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329 lines
14 KiB
C
329 lines
14 KiB
C
/* Copyright (c) 2007-2008 CSIRO
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Copyright (c) 2007-2009 Xiph.Org Foundation
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Copyright (c) 2008-2012 Gregory Maxwell
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Written by Jean-Marc Valin and Gregory Maxwell */
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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@file opus_custom.h
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@brief Opus-Custom reference implementation API
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*/
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#ifndef OPUS_CUSTOM_H
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#define OPUS_CUSTOM_H
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#include "opus_defines.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef CUSTOM_MODES
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#define OPUS_CUSTOM_EXPORT OPUS_EXPORT
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#define OPUS_CUSTOM_EXPORT_STATIC OPUS_EXPORT
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#else
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#define OPUS_CUSTOM_EXPORT
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#ifdef CELT_C
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#define OPUS_CUSTOM_EXPORT_STATIC static inline
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#else
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#define OPUS_CUSTOM_EXPORT_STATIC
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#endif
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#endif
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/** @defgroup opus_custom Opus Custom
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* @{
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* Opus Custom is an optional part of the Opus specification and
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* reference implementation which uses a distinct API from the regular
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* API and supports frame sizes that are not normally supported.\ Use
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* of Opus Custom is discouraged for all but very special applications
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* for which a frame size different from 2.5, 5, 10, or 20 ms is needed
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* (for either complexity or latency reasons) and where interoperability
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* is less important.
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*
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* In addition to the interoperability limitations the use of Opus custom
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* disables a substantial chunk of the codec and generally lowers the
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* quality available at a given bitrate. Normally when an application needs
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* a different frame size from the codec it should buffer to match the
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* sizes but this adds a small amount of delay which may be important
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* in some very low latency applications. Some transports (especially
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* constant rate RF transports) may also work best with frames of
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* particular durations.
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*
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* Libopus only supports custom modes if they are enabled at compile time.
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*
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* The Opus Custom API is similar to the regular API but the
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* @ref opus_encoder_create and @ref opus_decoder_create calls take
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* an additional mode parameter which is a structure produced by
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* a call to @ref opus_custom_mode_create. Both the encoder and decoder
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* must create a mode using the same sample rate (fs) and frame size
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* (frame size) so these parameters must either be signaled out of band
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* or fixed in a particular implementation.
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*
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* Similar to regular Opus the custom modes support on the fly frame size
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* switching, but the sizes available depend on the particular frame size in
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* use. For some initial frame sizes on a single on the fly size is available.
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*/
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/** Contains the state of an encoder. One encoder state is needed
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for each stream. It is initialized once at the beginning of the
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stream. Do *not* re-initialize the state for every frame.
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@brief Encoder state
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*/
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typedef struct OpusCustomEncoder OpusCustomEncoder;
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/** State of the decoder. One decoder state is needed for each stream.
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It is initialized once at the beginning of the stream. Do *not*
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re-initialize the state for every frame.
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@brief Decoder state
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*/
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typedef struct OpusCustomDecoder OpusCustomDecoder;
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/** The mode contains all the information necessary to create an
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encoder. Both the encoder and decoder need to be initialized
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with exactly the same mode, otherwise the output will be
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corrupted.
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@brief Mode configuration
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*/
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typedef struct OpusCustomMode OpusCustomMode;
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/** Creates a new mode struct. This will be passed to an encoder or
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* decoder. The mode MUST NOT BE DESTROYED until the encoders and
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* decoders that use it are destroyed as well.
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* @param [in] Fs <tt>int</tt>: Sampling rate (8000 to 96000 Hz)
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* @param [in] frame_size <tt>int</tt>: Number of samples (per channel) to encode in each
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* packet (64 - 1024, prime factorization must contain zero or more 2s, 3s, or 5s and no other primes)
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* @param [out] error <tt>int*</tt>: Returned error code (if NULL, no error will be returned)
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* @return A newly created mode
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*/
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OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT OpusCustomMode *opus_custom_mode_create(opus_int32 Fs, int frame_size, int *error);
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/** Destroys a mode struct. Only call this after all encoders and
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* decoders using this mode are destroyed as well.
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* @param [in] mode <tt>OpusCustomMode*</tt>: Mode to be freed.
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*/
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OPUS_CUSTOM_EXPORT void opus_custom_mode_destroy(OpusCustomMode *mode);
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/* Encoder */
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/** Gets the size of an OpusCustomEncoder structure.
