text: /* Copyright (c) 2010-2011 Xiph.Org Foundation, Skype Limited
     Written by Jean-Marc Valin and Koen Vos */
  /*
     Redistribution and use in source and binary forms, with or without
     modification, are permitted provided that the following conditions
     are met:
  
     - Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
  
     - Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.
  
     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
     OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
  
  /**
   * @file opus_defines.h
   * @brief Opus reference implementation constants
   */
  
  #ifndef OPUS_DEFINES_H
  #define OPUS_DEFINES_H
  
  #include "opus_types.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /** @defgroup opus_errorcodes Error codes
   * @{
   */
  /** No error @hideinitializer*/
  #define OPUS_OK                0
  /** One or more invalid/out of range arguments @hideinitializer*/
  #define OPUS_BAD_ARG          -1
  /** The mode struct passed is invalid @hideinitializer*/
  #define OPUS_BUFFER_TOO_SMALL -2
  /** An internal error was detected @hideinitializer*/
  #define OPUS_INTERNAL_ERROR   -3
  /** The compressed data passed is corrupted @hideinitializer*/
  #define OPUS_INVALID_PACKET   -4
  /** Invalid/unsupported request number @hideinitializer*/
  #define OPUS_UNIMPLEMENTED    -5
  /** An encoder or decoder structure is invalid or already freed @hideinitializer*/
  #define OPUS_INVALID_STATE    -6
  /** Memory allocation has failed @hideinitializer*/
  #define OPUS_ALLOC_FAIL       -7
  /**@}*/
  
  /** @cond OPUS_INTERNAL_DOC */
  /**Export control for opus functions */
  
  #ifndef OPUS_EXPORT
  # if defined(__GNUC__) && defined(OPUS_BUILD)
  #  define OPUS_EXPORT __attribute__ ((visibility ("default")))
  # elif defined(WIN32) && !defined(__MINGW32__)
  #  ifdef OPUS_BUILD
  #   define OPUS_EXPORT __declspec(dllexport)
  #  else
  #   define OPUS_EXPORT
  #  endif
  # else
  #  define OPUS_EXPORT
  # endif
  #endif
  
  # if !defined(OPUS_GNUC_PREREQ)
  #  if defined(__GNUC__)&&defined(__GNUC_MINOR__)
  #   define OPUS_GNUC_PREREQ(_maj,_min) \
   ((__GNUC__<<16)+__GNUC_MINOR__>=((_maj)<<16)+(_min))
  #  else
  #   define OPUS_GNUC_PREREQ(_maj,_min) 0
  #  endif
  # endif
  
  #if (!defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L) )
  # if OPUS_GNUC_PREREQ(3,0)
  #  define OPUS_RESTRICT __restrict__
  # elif (defined(_MSC_VER) && _MSC_VER >= 1400)
  #  define OPUS_RESTRICT __restrict
  # else
  #  define OPUS_RESTRICT
  # endif
  #else
  # define OPUS_RESTRICT restrict
  #endif
  
  /**Warning attributes for opus functions
    * NONNULL is not used in OPUS_BUILD to avoid the compiler optimizing out
    * some paranoid null checks. */
  #if defined(__GNUC__) && OPUS_GNUC_PREREQ(3, 4)
  # define OPUS_WARN_UNUSED_RESULT __attribute__ ((__warn_unused_result__))
  #else
  # define OPUS_WARN_UNUSED_RESULT
  #endif
  #if !defined(OPUS_BUILD) && defined(__GNUC__) && OPUS_GNUC_PREREQ(3, 4)
  # define OPUS_ARG_NONNULL(_x)  __attribute__ ((__nonnull__(_x)))
  #else
  # define OPUS_ARG_NONNULL(_x)
  #endif
  
