rockbox/apps/codecs/libmusepack/musepack.h

/*
  Copyright (c) 2005, The Musepack Development Team
  All rights reserved.

  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.

  * Neither the name of the The Musepack Development Team nor the
  names of its contributors may be used to endorse or promote
  products derived from this software without specific prior
  written permission.

  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 mpcdec.h
/// Top level include file for libmpcdec.

#ifndef _mpcdec_h_
#define _mpcdec_h_

#ifdef __cplusplus
extern "C" {
#endif

//#include <stdlib.h>
#include <string.h>

#include "../codec.h"
#include "config_types.h"
#include "decoder.h"
#include "math.h"
#include "reader.h"
#include "streaminfo.h"
    
#ifdef ROCKBOX_LITTLE_ENDIAN
#define MPC_LITTLE_ENDIAN
#endif

enum {
    MPC_FRAME_LENGTH = (36 * 32),    /// samples per mpc frame
    MPC_DECODER_BUFFER_LENGTH = 4 * MPC_FRAME_LENGTH /// required buffer size for decoder
};

// error codes
#define ERROR_CODE_OK            0
#define ERROR_CODE_FILE         -1
#define ERROR_CODE_SV7BETA       1
#define ERROR_CODE_CBR           2
#define ERROR_CODE_IS            3
#define ERROR_CODE_BLOCKSIZE     4
#define ERROR_CODE_INVALIDSV     5

/// Initializes a streaminfo structure.
/// \param si streaminfo structure to initialize
void mpc_streaminfo_init(mpc_streaminfo *si);

/// Reads streaminfo header from the mpc stream supplied by r.
/// \param si streaminfo pointer to which info will be written
/// \param r stream reader to supply raw data
/// \return error code
mpc_int32_t mpc_streaminfo_read(mpc_streaminfo *si, mpc_reader *r);

/// Gets length of stream si, in seconds.
/// \return length of stream in seconds
double mpc_streaminfo_get_length(mpc_streaminfo *si);

/// Returns length of stream si, in samples.
/// \return length of stream in samples
mpc_int64_t mpc_streaminfo_get_length_samples(mpc_streaminfo *si);

/// Sets up decoder library.
/// Call this first when preparing to decode an mpc stream.
/// \param r reader that will supply raw data to the decoder
void mpc_decoder_setup(mpc_decoder *d, mpc_reader *r);

/// Initializes mpc decoder with the supplied stream info parameters.
/// Call this next after calling mpc_decoder_setup.
/// \param si streaminfo structure indicating format of source stream
/// \return TRUE if decoder was initalized successfully, FALSE otherwise    
mpc_bool_t mpc_decoder_initialize(mpc_decoder *d, mpc_streaminfo *si);

void mpc_decoder_set_streaminfo(mpc_decoder *d, mpc_streaminfo *si);

/// Sets decoder sample scaling factor.  All decoded samples will be multiplied
/// by this factor.
/// \param scale_factor multiplicative scaling factor
void mpc_decoder_scale_output(mpc_decoder *d, double scale_factor);

/// Actually reads data from previously initialized stream.  Call
/// this iteratively to decode the mpc stream.
/// \param buffer destination buffer for decoded samples
/// \param vbr_update_acc \todo document me
/// \param vbr_update_bits \todo document me
/// \return -1 if an error is encountered
/// \return 0 if the stream has been completely decoded successfully and there are no more samples
/// \return > 0 to indicate the number of bytes that were actually read from the stream.
mpc_uint32_t mpc_decoder_decode(
    mpc_decoder *d,
    MPC_SAMPLE_FORMAT *buffer, 
    mpc_uint32_t *vbr_update_acc, 
    mpc_uint32_t *vbr_update_bits);

mpc_uint32_t mpc_decoder_decode_frame(
    mpc_decoder *d,
    mpc_uint32_t *in_buffer,
    mpc_uint32_t in_len,
    MPC_SAMPLE_FORMAT *out_buffer);

/// Seeks to the specified sample in the source stream.
mpc_bool_t mpc_decoder_seek_sample(mpc_decoder *d, mpc_int64_t destsample);

/// Seeks to specified position in seconds in the source stream.
mpc_bool_t mpc_decoder_seek_seconds(mpc_decoder *d, double seconds);

#ifdef __cplusplus
}
#endif // __cplusplus

#endif // _mpcdec_h_