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* @param [in] mode <tt>OpusCustomMode *</tt>: Mode configuration
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* @param [in] channels <tt>int</tt>: Number of channels
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* @returns size
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*/
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OPUS_CUSTOM_EXPORT_STATIC OPUS_WARN_UNUSED_RESULT int opus_custom_encoder_get_size(
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const OpusCustomMode *mode,
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int channels
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) OPUS_ARG_NONNULL(1);
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/** Creates a new encoder state. Each stream needs its own encoder
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* state (can't be shared across simultaneous streams).
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* @param [in] mode <tt>OpusCustomMode*</tt>: Contains all the information about the characteristics of
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* the stream (must be the same characteristics as used for the
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* decoder)
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* @param [in] channels <tt>int</tt>: Number of channels
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* @param [out] error <tt>int*</tt>: Returns an error code
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* @return Newly created encoder state.
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*/
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OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT OpusCustomEncoder *opus_custom_encoder_create(
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const OpusCustomMode *mode,
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int channels,
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int *error
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) OPUS_ARG_NONNULL(1);
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/** Initializes a previously allocated encoder state
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* The memory pointed to by st must be the size returned by opus_custom_encoder_get_size.
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* This is intended for applications which use their own allocator instead of malloc.
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* @see opus_custom_encoder_create(),opus_custom_encoder_get_size()
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* To reset a previously initialized state use the OPUS_RESET_STATE CTL.
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* @param [in] st <tt>OpusCustomEncoder*</tt>: Encoder state
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* @param [in] mode <tt>OpusCustomMode *</tt>: Contains all the information about the characteristics of
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* the stream (must be the same characteristics as used for the
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* decoder)
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* @param [in] channels <tt>int</tt>: Number of channels
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* @return OPUS_OK Success or @ref opus_errorcodes
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*/
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OPUS_CUSTOM_EXPORT_STATIC int opus_custom_encoder_init(
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OpusCustomEncoder *st,
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const OpusCustomMode *mode,
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int channels
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) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2);
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/** Destroys a an encoder state.
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* @param[in] st <tt>OpusCustomEncoder*</tt>: State to be freed.
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*/
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OPUS_CUSTOM_EXPORT void opus_custom_encoder_destroy(OpusCustomEncoder *st);
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/** Encodes a frame of audio.
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* @param [in] st <tt>OpusCustomEncoder*</tt>: Encoder state
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* @param [in] pcm <tt>float*</tt>: PCM audio in float format, with a normal range of +/-1.0.
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* Samples with a range beyond +/-1.0 are supported but will
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* be clipped by decoders using the integer API and should
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* only be used if it is known that the far end supports
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* extended dynamic range. There must be exactly
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* frame_size samples per channel.
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* @param [in] frame_size <tt>int</tt>: Number of samples per frame of input signal
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* @param [out] compressed <tt>char *</tt>: The compressed data is written here. This may not alias pcm and must be at least maxCompressedBytes long.
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* @param [in] maxCompressedBytes <tt>int</tt>: Maximum number of bytes to use for compressing the frame
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* (can change from one frame to another)
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* @return Number of bytes written to "compressed".
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* If negative, an error has occurred (see error codes). It is IMPORTANT that
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* the length returned be somehow transmitted to the decoder. Otherwise, no
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* decoding is possible.
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*/
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OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_encode_float(
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OpusCustomEncoder *st,
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const float *pcm,
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int frame_size,
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unsigned char *compressed,
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int maxCompressedBytes
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) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
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/** Encodes a frame of audio.
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* @param [in] st <tt>OpusCustomEncoder*</tt>: Encoder state
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* @param [in] pcm <tt>opus_int16*</tt>: PCM audio in signed 16-bit format (native endian).
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* There must be exactly frame_size samples per channel.
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* @param [in] frame_size <tt>int</tt>: Number of samples per frame of input signal
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* @param [out] compressed <tt>char *</tt>: The compressed data is written here. This may not alias pcm and must be at least maxCompressedBytes long.
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* @param [in] maxCompressedBytes <tt>int</tt>: Maximum number of bytes to use for compressing the frame
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* (can change from one frame to another)
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* @return Number of bytes written to "compressed".
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* If negative, an error has occurred (see error codes). It is IMPORTANT that
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* the length returned be somehow transmitted to the decoder. Otherwise, no
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* decoding is possible.
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*/
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OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_encode(
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OpusCustomEncoder *st,
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const opus_int16 *pcm,
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int frame_size,
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unsigned char *compressed,
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int maxCompressedBytes
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) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
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/** Perform a CTL function on an Opus custom encoder.
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*
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* Generally the request and subsequent arguments are generated
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* by a convenience macro.
