mirror of
https://github.com/mpv-player/mpv
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66b1d0d001
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@19620 b3059339-0415-0410-9bf9-f77b7e298cf2
625 lines
21 KiB
C
625 lines
21 KiB
C
/******************************************************************************
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* ao_dsound.c: Windows DirectSound interface for MPlayer
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* Copyright (c) 2004 Gabor Szecsi <deje@miki.hu>
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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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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/**
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\todo verify/extend multichannel support
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <windows.h>
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#define DIRECTSOUND_VERSION 0x0600
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#include <dsound.h>
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#include <math.h>
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#include "config.h"
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#include "libaf/af_format.h"
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#include "audio_out.h"
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#include "audio_out_internal.h"
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#include "mp_msg.h"
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#include "libvo/fastmemcpy.h"
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#include "osdep/timer.h"
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#include "subopt-helper.h"
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static ao_info_t info =
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{
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"Windows DirectSound audio output",
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"dsound",
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"Gabor Szecsi <deje@miki.hu>",
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""
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};
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LIBAO_EXTERN(dsound)
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/**
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\todo use the definitions from the win32 api headers when they define these
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*/
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#if 1
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#define WAVE_FORMAT_IEEE_FLOAT 0x0003
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#define WAVE_FORMAT_DOLBY_AC3_SPDIF 0x0092
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#define WAVE_FORMAT_EXTENSIBLE 0xFFFE
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static const GUID KSDATAFORMAT_SUBTYPE_PCM = {0x1,0x0000,0x0010, {0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71}};
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#define SPEAKER_FRONT_LEFT 0x1
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#define SPEAKER_FRONT_RIGHT 0x2
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#define SPEAKER_FRONT_CENTER 0x4
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#define SPEAKER_LOW_FREQUENCY 0x8
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#define SPEAKER_BACK_LEFT 0x10
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#define SPEAKER_BACK_RIGHT 0x20
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#define SPEAKER_FRONT_LEFT_OF_CENTER 0x40
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#define SPEAKER_FRONT_RIGHT_OF_CENTER 0x80
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#define SPEAKER_BACK_CENTER 0x100
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#define SPEAKER_SIDE_LEFT 0x200
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#define SPEAKER_SIDE_RIGHT 0x400
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#define SPEAKER_TOP_CENTER 0x800
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#define SPEAKER_TOP_FRONT_LEFT 0x1000
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#define SPEAKER_TOP_FRONT_CENTER 0x2000
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#define SPEAKER_TOP_FRONT_RIGHT 0x4000
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#define SPEAKER_TOP_BACK_LEFT 0x8000
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#define SPEAKER_TOP_BACK_CENTER 0x10000
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#define SPEAKER_TOP_BACK_RIGHT 0x20000
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#define SPEAKER_RESERVED 0x80000000
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#define DSSPEAKER_HEADPHONE 0x00000001
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#define DSSPEAKER_MONO 0x00000002
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#define DSSPEAKER_QUAD 0x00000003
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#define DSSPEAKER_STEREO 0x00000004
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#define DSSPEAKER_SURROUND 0x00000005
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#define DSSPEAKER_5POINT1 0x00000006
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#ifndef _WAVEFORMATEXTENSIBLE_
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typedef struct {
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WAVEFORMATEX Format;
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union {
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WORD wValidBitsPerSample; /* bits of precision */
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WORD wSamplesPerBlock; /* valid if wBitsPerSample==0 */
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WORD wReserved; /* If neither applies, set to zero. */
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} Samples;
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DWORD dwChannelMask; /* which channels are */
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/* present in stream */
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GUID SubFormat;
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} WAVEFORMATEXTENSIBLE, *PWAVEFORMATEXTENSIBLE;
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#endif
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#endif
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static const int channel_mask[] = {
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SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | SPEAKER_LOW_FREQUENCY,
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SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | SPEAKER_BACK_LEFT | SPEAKER_BACK_RIGHT,
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SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | SPEAKER_BACK_LEFT | SPEAKER_BACK_RIGHT | SPEAKER_LOW_FREQUENCY,
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SPEAKER_FRONT_LEFT | SPEAKER_FRONT_CENTER | SPEAKER_FRONT_RIGHT | SPEAKER_BACK_LEFT | SPEAKER_BACK_RIGHT | SPEAKER_LOW_FREQUENCY
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};
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static HINSTANCE hdsound_dll = NULL; ///handle to the dll
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static LPDIRECTSOUND hds = NULL; ///direct sound object
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static LPDIRECTSOUNDBUFFER hdspribuf = NULL; ///primary direct sound buffer
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static LPDIRECTSOUNDBUFFER hdsbuf = NULL; ///secondary direct sound buffer (stream buffer)
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static int buffer_size = 0; ///size in bytes of the direct sound buffer
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static int write_offset = 0; ///offset of the write cursor in the direct sound buffer
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static int min_free_space = 0; ///if the free space is below this value get_space() will return 0
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///there will always be at least this amout of free space to prevent
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///get_space() from returning wrong values when buffer is 100% full.
