playwave.c
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/*
PLAYWAVE: A test application for the SDL mixer library.
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Copyright (C) 1997-2004 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
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This library 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 GNU
Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
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slouken@libsdl.org
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*/
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/* $Id$ */
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
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#ifdef unix
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#include <unistd.h>
#endif
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#include "SDL.h"
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#include "SDL_mixer.h"
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/*
* rcg06132001 various mixer tests. Define the ones you want.
*/
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/*#define TEST_MIX_VERSIONS*/
/*#define TEST_MIX_CHANNELFINISHED*/
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/*#define TEST_MIX_PANNING*/
/*#define TEST_MIX_DISTANCE*/
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/*#define TEST_MIX_POSITION*/
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#if (defined TEST_MIX_POSITION)
#if (defined TEST_MIX_PANNING)
#error TEST_MIX_POSITION interferes with TEST_MIX_PANNING.
#endif
#if (defined TEST_MIX_DISTANCE)
#error TEST_MIX_POSITION interferes with TEST_MIX_DISTANCE.
#endif
#endif
/* rcg06192001 for debugging purposes. */
static void output_test_warnings(void)
{
#if (defined TEST_MIX_CHANNELFINISHED)
fprintf(stderr, "Warning: TEST_MIX_CHANNELFINISHED is enabled in this binary...\n");
#endif
#if (defined TEST_MIX_PANNING)
fprintf(stderr, "Warning: TEST_MIX_PANNING is enabled in this binary...\n");
#endif
#if (defined TEST_MIX_VERSIONS)
fprintf(stderr, "Warning: TEST_MIX_VERSIONS is enabled in this binary...\n");
#endif
#if (defined TEST_MIX_DISTANCE)
fprintf(stderr, "Warning: TEST_MIX_DISTANCE is enabled in this binary...\n");
#endif
#if (defined TEST_MIX_POSITION)
fprintf(stderr, "Warning: TEST_MIX_POSITION is enabled in this binary...\n");
#endif
}
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static int audio_open = 0;
static Mix_Chunk *wave = NULL;
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/* rcg06192001 Check new Mixer version API. */
#if (defined TEST_MIX_VERSIONS)
static void output_versions(const char *libname, const SDL_version *compiled,
const SDL_version *linked)
{
fprintf(stderr,
"This program was compiled against %s %d.%d.%d,\n"
" and is dynamically linked to %d.%d.%d.\n", libname,
compiled->major, compiled->minor, compiled->patch,
linked->major, linked->minor, linked->patch);
}
static void test_versions(void)
{
SDL_version compiled;
const SDL_version *linked;
SDL_VERSION(&compiled);
linked = SDL_Linked_Version();
output_versions("SDL", &compiled, linked);
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SDL_MIXER_VERSION(&compiled);
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linked = Mix_Linked_Version();
output_versions("SDL_mixer", &compiled, linked);
}
#endif
#ifdef TEST_MIX_CHANNELFINISHED /* rcg06072001 */
static volatile int channel_is_done = 0;
static void channel_complete_callback(int chan)
{
Mix_Chunk *done_chunk = Mix_GetChunk(chan);
fprintf(stderr, "We were just alerted that Mixer channel #%d is done.\n", chan);
fprintf(stderr, "Channel's chunk pointer is (%p).\n", done_chunk);
fprintf(stderr, " Which %s correct.\n", (wave == done_chunk) ? "is" : "is NOT");
channel_is_done = 1;
}
#endif
/* rcg06192001 abstract this out for testing purposes. */
static int still_playing(void)
{
#ifdef TEST_MIX_CHANNELFINISHED
return(!channel_is_done);
#else
return(Mix_Playing(0));
#endif
}
#if (defined TEST_MIX_PANNING)
static void do_panning_update(void)
