playwave.c
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上传日期:2022-07-21
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- /*
- PLAYWAVE: A test application for the SDL mixer library.
- Copyright (C) 1997-2009 Sam Lantinga
- 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.
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- Sam Lantinga
- slouken@libsdl.org
- */
- /* $Id: playwave.c 5191 2009-11-05 00:02:50Z slouken $ */
- #include <stdlib.h>
- #include <stdio.h>
- #include <string.h>
- #include <signal.h>
- #ifdef unix
- #include <unistd.h>
- #endif
- #include "SDL.h"
- #include "SDL_mixer.h"
- /*
- * rcg06132001 various mixer tests. Define the ones you want.
- */
- /*#define TEST_MIX_DECODERS*/
- /*#define TEST_MIX_VERSIONS*/
- /*#define TEST_MIX_CHANNELFINISHED*/
- /*#define TEST_MIX_PANNING*/
- /*#define TEST_MIX_DISTANCE*/
- /*#define TEST_MIX_POSITION*/
- #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
- }
- static int audio_open = 0;
- static Mix_Chunk *wave = NULL;
- /* rcg06042009 Report available decoders. */
- #if (defined TEST_MIX_DECODERS)
- static void report_decoders(void)
- {
- int i, total;
- printf("Supported decoders...n");
- total = Mix_GetNumChunkDecoders();
- for (i = 0; i < total; i++) {
- fprintf(stderr, " - chunk decoder: %sn", Mix_GetChunkDecoder(i));
- }
- total = Mix_GetNumMusicDecoders();
- for (i = 0; i < total; i++) {
- fprintf(stderr, " - music decoder: %sn", Mix_GetMusicDecoder(i));
- }
- }
- #endif
- /* 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);
- SDL_MIXER_VERSION(&compiled);
- 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
- static void CleanUp(int exitcode)
- {
- if ( wave ) {
- Mix_FreeChunk(wave);
- wave = NULL;
- }
- if ( audio_open ) {
- Mix_CloseAudio();
- audio_open = 0;
- }
- SDL_Quit();
- exit(exitcode);
- }
- static void Usage(char *argv0)
- {
- fprintf(stderr, "Usage: %s [-8] [-r rate] [-c channels] [-f] [-F] [-l] [-m] <wavefile>n", argv0);
- }
- /*
- * 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)
- {
- 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;
- }
- }
- int main(int argc, char *argv[])
- {
- int audio_rate;
- Uint16 audio_format;
- int audio_channels;
- int loops = 0;
- int i;
- 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();
- /* Initialize variables */
- audio_rate = MIX_DEFAULT_FREQUENCY;
- audio_format = MIX_DEFAULT_FORMAT;
- 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
- if ( (strcmp(argv[i], "-c") == 0) && argv[i+1] ) {
- ++i;
- audio_channels = atoi(argv[i]);
- } else
- if ( strcmp(argv[i], "-l") == 0 ) {
- loops = -1;
- } else
- if ( strcmp(argv[i], "-8") == 0 ) {
- audio_format = AUDIO_U8;
- } 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;
- } else {
- Usage(argv[0]);
- return(1);
- }
- }
- if ( ! argv[i] ) {
- Usage(argv[0]);
- return(1);
- }
- /* Initialize the SDL library */
- if ( SDL_Init(SDL_INIT_AUDIO) < 0 ) {
- fprintf(stderr, "Couldn't initialize SDL: %sn",SDL_GetError());
- return(255);
- }
- signal(SIGINT, CleanUp);
- signal(SIGTERM, CleanUp);
- /* Open the audio device */
- if (Mix_OpenAudio(audio_rate, audio_format, audio_channels, 4096) < 0) {
- fprintf(stderr, "Couldn't open audio: %sn", SDL_GetError());
- CleanUp(2);
- } else {
- Mix_QuerySpec(&audio_rate, &audio_format, &audio_channels);
- printf("Opened audio at %d Hz %d bit %s", audio_rate,
- (audio_format&0xFF),
- (audio_channels > 2) ? "surround" :
- (audio_channels > 1) ? "stereo" : "mono");
- if ( loops ) {
- printf(" (looping)n");
- } else {
- putchar('n');
- }
- }
- audio_open = 1;
- #if (defined TEST_MIX_VERSIONS)
- test_versions();
- #endif
- #if (defined TEST_MIX_DECODERS)
- report_decoders();
- #endif
- /* Load the requested wave file */
- wave = Mix_LoadWAV(argv[i]);
- if ( wave == NULL ) {
- fprintf(stderr, "Couldn't load %s: %sn",
- argv[i], SDL_GetError());
- CleanUp(2);
- }
- if (reverse_sample) {
- flip_sample(wave);
- }
- #ifdef TEST_MIX_CHANNELFINISHED /* rcg06072001 */
- Mix_ChannelFinished(channel_complete_callback);
- #endif
- 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());
- }
- /* Play and then exit */
- Mix_PlayChannel(0, wave, loops);
- while (still_playing()) {
- #if (defined TEST_MIX_PANNING) /* rcg06132001 */
- do_panning_update();
- #endif
- #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... */
- CleanUp(0);
- /* Not reached, but fixes compiler warnings */
- return 0;
- }
- /* end of playwave.c ... */