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///will be replaced with nBlockAlign in init()
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static int device_num = 0; ///wanted device number
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static GUID device; ///guid of the device
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/***************************************************************************************/
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/**
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\brief output error message
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\param err error code
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\return string with the error message
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*/
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static char * dserr2str(int err)
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{
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switch (err) {
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case DS_OK: return "DS_OK";
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case DS_NO_VIRTUALIZATION: return "DS_NO_VIRTUALIZATION";
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case DSERR_ALLOCATED: return "DS_NO_VIRTUALIZATION";
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case DSERR_CONTROLUNAVAIL: return "DSERR_CONTROLUNAVAIL";
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case DSERR_INVALIDPARAM: return "DSERR_INVALIDPARAM";
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case DSERR_INVALIDCALL: return "DSERR_INVALIDCALL";
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case DSERR_GENERIC: return "DSERR_GENERIC";
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case DSERR_PRIOLEVELNEEDED: return "DSERR_PRIOLEVELNEEDED";
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case DSERR_OUTOFMEMORY: return "DSERR_OUTOFMEMORY";
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case DSERR_BADFORMAT: return "DSERR_BADFORMAT";
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case DSERR_UNSUPPORTED: return "DSERR_UNSUPPORTED";
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case DSERR_NODRIVER: return "DSERR_NODRIVER";
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case DSERR_ALREADYINITIALIZED: return "DSERR_ALREADYINITIALIZED";
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case DSERR_NOAGGREGATION: return "DSERR_NOAGGREGATION";
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case DSERR_BUFFERLOST: return "DSERR_BUFFERLOST";
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case DSERR_OTHERAPPHASPRIO: return "DSERR_OTHERAPPHASPRIO";
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case DSERR_UNINITIALIZED: return "DSERR_UNINITIALIZED";
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case DSERR_NOINTERFACE: return "DSERR_NOINTERFACE";
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case DSERR_ACCESSDENIED: return "DSERR_ACCESSDENIED";
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default: return "unknown";
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}
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}
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/**
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\brief uninitialize direct sound
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*/
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static void UninitDirectSound(void)
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{
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// finally release the DirectSound object
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if (hds) {
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IDirectSound_Release(hds);
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hds = NULL;
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}
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// free DSOUND.DLL
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if (hdsound_dll) {
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FreeLibrary(hdsound_dll);
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hdsound_dll = NULL;
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}
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mp_msg(MSGT_AO, MSGL_V, "ao_dsound: DirectSound uninitialized\n");
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}
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/**
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\brief print the commandline help
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*/
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static void print_help(void)
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{
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mp_msg(MSGT_AO, MSGL_FATAL,
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"\n-ao dsound commandline help:\n"
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"Example: mplayer -ao dsound:device=1\n"
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" sets 1st device\n"
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"\nOptions:\n"
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" device=<device-number>\n"
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" Sets device number, use -v to get a list\n");
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}
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/**
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\brief enumerate direct sound devices
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\return TRUE to continue with the enumeration
