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320 lines
6.3 KiB
C
320 lines
6.3 KiB
C
/* -*- c-basic-offset: 8 -*-
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rdesktop: A Remote Desktop Protocol client.
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Sound Channel Process Functions - Open Sound System
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Copyright (C) Matthew Chapman 2003
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Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
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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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This is a workaround for Esound bug 312665.
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FIXME: Remove this when Esound is fixed.
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*/
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#ifdef _FILE_OFFSET_BITS
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#undef _FILE_OFFSET_BITS
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#endif
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#include "rdesktop.h"
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <sys/ioctl.h>
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#include <sys/soundcard.h>
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#define MAX_QUEUE 10
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int This->dsp_;
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BOOL This->dsp_bu = False;
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static int g_snd_rate;
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static short g_samplewidth;
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static BOOL g_driver_broken = False;
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static struct audio_packet
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{
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struct stream s;
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uint16 tick;
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uint8 index;
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} packet_queue[MAX_QUEUE];
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static unsigned int queue_hi, queue_lo;
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BOOL
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wave_out_open(void)
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{
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char *dsp_dev = getenv("AUDIODEV");
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if (dsp_dev == NULL)
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{
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dsp_dev = xstrdup("/dev/dsp");
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}
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if ((This->dsp_ = open(dsp_dev, O_WRONLY | O_NONBLOCK)) == -1)
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{
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perror(dsp_dev);
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return False;
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}
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/* Non-blocking so that user interface is responsive */
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fcntl(This->dsp_, F_SETFL, fcntl(This->dsp_, F_GETFL) | O_NONBLOCK);
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return True;
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}
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void
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wave_out_close(void)
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{
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close(This->dsp_);
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}
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BOOL
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wave_out_format_supported(WAVEFORMATEX * pwfx)
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{
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if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
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return False;
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if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
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return False;
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if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
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return False;
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return True;
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}
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BOOL
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wave_out_set_format(WAVEFORMATEX * pwfx)
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{
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int stereo, format, fragments;
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ioctl(This->dsp_, SNDCTL_DSP_RESET, NULL);
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ioctl(This->dsp_, SNDCTL_DSP_SYNC, NULL);
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if (pwfx->wBitsPerSample == 8)
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format = AFMT_U8;
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else if (pwfx->wBitsPerSample == 16)
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format = AFMT_S16_LE;
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g_samplewidth = pwfx->wBitsPerSample / 8;
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if (ioctl(This->dsp_, SNDCTL_DSP_SETFMT, &format) == -1)
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{
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perror("SNDCTL_DSP_SETFMT");
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close(This->dsp_);
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return False;
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}
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if (pwfx->nChannels == 2)
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{
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stereo = 1;
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g_samplewidth *= 2;
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}
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else
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{
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stereo = 0;
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}
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if (ioctl(This->dsp_, SNDCTL_DSP_STEREO, &stereo) == -1)
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{
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perror("SNDCTL_DSP_CHANNELS");
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close(This->dsp_);
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return False;
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}
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g_snd_rate = pwfx->nSamplesPerSec;
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if (ioctl(This->dsp_, SNDCTL_DSP_SPEED, &g_snd_rate) == -1)
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{
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perror("SNDCTL_DSP_SPEED");
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close(This->dsp_);
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return False;
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}
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/* try to get 7 fragments of 2^12 bytes size */
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fragments = (7 << 16) + 12;
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ioctl(This->dsp_, SNDCTL_DSP_SETFRAGMENT, &fragments);
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if (!g_driver_broken)
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{
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audio_buf_info info;
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memset(&info, 0, sizeof(info));
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if (ioctl(This->dsp_, SNDCTL_DSP_GETOSPACE, &info) == -1)
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{
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perror("SNDCTL_DSP_GETOSPACE");
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close(This->dsp_);
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return False;
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}
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if (info.fragments == 0 || info.fragstotal == 0 || info.fragsize == 0)
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{
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fprintf(stderr,
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"Broken OSS-driver detected: fragments: %d, fragstotal: %d, fragsize: %d\n",
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info.fragments, info.fragstotal, info.fragsize);
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g_driver_broken = True;
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}
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}
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return True;
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}
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void
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wave_out_volume(uint16 left, uint16 right)
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{
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static BOOL use_dev_mixer = False;
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uint32 volume;
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int fd_mix = -1;
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volume = left / (65536 / 100);
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volume |= right / (65536 / 100) << 8;
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if (use_dev_mixer)
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{
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if ((fd_mix = open("/dev/mixer", O_RDWR | O_NONBLOCK)) == -1)
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{
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perror("open /dev/mixer");
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return;
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}
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if (ioctl(fd_mix, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
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{
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perror("MIXER_WRITE(SOUND_MIXER_PCM)");
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return;
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}
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close(fd_mix);
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}
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if (ioctl(This->dsp_, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
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{
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perror("MIXER_WRITE(SOUND_MIXER_PCM)");
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use_dev_mixer = True;
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return;
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}
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}
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void
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wave_out_write(STREAM s, uint16 tick, uint8 index)
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{
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struct audio_packet *packet = &packet_queue[queue_hi];
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unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;
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if (next_hi == queue_lo)
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{
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error("No space to queue audio packet\n");
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return;
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}
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queue_hi = next_hi;
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packet->s = *s;
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packet->tick = tick;
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packet->index = index;
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packet->s.p += 4;
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/* we steal the data buffer from s, give it a new one */
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s->data = (uint8 *) malloc(s->size);
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if (!This->dsp_bu)
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wave_out_play();
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}
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void
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wave_out_play(void)
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{
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struct audio_packet *packet;
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ssize_t len;
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STREAM out;
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static long startedat_us;
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static long startedat_s;
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static BOOL started = False;
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struct timeval tv;
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audio_buf_info info;
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while (1)
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{
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if (queue_lo == queue_hi)
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{
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This->dsp_bu = 0;
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return;
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}
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packet = &packet_queue[queue_lo];
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out = &packet->s;
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if (!started)
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{
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gettimeofday(&tv, NULL);
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startedat_us = tv.tv_usec;
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startedat_s = tv.tv_sec;
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started = True;
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}
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len = out->end - out->p;
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if (!g_driver_broken)
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{
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memset(&info, 0, sizeof(info));
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if (ioctl(This->dsp_, SNDCTL_DSP_GETOSPACE, &info) == -1)
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{
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perror("SNDCTL_DSP_GETOSPACE");
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return;
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}
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if (info.fragments == 0)
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{
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This->dsp_bu = 1;
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return;
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}
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if (info.fragments * info.fragsize < len
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&& info.fragments * info.fragsize > 0)
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{
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len = info.fragments * info.fragsize;
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}
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}
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len = write(This->dsp_, out->p, len);
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if (len == -1)
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{
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if (errno != EWOULDBLOCK)
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perror("write audio");
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This->dsp_bu = 1;
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return;
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}
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out->p += len;
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if (out->p == out->end)
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{
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long long duration;
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long elapsed;
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gettimeofday(&tv, NULL);
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duration = (out->size * (1000000 / (g_samplewidth * g_snd_rate)));
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elapsed = (tv.tv_sec - startedat_s) * 1000000 + (tv.tv_usec - startedat_us);
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if (elapsed >= (duration * 85) / 100)
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{
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rdpsnd_send_completion(packet->tick, packet->index);
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free(out->data);
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queue_lo = (queue_lo + 1) % MAX_QUEUE;
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started = False;
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}
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else
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{
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This->dsp_bu = 1;
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return;
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}
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}
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}
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}
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