diff options
Diffstat (limited to 'mpeglib/lib/util/audio/audioIO_HPUX.cpp')
| -rw-r--r-- | mpeglib/lib/util/audio/audioIO_HPUX.cpp | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/mpeglib/lib/util/audio/audioIO_HPUX.cpp b/mpeglib/lib/util/audio/audioIO_HPUX.cpp new file mode 100644 index 00000000..ae07a148 --- /dev/null +++ b/mpeglib/lib/util/audio/audioIO_HPUX.cpp @@ -0,0 +1,190 @@ +/* this file is a part of amp software, (C) tomislav uzelac 1996,1997 + + Origional code by: Lutz Vieweg + Modified by: + * Andrew Richards - moved code from audio.c + + */ + + +#include <sys/audio.h> +#include <fcntl.h> +#include <sys/ioctl.h> +#include <sys/lock.h> +#include <unistd.h> +#include <stdio.h> +#include "audioIO.h" + +/* declare these static to effectively isolate the audio device */ + +static int audio_fd; + + +/* audioOpen() */ +/* should open the audio device, perform any special initialization */ +/* Set the frequency, no of channels and volume. Volume is only set if */ +/* it is not -1 */ + +void audioOpen() { + if ((audio_fd = open("/dev/audio",O_RDWR))==-1) + die(" unable to open the audio device\n"); + + DB(audio, msg("Audio device opened on %d\n",audio_fd); ) + } + + +void +audioInit(int sampleSize,int frequency, int stereo) +{ + int flags; + int failed = 0; + int volume=100; + + if ((flags = fcntl (audio_fd, F_GETFL, 0)) < 0) { + die("unable to set non-blocking mode for /dev/audio\n"); + } + flags |= O_NDELAY; + if (fcntl (audio_fd, F_SETFL, flags) < 0) { + die("unable to set non-blocking mode for /dev/audio\n"); + } + + if ( ioctl(audio_fd, AUDIO_SET_DATA_FORMAT, AUDIO_FORMAT_LINEAR16BIT) < 0 || + ioctl(audio_fd, AUDIO_SET_CHANNELS, stereo ? 2 : 1) < 0 || + ioctl(audio_fd, AUDIO_SET_OUTPUT, AUDIO_OUT_SPEAKER | AUDIO_OUT_HEADPHONE + | AUDIO_OUT_LINE) < 0 || + ioctl(audio_fd, AUDIO_SET_SAMPLE_RATE, frequency) < 0) { + failed = -1; + } + if (volume != -1) { + struct audio_describe description; + struct audio_gains gains; + float fvolume = (float)volume / 100.0f; + if (ioctl(audio_fd, AUDIO_DESCRIBE, &description)) { + failed = -1; + } + if (ioctl (audio_fd, AUDIO_GET_GAINS, &gains)) { + failed = -1; + } + + gains.transmit_gain = (int)((float)description.min_transmit_gain + + (float)(description.max_transmit_gain + - description.min_transmit_gain) + * fvolume); + + /* gains.monitor_gain = description.min_monitor_gain; */ /* don't monitor ! */ + + if (ioctl (audio_fd, AUDIO_SET_GAINS, &gains)) { + failed = -1; + } + } + + if (ioctl(audio_fd, AUDIO_SET_TXBUFSIZE, 4096 * 8)) { + failed = -1; + } + if (failed) + die(" unable to setup /dev/audio\n"); +} + + +/* audioSetVolume - only code this if your system can change the volume while */ +/* playing. sets the output volume 0-100 */ + +void +audioSetVolume(int volume) +{ + struct audio_describe description; + struct audio_gains gains; + int failed = 0; + float fvolume = ((float)volume) / 100.0f; + if (ioctl(audio_fd, AUDIO_DESCRIBE, &description)) { + failed = -1; + } + if (ioctl (audio_fd, AUDIO_GET_GAINS, &gains)) { + failed = -1; +} + + gains.transmit_gain = (int)((float)description.min_transmit_gain + + (float)(description.max_transmit_gain + - description.min_transmit_gain) + * fvolume); + if (ioctl (audio_fd, AUDIO_SET_GAINS, &gains)) { + failed = -1; + } + + /* could evaluate "failed" here - but who cares? */ + + DB(audio, msg("volume set to %d%%\n",volume); ) + +} + +/* audioFlush() */ +/* should flush the audio device */ + +inline void +audioFlush() +{ + DB(audio, msg("audio: flush %d\n",audio_fd) ); +} + + +/* audioClose() */ +/* should close the audio device and perform any special shutdown */ + +void +audioClose() +{ + close(audio_fd); + DB(audio, msg("audio: closed %d\n",audio_fd) ); +} + + +/* audioWrite */ +/* writes count bytes from buffer to the audio device */ +/* returns the number of bytes actually written */ + +int audioWrite(char *buffer, int count) +{ + DB(audio, msg("audio: Writing %d bytes to audio descriptor %d\n",count,getAudioFd()) ); + return(write(audio_fd,buffer,count)); +} + + +/* Let buffer.c have the audio descriptor so it can select on it. This means */ +/* that the program is dependent on an file descriptor to work. Should really */ +/* move the select's etc (with inlines of course) in here so that this is the */ +/* ONLY file which has hardware dependent audio stuff in it */ + +int +getAudioFd() +{ + return(audio_fd); +} + +/* + Try to set the priority of this process to a value which + allows us to play without buffering, thus saving memory + and avoiding cache-misses. + If we cannot get any priority high enough to allow for + undisturbed replay (because we don't have sufficient + privilege), return a zero, otherwise, return a one. +*/ +int audioSetPriority(void) { + + /* try to lock process in physical memory, just ignore if this fails */ + plock(PROCSHLIBLOCK); + + /* try to set a realtime-priority of 64 */ + if (-1 != rtprio(0, 64)) { + DB(audio, msg("using real-time priority\n"); ) + return 1; + } + + /* try to set a nice-level of -20 */ + if (-1 != nice(-20)) { + DB(audio, msg("using nice-level -20\n"); ) + return 1; + } + + DB(audio, msg("using buffered output\n"); ) + return 0; /* need to use a buffer */ +} |