downmixing.\n");
    downmix=inopt.channels>8?1:2;
  }

  if(downmix>0&&downmix<inopt.channels)downmix=setup_downmix(&inopt,downmix);
  else downmix=0;

  rate=inopt.rate;
  chan=inopt.channels;
  inopt.skip=0;

  /*In order to code the complete length we'll need to do a little padding*/
  setup_padder(&inopt,&original_samples);

  if(rate>24000)coding_rate=48000;
  else if(rate>16000)coding_rate=24000;
  else if(rate>12000)coding_rate=16000;
  else if(rate>8000)coding_rate=12000;
  else coding_rate=8000;

  frame_size=frame_size/(48000/coding_rate);

  /*Scale the resampler complexity, but only for 48000 output because
    the near-cutoff behavior matters a lot more at lower rates.*/
  //if(rate!=coding_rate)setup_resample(&inopt,coding_rate==48000?(complexity+1)/2:5,coding_rate);

  if(rate!=coding_rate&&complexity!=10&&!quiet){
    fprintf(stderr,"Notice: Using resampling with complexity<10.\n");
    fprintf(stderr,"Opusenc is fastest with 48, 24, 16, 12, or 8kHz input.\n\n");
  }

  /*OggOpus headers*/ /*FIXME: broke forcemono*/
  header.channels=chan;
  header.channel_mapping=header.channels>8?255:chan>2;
  header.input_sample_rate=rate;
  header.gain=inopt.gain;

  /*Initialize OPUS encoder*/
  /*Framesizes <10ms can only use the MDCT modes, so we switch on RESTRICTED_LOWDELAY
    to save the extra 2.5ms of codec lookahead when we'll be using only small frames.*/
  st=opus_multistream_surround_encoder_create(coding_rate, chan, header.channel_mapping, &header.nb_streams, &header.nb_coupled,
     header.stream_map, frame_size<480/(48000/coding_rate)?OPUS_APPLICATION_RESTRICTED_LOWDELAY:OPUS_APPLICATION_AUDIO, &ret);
  if(ret!=OPUS_OK){
    fprintf(stderr, "Error cannot create encoder: %s\n", opus_strerror(ret));
    return 0;//exit(1);
  }

  min_bytes=max_frame_bytes=(1275*3+7)*header.nb_streams;
  packet=malloc(sizeof(unsigned char)*max_frame_bytes);
  if(packet==NULL){
    fprintf(stderr,"Error allocating packet buffer.\n");
    return 0;//exit(1);
  }

  if(bitrate<0){
    /*Lower default rate for sampling rates [8000-44100) by a factor of (rate+16k)/(64k)*/
    bitrate=((64000*header.nb_streams+32000*header.nb_coupled)*
             (IMIN(48,IMAX(8,((rate<44100?rate:48000)+1000)/1000))+16)+32)>>6;
  }
示例#2
0
int convert( const char* source_path, const char* target_path, int bitRate, int quality) {
	static const input_format raw_format = {NULL, 0, raw_open, wav_close, "raw",N_("RAW file reader")};
	int i, ret;
	int                cline_size;
	OpusMSEncoder      *st;
	const char         *opus_version;
	unsigned char      *packet;
#ifdef FIXED_POINT
	opus_int16         *input;
#else
	float              *input;
#endif
	/*I/O*/
	oe_enc_opt         inopt;
	const input_format *in_format;
	char               *range_file;
	FILE               *fin;
	FILE               *fout;
	FILE               *frange;
	ogg_stream_state   os;
	ogg_page           og;
	ogg_packet         op;
	ogg_int64_t        last_granulepos=0;
	ogg_int64_t        enc_granulepos=0;
	ogg_int64_t        original_samples=0;
	ogg_int32_t        id=-1;
	int                last_segments=0;
	int                eos=0;
	OpusHeader         header;
	char               ENCODER_string[1024];
	/*Counters*/
	opus_int64         nb_encoded=0;
	opus_int64         bytes_written=0;
	opus_int64         pages_out=0;
	opus_int64         total_bytes=0;
	opus_int64         total_samples=0;
	opus_int32         nbBytes;
	opus_int32         nb_samples;
	opus_int32         peak_bytes=0;
	opus_int32         min_bytes;
	time_t             start_time;
	time_t             stop_time;
	time_t             last_spin=0;
	int                last_spin_len=0;
	/*Settings*/
	int                quiet=0;
	int                max_frame_bytes;
	opus_int32         bitrate=bitRate * 1000;
	opus_int32         rate=48000;
	opus_int32         coding_rate=48000;
	opus_int32         frame_size=960;
	int                chan=2;
	int                with_hard_cbr=0;
	int                with_cvbr=0;
	int                expect_loss=0;
	int                complexity=10 - quality;	// 10 -- best
	int                downmix=0;
	int                *opt_ctls_ctlval;
	int                opt_ctls=0;
	int                max_ogg_delay=48000; // 48kHz samples
	int                seen_file_icons=0;
	int                comment_padding=512;
	int                serialno;
	opus_int32         lookahead=0;

