164 lines
4.0 KiB
C
164 lines
4.0 KiB
C
/*
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Audio File Library
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Copyright (c) 1998-1999, Michael Pruett <michael@68k.org>
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Copyright (c) 2001, Silicon Graphics, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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linuxtest.c
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This file plays a 16-bit, 44.1 kHz monophonic or stereophonic
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audio file through a PC sound card on a Linux system. This file
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will not compile under any operating system that does not support
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the Open Sound System API.
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*/
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <linux/soundcard.h>
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#include <audiofile.h>
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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/*
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If it's not defined already, define the native audio hardware
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byte order.
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*/
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#ifndef AFMT_S16_NE
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#ifdef WORDS_BIGENDIAN /* defined in config.h */
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#define AFMT_S16_NE AFMT_S16_BE
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#else
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#define AFMT_S16_NE AFMT_S16_LE
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#endif /* WORDS_BIGENDIAN */
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#endif /* AFMT_S16_NE */
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void setupdsp (int audiofd, int channelCount, int frequency);
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void usage (void);
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/* BUFFER_FRAMES represents the size of the buffer in frames. */
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#define BUFFER_FRAMES 4096
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int main (int argc, char **argv)
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{
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if (argc != 2)
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usage();
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AFfilehandle file = afOpenFile(argv[1], "r", NULL);
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AFframecount frameCount = afGetFrameCount(file, AF_DEFAULT_TRACK);
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printf("frame count: %jd\n", (intmax_t) frameCount);
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int channelCount = afGetVirtualChannels(file, AF_DEFAULT_TRACK);
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int sampleFormat, sampleWidth;
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afGetVirtualSampleFormat(file, AF_DEFAULT_TRACK, &sampleFormat,
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&sampleWidth);
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double frequency = afGetRate(file, AF_DEFAULT_TRACK);
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float frameSize = afGetVirtualFrameSize(file, AF_DEFAULT_TRACK, 1);
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printf("sample format: %d, sample width: %d, channels: %d\n",
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sampleFormat, sampleWidth, channelCount);
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if ((sampleFormat != AF_SAMPFMT_TWOSCOMP) &&
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(sampleFormat != AF_SAMPFMT_UNSIGNED))
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{
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fprintf(stderr, "The audio file must contain integer data in two's complement or unsigned format.\n");
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exit(EXIT_FAILURE);
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}
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if ((sampleWidth != 16) || (channelCount > 2))
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{
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fprintf(stderr, "The audio file must be of a 16-bit monophonic or stereophonic format.\n");
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exit(EXIT_FAILURE);
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}
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void *buffer = malloc(BUFFER_FRAMES * frameSize);
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int audiofd = open("/dev/dsp", O_WRONLY);
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if (audiofd < 0)
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{
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perror("open");
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exit(EXIT_FAILURE);
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}
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setupdsp(audiofd, channelCount, frequency);
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while (1)
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{
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AFframecount framesRead = afReadFrames(file, AF_DEFAULT_TRACK, buffer,
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BUFFER_FRAMES);
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if (framesRead <= 0)
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break;
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printf("read %jd frames\n", (intmax_t) framesRead);
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ssize_t bytesWritten = write(audiofd, buffer, framesRead * frameSize);
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if (bytesWritten < 0)
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break;
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}
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close(audiofd);
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free(buffer);
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return 0;
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}
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void setupdsp (int audiofd, int channelCount, int frequency)
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{
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int format = AFMT_S16_NE;
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if (ioctl(audiofd, SNDCTL_DSP_SETFMT, &format) == -1)
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{
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perror("set format");
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exit(EXIT_FAILURE);
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}
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if (format != AFMT_S16_NE)
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{
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fprintf(stderr, "format not correct.\n");
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exit(EXIT_FAILURE);
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}
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if (ioctl(audiofd, SNDCTL_DSP_CHANNELS, &channelCount) == -1)
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{
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perror("set channels");
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exit(EXIT_FAILURE);
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}
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if (ioctl(audiofd, SNDCTL_DSP_SPEED, &frequency) == -1)
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{
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perror("set frequency");
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exit(EXIT_FAILURE);
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}
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}
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void usage (void)
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{
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fprintf(stderr, "usage: linuxtest file\n");
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fprintf(stderr,
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"where file refers to a 16-bit monophonic or stereophonic 44.1 kHz audio file\n");
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exit(EXIT_FAILURE);
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}
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