  /** These are the actual Encoder CTL ID numbers.
    * They should not be used directly by applications.
    * In general, SETs should be even and GETs should be odd.*/
  #define OPUS_SET_APPLICATION_REQUEST         4000
  #define OPUS_GET_APPLICATION_REQUEST         4001
  #define OPUS_SET_BITRATE_REQUEST             4002
  #define OPUS_GET_BITRATE_REQUEST             4003
  #define OPUS_SET_MAX_BANDWIDTH_REQUEST       4004
  #define OPUS_GET_MAX_BANDWIDTH_REQUEST       4005
  #define OPUS_SET_VBR_REQUEST                 4006
  #define OPUS_GET_VBR_REQUEST                 4007
  #define OPUS_SET_BANDWIDTH_REQUEST           4008
  #define OPUS_GET_BANDWIDTH_REQUEST           4009
  #define OPUS_SET_COMPLEXITY_REQUEST          4010
  #define OPUS_GET_COMPLEXITY_REQUEST          4011
  #define OPUS_SET_INBAND_FEC_REQUEST          4012
  #define OPUS_GET_INBAND_FEC_REQUEST          4013
  #define OPUS_SET_PACKET_LOSS_PERC_REQUEST    4014
  #define OPUS_GET_PACKET_LOSS_PERC_REQUEST    4015
  #define OPUS_SET_DTX_REQUEST                 4016
  #define OPUS_GET_DTX_REQUEST                 4017
  #define OPUS_SET_VBR_CONSTRAINT_REQUEST      4020
  #define OPUS_GET_VBR_CONSTRAINT_REQUEST      4021
  #define OPUS_SET_FORCE_CHANNELS_REQUEST      4022
  #define OPUS_GET_FORCE_CHANNELS_REQUEST      4023
  #define OPUS_SET_SIGNAL_REQUEST              4024
  #define OPUS_GET_SIGNAL_REQUEST              4025
  #define OPUS_GET_LOOKAHEAD_REQUEST           4027
  /* #define OPUS_RESET_STATE 4028 */
  #define OPUS_GET_SAMPLE_RATE_REQUEST         4029
  #define OPUS_GET_FINAL_RANGE_REQUEST         4031
  #define OPUS_GET_PITCH_REQUEST               4033
  #define OPUS_SET_GAIN_REQUEST                4034
  #define OPUS_GET_GAIN_REQUEST                4045 /* Should have been 4035 */
  #define OPUS_SET_LSB_DEPTH_REQUEST           4036
  #define OPUS_GET_LSB_DEPTH_REQUEST           4037
  
  #define OPUS_GET_LAST_PACKET_DURATION_REQUEST 4039
  
  /* Don't use 4045, it's already taken by OPUS_GET_GAIN_REQUEST */
  
  /* Macros to trigger compilation errors when the wrong types are provided to a CTL */
  #define __opus_check_int(x) (((void)((x) == (opus_int32)0)), (opus_int32)(x))
  #define __opus_check_int_ptr(ptr) ((ptr) + ((ptr) - (opus_int32*)(ptr)))
  #define __opus_check_uint_ptr(ptr) ((ptr) + ((ptr) - (opus_uint32*)(ptr)))
  /** @endcond */
  
  /** @defgroup opus_ctlvalues Pre-defined values for CTL interface
    * @see opus_genericctls, opus_encoderctls
    * @{
    */
  /* Values for the various encoder CTLs */
  #define OPUS_AUTO                           -1000 /**<Auto/default setting @hideinitializer*/
  #define OPUS_BITRATE_MAX                       -1 /**<Maximum bitrate @hideinitializer*/
  
  /** Best for most VoIP/videoconference applications where listening quality and intelligibility matter most
   * @hideinitializer */
  #define OPUS_APPLICATION_VOIP                2048
  /** Best for broadcast/high-fidelity application where the decoded audio should be as close as possible to the input
   * @hideinitializer */
  #define OPUS_APPLICATION_AUDIO               2049
  /** Only use when lowest-achievable latency is what matters most. Voice-optimized modes cannot be used.
   * @hideinitializer */
  #define OPUS_APPLICATION_RESTRICTED_LOWDELAY 2051
  
  #define OPUS_SIGNAL_VOICE                    3001 /**< Signal being encoded is voice */
  #define OPUS_SIGNAL_MUSIC                    3002 /**< Signal being encoded is music */
  #define OPUS_BANDWIDTH_NARROWBAND            1101 /**< 4 kHz bandpass @hideinitializer*/
  #define OPUS_BANDWIDTH_MEDIUMBAND            1102 /**< 6 kHz bandpass @hideinitializer*/
  #define OPUS_BANDWIDTH_WIDEBAND              1103 /**< 8 kHz bandpass @hideinitializer*/
  #define OPUS_BANDWIDTH_SUPERWIDEBAND         1104 /**<12 kHz bandpass @hideinitializer*/
  #define OPUS_BANDWIDTH_FULLBAND              1105 /**<20 kHz bandpass @hideinitializer*/
  
