337 lines
8.3 KiB
C
337 lines
8.3 KiB
C
/*--------------------------------------------------------------+
|
|
| audplay.c Simple routines to play audio using an AVIStream to |
|
|
| get data. Uses global variables, so only one instance at a |
|
|
| time. (Usually, there's only one sound card, so this isn't |
|
|
| so bad. |
|
|
+--------------------------------------------------------------*/
|
|
|
|
#include <windows.h>
|
|
#include <windowsx.h>
|
|
#include <win32.h>
|
|
#include <mmsystem.h>
|
|
#include <vfw.h>
|
|
#include "audplay.h"
|
|
|
|
/*--------------------------------------------------------------+
|
|
| ****************** AUDIO PLAYING SUPPORT ******************** |
|
|
+--------------------------------------------------------------*/
|
|
|
|
static HWAVEOUT shWaveOut = 0; /* Current MCI device ID */
|
|
static LONG slBegin;
|
|
static LONG slCurrent;
|
|
static LONG slEnd;
|
|
static BOOL sfLooping;
|
|
static BOOL sfPlaying = FALSE;
|
|
|
|
#define MAX_AUDIO_BUFFERS 16
|
|
#define MIN_AUDIO_BUFFERS 2
|
|
#define AUDIO_BUFFER_SIZE 16384
|
|
|
|
static UINT swBuffers; // total # buffers
|
|
static UINT swBuffersOut; // buffers device has
|
|
static UINT swNextBuffer; // next buffer to fill
|
|
static LPWAVEHDR salpAudioBuf[MAX_AUDIO_BUFFERS];
|
|
|
|
static PAVISTREAM spavi; // stream we're playing
|
|
static LONG slSampleSize; // size of an audio sample
|
|
|
|
static LONG sdwBytesPerSec;
|
|
static LONG sdwSamplesPerSec;
|
|
|
|
#ifndef WIN32
|
|
extern LONG FAR PASCAL muldiv32(LONG, LONG, LONG);
|
|
#endif
|
|
|
|
/*---------------------------------------------------------------+
|
|
| aviaudioCloseDevice -- close the open audio device, if any. |
|
|
+---------------------------------------------------------------*/
|
|
void NEAR aviaudioCloseDevice(void)
|
|
{
|
|
UINT w;
|
|
|
|
if (shWaveOut) {
|
|
while (swBuffers > 0) {
|
|
--swBuffers;
|
|
waveOutUnprepareHeader(shWaveOut, salpAudioBuf[swBuffers],
|
|
sizeof(WAVEHDR));
|
|
GlobalFreePtr((LPBYTE) salpAudioBuf[swBuffers]);
|
|
}
|
|
|
|
w = waveOutClose(shWaveOut);
|
|
|
|
// DPF("AudioCloseDevice: waveOutClose returns %u\n", w);
|
|
shWaveOut = NULL;
|
|
}
|
|
}
|
|
|
|
/*--------------------------------------------------------------+
|
|
| aviaudioOpenDevice -- get ready to play waveform data. |
|
|
+--------------------------------------------------------------*/
|
|
BOOL FAR aviaudioOpenDevice(HWND hwnd, PAVISTREAM pavi)
|
|
{
|
|
UINT w;
|
|
LPVOID lpFormat;
|
|
LONG cbFormat;
|
|
AVISTREAMINFO strhdr;
|
|
|
|
if (!pavi) // no wave data to play
|
|
return FALSE;
|
|
|
|
if (shWaveOut) // already something playing
|
|
return TRUE;
|
|
|
|
spavi = pavi;
|
|
|
|
AVIStreamInfo(pavi, &strhdr, sizeof(strhdr));
|
|
|
|
slSampleSize = (LONG) strhdr.dwSampleSize;
|
|
if (slSampleSize <= 0 || slSampleSize > AUDIO_BUFFER_SIZE)
|
|
return FALSE;
|
|
|
|
AVIStreamFormatSize(pavi, 0, &cbFormat);
|
|
|
|
lpFormat = GlobalAllocPtr(GHND, cbFormat);
|
|
if (!lpFormat)
|
|
return FALSE;
|
|
|
|
AVIStreamReadFormat(pavi, 0, lpFormat, &cbFormat);
|
|
|
|
sdwSamplesPerSec = ((LPWAVEFORMAT) lpFormat)->nSamplesPerSec;
|
|
sdwBytesPerSec = ((LPWAVEFORMAT) lpFormat)->nAvgBytesPerSec;
|
|
|
|
w = waveOutOpen(&shWaveOut, WAVE_MAPPER, lpFormat,
|
|
(DWORD) (UINT) hwnd, 0L, CALLBACK_WINDOW);
|
|
|
|
//
|
|
// Maybe we failed because someone is playing sound already.