{
static Uint8 leftvol = 128;
static Uint8 rightvol = 128;
static Uint8 leftincr = -1;
static Uint8 rightincr = 1;
static int panningok = 1;
static Uint32 next_panning_update = 0;
if ((panningok) && (SDL_GetTicks() >= next_panning_update)) {
panningok = Mix_SetPanning(0, leftvol, rightvol);
if (!panningok) {
fprintf(stderr, "Mix_SetPanning(0, %d, %d) failed!\n",
(int) leftvol, (int) rightvol);
fprintf(stderr, "Reason: [%s].\n", Mix_GetError());
}
if ((leftvol == 255) || (leftvol == 0)) {
if (leftvol == 255)
printf("All the way in the left speaker.\n");
leftincr *= -1;
}
if ((rightvol == 255) || (rightvol == 0)) {
if (rightvol == 255)
printf("All the way in the right speaker.\n");
rightincr *= -1;
}
leftvol += leftincr;
rightvol += rightincr;
next_panning_update = SDL_GetTicks() + 10;
}
}
#endif
#if (defined TEST_MIX_DISTANCE)
static void do_distance_update(void)
{
static Uint8 distance = 1;
static Uint8 distincr = 1;
static int distanceok = 1;
static Uint32 next_distance_update = 0;
if ((distanceok) && (SDL_GetTicks() >= next_distance_update)) {
distanceok = Mix_SetDistance(0, distance);
if (!distanceok) {
fprintf(stderr, "Mix_SetDistance(0, %d) failed!\n", (int) distance);
fprintf(stderr, "Reason: [%s].\n", Mix_GetError());
}
if (distance == 0) {
printf("Distance at nearest point.\n");
distincr *= -1;
}
else if (distance == 255) {
printf("Distance at furthest point.\n");
distincr *= -1;
}
distance += distincr;
next_distance_update = SDL_GetTicks() + 15;
}
}
#endif
#if (defined TEST_MIX_POSITION)
static void do_position_update(void)
{
static Sint16 distance = 1;
static Sint8 distincr = 1;
static Uint16 angle = 0;
static Sint8 angleincr = 1;
static int positionok = 1;
static Uint32 next_position_update = 0;
if ((positionok) && (SDL_GetTicks() >= next_position_update)) {
positionok = Mix_SetPosition(0, angle, distance);
if (!positionok) {
fprintf(stderr, "Mix_SetPosition(0, %d, %d) failed!\n",
(int) angle, (int) distance);
fprintf(stderr, "Reason: [%s].\n", Mix_GetError());
}
if (angle == 0) {
printf("Due north; now rotating clockwise...\n");
angleincr = 1;
}
else if (angle == 360) {
printf("Due north; now rotating counter-clockwise...\n");
angleincr = -1;
}
distance += distincr;
if (distance < 0) {
distance = 0;
distincr = 3;
printf("Distance is very, very near. Stepping away by threes...\n");
} else if (distance > 255) {
distance = 255;
distincr = -3;
printf("Distance is very, very far. Stepping towards by threes...\n");
}
angle += angleincr;
next_position_update = SDL_GetTicks() + 30;
}
}
#endif
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static void CleanUp(int exitcode)
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{
if ( wave ) {
Mix_FreeChunk(wave);
wave = NULL;
}
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if ( audio_open ) {
Mix_CloseAudio();
audio_open = 0;
}
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SDL_Quit();
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exit(exitcode);
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}
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static void Usage(char *argv0)
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{
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fprintf(stderr, "Usage: %s [-8] [-r rate] [-c channels] [-f] [-F] [-l] [-m] <wavefile>\n", argv0);
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}
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/*
* rcg06182001 This is sick, but cool.
*
* Actually, it's meant to be an example of how to manipulate a voice
* without having to use the mixer effects API. This is more processing
* up front, but no extra during the mixing process. Also, in a case like
* this, when you need to touch the whole sample at once, it's the only
* option you've got. And, with the effects API, you are altering a copy of
* the original sample for each playback, and thus, your changes aren't
* permanent; here, you've got a reversed sample, and that's that until
* you either reverse it again, or reload it.