  /**@}*/
  
  
  /** @defgroup opus_encoderctls Encoder related CTLs
    *
    * These are convenience macros for use with the \c opus_encode_ctl
    * interface. They are used to generate the appropriate series of
    * arguments for that call, passing the correct type, size and so
    * on as expected for each particular request.
    *
    * Some usage examples:
    *
    * @code
    * int ret;
    * ret = opus_encoder_ctl(enc_ctx, OPUS_SET_BANDWIDTH(OPUS_AUTO));
    * if (ret != OPUS_OK) return ret;
    *
    * opus_int32 rate;
    * opus_encoder_ctl(enc_ctx, OPUS_GET_BANDWIDTH(&rate));
    *
    * opus_encoder_ctl(enc_ctx, OPUS_RESET_STATE);
    * @endcode
    *
    * @see opus_genericctls, opus_encoder
    * @{
    */
  
  /** Configures the encoder's computational complexity.
    * The supported range is 0-10 inclusive with 10 representing the highest complexity.
    * @see OPUS_GET_COMPLEXITY
    * @param[in] x <tt>opus_int32</tt>: Allowed values: 0-10, inclusive.
    *
    * @hideinitializer */
  #define OPUS_SET_COMPLEXITY(x) OPUS_SET_COMPLEXITY_REQUEST, __opus_check_int(x)
  /** Gets the encoder's complexity configuration.
    * @see OPUS_SET_COMPLEXITY
    * @param[out] x <tt>opus_int32 *</tt>: Returns a value in the range 0-10,
    *                                      inclusive.
    * @hideinitializer */
  #define OPUS_GET_COMPLEXITY(x) OPUS_GET_COMPLEXITY_REQUEST, __opus_check_int_ptr(x)
  
  /** Configures the bitrate in the encoder.
    * Rates from 500 to 512000 bits per second are meaningful, as well as the
    * special values #OPUS_AUTO and #OPUS_BITRATE_MAX.
    * The value #OPUS_BITRATE_MAX can be used to cause the codec to use as much
    * rate as it can, which is useful for controlling the rate by adjusting the
    * output buffer size.
    * @see OPUS_GET_BITRATE
    * @param[in] x <tt>opus_int32</tt>: Bitrate in bits per second. The default
    *                                   is determined based on the number of
    *                                   channels and the input sampling rate.
    * @hideinitializer */
  #define OPUS_SET_BITRATE(x) OPUS_SET_BITRATE_REQUEST, __opus_check_int(x)
  /** Gets the encoder's bitrate configuration.
    * @see OPUS_SET_BITRATE
    * @param[out] x <tt>opus_int32 *</tt>: Returns the bitrate in bits per second.
    *                                      The default is determined based on the
    *                                      number of channels and the input
    *                                      sampling rate.
    * @hideinitializer */
  #define OPUS_GET_BITRATE(x) OPUS_GET_BITRATE_REQUEST, __opus_check_int_ptr(x)
  
  /** Enables or disables variable bitrate (VBR) in the encoder.
    * The configured bitrate may not be met exactly because frames must
    * be an integer number of bytes in length.
    * @warning Only the MDCT mode of Opus can provide hard CBR behavior.
    * @see OPUS_GET_VBR
    * @see OPUS_SET_VBR_CONSTRAINT
    * @param[in] x <tt>opus_int32</tt>: Allowed values:
    * <dl>
    * <dt>0</dt><dd>Hard CBR. For LPC/hybrid modes at very low bit-rate, this can
    *               cause noticeable quality degradation.</dd>
    * <dt>1</dt><dd>VBR (default). The exact type of VBR is controlled by
    *               #OPUS_SET_VBR_CONSTRAINT.</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_SET_VBR(x) OPUS_SET_VBR_REQUEST, __opus_check_int(x)
  /** Determine if variable bitrate (VBR) is enabled in the encoder.
    * @see OPUS_SET_VBR
    * @see OPUS_GET_VBR_CONSTRAINT
    * @param[out] x <tt>opus_int32 *</tt>: Returns one of the following values:
    * <dl>
    * <dt>0</dt><dd>Hard CBR.</dd>
    * <dt>1</dt><dd>VBR (default). The exact type of VBR may be retrieved via
    *               #OPUS_GET_VBR_CONSTRAINT.</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_GET_VBR(x) OPUS_GET_VBR_REQUEST, __opus_check_int_ptr(x)
  
