276 lines
11 KiB
C
Executable File
276 lines
11 KiB
C
Executable File
/* (C) 2007-2008 Jean-Marc Valin, CSIRO
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(C) 2008 Gregory Maxwell */
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/**
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@file celt.h
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@brief Contains all the functions for encoding and decoding audio
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*/
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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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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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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 FOUNDATION OR
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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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#ifndef CELT_H
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#define CELT_H
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#include "celt_types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if defined(__GNUC__) && defined(CELT_BUILD)
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#define EXPORT __attribute__ ((visibility ("default")))
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#elif defined(WIN32)
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#define EXPORT __declspec(dllexport)
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#else
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#define EXPORT
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#endif
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#define _celt_check_int(x) (((void)((x) == (celt_int32_t)0)), (celt_int32_t)(x))
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#define _celt_check_mode_ptr_ptr(ptr) ((ptr) + ((ptr) - (CELTMode**)(ptr)))
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/* Error codes */
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/** No error */
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#define CELT_OK 0
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/** An (or more) invalid argument (e.g. out of range) */
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#define CELT_BAD_ARG -1
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/** The mode struct passed is invalid */
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#define CELT_INVALID_MODE -2
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/** An internal error was detected */
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#define CELT_INTERNAL_ERROR -3
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/** The data passed (e.g. compressed data to decoder) is corrupted */
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#define CELT_CORRUPTED_DATA -4
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/** Invalid/unsupported request number */
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#define CELT_UNIMPLEMENTED -5
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/** An encoder or decoder structure is invalid or already freed */
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#define CELT_INVALID_STATE -6
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/* Requests */
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#define CELT_GET_MODE_REQUEST 1
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/** Get the CELTMode used by an encoder or decoder */
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#define CELT_GET_MODE(x) CELT_GET_MODE_REQUEST, _celt_check_mode_ptr_ptr(x)
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#define CELT_SET_COMPLEXITY_REQUEST 2
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/** Controls the complexity from 0-10 (int) */
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#define CELT_SET_COMPLEXITY(x) CELT_SET_COMPLEXITY_REQUEST, _celt_check_int(x)
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#define CELT_SET_PREDICTION_REQUEST 4
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/** Controls the use of interframe prediction.
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0=Independent frames
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1=Short term interframe prediction allowed
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2=Long term prediction allowed
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*/
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#define CELT_SET_PREDICTION(x) CELT_SET_PREDICTION_REQUEST, _celt_check_int(x)
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#define CELT_SET_VBR_RATE_REQUEST 6
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/** Set the target VBR rate in bits per second(int); 0=CBR (default) */
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#define CELT_SET_VBR_RATE(x) CELT_SET_VBR_RATE_REQUEST, _celt_check_int(x)
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/** Reset the encoder/decoder memories to zero*/
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#define CELT_RESET_STATE_REQUEST 8
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#define CELT_RESET_STATE CELT_RESET_STATE_REQUEST
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/** GET the frame size used in the current mode */
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#define CELT_GET_FRAME_SIZE 1000
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/** GET the lookahead used in the current mode */
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#define CELT_GET_LOOKAHEAD 1001
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/** GET the number of channels used in the current mode */
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#define CELT_GET_NB_CHANNELS 1002
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/** GET the sample rate used in the current mode */
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#define CELT_GET_SAMPLE_RATE 1003
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/** GET the bit-stream version for compatibility check */
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#define CELT_GET_BITSTREAM_VERSION 2000
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/** Contains the state of an encoder. One encoder state is needed
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for each stream. It is initialised once at the beginning of the
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stream. Do *not* re-initialise the state for every frame.
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@brief Encoder state
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*/
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typedef struct CELTEncoder CELTEncoder;
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/** State of the decoder. One decoder state is needed for each stream.
