pacat-simple.c

A simple playback tool using the simple API

00001 /* $Id: pacat-simple.c 1033 2006-06-19 21:53:48Z lennart $ */
00002 
00003 /***
00004   This file is part of PulseAudio.
00005  
00006   PulseAudio is free software; you can redistribute it and/or modify
00007   it under the terms of the GNU Lesser General Public License as published
00008   by the Free Software Foundation; either version 2 of the License,
00009   or (at your option) any later version.
00010  
00011   PulseAudio is distributed in the hope that it will be useful, but
00012   WITHOUT ANY WARRANTY; without even the implied warranty of
00013   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
00014   General Public License for more details.
00015  
00016   You should have received a copy of the GNU Lesser General Public License
00017   along with PulseAudio; if not, write to the Free Software
00018   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00019   USA.
00020 ***/
00021 
00022 #ifdef HAVE_CONFIG_H
00023 #include <config.h>
00024 #endif
00025 
00026 #include <stdio.h>
00027 #include <unistd.h>
00028 #include <string.h>
00029 #include <errno.h>
00030 #include <fcntl.h>
00031 
00032 #include <pulse/simple.h>
00033 #include <pulse/error.h>
00034 #include <pulsecore/gccmacro.h>
00035 
00036 #define BUFSIZE 1024
00037 
00038 int main(PA_GCC_UNUSED int argc, char*argv[]) {
00039 
00040     /* The Sample format to use */
00041     static const pa_sample_spec ss = {
00042         .format = PA_SAMPLE_S16LE,
00043         .rate = 44100,
00044         .channels = 2
00045     };
00046     
00047     pa_simple *s = NULL;
00048     int ret = 1;
00049     int error;
00050 
00051     /* replace STDIN with the specified file if needed */
00052     if (argc > 1) {
00053         int fd;
00054 
00055         if ((fd = open(argv[1], O_RDONLY)) < 0) {
00056             fprintf(stderr, __FILE__": open() failed: %s\n", strerror(errno));
00057             goto finish;
00058         }
00059 
00060         if (dup2(fd, STDIN_FILENO) < 0) {
00061             fprintf(stderr, __FILE__": dup2() failed: %s\n", strerror(errno));
00062             goto finish;
00063         }
00064         
00065         close(fd);
00066     }
00067     
00068     /* Create a new playback stream */
00069     if (!(s = pa_simple_new(NULL, argv[0], PA_STREAM_PLAYBACK, NULL, "playback", &ss, NULL, NULL, &error))) {
00070         fprintf(stderr, __FILE__": pa_simple_new() failed: %s\n", pa_strerror(error));
00071         goto finish;
00072     }
00073 
00074     for (;;) {
00075         uint8_t buf[BUFSIZE];
00076         ssize_t r;
00077 
00078 #if 0
00079         pa_usec_t latency;
00080 
00081         if ((latency = pa_simple_get_latency(s, &error)) == (pa_usec_t) -1) {
00082             fprintf(stderr, __FILE__": pa_simple_get_latency() failed: %s\n", pa_strerror(error));
00083             goto finish;
00084         }
00085 
00086         fprintf(stderr, "%0.0f usec    \r", (float)latency);
00087 #endif
00088 
00089         /* Read some data ... */
00090         if ((r = read(STDIN_FILENO, buf, sizeof(buf))) <= 0) {
00091             if (r == 0) /* EOF */
00092                 break;
00093             
00094             fprintf(stderr, __FILE__": read() failed: %s\n", strerror(errno));
00095             goto finish;
00096         }
00097 
00098         /* ... and play it */
00099         if (pa_simple_write(s, buf, r, &error) < 0) {
00100             fprintf(stderr, __FILE__": pa_simple_write() failed: %s\n", pa_strerror(error));
00101             goto finish;
00102         }
00103     }
00104 
00105     /* Make sure that every single sample was played */
00106     if (pa_simple_drain(s, &error) < 0) {
00107         fprintf(stderr, __FILE__": pa_simple_drain() failed: %s\n", pa_strerror(error));
00108         goto finish;
00109     }
00110 
00111     ret = 0;
00112 
00113 finish:
00114 
00115     if (s)
00116         pa_simple_free(s);
00117     
00118     return ret;
00119 }

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