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*/
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static BOOL CALLBACK DirectSoundEnum(LPGUID guid,LPCSTR desc,LPCSTR module,LPVOID context)
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{
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int* device_index=context;
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mp_msg(MSGT_AO, MSGL_V,"%i %s ",*device_index,desc);
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if(device_num==*device_index){
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mp_msg(MSGT_AO, MSGL_V,"<--");
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if(guid){
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memcpy(&device,guid,sizeof(GUID));
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}
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}
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mp_msg(MSGT_AO, MSGL_V,"\n");
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(*device_index)++;
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return TRUE;
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}
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/**
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\brief initilize direct sound
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\return 0 if error, 1 if ok
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*/
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static int InitDirectSound(void)
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{
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DSCAPS dscaps;
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// initialize directsound
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HRESULT (WINAPI *OurDirectSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
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HRESULT (WINAPI *OurDirectSoundEnumerate)(LPDSENUMCALLBACKA, LPVOID);
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int device_index=0;
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opt_t subopts[] = {
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{"device", OPT_ARG_INT, &device_num,NULL},
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{NULL}
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};
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if (subopt_parse(ao_subdevice, subopts) != 0) {
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print_help();
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return 0;
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}
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hdsound_dll = LoadLibrary("DSOUND.DLL");
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if (hdsound_dll == NULL) {
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mp_msg(MSGT_AO, MSGL_ERR, "ao_dsound: cannot load DSOUND.DLL\n");
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return 0;
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}
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OurDirectSoundCreate = (void*)GetProcAddress(hdsound_dll, "DirectSoundCreate");
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OurDirectSoundEnumerate = (void*)GetProcAddress(hdsound_dll, "DirectSoundEnumerateA");
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if (OurDirectSoundCreate == NULL || OurDirectSoundEnumerate == NULL) {
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mp_msg(MSGT_AO, MSGL_ERR, "ao_dsound: GetProcAddress FAILED\n");
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FreeLibrary(hdsound_dll);
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return 0;
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}
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// Enumerate all directsound devices
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mp_msg(MSGT_AO, MSGL_V,"ao_dsound: Output Devices:\n");
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OurDirectSoundEnumerate(DirectSoundEnum,&device_index);
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// Create the direct sound object
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if FAILED(OurDirectSoundCreate((device_num)?&device:NULL, &hds, NULL )) {
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mp_msg(MSGT_AO, MSGL_ERR, "ao_dsound: cannot create a DirectSound device\n");
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FreeLibrary(hdsound_dll);
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return 0;
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}
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/* Set DirectSound Cooperative level, ie what control we want over Windows
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* sound device. In our case, DSSCL_EXCLUSIVE means that we can modify the
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* settings of the primary buffer, but also that only the sound of our
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* application will be hearable when it will have the focus.
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* !!! (this is not really working as intended yet because to set the
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* cooperative level you need the window handle of your application, and
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* I don't know of any easy way to get it. Especially since we might play
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* sound without any video, and so what window handle should we use ???
