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+/* 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
+/** Not enough bytes allocated in the buffer @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(WIN32)
+# if defined(OPUS_BUILD) && defined(DLL_EXPORT)
+# define OPUS_EXPORT __declspec(dllexport)
+# else
+# define OPUS_EXPORT
+# endif
+# elif defined(__GNUC__) && defined(OPUS_BUILD)
+# define OPUS_EXPORT __attribute__ ((visibility ("default")))
+# 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
+
+#if (!defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L) )
+# if OPUS_GNUC_PREREQ(2,7)
+# define OPUS_INLINE __inline__
+# elif (defined(_MSC_VER))
+# define OPUS_INLINE __inline
+# else
+# define OPUS_INLINE
+# endif
+#else
+# define OPUS_INLINE inline
+#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
+#define OPUS_SET_EXPERT_FRAME_DURATION_REQUEST 4040
+#define OPUS_GET_EXPERT_FRAME_DURATION_REQUEST 4041
+#define OPUS_SET_PREDICTION_DISABLED_REQUEST 4042
+#define OPUS_GET_PREDICTION_DISABLED_REQUEST 4043
+
+/* 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)))
+#define __opus_check_val16_ptr(ptr) ((ptr) + ((ptr) - (opus_val16*)(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*/
+
+#define OPUS_FRAMESIZE_ARG 5000 /**< Select frame size from the argument (default) */
+#define OPUS_FRAMESIZE_2_5_MS 5001 /**< Use 2.5 ms frames */
+#define OPUS_FRAMESIZE_5_MS 5002 /**< Use 5 ms frames */
+#define OPUS_FRAMESIZE_10_MS 5003 /**< Use 10 ms frames */
+#define OPUS_FRAMESIZE_20_MS 5004 /**< Use 20 ms frames */
+#define OPUS_FRAMESIZE_40_MS 5005 /**< Use 40 ms frames */
+#define OPUS_FRAMESIZE_60_MS 5006 /**< Use 60 ms frames */
+
+/**@}*/
+
+
+/** @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.
+ * @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 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 trigger progressively more loss resistant behavior in the encoder
+ * at the expense of quality at a given bitrate in the absence of packet loss, 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.
+ * It represents the number of significant bits of linear intensity below
+ * which the signal contains ignorable quantization or other noise.
+ *
+ * For example, OPUS_SET_LSB_DEPTH(14) would be an appropriate setting
+ * for G.711 u-law input. OPUS_SET_LSB_DEPTH(16) would be appropriate
+ * for 16-bit linear pcm input with opus_encode_float().
+ *
+ * When using opus_encode() instead of opus_encode_float(), or when libopus
+ * is compiled for fixed-point, the encoder uses the minimum of the value
+ * set here and the value 16.
+ *
+ * @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)
+
+/** Configures the encoder's use of variable duration frames.
+ * When variable duration is enabled, the encoder is free to use a shorter frame
+ * size than the one requested in the opus_encode*() call.
+ * It is then the user's responsibility
+ * to verify how much audio was encoded by checking the ToC byte of the encoded
+ * packet. The part of the audio that was not encoded needs to be resent to the
+ * encoder for the next call. Do not use this option unless you <b>really</b>
+ * know what you are doing.
+ * @see OPUS_GET_EXPERT_FRAME_DURATION
+ * @param[in] x <tt>opus_int32</tt>: Allowed values:
+ * <dl>
+ * <dt>OPUS_FRAMESIZE_ARG</dt><dd>Select frame size from the argument (default).</dd>
+ * <dt>OPUS_FRAMESIZE_2_5_MS</dt><dd>Use 2.5 ms frames.</dd>
+ * <dt>OPUS_FRAMESIZE_5_MS</dt><dd>Use 5 ms frames.</dd>
+ * <dt>OPUS_FRAMESIZE_10_MS</dt><dd>Use 10 ms frames.</dd>
+ * <dt>OPUS_FRAMESIZE_20_MS</dt><dd>Use 20 ms frames.</dd>
+ * <dt>OPUS_FRAMESIZE_40_MS</dt><dd>Use 40 ms frames.</dd>
+ * <dt>OPUS_FRAMESIZE_60_MS</dt><dd>Use 60 ms frames.</dd>
+ * <dt>OPUS_FRAMESIZE_VARIABLE</dt><dd>Optimize the frame size dynamically.</dd>
+ * </dl>
+ * @hideinitializer */
+#define OPUS_SET_EXPERT_FRAME_DURATION(x) OPUS_SET_EXPERT_FRAME_DURATION_REQUEST, __opus_check_int(x)
+/** Gets the encoder's configured use of variable duration frames.
+ * @see OPUS_SET_EXPERT_FRAME_DURATION
+ * @param[out] x <tt>opus_int32 *</tt>: Returns one of the following values:
+ * <dl>
+ * <dt>OPUS_FRAMESIZE_ARG</dt><dd>Select frame size from the argument (default).</dd>
+ * <dt>OPUS_FRAMESIZE_2_5_MS</dt><dd>Use 2.5 ms frames.</dd>
+ * <dt>OPUS_FRAMESIZE_5_MS</dt><dd>Use 5 ms frames.</dd>
+ * <dt>OPUS_FRAMESIZE_10_MS</dt><dd>Use 10 ms frames.</dd>
+ * <dt>OPUS_FRAMESIZE_20_MS</dt><dd>Use 20 ms frames.</dd>
+ * <dt>OPUS_FRAMESIZE_40_MS</dt><dd>Use 40 ms frames.</dd>
+ * <dt>OPUS_FRAMESIZE_60_MS</dt><dd>Use 60 ms frames.</dd>
+ * <dt>OPUS_FRAMESIZE_VARIABLE</dt><dd>Optimize the frame size dynamically.</dd>
+ * </dl>
+ * @hideinitializer */
+#define OPUS_GET_EXPERT_FRAME_DURATION(x) OPUS_GET_EXPERT_FRAME_DURATION_REQUEST, __opus_check_int_ptr(x)
+
+/** If set to 1, disables almost all use of prediction, making frames almost
+ * completely independent. This reduces quality.
+ * @see OPUS_GET_PREDICTION_DISABLED
+ * @param[in] x <tt>opus_int32</tt>: Allowed values:
+ * <dl>
+ * <dt>0</dt><dd>Enable prediction (default).</dd>
+ * <dt>1</dt><dd>Disable prediction.</dd>
+ * </dl>
+ * @hideinitializer */
+#define OPUS_SET_PREDICTION_DISABLED(x) OPUS_SET_PREDICTION_DISABLED_REQUEST, __opus_check_int(x)
+/** Gets the encoder's configured prediction status.
+ * @see OPUS_SET_PREDICTION_DISABLED
+ * @param[out] x <tt>opus_int32 *</tt>: Returns one of the following values:
+ * <dl>
+ * <dt>0</dt><dd>Prediction enabled (default).</dd>
+ * <dt>1</dt><dd>Prediction disabled.</dd>
+ * </dl>
+ * @hideinitializer */
+#define OPUS_GET_PREDICTION_DISABLED(x) OPUS_GET_PREDICTION_DISABLED_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 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)
+
+/** 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)
+
+/**@}*/
+
+/** @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)
+
+/** 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)
+
+/** 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)
+
+/**@}*/
+
+/** @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.
+ *
+ * Applications may look for the substring "-fixed" in the version string to
+ * determine whether they have a fixed-point or floating-point build at
+ * runtime.
+ *
+ * @returns Version string
+ */
+OPUS_EXPORT const char *opus_get_version_string(void);
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* OPUS_DEFINES_H */