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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-runtime-lib
* Created on: 16 апр. 2020 г.
*
* lsp-runtime-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-runtime-lib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-runtime-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef LSP_PLUG_IN_MM_IOUTAUDIOSTREAM_H_
#define LSP_PLUG_IN_MM_IOUTAUDIOSTREAM_H_
#include <lsp-plug.in/runtime/version.h>
#include <lsp-plug.in/common/status.h>
#include <lsp-plug.in/mm/types.h>
namespace lsp
{
namespace mm
{
class IOutAudioStream
{
private:
IOutAudioStream & operator = (const IOutAudioStream &);
public:
static const size_t IO_BUF_SIZE = 0x1000;
protected:
wssize_t nOffset; // Offset from beginning, negative if closed
status_t nErrorCode; // Last error code
uint8_t *pBuffer; // Buffer for sample format conversion
size_t nBufSize; // Size of buffer
audio_stream_t sFormat; // Audio stream format
protected:
void do_close();
inline status_t set_error(status_t error) { return nErrorCode = error; }
/**
* Ensure that internal buffer has enough capacity to keep specified number of bytes
* @param bytes number of bytes
* @return status of operation
*/
status_t ensure_capacity(size_t bytes);
/**
* Perform direct write of sample data
*
* @param src buffer with frame data.
* @param nframes number of frames to write
* @param fmt actual sample format that should be written
* @return number of frames actually written or negative error code
*/
virtual ssize_t direct_write(const void *src, size_t nframes, size_t fmt);
/**
* Perform write with conversion
* @param dst source buffer with frame data
* @param nframes number of frames to write
* @param fmt sample format
* @return status if operation
*/
virtual ssize_t conv_write(const void *src, size_t nframes, size_t fmt);
/**
* Select preferred sample format depending on the actual sample format
* @param rfmt requested format
* @return preferred sample format, by default 0 (unsupported format)
*/
virtual size_t select_format(size_t rfmt);
public:
explicit IOutAudioStream();
virtual ~IOutAudioStream();
public:
/**
* Check whether audio stream is closed
* @return true if audio stream is closed
*/
inline bool is_closed() const { return nOffset < 0; }
/** Get last I/O error code
*
* @return last I/O error code
*/
inline status_t last_error() const { return nErrorCode; };
/**
* Obtain the information about audio stream
* @param dst destination to store the audio stream information
* @return status of operation
*/
status_t info(audio_stream_t *dst) const;
/**
* Get sample rate
* @return sample rate
*/
inline size_t sample_rate() const { return sFormat.srate; }
/**
* Get number of channels
* @return number of channels
*/
inline size_t channels() const { return sFormat.channels; }
/**
* Get overall duration
* @return overall number of frames available in audio stream,
* negative if number of frames can not be estimated
*/
inline wssize_t length() const { return sFormat.frames; }
/**
* Get sample format
* @return sample format
*/
inline size_t format() const { return sFormat.format; }
/**
* Flush audio stream
* @return status of operations
*/
virtual status_t flush();
/**
* Close audio stream
* @return status of operations
*/
virtual status_t close();
/**
* Get actual position in frames from beginning of the stream
* @return number of frames from beginning of the stream or negative error code
*/
virtual wssize_t position();
/**
* Try to seek stream at the specified position
* @return actual position in frames from beginnin of the stream
* or negative error code on error (STATUS_NOT_SUPPORTED if stream
* positioning is not supported)
*/
virtual wssize_t seek(wsize_t nframes);
/**
* Different reads
* @param dst destination buffer to perform read
* @param nframes number of frames to read
* @return number of frames actually read or negative status fo operation
*/
virtual ssize_t write(const uint8_t *dst, size_t nframes);
virtual ssize_t write(const int8_t *dst, size_t nframes);
virtual ssize_t write(const uint16_t *dst, size_t nframes);
virtual ssize_t write(const int16_t *dst, size_t nframes);
virtual ssize_t write(const uint32_t *dst, size_t nframes);
virtual ssize_t write(const int32_t *dst, size_t nframes);
virtual ssize_t write(const f32_t *dst, size_t nframes);
virtual ssize_t write(const f64_t *dst, size_t nframes);
/**
* Strict type reads
* @param dst destination buffer to perform read
* @param nframe number of frames to read
*/
inline ssize_t write_u8(const void *dst, size_t nframes) { return write(static_cast<const uint8_t *>(dst), nframes); }
inline ssize_t write_s8(const void *dst, size_t nframes) { return write(static_cast<const int8_t *>(dst), nframes); }
inline ssize_t write_u16(const void *dst, size_t nframes) { return write(static_cast<const uint16_t *>(dst), nframes); }
inline ssize_t write_s16(const void *dst, size_t nframes) { return write(static_cast<const int16_t *>(dst), nframes); }
inline ssize_t write_u32(const void *dst, size_t nframes) { return write(static_cast<const uint32_t *>(dst), nframes); }
inline ssize_t write_s32(const void *dst, size_t nframes) { return write(static_cast<const int32_t *>(dst), nframes); }
inline ssize_t write_f32(const void *dst, size_t nframes) { return write(static_cast<const f32_t *>(dst), nframes); }
inline ssize_t write_f64(const void *dst, size_t nframes) { return write(static_cast<const f64_t *>(dst), nframes); }
};
} /* namespace mm */
} /* namespace lsp */
#endif /* LSP_PLUG_IN_MM_IOUTAUDIOSTREAM_H_ */
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