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* @see opus_encoderctls
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*/
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OPUS_CUSTOM_EXPORT int opus_custom_encoder_ctl(OpusCustomEncoder * OPUS_RESTRICT st, int request, ...) OPUS_ARG_NONNULL(1);
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/* Decoder */
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/** Gets the size of an OpusCustomDecoder structure.
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* @param [in] mode <tt>OpusCustomMode *</tt>: Mode configuration
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* @param [in] channels <tt>int</tt>: Number of channels
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* @returns size
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*/
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OPUS_CUSTOM_EXPORT_STATIC OPUS_WARN_UNUSED_RESULT int opus_custom_decoder_get_size(
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const OpusCustomMode *mode,
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int channels
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) OPUS_ARG_NONNULL(1);
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/** Creates a new decoder state. Each stream needs its own decoder state (can't
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* be shared across simultaneous streams).
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* @param [in] mode <tt>OpusCustomMode</tt>: Contains all the information about the characteristics of the
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* stream (must be the same characteristics as used for the encoder)
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* @param [in] channels <tt>int</tt>: Number of channels
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* @param [out] error <tt>int*</tt>: Returns an error code
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* @return Newly created decoder state.
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*/
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OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT OpusCustomDecoder *opus_custom_decoder_create(
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const OpusCustomMode *mode,
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int channels,
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int *error
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) OPUS_ARG_NONNULL(1);
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/** Initializes a previously allocated decoder state
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* The memory pointed to by st must be the size returned by opus_custom_decoder_get_size.
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* This is intended for applications which use their own allocator instead of malloc.
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* @see opus_custom_decoder_create(),opus_custom_decoder_get_size()
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* To reset a previously initialized state use the OPUS_RESET_STATE CTL.
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* @param [in] st <tt>OpusCustomDecoder*</tt>: Decoder state
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* @param [in] mode <tt>OpusCustomMode *</tt>: Contains all the information about the characteristics of
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* the stream (must be the same characteristics as used for the
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* encoder)
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* @param [in] channels <tt>int</tt>: Number of channels
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* @return OPUS_OK Success or @ref opus_errorcodes
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*/
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OPUS_CUSTOM_EXPORT_STATIC int opus_custom_decoder_init(
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OpusCustomDecoder *st,
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const OpusCustomMode *mode,
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int channels
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) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2);
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/** Destroys a an decoder state.
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* @param[in] st <tt>OpusCustomDecoder*</tt>: State to be freed.
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*/
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OPUS_CUSTOM_EXPORT void opus_custom_decoder_destroy(OpusCustomDecoder *st);
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/** Decode an opus custom frame with floating point output
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* @param [in] st <tt>OpusCustomDecoder*</tt>: Decoder state
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* @param [in] data <tt>char*</tt>: Input payload. Use a NULL pointer to indicate packet loss
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* @param [in] len <tt>int</tt>: Number of bytes in payload
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* @param [out] pcm <tt>float*</tt>: Output signal (interleaved if 2 channels). length
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* is frame_size*channels*sizeof(float)
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* @param [in] frame_size Number of samples per channel of available space in *pcm.
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* @returns Number of decoded samples or @ref opus_errorcodes
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*/
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OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_decode_float(
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OpusCustomDecoder *st,
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const unsigned char *data,
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int len,
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float *pcm,
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int frame_size
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) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
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/** Decode an opus custom frame
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* @param [in] st <tt>OpusCustomDecoder*</tt>: Decoder state
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* @param [in] data <tt>char*</tt>: Input payload. Use a NULL pointer to indicate packet loss
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* @param [in] len <tt>int</tt>: Number of bytes in payload
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* @param [out] pcm <tt>opus_int16*</tt>: Output signal (interleaved if 2 channels). length
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* is frame_size*channels*sizeof(opus_int16)
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* @param [in] frame_size Number of samples per channel of available space in *pcm.
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* @returns Number of decoded samples or @ref opus_errorcodes
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*/
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OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_decode(
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OpusCustomDecoder *st,
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const unsigned char *data,
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int len,
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opus_int16 *pcm,
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int frame_size
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) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
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/** Perform a CTL function on an Opus custom decoder.
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*
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* Generally the request and subsequent arguments are generated
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* by a convenience macro.
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* @see opus_genericctls
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*/
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OPUS_CUSTOM_EXPORT int opus_custom_decoder_ctl(OpusCustomDecoder * OPUS_RESTRICT st, int request, ...) OPUS_ARG_NONNULL(1);
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/**@}*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* OPUS_CUSTOM_H */
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