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It is initialised once at the beginning of the stream. Do *not*
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re-initialise the state for every frame */
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typedef struct CELTDecoder CELTDecoder;
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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 initialised
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with exactly the same mode, otherwise the quality will be very
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bad */
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typedef struct CELTMode CELTMode;
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/** \defgroup codec Encoding and decoding */
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/* @{ */
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/* Mode calls */
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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 Fs Sampling rate (32000 to 96000 Hz)
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@param channels Number of channels
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@param frame_size Number of samples (per channel) to encode in each
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packet (even values; 64 - 512)
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@param error 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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EXPORT CELTMode *celt_mode_create(celt_int32_t Fs, int channels, 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 mode Mode to be destroyed
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*/
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EXPORT void celt_mode_destroy(CELTMode *mode);
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/** Query information from a mode */
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EXPORT int celt_mode_info(const CELTMode *mode, int request, celt_int32_t *value);
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/* Encoder stuff */
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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 mode 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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@return Newly created encoder state.
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*/
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EXPORT CELTEncoder *celt_encoder_create(const CELTMode *mode);
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/** Destroys a an encoder state.
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@param st Encoder state to be destroyed
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*/
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EXPORT void celt_encoder_destroy(CELTEncoder *st);
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/** Encodes a frame of audio.
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@param st Encoder state
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@param pcm 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 dynmaic range. There must be exactly
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* frame_size samples per channel.
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@param optional_synthesis If not NULL, the encoder copies the audio signal that
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* the decoder would decode. It is the same as calling the
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* decoder on the compressed data, just faster.
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* This may alias pcm.
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@param compressed The compressed data is written here. This may not alias pcm or
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* optional_synthesis.
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@param nbCompressedBytes 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". Will be the same as
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* "nbCompressedBytes" unless the stream is VBR and will never be larger.
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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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EXPORT int celt_encode_float(CELTEncoder *st, const float *pcm, float *optional_synthesis, unsigned char *compressed, int nbCompressedBytes);
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/** Encodes a frame of audio.
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@param st Encoder state
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@param pcm PCM audio in signed 16-bit format (native endian). There must be
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* exactly frame_size samples per channel.
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@param optional_synthesis If not NULL, the encoder copies the audio signal that
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* the decoder would decode. It is the same as calling the
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* decoder on the compressed data, just faster.
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* This may alias pcm.
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@param compressed The compressed data is written here. This may not alias pcm or
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* optional_synthesis.
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@param nbCompressedBytes 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". Will be the same as
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* "nbCompressedBytes" unless the stream is VBR and will never be larger.
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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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EXPORT int celt_encode(CELTEncoder *st, const celt_int16_t *pcm, celt_int16_t *optional_synthesis, unsigned char *compressed, int nbCompressedBytes);
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/** Query and set encoder parameters
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@param st Encoder state
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@param request Parameter to change or query
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@param value Pointer to a 32-bit int value
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@return Error code
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*/
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EXPORT int celt_encoder_ctl(CELTEncoder * st, int request, ...);
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/* Decoder stuff */
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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 mode 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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@return Newly created decoder state.
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*/
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EXPORT CELTDecoder *celt_decoder_create(const CELTMode *mode);
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/** Destroys a a decoder state.
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@param st Decoder state to be destroyed
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*/
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EXPORT void celt_decoder_destroy(CELTDecoder *st);
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/** Decodes a frame of audio.
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@param st Decoder state
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@param data Compressed data produced by an encoder
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@param len Number of bytes to read from "data". This MUST be exactly the number
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of bytes returned by the encoder. Using a larger value WILL NOT WORK.
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@param pcm One frame (frame_size samples per channel) of decoded PCM will be
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returned here in float format.
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@return Error code.
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*/
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EXPORT int celt_decode_float(CELTDecoder *st, const unsigned char *data, int len, float *pcm);
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/** Decodes a frame of audio.
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@param st Decoder state
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@param data Compressed data produced by an encoder
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@param len Number of bytes to read from "data". This MUST be exactly the number
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of bytes returned by the encoder. Using a larger value WILL NOT WORK.
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@param pcm One frame (frame_size samples per channel) of decoded PCM will be
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returned here in 16-bit PCM format (native endian).
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@return Error code.
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*/
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EXPORT int celt_decode(CELTDecoder *st, const unsigned char *data, int len, celt_int16_t *pcm);
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/** Query and set decoder parameters
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@param st Decoder state
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@param request Parameter to change or query
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@param value Pointer to a 32-bit int value
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@return Error code
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*/
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EXPORT int celt_decoder_ctl(CELTDecoder * st, int request, ...);
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/* @} */
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#ifdef __cplusplus
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}
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#endif
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#endif /*CELT_H */
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