  /** Enables or disables constrained VBR in the encoder.
    * This setting is ignored when the encoder is in CBR mode.
    * @warning Only the MDCT mode of Opus currently heeds the constraint.
    *  Speech mode ignores it completely, hybrid mode may fail to obey it
    *  if the LPC layer uses more bitrate than the constraint would have
    *  permitted.
    * @see OPUS_GET_VBR_CONSTRAINT
    * @see OPUS_SET_VBR
    * @param[in] x <tt>opus_int32</tt>: Allowed values:
    * <dl>
    * <dt>0</dt><dd>Unconstrained VBR.</dd>
    * <dt>1</dt><dd>Constrained VBR (default). This creates a maximum of one
    *               frame of buffering delay assuming a transport with a
    *               serialization speed of the nominal bitrate.</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_SET_VBR_CONSTRAINT(x) OPUS_SET_VBR_CONSTRAINT_REQUEST, __opus_check_int(x)
  /** Determine if constrained VBR is enabled in the encoder.
    * @see OPUS_SET_VBR_CONSTRAINT
    * @see OPUS_GET_VBR
    * @param[out] x <tt>opus_int32 *</tt>: Returns one of the following values:
    * <dl>
    * <dt>0</dt><dd>Unconstrained VBR.</dd>
    * <dt>1</dt><dd>Constrained VBR (default).</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_GET_VBR_CONSTRAINT(x) OPUS_GET_VBR_CONSTRAINT_REQUEST, __opus_check_int_ptr(x)
  
  /** Configures mono/stereo forcing in the encoder.
    * This can force the encoder to produce packets encoded as either mono or
    * stereo, regardless of the format of the input audio. This is useful when
    * the caller knows that the input signal is currently a mono source embedded
    * in a stereo stream.
    * @see OPUS_GET_FORCE_CHANNELS
    * @param[in] x <tt>opus_int32</tt>: Allowed values:
    * <dl>
    * <dt>#OPUS_AUTO</dt><dd>Not forced (default)</dd>
    * <dt>1</dt>         <dd>Forced mono</dd>
    * <dt>2</dt>         <dd>Forced stereo</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_SET_FORCE_CHANNELS(x) OPUS_SET_FORCE_CHANNELS_REQUEST, __opus_check_int(x)
  /** Gets the encoder's forced channel configuration.
    * @see OPUS_SET_FORCE_CHANNELS
    * @param[out] x <tt>opus_int32 *</tt>:
    * <dl>
    * <dt>#OPUS_AUTO</dt><dd>Not forced (default)</dd>
    * <dt>1</dt>         <dd>Forced mono</dd>
    * <dt>2</dt>         <dd>Forced stereo</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_GET_FORCE_CHANNELS(x) OPUS_GET_FORCE_CHANNELS_REQUEST, __opus_check_int_ptr(x)
  
  /** Configures the maximum bandpass that the encoder will select automatically.
    * Applications should normally use this instead of #OPUS_SET_BANDWIDTH
    * (leaving that set to the default, #OPUS_AUTO). This allows the
    * application to set an upper bound based on the type of input it is
    * providing, but still gives the encoder the freedom to reduce the bandpass
    * when the bitrate becomes too low, for better overall quality.
    * @see OPUS_GET_MAX_BANDWIDTH
    * @param[in] x <tt>opus_int32</tt>: Allowed values:
    * <dl>
    * <dt>OPUS_BANDWIDTH_NARROWBAND</dt>    <dd>4 kHz passband</dd>
    * <dt>OPUS_BANDWIDTH_MEDIUMBAND</dt>    <dd>6 kHz passband</dd>
    * <dt>OPUS_BANDWIDTH_WIDEBAND</dt>      <dd>8 kHz passband</dd>
    * <dt>OPUS_BANDWIDTH_SUPERWIDEBAND</dt><dd>12 kHz passband</dd>
    * <dt>OPUS_BANDWIDTH_FULLBAND</dt>     <dd>20 kHz passband (default)</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_SET_MAX_BANDWIDTH(x) OPUS_SET_MAX_BANDWIDTH_REQUEST, __opus_check_int(x)
  