|
|
// Shut any sound off, and try once more before giving up.
|
|
//
|
|
if (w) {
|
|
sndPlaySound(NULL, 0);
|
|
w = waveOutOpen(&shWaveOut, WAVE_MAPPER, lpFormat,
|
|
(DWORD) (UINT) hwnd, 0L, CALLBACK_WINDOW);
|
|
}
|
|
|
|
// DPF("waveOutOpen returns %u, shWaveOut = %u\n", w, shWaveOut);
|
|
|
|
if (w != 0) {
|
|
/* Show error message here? */
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
for (swBuffers = 0; swBuffers < MAX_AUDIO_BUFFERS; swBuffers++) {
|
|
if (!(salpAudioBuf[swBuffers] =
|
|
(LPWAVEHDR)GlobalAllocPtr(GMEM_MOVEABLE | GMEM_SHARE,
|
|
(DWORD)(sizeof(WAVEHDR) + AUDIO_BUFFER_SIZE))))
|
|
break;
|
|
salpAudioBuf[swBuffers]->dwFlags = WHDR_DONE;
|
|
salpAudioBuf[swBuffers]->lpData = (LPBYTE) salpAudioBuf[swBuffers]
|
|
+ sizeof(WAVEHDR);
|
|
salpAudioBuf[swBuffers]->dwBufferLength = AUDIO_BUFFER_SIZE;
|
|
if (!waveOutPrepareHeader(shWaveOut, salpAudioBuf[swBuffers],
|
|
sizeof(WAVEHDR)))
|
|
continue;
|
|
|
|
GlobalFreePtr((LPBYTE) salpAudioBuf[swBuffers]);
|
|
break;
|
|
}
|
|
|
|
// DPF("Allocated %u %lu-byte buffers.\n", swBuffers, (DWORD) AUDIO_BUFFER_SIZE);
|
|
|
|
if (swBuffers < MIN_AUDIO_BUFFERS) {
|
|
aviaudioCloseDevice();
|
|
return FALSE;
|
|
}
|
|
|
|
swBuffersOut = 0;
|
|
swNextBuffer = 0;
|
|
|
|
sfPlaying = FALSE;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
//
|
|
// Return the time in milliseconds corresponding to the currently playing
|
|
// audio sample, or -1 if no audio is playing.
|
|
// WARNING: Some sound cards are pretty inaccurate!
|
|
//
|
|
LONG FAR aviaudioTime(void)
|
|
{
|
|
MMTIME mmtime;
|
|
|
|
if (!sfPlaying)
|
|
return -1;
|
|
|
|
mmtime.wType = TIME_SAMPLES;
|
|
|
|
waveOutGetPosition(shWaveOut, &mmtime, sizeof(mmtime));
|
|
|
|
if (mmtime.wType == TIME_SAMPLES)
|
|
return AVIStreamSampleToTime(spavi, slBegin)
|
|
+ muldiv32(mmtime.u.sample, 1000, sdwSamplesPerSec);
|
|
else if (mmtime.wType == TIME_BYTES)
|
|
return AVIStreamSampleToTime(spavi, slBegin)
|
|
+ muldiv32(mmtime.u.cb, 1000, sdwBytesPerSec);
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
|
|
//
|
|
// Fill up any empty audio buffers and ship them out to the device.
