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https://github.com/RetroDECK/Supermodel.git
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134 lines
3.7 KiB
C
134 lines
3.7 KiB
C
/**
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** Supermodel
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** A Sega Model 3 Arcade Emulator.
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** Copyright 2011 Bart Trzynadlowski, Nik Henson
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**
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** This file is part of Supermodel.
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**
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** Supermodel is free software: you can redistribute it and/or modify it under
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** the terms of the GNU General Public License as published by the Free
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** Software Foundation, either version 3 of the License, or (at your option)
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** any later version.
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**
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** Supermodel is distributed in the hope that it will be useful, but WITHOUT
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** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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** FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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** 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 Supermodel. If not, see <http://www.gnu.org/licenses/>.
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**/
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/*
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* MPEG.h
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*
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* Header file for MPEG decoder based on AMP by Tomislav Uzalec. Modified to
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* play from memory buffers by R. Belmont for his arcade music player, M1.
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*/
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#ifndef INCLUDED_MPEG_H
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#define INCLUDED_MPEG_H
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#include "Types.h"
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/******************************************************************************
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Functions
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The MPEG decoder is not thread-safe and must not be used by multiple sources.
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These functions are located in audio.cpp and getbits.cpp.
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******************************************************************************/
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/*
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* MPEG_IsPlaying(void):
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*
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* Returns:
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* TRUE if an MPEG stream is currently playing, otherwise false.
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*/
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extern bool MPEG_IsPlaying(void);
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/*
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* MPEG_GetProgress(void):
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*
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* Returns:
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* The current byte offset within the MPEG stream, relative to the start.
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*/
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extern int MPEG_GetProgress(void);
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/*
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* MPEG_SetOffset(pos):
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*
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* Sets the playback position within an MPEG stream.
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*
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* Parameters:
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* pos Byte offset relative to the beginning of the current MPEG
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* stream.
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*/
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extern void MPEG_SetOffset(int pos);
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/*
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* MPEG_SetLoop(loop, loopend):
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*
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* Sets the start and end offsets for looped playback.
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*
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* Parameters:
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* loop Start address.
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* loopend End offset. Must NOT be 0!
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*/
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extern void MPEG_SetLoop(const char *loop, int loopend);
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/*
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* MPEG_Decode(outputs, length):
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*
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* Decodes the requested number of samples from the currently playing MPEG
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* stream and updates the internal play position. If an MPEG is not playing,
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* writes silence (zeros).
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*
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* Parameters:
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* outputs A two-element array of pointers to equal-length signed 16-
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* bit sample buffers. The first is the left channel and the
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* second is the right channel. Audio is decoded to these.
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* length Number of samples to decode.
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*/
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extern void MPEG_Decode(INT16 **outputs, int length);
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/*
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* MPEG_PlayMemory(sa, length):
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*
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* Specifies the memory buffer to decode from. This initializes the playback
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* process and will decode the first MPEG frame internally. The loop start
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* position is cleared (set looping after this call).
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*
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* Parameters:
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* sa Start address of MPEG stream.
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* length Length in bytes.
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*/
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extern void MPEG_PlayMemory(const char *sa, int length);
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/*
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* MPEG_StopPlaying(void):
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*
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* Stop playing the current MPEG stream. The decoder will return silence.
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*/
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extern void MPEG_StopPlaying(void);
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/*
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* MPEG_Init(void):
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*
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* Initializes the MPEG decoder. This should be called once per program
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* session. Allocates an internal buffer for MPEG decoding.
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*
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* Returns:
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* OKAY if successful, FAIL if internal buffer could not be allocated.
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*/
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extern bool MPEG_Init(void);
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/*
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* MPEG_Shutdown(void):
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*
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* Shuts down the MPEG decoder. Releases internal memory.
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*/
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extern void MPEG_Shutdown(void);
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#endif // INCLUDED_MPEG_H
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