  /** Gets the encoder's configured maximum allowed bandpass.
    * @see OPUS_SET_MAX_BANDWIDTH
    * @param[out] x <tt>opus_int32 *</tt>: Allowed values:
    * <dl>
    * <dt>#OPUS_BANDWIDTH_NARROWBAND</dt>    <dd>4 kHz passband</dd>
    * <dt>#OPUS_BANDWIDTH_MEDIUMBAND</dt>    <dd>6 kHz passband</dd>
    * <dt>#OPUS_BANDWIDTH_WIDEBAND</dt>      <dd>8 kHz passband</dd>
    * <dt>#OPUS_BANDWIDTH_SUPERWIDEBAND</dt><dd>12 kHz passband</dd>
    * <dt>#OPUS_BANDWIDTH_FULLBAND</dt>     <dd>20 kHz passband (default)</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_GET_MAX_BANDWIDTH(x) OPUS_GET_MAX_BANDWIDTH_REQUEST, __opus_check_int_ptr(x)
  
  /** Sets the encoder's bandpass to a specific value.
    * This prevents the encoder from automatically selecting the bandpass based
    * on the available bitrate. If an application knows the bandpass of the input
    * audio it is providing, it should normally use #OPUS_SET_MAX_BANDWIDTH
    * instead, which still gives the encoder the freedom to reduce the bandpass
    * when the bitrate becomes too low, for better overall quality.
    * @see OPUS_GET_BANDWIDTH
    * @param[in] x <tt>opus_int32</tt>: Allowed values:
    * <dl>
    * <dt>#OPUS_AUTO</dt>                    <dd>(default)</dd>
    * <dt>#OPUS_BANDWIDTH_NARROWBAND</dt>    <dd>4 kHz passband</dd>
    * <dt>#OPUS_BANDWIDTH_MEDIUMBAND</dt>    <dd>6 kHz passband</dd>
    * <dt>#OPUS_BANDWIDTH_WIDEBAND</dt>      <dd>8 kHz passband</dd>
    * <dt>#OPUS_BANDWIDTH_SUPERWIDEBAND</dt><dd>12 kHz passband</dd>
    * <dt>#OPUS_BANDWIDTH_FULLBAND</dt>     <dd>20 kHz passband</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_SET_BANDWIDTH(x) OPUS_SET_BANDWIDTH_REQUEST, __opus_check_int(x)
  
  /** Configures the type of signal being encoded.
    * This is a hint which helps the encoder's mode selection.
    * @see OPUS_GET_SIGNAL
    * @param[in] x <tt>opus_int32</tt>: Allowed values:
    * <dl>
    * <dt>#OPUS_AUTO</dt>        <dd>(default)</dd>
    * <dt>#OPUS_SIGNAL_VOICE</dt><dd>Bias thresholds towards choosing LPC or Hybrid modes.</dd>
    * <dt>#OPUS_SIGNAL_MUSIC</dt><dd>Bias thresholds towards choosing MDCT modes.</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_SET_SIGNAL(x) OPUS_SET_SIGNAL_REQUEST, __opus_check_int(x)
  /** Gets the encoder's configured signal type.
    * @see OPUS_SET_SIGNAL
    * @param[out] x <tt>opus_int32 *</tt>: Returns one of the following values:
    * <dl>
    * <dt>#OPUS_AUTO</dt>        <dd>(default)</dd>
    * <dt>#OPUS_SIGNAL_VOICE</dt><dd>Bias thresholds towards choosing LPC or Hybrid modes.</dd>
    * <dt>#OPUS_SIGNAL_MUSIC</dt><dd>Bias thresholds towards choosing MDCT modes.</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_GET_SIGNAL(x) OPUS_GET_SIGNAL_REQUEST, __opus_check_int_ptr(x)
  