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* The hack for now is to use the Desktop window handle - it seems to be
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* working */
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if (IDirectSound_SetCooperativeLevel(hds, GetDesktopWindow(), DSSCL_EXCLUSIVE)) {
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mp_msg(MSGT_AO, MSGL_ERR, "ao_dsound: cannot set direct sound cooperative level\n");
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IDirectSound_Release(hds);
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FreeLibrary(hdsound_dll);
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return 0;
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}
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mp_msg(MSGT_AO, MSGL_V, "ao_dsound: DirectSound initialized\n");
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memset(&dscaps, 0, sizeof(DSCAPS));
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dscaps.dwSize = sizeof(DSCAPS);
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if (DS_OK == IDirectSound_GetCaps(hds, &dscaps)) {
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if (dscaps.dwFlags & DSCAPS_EMULDRIVER) mp_msg(MSGT_AO, MSGL_V, "ao_dsound: DirectSound is emulated, waveOut may give better performance\n");
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} else {
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mp_msg(MSGT_AO, MSGL_V, "ao_dsound: cannot get device capabilities\n");
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}
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return 1;
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}
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/**
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\brief destroy the direct sound buffer
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*/
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static void DestroyBuffer(void)
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{
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if (hdsbuf) {
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IDirectSoundBuffer_Release(hdsbuf);
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hdsbuf = NULL;
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}
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if (hdspribuf) {
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IDirectSoundBuffer_Release(hdspribuf);
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hdspribuf = NULL;
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}
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}
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/**
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\brief fill sound buffer
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\param data pointer to the sound data to copy
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\param len length of the data to copy in bytes
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\return number of copyed bytes
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*/
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static int write_buffer(unsigned char *data, int len)
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{
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HRESULT res;
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LPVOID lpvPtr1;
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DWORD dwBytes1;
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LPVOID lpvPtr2;
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DWORD dwBytes2;
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// Lock the buffer
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res = IDirectSoundBuffer_Lock(hdsbuf,write_offset, len, &lpvPtr1, &dwBytes1, &lpvPtr2, &dwBytes2, 0);
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// If the buffer was lost, restore and retry lock.
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if (DSERR_BUFFERLOST == res)
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{
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IDirectSoundBuffer_Restore(hdsbuf);
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res = IDirectSoundBuffer_Lock(hdsbuf,write_offset, len, &lpvPtr1, &dwBytes1, &lpvPtr2, &dwBytes2, 0);
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}
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if (SUCCEEDED(res))
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{
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if( (ao_data.channels == 6) && (ao_data.format!=AF_FORMAT_AC3) ) {
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// reorder channels while writing to pointers.
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// it's this easy because buffer size and len are always
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// aligned to multiples of channels*bytespersample
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// there's probably some room for speed improvements here
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const int chantable[6] = {0, 1, 4, 5, 2, 3}; // reorder "matrix"
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int i, j;
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int numsamp,sampsize;
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sampsize = af_fmt2bits(ao_data.format)>>3; // bytes per sample
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numsamp = dwBytes1 / (ao_data.channels * sampsize); // number of samples for each channel in this buffer
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for( i = 0; i < numsamp; i++ ) for( j = 0; j < ao_data.channels; j++ ) {
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memcpy(lpvPtr1+(i*ao_data.channels*sampsize)+(chantable[j]*sampsize),data+(i*ao_data.channels*sampsize)+(j*sampsize),sampsize);
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}
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if (NULL != lpvPtr2 )
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{
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numsamp = dwBytes2 / (ao_data.channels * sampsize);
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for( i = 0; i < numsamp; i++ ) for( j = 0; j < ao_data.channels; j++ ) {
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memcpy(lpvPtr2+(i*ao_data.channels*sampsize)+(chantable[j]*sampsize),data+dwBytes1+(i*ao_data.channels*sampsize)+(j*sampsize),sampsize);
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}
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}
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write_offset+=dwBytes1+dwBytes2;
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if(write_offset>=buffer_size)write_offset=dwBytes2;
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} else {
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// Write to pointers without reordering.
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memcpy(lpvPtr1,data,dwBytes1);
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if (NULL != lpvPtr2 )memcpy(lpvPtr2,data+dwBytes1,dwBytes2);
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write_offset+=dwBytes1+dwBytes2;
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if(write_offset>=buffer_size)write_offset=dwBytes2;
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}
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// Release the data back to DirectSound.
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res = IDirectSoundBuffer_Unlock(hdsbuf,lpvPtr1,dwBytes1,lpvPtr2,dwBytes2);
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if (SUCCEEDED(res))
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{
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// Success.