	opt_ctls_ctlval=NULL;
	frange=NULL;
	range_file=NULL;
	in_format=NULL;
	inopt.channels=chan;
	inopt.rate=coding_rate=rate;
	// 0 dB gain is recommended unless you know what you're doing
	inopt.gain=0;
	inopt.samplesize=16;
	inopt.endianness=0;
	inopt.rawmode=0;
	inopt.ignorelength=0;
	inopt.copy_comments=1;

	start_time = time(NULL);
	srand(((getpid()&65535)<<15)^start_time);
	serialno=rand();

	opus_version= "libopus 1.1.1";	//opus_get_version_string();
	// Vendor string should just be the encoder library, the ENCODER comment specifies the tool used.
	if( comment_init(&inopt.comments, &inopt.comments_length, opus_version) ) {
		return 1;	// failed
	}
	snprintf(ENCODER_string, sizeof(ENCODER_string), "%s %s",PACKAGE_NAME,PACKAGE_VERSION);
	if( comment_add(&inopt.comments, &inopt.comments_length, "ENCODER", ENCODER_string) ) {
		return 1;	// failed
	}

	if(cline_size>0){
		if( comment_add(&inopt.comments, &inopt.comments_length, "ENCODER_OPTIONS", ENCODER_string) ) {
			return 1;	// failed
		}
	}

	fin=fopen_utf8(source_path, "rb");
	if(!fin){
		perror(source_path);
		return 1;
	}

	if(inopt.rawmode){
		in_format = &raw_format;
		in_format->open_func(fin, &inopt, NULL, 0);
	}else in_format=open_audio_file(fin,&inopt);

	if(!in_format){
		LOGD("Error parsing input file: %s\n",source_path);
		return 1;
	}

	if(downmix==0&&inopt.channels>2&&bitrate>0&&bitrate<(16000*inopt.channels)){
		if(!quiet)LOGD("Notice: Surround bitrate less than 16kbit/sec/channel, downmixing.\n");
		downmix=inopt.channels>8?1:2;
	}

	if(downmix>0&&downmix<inopt.channels)downmix=setup_downmix(&inopt,downmix);
	else downmix=0;

	rate=inopt.rate;
	chan=inopt.channels;
	inopt.skip=0;

	// In order to code the complete length we'll need to do a little padding
	setup_padder(&inopt,&original_samples);

	if(rate>24000)coding_rate=48000;
	else if(rate>16000)coding_rate=24000;
	else if(rate>12000)coding_rate=16000;
	else if(rate>8000)coding_rate=12000;
	else coding_rate=8000;

	frame_size=frame_size/(48000/coding_rate);

	// Scale the resampler complexity, but only for 48000 output because
    // the near-cutoff behavior matters a lot more at lower rates.
//	if(rate!=coding_rate)setup_resample(&inopt,coding_rate==48000?(complexity+1)/2:5,coding_rate);

	if(rate!=coding_rate&&complexity!=10&&!quiet){
		LOGD("Notice: Using resampling with complexity<10.\n");
		LOGD("Opusenc is fastest with 48, 24, 16, 12, or 8kHz input.\n\n");
	}

	// OggOpus headers // FIXME: broke forcemono
	header.channels=chan;
	header.channel_mapping=header.channels>8?255:chan>2;
	header.input_sample_rate=rate;
	header.gain=inopt.gain;

	// Initialize OPUS encoder
	st=opus_multistream_surround_encoder_create(coding_rate, chan, header.channel_mapping, &header.nb_streams, &header.nb_coupled,
			header.stream_map, OPUS_APPLICATION_AUDIO, &ret);
	if(ret!=OPUS_OK){
		LOGD( "Error cannot create encoder: %s\n", opus_strerror(ret));
		return 1;
	}

	min_bytes=max_frame_bytes=(1275*3+7)*header.nb_streams;
	packet=malloc(sizeof(unsigned char)*max_frame_bytes);
	if(packet==NULL){
		LOGD("Error allocating packet buffer.\n");
		return 1;
	}

	if(bitrate<0){
		// Lower default rate for sampling rates [8000-44100) by a factor of (rate+16k)/(64k)
		bitrate=((64000*header.nb_streams+32000*header.nb_coupled)*
				(IMIN(48,IMAX(8,((rate<44100?rate:48000)+1000)/1000))+16)+32)>>6;
	}