  
  /** Configures the encoder's intended application.
    * The initial value is a mandatory argument to the encoder_create function.
    * @see OPUS_GET_APPLICATION
    * @param[in] x <tt>opus_int32</tt>: Returns one of the following values:
    * <dl>
    * <dt>#OPUS_APPLICATION_VOIP</dt>
    * <dd>Process signal for improved speech intelligibility.</dd>
    * <dt>#OPUS_APPLICATION_AUDIO</dt>
    * <dd>Favor faithfulness to the original input.</dd>
    * <dt>#OPUS_APPLICATION_RESTRICTED_LOWDELAY</dt>
    * <dd>Configure the minimum possible coding delay by disabling certain modes
    * of operation.</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_SET_APPLICATION(x) OPUS_SET_APPLICATION_REQUEST, __opus_check_int(x)
  /** Gets the encoder's configured application.
    * @see OPUS_SET_APPLICATION
    * @param[out] x <tt>opus_int32 *</tt>: Returns one of the following values:
    * <dl>
    * <dt>#OPUS_APPLICATION_VOIP</dt>
    * <dd>Process signal for improved speech intelligibility.</dd>
    * <dt>#OPUS_APPLICATION_AUDIO</dt>
    * <dd>Favor faithfulness to the original input.</dd>
    * <dt>#OPUS_APPLICATION_RESTRICTED_LOWDELAY</dt>
    * <dd>Configure the minimum possible coding delay by disabling certain modes
    * of operation.</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_GET_APPLICATION(x) OPUS_GET_APPLICATION_REQUEST, __opus_check_int_ptr(x)
  
  /** Gets the sampling rate the encoder or decoder was initialized with.
    * This simply returns the <code>Fs</code> value passed to opus_encoder_init()
    * or opus_decoder_init().
    * @param[out] x <tt>opus_int32 *</tt>: Sampling rate of encoder or decoder.
    * @hideinitializer
    */
  #define OPUS_GET_SAMPLE_RATE(x) OPUS_GET_SAMPLE_RATE_REQUEST, __opus_check_int_ptr(x)
  
  /** Gets the total samples of delay added by the entire codec.
    * This can be queried by the encoder and then the provided number of samples can be
    * skipped on from the start of the decoder's output to provide time aligned input
    * and output. From the perspective of a decoding application the real data begins this many
    * samples late.
    *
    * The decoder contribution to this delay is identical for all decoders, but the
    * encoder portion of the delay may vary from implementation to implementation,
    * version to version, or even depend on the encoder's initial configuration.
    * Applications needing delay compensation should call this CTL rather than
    * hard-coding a value.
    * @param[out] x <tt>opus_int32 *</tt>:   Number of lookahead samples
    * @hideinitializer */
  #define OPUS_GET_LOOKAHEAD(x) OPUS_GET_LOOKAHEAD_REQUEST, __opus_check_int_ptr(x)
  
  /** Configures the encoder's use of inband forward error correction (FEC).
    * @note This is only applicable to the LPC layer
    * @see OPUS_GET_INBAND_FEC
    * @param[in] x <tt>opus_int32</tt>: Allowed values:
    * <dl>
    * <dt>0</dt><dd>Disable inband FEC (default).</dd>
    * <dt>1</dt><dd>Enable inband FEC.</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_SET_INBAND_FEC(x) OPUS_SET_INBAND_FEC_REQUEST, __opus_check_int(x)
  /** Gets encoder's configured use of inband forward error correction.
    * @see OPUS_SET_INBAND_FEC
    * @param[out] x <tt>opus_int32 *</tt>: Returns one of the following values:
    * <dl>
    * <dt>0</dt><dd>Inband FEC disabled (default).</dd>
    * <dt>1</dt><dd>Inband FEC enabled.</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_GET_INBAND_FEC(x) OPUS_GET_INBAND_FEC_REQUEST, __opus_check_int_ptr(x)
  