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DWORD status;
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IDirectSoundBuffer_GetStatus(hdsbuf, &status);
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if (!(status & DSBSTATUS_PLAYING)){
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res = IDirectSoundBuffer_Play(hdsbuf, 0, 0, DSBPLAY_LOOPING);
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}
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return dwBytes1+dwBytes2;
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}
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}
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// Lock, Unlock, or Restore failed.
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return 0;
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}
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/***************************************************************************************/
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/**
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\brief handle control commands
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\param cmd command
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\param arg argument
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\return CONTROL_OK or -1 in case the command can't be handled
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*/
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static int control(int cmd, void *arg)
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{
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DWORD volume;
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switch (cmd) {
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case AOCONTROL_GET_VOLUME: {
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ao_control_vol_t* vol = (ao_control_vol_t*)arg;
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IDirectSoundBuffer_GetVolume(hdsbuf, &volume);
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vol->left = vol->right = pow(10.0, (float)(volume+10000) / 5000.0);
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//printf("ao_dsound: volume: %f\n",vol->left);
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return CONTROL_OK;
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}
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case AOCONTROL_SET_VOLUME: {
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ao_control_vol_t* vol = (ao_control_vol_t*)arg;
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volume = (DWORD)(log10(vol->right) * 5000.0) - 10000;
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IDirectSoundBuffer_SetVolume(hdsbuf, volume);
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//printf("ao_dsound: volume: %f\n",vol->left);
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return CONTROL_OK;
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}
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}
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return -1;
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}
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/**
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\brief setup sound device
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\param rate samplerate
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\param channels number of channels
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\param format format
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\param flags unused
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\return 1=success 0=fail
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*/
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static int init(int rate, int channels, int format, int flags)
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{
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int res;
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if (!InitDirectSound()) return 0;
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// ok, now create the buffers
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WAVEFORMATEXTENSIBLE wformat;
