148 lines
3.7 KiB
C
148 lines
3.7 KiB
C
/*
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* Copyright (C) 2003-2012 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef PCM_EXPORT_H
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#define PCM_EXPORT_H
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#include "check.h"
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#include "pcm_buffer.h"
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#include "audio_format.h"
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#include <stdbool.h>
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struct audio_format;
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/**
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* An object that handles export of PCM samples to some instance
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* outside of MPD. It has a few more options to tweak the binary
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* representation which are not supported by the pcm_convert library.
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*/
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struct pcm_export_state {
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/**
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* The buffer is used to convert DSD samples to the
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* DSD-over-USB format.
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*
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* @see #dsd_usb
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*/
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struct pcm_buffer dsd_buffer;
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/**
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* The buffer is used to pack samples, removing padding.
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*
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* @see #pack24
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*/
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struct pcm_buffer pack_buffer;
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/**
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* The buffer is used to reverse the byte order.
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*
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* @see #reverse_endian
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*/
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struct pcm_buffer reverse_buffer;
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/**
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* The number of channels.
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*/
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uint8_t channels;
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/**
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* Convert DSD to DSD-over-USB? Input format must be
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* SAMPLE_FORMAT_DSD and output format must be
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* SAMPLE_FORMAT_S24_P32.
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*/
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bool dsd_usb;
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/**
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* Convert (padded) 24 bit samples to 32 bit by shifting 8
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* bits to the left?
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*/
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bool shift8;
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/**
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* Pack 24 bit samples?
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*/
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bool pack24;
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/**
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* Export the samples in reverse byte order? A non-zero value
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* means the option is enabled and represents the size of each
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* sample (2 or bigger).
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*/
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uint8_t reverse_endian;
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};
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/**
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* Initialize a #pcm_export_state object.
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*/
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void
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pcm_export_init(struct pcm_export_state *state);
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/**
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* Deinitialize a #pcm_export_state object and free allocated memory.
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*/
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void
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pcm_export_deinit(struct pcm_export_state *state);
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/**
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* Open the #pcm_export_state object.
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*
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* There is no "close" method. This function may be called multiple
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* times to reuse the object, until pcm_export_deinit() is called.
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*
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* This function cannot fail.
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*
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* @param channels the number of channels; ignored unless dsd_usb is set
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*/
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void
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pcm_export_open(struct pcm_export_state *state,
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enum sample_format sample_format, unsigned channels,
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bool dsd_usb, bool shift8, bool pack, bool reverse_endian);
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/**
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* Calculate the size of one output frame.
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*/
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G_GNUC_PURE
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size_t
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pcm_export_frame_size(const struct pcm_export_state *state,
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const struct audio_format *audio_format);
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/**
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* Export a PCM buffer.
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*
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* @param state an initialized and open pcm_export_state object
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* @param src the source PCM buffer
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* @param src_size the size of #src in bytes
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* @param dest_size_r returns the number of bytes of the destination buffer
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* @return the destination buffer (may be a pointer to the source buffer)
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*/
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const void *
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pcm_export(struct pcm_export_state *state, const void *src, size_t src_size,
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size_t *dest_size_r);
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/**
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* Converts the number of consumed bytes from the pcm_export()
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* destination buffer to the according number of bytes from the
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* pcm_export() source buffer.
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*/
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G_GNUC_PURE
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size_t
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pcm_export_source_size(const struct pcm_export_state *state, size_t dest_size);
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#endif
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