  /** Configures the encoder's expected packet loss percentage.
    * Higher values with trigger progressively more loss resistant behavior in the encoder
    * at the expense of quality at a given bitrate in the lossless case, but greater quality
    * under loss.
    * @see OPUS_GET_PACKET_LOSS_PERC
    * @param[in] x <tt>opus_int32</tt>:   Loss percentage in the range 0-100, inclusive (default: 0).
    * @hideinitializer */
  #define OPUS_SET_PACKET_LOSS_PERC(x) OPUS_SET_PACKET_LOSS_PERC_REQUEST, __opus_check_int(x)
  /** Gets the encoder's configured packet loss percentage.
    * @see OPUS_SET_PACKET_LOSS_PERC
    * @param[out] x <tt>opus_int32 *</tt>: Returns the configured loss percentage
    *                                      in the range 0-100, inclusive (default: 0).
    * @hideinitializer */
  #define OPUS_GET_PACKET_LOSS_PERC(x) OPUS_GET_PACKET_LOSS_PERC_REQUEST, __opus_check_int_ptr(x)
  
  /** Configures the encoder's use of discontinuous transmission (DTX).
    * @note This is only applicable to the LPC layer
    * @see OPUS_GET_DTX
    * @param[in] x <tt>opus_int32</tt>: Allowed values:
    * <dl>
    * <dt>0</dt><dd>Disable DTX (default).</dd>
    * <dt>1</dt><dd>Enabled DTX.</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_SET_DTX(x) OPUS_SET_DTX_REQUEST, __opus_check_int(x)
  /** Gets encoder's configured use of discontinuous transmission.
    * @see OPUS_SET_DTX
    * @param[out] x <tt>opus_int32 *</tt>: Returns one of the following values:
    * <dl>
    * <dt>0</dt><dd>DTX disabled (default).</dd>
    * <dt>1</dt><dd>DTX enabled.</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_GET_DTX(x) OPUS_GET_DTX_REQUEST, __opus_check_int_ptr(x)
  /** Configures the depth of signal being encoded.
    * This is a hint which helps the encoder identify silence and near-silence.
    * @see OPUS_GET_LSB_DEPTH
    * @param[in] x <tt>opus_int32</tt>: Input precision in bits, between 8 and 24
    *                                   (default: 24).
    * @hideinitializer */
  #define OPUS_SET_LSB_DEPTH(x) OPUS_SET_LSB_DEPTH_REQUEST, __opus_check_int(x)
  /** Gets the encoder's configured signal depth.
    * @see OPUS_SET_LSB_DEPTH
    * @param[out] x <tt>opus_int32 *</tt>: Input precision in bits, between 8 and
    *                                      24 (default: 24).
    * @hideinitializer */
  #define OPUS_GET_LSB_DEPTH(x) OPUS_GET_LSB_DEPTH_REQUEST, __opus_check_int_ptr(x)
  
  /** Gets the duration (in samples) of the last packet successfully decoded or concealed.
    * @param[out] x <tt>opus_int32 *</tt>: Number of samples (at current sampling rate).
    * @hideinitializer */
  #define OPUS_GET_LAST_PACKET_DURATION(x) OPUS_GET_LAST_PACKET_DURATION_REQUEST, __opus_check_int_ptr(x)
  /**@}*/
  
  /** @defgroup opus_genericctls Generic CTLs
    *
    * These macros are used with the \c opus_decoder_ctl and
    * \c opus_encoder_ctl calls to generate a particular
    * request.
    *
    * When called on an \c OpusDecoder they apply to that
    * particular decoder instance. When called on an
    * \c OpusEncoder they apply to the corresponding setting
    * on that encoder instance, if present.
    *
    * Some usage examples:
    *
    * @code
    * int ret;
    * opus_int32 pitch;
    * ret = opus_decoder_ctl(dec_ctx, OPUS_GET_PITCH(&pitch));
    * if (ret == OPUS_OK) return ret;
    *
    * opus_encoder_ctl(enc_ctx, OPUS_RESET_STATE);
    * opus_decoder_ctl(dec_ctx, OPUS_RESET_STATE);
    *
    * opus_int32 enc_bw, dec_bw;
    * opus_encoder_ctl(enc_ctx, OPUS_GET_BANDWIDTH(&enc_bw));
    * opus_decoder_ctl(dec_ctx, OPUS_GET_BANDWIDTH(&dec_bw));
    * if (enc_bw != dec_bw) {
    *   printf("packet bandwidth mismatch!\n");
    * }
    * @endcode
    *
    * @see opus_encoder, opus_decoder_ctl, opus_encoder_ctl, opus_decoderctls, opus_encoderctls
    * @{
    */
  