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DSBUFFERDESC dsbpridesc;
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DSBUFFERDESC dsbdesc;
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//check if the format is supported in general
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switch(format){
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case AF_FORMAT_AC3:
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case AF_FORMAT_S24_LE:
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case AF_FORMAT_S16_LE:
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case AF_FORMAT_S8:
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break;
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default:
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mp_msg(MSGT_AO, MSGL_V,"ao_dsound: format %s not supported defaulting to Signed 16-bit Little-Endian\n",af_fmt2str_short(format));
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format=AF_FORMAT_S16_LE;
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}
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//fill global ao_data
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ao_data.channels = channels;
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ao_data.samplerate = rate;
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ao_data.format = format;
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ao_data.bps = channels * rate * (af_fmt2bits(format)>>3);
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if(ao_data.buffersize==-1) ao_data.buffersize = ao_data.bps; // space for 1 sec
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mp_msg(MSGT_AO, MSGL_V,"ao_dsound: Samplerate:%iHz Channels:%i Format:%s\n", rate, channels, af_fmt2str_short(format));
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mp_msg(MSGT_AO, MSGL_V,"ao_dsound: Buffersize:%d bytes (%d msec)\n", ao_data.buffersize, ao_data.buffersize / ao_data.bps * 1000);
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//fill waveformatex
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ZeroMemory(&wformat, sizeof(WAVEFORMATEXTENSIBLE));
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wformat.Format.cbSize = (channels > 2) ? sizeof(WAVEFORMATEXTENSIBLE)-sizeof(WAVEFORMATEX) : 0;
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wformat.Format.nChannels = channels;
|
|
wformat.Format.nSamplesPerSec = rate;
|
|
if (format == AF_FORMAT_AC3) {
|
|
wformat.Format.wFormatTag = WAVE_FORMAT_DOLBY_AC3_SPDIF;
|
|
wformat.Format.wBitsPerSample = 16;
|
|
wformat.Format.nBlockAlign = 4;
|
|
} else {
|
|
wformat.Format.wFormatTag = (channels > 2) ? WAVE_FORMAT_EXTENSIBLE : WAVE_FORMAT_PCM;
|
|
wformat.Format.wBitsPerSample = af_fmt2bits(format);
|
|
wformat.Format.nBlockAlign = wformat.Format.nChannels * (wformat.Format.wBitsPerSample >> 3);
|
|
}
|
|
|
|
// fill in primary sound buffer descriptor
|
|
memset(&dsbpridesc, 0, sizeof(DSBUFFERDESC));
|
|
dsbpridesc.dwSize = sizeof(DSBUFFERDESC);
|
|
dsbpridesc.dwFlags = DSBCAPS_PRIMARYBUFFER;
|
|
dsbpridesc.dwBufferBytes = 0;
|
|
dsbpridesc.lpwfxFormat = NULL;
|
|
|
|
|
|
// fill in the secondary sound buffer (=stream buffer) descriptor
|
|
memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
|
|
dsbdesc.dwSize = sizeof(DSBUFFERDESC);
|
|
dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2 /** Better position accuracy */
|
|
| DSBCAPS_GLOBALFOCUS /** Allows background playing */
|
|
| DSBCAPS_CTRLVOLUME; /** volume control enabled */
|
|
|
|
if (channels > 2) {
|
|
wformat.dwChannelMask = channel_mask[channels - 3];
|
|
wformat.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
|
|
wformat.Samples.wValidBitsPerSample = wformat.Format.wBitsPerSample;
|
|
// Needed for 5.1 on emu101k - shit soundblaster
|
|
dsbdesc.dwFlags |= DSBCAPS_LOCHARDWARE;
|
|
}
|
|
wformat.Format.nAvgBytesPerSec = wformat.Format.nSamplesPerSec * wformat.Format.nBlockAlign;
|
|
|
|
dsbdesc.dwBufferBytes = ao_data.buffersize;
|
|
dsbdesc.lpwfxFormat = (WAVEFORMATEX *)&wformat;
|
|
buffer_size = dsbdesc.dwBufferBytes;
|
|
write_offset = 0;
|
|
min_free_space = wformat.Format.nBlockAlign;
|
|
ao_data.outburst = wformat.Format.nBlockAlign * 512;
|
|
|
|
// create primary buffer and set its format