*/
static void flip_sample(Mix_Chunk *wave)
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Uint16 format;
int channels, i, incr;
Uint8 *start = wave->abuf;
Uint8 *end = wave->abuf + wave->alen;
Mix_QuerySpec(NULL, &format, &channels);
incr = (format & 0xFF) * channels;
end -= incr;
switch (incr) {
case 8:
for (i = wave->alen / 2; i >= 0; i -= 1) {
Uint8 tmp = *start;
*start = *end;
*end = tmp;
start++;
end--;
}
break;
case 16:
for (i = wave->alen / 2; i >= 0; i -= 2) {
Uint16 tmp = *start;
*((Uint16 *) start) = *((Uint16 *) end);
*((Uint16 *) end) = tmp;
start += 2;
end -= 2;
}
break;
case 32:
for (i = wave->alen / 2; i >= 0; i -= 4) {
Uint32 tmp = *start;
*((Uint32 *) start) = *((Uint32 *) end);
*((Uint32 *) end) = tmp;
start += 4;
end -= 4;
}
break;
default:
fprintf(stderr, "Unhandled format in sample flipping.\n");
return;
}
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int main(int argc, char *argv[])
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{
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int audio_rate;
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Uint16 audio_format;
int audio_channels;
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int loops = 0;
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int i;
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int reverse_stereo = 0;
int reverse_sample = 0;
setbuf(stdout, NULL); /* rcg06132001 for debugging purposes. */
setbuf(stderr, NULL); /* rcg06192001 for debugging purposes, too. */
output_test_warnings();
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/* Initialize variables */
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audio_rate = MIX_DEFAULT_FREQUENCY;
audio_format = MIX_DEFAULT_FORMAT;
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audio_channels = 2;
/* Check command line usage */
for ( i=1; argv[i] && (*argv[i] == '-'); ++i ) {
if ( (strcmp(argv[i], "-r") == 0) && argv[i+1] ) {
++i;
audio_rate = atoi(argv[i]);
} else
if ( strcmp(argv[i], "-m") == 0 ) {
audio_channels = 1;
} else
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if ( (strcmp(argv[i], "-c") == 0) && argv[i+1] ) {
++i;
audio_channels = atoi(argv[i]);
} else
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if ( strcmp(argv[i], "-l") == 0 ) {
loops = -1;
} else
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if ( strcmp(argv[i], "-8") == 0 ) {
audio_format = AUDIO_U8;
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} else
if ( strcmp(argv[i], "-f") == 0 ) { /* rcg06122001 flip stereo */
reverse_stereo = 1;
} else
if ( strcmp(argv[i], "-F") == 0 ) { /* rcg06172001 flip sample */
reverse_sample = 1;
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} else {
Usage(argv[0]);
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return(1);
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}
}
if ( ! argv[i] ) {
Usage(argv[0]);
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return(1);
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}
/* Initialize the SDL library */
if ( SDL_Init(SDL_INIT_AUDIO) < 0 ) {
fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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return(255);
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}
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signal(SIGINT, CleanUp);
signal(SIGTERM, CleanUp);
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/* Open the audio device */
if (Mix_OpenAudio(audio_rate, audio_format, audio_channels, 4096) < 0) {
fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError());
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CleanUp(2);
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} else {
Mix_QuerySpec(&audio_rate, &audio_format, &audio_channels);
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printf("Opened audio at %d Hz %d bit %s", audio_rate,
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(audio_format&0xFF),
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(audio_channels > 2) ? "surround" :
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(audio_channels > 1) ? "stereo" : "mono");
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if ( loops ) {
printf(" (looping)\n");
} else {
putchar('\n');
}
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}
audio_open = 1;
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#if (defined TEST_MIX_VERSIONS)
test_versions();
#endif
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/* Load the requested wave file */
wave = Mix_LoadWAV(argv[i]);
if ( wave == NULL ) {
fprintf(stderr, "Couldn't load %s: %s\n",
argv[i], SDL_GetError());
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CleanUp(2);
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}
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if (reverse_sample) {
flip_sample(wave);
}
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#ifdef TEST_MIX_CHANNELFINISHED /* rcg06072001 */
Mix_ChannelFinished(channel_complete_callback);
#endif
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if ( (!Mix_SetReverseStereo(MIX_CHANNEL_POST, reverse_stereo)) &&
(reverse_stereo) )
{
printf("Failed to set up reverse stereo effect!\n");
printf("Reason: [%s].\n", Mix_GetError());
}
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/* Play and then exit */
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Mix_PlayChannel(0, wave, loops);
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while (still_playing()) {
#if (defined TEST_MIX_PANNING) /* rcg06132001 */
do_panning_update();
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#endif
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#if (defined TEST_MIX_DISTANCE) /* rcg06192001 */
do_distance_update();
#endif
#if (defined TEST_MIX_POSITION) /* rcg06202001 */
do_position_update();
#endif
SDL_Delay(1);
} /* while still_playing() loop... */
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CleanUp(0);
/* Not reached, but fixes compiler warnings */
return 0;
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}
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/* end of playwave.c ... */