  /** Resets the codec state to be equivalent to a freshly initialized state.
    * This should be called when switching streams in order to prevent
    * the back to back decoding from giving different results from
    * one at a time decoding.
    * @hideinitializer */
  #define OPUS_RESET_STATE 4028
  
  /** Gets the final state of the codec's entropy coder.
    * This is used for testing purposes,
    * The encoder and decoder state should be identical after coding a payload
    * (assuming no data corruption or software bugs)
    *
    * @param[out] x <tt>opus_uint32 *</tt>: Entropy coder state
    *
    * @hideinitializer */
  #define OPUS_GET_FINAL_RANGE(x) OPUS_GET_FINAL_RANGE_REQUEST, __opus_check_uint_ptr(x)
  
  /** Gets the pitch of the last decoded frame, if available.
    * This can be used for any post-processing algorithm requiring the use of pitch,
    * e.g. time stretching/shortening. If the last frame was not voiced, or if the
    * pitch was not coded in the frame, then zero is returned.
    *
    * This CTL is only implemented for decoder instances.
    *
    * @param[out] x <tt>opus_int32 *</tt>: pitch period at 48 kHz (or 0 if not available)
    *
    * @hideinitializer */
  #define OPUS_GET_PITCH(x) OPUS_GET_PITCH_REQUEST, __opus_check_int_ptr(x)
  
  /** Gets the encoder's configured bandpass or the decoder's last bandpass.
    * @see OPUS_SET_BANDWIDTH
    * @param[out] x <tt>opus_int32 *</tt>: Returns one of the following values:
    * <dl>
    * <dt>#OPUS_AUTO</dt>                    <dd>(default)</dd>
    * <dt>#OPUS_BANDWIDTH_NARROWBAND</dt>    <dd>4 kHz passband</dd>
    * <dt>#OPUS_BANDWIDTH_MEDIUMBAND</dt>    <dd>6 kHz passband</dd>
    * <dt>#OPUS_BANDWIDTH_WIDEBAND</dt>      <dd>8 kHz passband</dd>
    * <dt>#OPUS_BANDWIDTH_SUPERWIDEBAND</dt><dd>12 kHz passband</dd>
    * <dt>#OPUS_BANDWIDTH_FULLBAND</dt>     <dd>20 kHz passband</dd>
    * </dl>
    * @hideinitializer */
  #define OPUS_GET_BANDWIDTH(x) OPUS_GET_BANDWIDTH_REQUEST, __opus_check_int_ptr(x)
  
  /**@}*/
  
  /** @defgroup opus_decoderctls Decoder related CTLs
    * @see opus_genericctls, opus_encoderctls, opus_decoder
    * @{
    */
  
  /** Configures decoder gain adjustment.
    * Scales the decoded output by a factor specified in Q8 dB units.
    * This has a maximum range of -32768 to 32767 inclusive, and returns
    * OPUS_BAD_ARG otherwise. The default is zero indicating no adjustment.
    * This setting survives decoder reset.
    *
    * gain = pow(10, x/(20.0*256))
    *
    * @param[in] x <tt>opus_int32</tt>:   Amount to scale PCM signal by in Q8 dB units.
    * @hideinitializer */
  #define OPUS_SET_GAIN(x) OPUS_SET_GAIN_REQUEST, __opus_check_int(x)
  /** Gets the decoder's configured gain adjustment. @see OPUS_SET_GAIN
    *
    * @param[out] x <tt>opus_int32 *</tt>: Amount to scale PCM signal by in Q8 dB units.
    * @hideinitializer */
  #define OPUS_GET_GAIN(x) OPUS_GET_GAIN_REQUEST, __opus_check_int_ptr(x)
  
  /**@}*/
  
  /** @defgroup opus_libinfo Opus library information functions
    * @{
    */
  
  /** Converts an opus error code into a human readable string.
    *
    * @param[in] error <tt>int</tt>: Error number
    * @returns Error string
    */
  OPUS_EXPORT const char *opus_strerror(int error);
  
  /** Gets the libopus version string.
    *
    * @returns Version string
    */
  OPUS_EXPORT const char *opus_get_version_string(void);
  /**@}*/
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* OPUS_DEFINES_H */
  