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/* -*- 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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|
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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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|
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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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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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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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|
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#include "rdesktop.h" |
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#include "rdpsnd.h" |
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#include "rdpsnd_dsp.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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|
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#define DEFAULTDEVICE "/dev/dsp" |
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#define MAX_LEN 512 |
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|
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static int snd_rate; |
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static short samplewidth; |
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static char *dsp_dev; |
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static struct audio_driver oss_driver; |
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|
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BOOL |
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oss_open(void) |
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{ |
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if ((g_dsp_fd = open(dsp_dev, O_WRONLY)) == -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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|
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return True; |
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} |
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|
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void |
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oss_close(void) |
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{ |
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close(g_dsp_fd); |
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} |
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|
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BOOL |
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oss_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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|
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return True; |
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} |
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|
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BOOL |
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oss_set_format(WAVEFORMATEX * pwfx) |
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{ |
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int stereo, format, fragments; |
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static BOOL driver_broken = False; |
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|
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ioctl(g_dsp_fd, SNDCTL_DSP_RESET, NULL); |
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ioctl(g_dsp_fd, SNDCTL_DSP_SYNC, NULL); |
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|
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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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|
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samplewidth = pwfx->wBitsPerSample / 8; |
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|
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if (ioctl(g_dsp_fd, SNDCTL_DSP_SETFMT, &format) == -1) |
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{ |
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perror("SNDCTL_DSP_SETFMT"); |
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close(g_dsp_fd); |
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return False; |
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} |
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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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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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|
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if (ioctl(g_dsp_fd, SNDCTL_DSP_STEREO, &stereo) == -1) |
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{ |
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perror("SNDCTL_DSP_CHANNELS"); |
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close(g_dsp_fd); |
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return False; |
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} |
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|
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snd_rate = pwfx->nSamplesPerSec; |
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if (ioctl(g_dsp_fd, SNDCTL_DSP_SPEED, &snd_rate) == -1) |
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{ |
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perror("SNDCTL_DSP_SPEED"); |
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close(g_dsp_fd); |
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return False; |
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} |
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|
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/* try to get 12 fragments of 2^12 bytes size */ |
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fragments = (12 << 16) + 12; |
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ioctl(g_dsp_fd, SNDCTL_DSP_SETFRAGMENT, &fragments); |
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|
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if (!driver_broken) |
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{ |
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audio_buf_info info; |
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|
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memset(&info, 0, sizeof(info)); |
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if (ioctl(g_dsp_fd, SNDCTL_DSP_GETOSPACE, &info) == -1) |
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{ |
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perror("SNDCTL_DSP_GETOSPACE"); |
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close(g_dsp_fd); |
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return False; |
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} |
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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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driver_broken = True; |
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} |
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} |
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|
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return True; |
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} |
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|
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void |
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oss_volume(uint16 left, uint16 right) |
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{ |
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uint32 volume; |
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|
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volume = left / (65536 / 100); |
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volume |= right / (65536 / 100) << 8; |
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|
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if (ioctl(g_dsp_fd, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1) |
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{ |
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warning("hardware volume control unavailable, falling back to software volume control!\n"); |
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oss_driver.wave_out_volume = rdpsnd_dsp_softvol_set; |
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rdpsnd_dsp_softvol_set(left, right); |
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return; |
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} |
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} |
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|
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void |
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oss_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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|
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if (rdpsnd_queue_empty()) |
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{ |
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g_dsp_busy = 0; |
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return; |
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} |
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|
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packet = rdpsnd_queue_current_packet(); |
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out = &packet->s; |
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|
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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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|
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len = out->end - out->p; |
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|
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len = write(g_dsp_fd, out->p, (len > MAX_LEN) ? MAX_LEN : 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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g_dsp_busy = 1; |
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return; |
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} |
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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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|
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gettimeofday(&tv, NULL); |
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duration = (out->size * (1000000 / (samplewidth * snd_rate))); |
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elapsed = (tv.tv_sec - startedat_s) * 1000000 + (tv.tv_usec - startedat_us); |
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|
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if (elapsed >= (duration * 85) / 100) |
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{ |
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/* We need to add 50 to tell windows that time has passed while |
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* playing this packet */ |
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rdpsnd_send_completion(packet->tick + 50, packet->index); |
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rdpsnd_queue_next(); |
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started = False; |
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} |
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else |
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{ |
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g_dsp_busy = 1; |
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return; |
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} |
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} |
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g_dsp_busy = 1; |
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return; |
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} |
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|
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struct audio_driver * |
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oss_register(char *options) |
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{ |
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oss_driver.wave_out_write = rdpsnd_queue_write; |
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oss_driver.wave_out_open = oss_open; |
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oss_driver.wave_out_close = oss_close; |
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oss_driver.wave_out_format_supported = oss_format_supported; |
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oss_driver.wave_out_set_format = oss_set_format; |
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oss_driver.wave_out_volume = oss_volume; |
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oss_driver.wave_out_play = oss_play; |
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oss_driver.name = xstrdup("oss"); |
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oss_driver.description = |
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xstrdup("OSS output driver, default device: " DEFAULTDEVICE " or $AUDIODEV"); |
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oss_driver.need_byteswap_on_be = 0; |
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oss_driver.next = NULL; |
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|
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if (options) |
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{ |
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dsp_dev = xstrdup(options); |
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} |
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else |
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{ |
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dsp_dev = getenv("AUDIODEV"); |
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|
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if (dsp_dev == NULL) |
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{ |
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dsp_dev = xstrdup(DEFAULTDEVICE); |
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} |
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} |
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|
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return &oss_driver; |
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} |
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