|
|
//
|
|
BOOL NEAR aviaudioiFillBuffers(void)
|
|
{
|
|
LONG lRead;
|
|
UINT w;
|
|
LONG lSamplesToPlay;
|
|
|
|
/* We're not playing, so do nothing. */
|
|
if (!sfPlaying)
|
|
return TRUE;
|
|
|
|
// DPF3("%u/%u (%lu-%lu)\n", swBuffersOut, swBuffers, slCurrent, slEnd);
|
|
|
|
while (swBuffersOut < swBuffers) {
|
|
if (slCurrent >= slEnd) {
|
|
if (sfLooping) {
|
|
/* Looping, so go to the beginning. */
|
|
slCurrent = slBegin;
|
|
} else
|
|
break;
|
|
}
|
|
|
|
/* Figure out how much data should go in this buffer */
|
|
lSamplesToPlay = slEnd - slCurrent;
|
|
if (lSamplesToPlay > AUDIO_BUFFER_SIZE / slSampleSize)
|
|
lSamplesToPlay = AUDIO_BUFFER_SIZE / slSampleSize;
|
|
|
|
|
|
AVIStreamRead(spavi, slCurrent, lSamplesToPlay,
|
|
salpAudioBuf[swNextBuffer]->lpData,
|
|
AUDIO_BUFFER_SIZE,
|
|
&salpAudioBuf[swNextBuffer]->dwBufferLength,
|
|
&lRead);
|
|
|
|
if (lRead != lSamplesToPlay) {
|
|
// DPF("Error from WAVE_READ\n");
|
|
return FALSE;
|
|
}
|
|
slCurrent += lRead;
|
|
|
|
w = waveOutWrite(shWaveOut, salpAudioBuf[swNextBuffer],sizeof(WAVEHDR));
|
|
|
|
if (w != 0) {
|
|
// DPF("Error from waveOutWrite\n");
|
|
return FALSE;
|
|
}
|
|
|
|
++swBuffersOut;
|
|
++swNextBuffer;
|
|
if (swNextBuffer >= swBuffers)
|
|
swNextBuffer = 0;
|
|
}
|
|
|
|
if (swBuffersOut == 0 && slCurrent >= slEnd)
|
|
aviaudioStop();
|
|
|
|
/* We've filled all of the buffers we can or want to. */
|
|
return TRUE;
|
|
}
|
|
|
|
/*--------------------------------------------------------------+
|
|
| aviaudioPlay -- Play audio, starting at a given frame |
|
|
| |
|
|
+--------------------------------------------------------------*/
|
|
BOOL FAR aviaudioPlay(HWND hwnd, PAVISTREAM pavi, LONG lStart, LONG lEnd, BOOL fWait)
|
|
{
|
|
if (!aviaudioOpenDevice(hwnd, pavi))
|
|
return FALSE;
|
|
|
|
if (lStart < 0)
|
|
lStart = AVIStreamStart(pavi);
|
|
|
|
if (lEnd < 0)
|
|
lEnd = AVIStreamEnd(pavi);
|
|
|
|
// DPF2("Audio play%s from %ld to %ld (samples)\n", ((LPSTR) (fWait ? " wait" : "")), lStart, lEnd);
|
|
|
|
if (lStart >= lEnd)
|
|
return TRUE;
|
|
|
|
if (!sfPlaying) {
|
|
|
|
//
|
|
// We're beginning play, so pause until we've filled the buffers
|
|
// for a seamless start
|
|
//
|
|
waveOutPause(shWaveOut);
|
|
|
|
slBegin = lStart;
|
|
slCurrent = lStart;
|
|
slEnd = lEnd;
|
|
sfPlaying = TRUE;
|
|
} else {
|
|
if (lStart > slEnd) {
|
|
// DPF("Gap in wave that is supposed to be played!\n");
|
|
}
|
|
slEnd = lEnd;
|
|
}
|
|
|
|
// sfLooping = fLoop;
|
|
|
|
aviaudioiFillBuffers();
|
|
|
|
//
|
|
// Now unpause the audio and away it goes!
|
|
//
|
|
waveOutRestart(shWaveOut);
|
|
|
|
//
|
|
// Caller wants us not to return until play is finished
|
|
//
|
|
if (fWait) {
|
|
while (swBuffersOut > 0)
|
|
Yield();
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/*--------------------------------------------------------------+
|
|
| aviaudioMessage -- handle wave messages received by |
|
|
| window controlling audio playback. When audio buffers are |
|
|
| done, this routine calls aviaudioiFillBuffers to fill them |
|
|
| up again. |
|
|
+--------------------------------------------------------------*/
|
|
void FAR aviaudioMessage(HWND hwnd, unsigned msg, WPARAM wParam, LPARAM lParam)
|
|
{
|
|
if (msg == MM_WOM_DONE) {
|
|
--swBuffersOut;
|
|
aviaudioiFillBuffers();
|
|
}
|
|
}
|
|
|
|
|
|
/*--------------------------------------------------------------+
|
|
| aviaudioStop -- stop playing, close the device. |
|
|
+--------------------------------------------------------------*/
|
|
void FAR aviaudioStop(void)
|
|
{
|
|
UINT w;
|
|
|
|
if (shWaveOut != 0) {
|
|
|
|
w = waveOutReset(shWaveOut);
|
|
|
|
sfPlaying = FALSE;
|
|
|
|
// DPF("AudioStop: waveOutReset() returns %u \n", w);
|
|
|
|
aviaudioCloseDevice();
|
|
}
|
|
}
|