|
|
|
|
res = IDirectSound_CreateSoundBuffer( hds, &dsbpridesc, &hdspribuf, NULL );
|
|
if ( res != DS_OK ) {
|
|
UninitDirectSound();
|
|
mp_msg(MSGT_AO, MSGL_ERR,"ao_dsound: cannot create primary buffer (%s)\n", dserr2str(res));
|
|
return 0;
|
|
}
|
|
res = IDirectSoundBuffer_SetFormat( hdspribuf, (WAVEFORMATEX *)&wformat );
|
|
if ( res != DS_OK ) mp_msg(MSGT_AO, MSGL_WARN,"ao_dsound: cannot set primary buffer format (%s), using standard setting (bad quality)", dserr2str(res));
|
|
|
|
mp_msg(MSGT_AO, MSGL_V, "ao_dsound: primary buffer created\n");
|
|
|
|
// now create the stream buffer
|
|
|
|
res = IDirectSound_CreateSoundBuffer(hds, &dsbdesc, &hdsbuf, NULL);
|
|
if (res != DS_OK) {
|
|
if (dsbdesc.dwFlags & DSBCAPS_LOCHARDWARE) {
|
|
// Try without DSBCAPS_LOCHARDWARE
|
|
dsbdesc.dwFlags &= ~DSBCAPS_LOCHARDWARE;
|
|
res = IDirectSound_CreateSoundBuffer(hds, &dsbdesc, &hdsbuf, NULL);
|
|
}
|
|
if (res != DS_OK) {
|
|
UninitDirectSound();
|
|
mp_msg(MSGT_AO, MSGL_ERR, "ao_dsound: cannot create secondary (stream)buffer (%s)\n", dserr2str(res));
|
|
return 0;
|
|
}
|
|
}
|
|
mp_msg(MSGT_AO, MSGL_V, "ao_dsound: secondary (stream)buffer created\n");
|
|
return 1;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
\brief stop playing and empty buffers (for seeking/pause)
|
|
*/
|
|
static void reset(void)
|
|
{
|
|
IDirectSoundBuffer_Stop(hdsbuf);
|
|
// reset directsound buffer
|
|
IDirectSoundBuffer_SetCurrentPosition(hdsbuf, 0);
|
|
write_offset=0;
|
|
}
|
|
|
|
/**
|
|
\brief stop playing, keep buffers (for pause)
|
|
*/
|
|
static void audio_pause(void)
|
|
{
|
|
IDirectSoundBuffer_Stop(hdsbuf);
|
|
}
|
|
|
|
/**
|
|
\brief resume playing, after audio_pause()
|
|
*/
|
|
static void audio_resume(void)
|
|
{
|
|
IDirectSoundBuffer_Play(hdsbuf, 0, 0, DSBPLAY_LOOPING);
|
|
}
|
|
|
|
/**
|
|
\brief close audio device
|
|
\param immed stop playback immediately
|
|
*/
|
|
static void uninit(int immed)
|
|
{
|
|
if(immed)reset();
|
|
else{
|
|
DWORD status;
|
|
IDirectSoundBuffer_Play(hdsbuf, 0, 0, 0);
|
|
while(!IDirectSoundBuffer_GetStatus(hdsbuf,&status) && (status&DSBSTATUS_PLAYING))
|
|
usec_sleep(20000);
|
|
}
|
|
DestroyBuffer();
|
|
UninitDirectSound();
|
|
}
|
|
|
|
/**
|
|
\brief find out how many bytes can be written into the audio buffer without
|
|
\return free space in bytes, has to return 0 if the buffer is almost full
|
|
*/
|
|
static int get_space(void)
|
|
{
|
|
int space;
|
|
DWORD play_offset;
|
|
IDirectSoundBuffer_GetCurrentPosition(hdsbuf,&play_offset,NULL);
|
|
space=buffer_size-(write_offset-play_offset);
|
|
// | | <-- const --> | | |
|
|
// buffer start play_cursor write_cursor write_offset buffer end
|
|
// play_cursor is the actual postion of the play cursor
|
|
// write_cursor is the position after which it is assumed to be save to write data
|
|
// write_offset is the postion where we actually write the data to
|
|
if(space > buffer_size)space -= buffer_size; // write_offset < play_offset
|
|
if(space < min_free_space)return 0;
|
|
return space-min_free_space;
|
|
}
|
|
|
|
/**
|
|
\brief play 'len' bytes of 'data'
|
|
\param data pointer to the data to play
|
|
\param len size in bytes of the data buffer, gets rounded down to outburst*n
|
|
\param flags currently unused
|
|
\return number of played bytes
|
|
*/
|
|
static int play(void* data, int len, int flags)
|
|
{
|
|
DWORD play_offset;
|
|
int space;
|
|
|
|
// make sure we have enough space to write data
|
|
IDirectSoundBuffer_GetCurrentPosition(hdsbuf,&play_offset,NULL);
|
|
space=buffer_size-(write_offset-play_offset);
|
|
if(space > buffer_size)space -= buffer_size; // write_offset < play_offset
|
|
if(space < len) len = space;
|
|
|
|
len = (len / ao_data.outburst) * ao_data.outburst;
|
|
return write_buffer(data, len);
|
|
}
|
|
|
|
/**
|
|
\brief get the delay between the first and last sample in the buffer
|
|
\return delay in seconds
|
|
*/
|
|
static float get_delay(void)
|
|
{
|
|
DWORD play_offset;
|
|
int space;
|
|
IDirectSoundBuffer_GetCurrentPosition(hdsbuf,&play_offset,NULL);
|
|
space=play_offset-write_offset;
|
|
if(space <= 0)space += buffer_size;
|
|
return (float)(buffer_size - space) / (float)ao_data.bps;
|
|
}
|