mirror of
https://github.com/kunkundi/crossdesk.git
synced 2025-10-26 20:25:34 +08:00
106 lines
2.9 KiB
C++
106 lines
2.9 KiB
C++
#include <SDL2/SDL.h>
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#include <stdio.h>
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#include <stdlib.h>
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static SDL_AudioDeviceID input_dev;
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static SDL_AudioDeviceID output_dev;
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static Uint8 *buffer = 0;
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static int in_pos = 0;
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static int out_pos = 0;
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char *out = "audio_old.pcm";
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FILE *outfile = fopen(out, "wb+");
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void cb_in(void *userdata, Uint8 *stream, int len) {
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// If len < 4, the printf below will probably segfault
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// fwrite(stream, 1, len, outfile);
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// fflush(outfile);
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// SDL_memcpy(stream, buffer + in_pos, len);
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// in_pos += len;
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// printf("IN: %d\t%d %d %d %d\n", in_pos, stream[0], stream[1], stream[2],
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// stream[3]);
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}
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void cb_out(void *userdata, Uint8 *stream, int len) {
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// If len < 4, the printf below will probably segfault
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fwrite(stream, 1, len, outfile);
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fflush(outfile);
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// if (out_pos >= in_pos) {
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// // Output is way ahead of input; fill with emptiness
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// memset(buffer + out_pos, 0, len * sizeof(Uint8));
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// printf("OUT: %d\t(Empty)\n", out_pos);
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// } else if (out_pos + len > in_pos) {
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// // Output is reaching input; read until reaching input, and leave the
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// rest
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// // empty
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// memset(buffer + out_pos, 0, len * sizeof(Uint8));
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// SDL_memcpy(buffer + out_pos, stream, in_pos - out_pos);
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// out_pos = in_pos;
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// printf("OUT: %d\t%d %d %d %d (Partial)\n", out_pos, stream[0], stream[1],
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// stream[2], stream[3]);
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// } else {
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// // Input is way ahead of output; read as much as requested
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// SDL_memcpy(buffer + out_pos, stream, len);
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// out_pos += len;
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// printf("OUT: %d\t%d %d %d %d\n", out_pos, stream[0], stream[1],
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// stream[2],
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// stream[3]);
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// }
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// This is to make sure the output device works
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// for (int i = 0; i < len; i++)
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// stream[i] = (Uint8) random();
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}
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int main() {
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SDL_Init(SDL_INIT_AUDIO);
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// 16Mb should be enough; the test lasts 5 seconds
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buffer = (Uint8 *)malloc(16777215);
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SDL_AudioSpec want_in, want_out, have_in, have_out;
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SDL_zero(want_out);
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want_out.freq = 48000;
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want_out.format = AUDIO_U16LSB;
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want_out.channels = 2;
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want_out.samples = 960;
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want_out.callback = cb_out;
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output_dev = SDL_OpenAudioDevice(NULL, 0, &want_out, &have_out,
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SDL_AUDIO_ALLOW_ANY_CHANGE);
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if (output_dev == 0) {
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SDL_Log("Failed to open output: %s", SDL_GetError());
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return 1;
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}
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SDL_zero(want_in);
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want_in.freq = 48000;
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want_in.format = AUDIO_U16LSB;
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want_in.channels = 2;
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want_in.samples = 960;
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want_in.callback = cb_in;
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input_dev = SDL_OpenAudioDevice(NULL, 1, &want_in, &have_in,
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SDL_AUDIO_ALLOW_ANY_CHANGE);
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if (input_dev == 0) {
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SDL_Log("Failed to open input: %s", SDL_GetError());
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return 1;
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}
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SDL_PauseAudioDevice(input_dev, 0);
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SDL_PauseAudioDevice(output_dev, 0);
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SDL_Delay(5000);
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SDL_CloseAudioDevice(output_dev);
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SDL_CloseAudioDevice(input_dev);
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free(buffer);
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fclose(outfile);
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}
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