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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 - alsa-driver |
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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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Copyright (C) Michael Gernoth mike@zerfleddert.de 2006 |
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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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#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 <alsa/asoundlib.h> |
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#include <sys/time.h> |
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|
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#define DEFAULTDEVICE "default" |
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#define MAX_FRAMES 32 |
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|
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static struct pollfd pfds[32]; |
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static int num_fds; |
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|
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static snd_pcm_t *pcm_handle = NULL; |
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static snd_pcm_stream_t stream = SND_PCM_STREAM_PLAYBACK; |
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static BOOL reopened; |
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static short samplewidth; |
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static int audiochannels; |
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static unsigned int rate; |
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static char *pcm_name; |
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|
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void alsa_play(void); |
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|
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void |
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alsa_add_fds(int *n, fd_set * rfds, fd_set * wfds, struct timeval *tv) |
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{ |
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int err; |
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struct pollfd *f; |
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|
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if (!pcm_handle) |
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return; |
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|
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if (rdpsnd_queue_empty()) |
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return; |
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|
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num_fds = snd_pcm_poll_descriptors_count(pcm_handle); |
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|
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if (num_fds > sizeof(pfds) / sizeof(*pfds)) |
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return; |
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|
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err = snd_pcm_poll_descriptors(pcm_handle, pfds, num_fds); |
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if (err < 0) |
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return; |
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|
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for (f = pfds; f < &pfds[num_fds]; f++) |
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{ |
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if (f->events & POLLIN) |
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FD_SET(f->fd, rfds); |
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if (f->events & POLLOUT) |
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FD_SET(f->fd, wfds); |
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if (f->fd > *n && (f->events & (POLLIN | POLLOUT))) |
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*n = f->fd; |
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} |
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} |
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|
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void |
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alsa_check_fds(fd_set * rfds, fd_set * wfds) |
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{ |
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struct pollfd *f; |
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int err; |
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unsigned short revents; |
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|
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if (!pcm_handle) |
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return; |
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|
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for (f = pfds; f < &pfds[num_fds]; f++) |
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{ |
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f->revents = 0; |
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if (f->fd != -1) |
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{ |
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/* Fixme: This doesn't properly deal with things like POLLHUP */ |
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if (FD_ISSET(f->fd, rfds)) |
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f->revents |= POLLIN; |
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if (FD_ISSET(f->fd, wfds)) |
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f->revents |= POLLOUT; |
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} |
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} |
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|
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err = snd_pcm_poll_descriptors_revents(pcm_handle, pfds, num_fds, &revents); |
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if (err < 0) |
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return; |
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|
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if (revents & POLLOUT) |
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alsa_play(); |
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} |
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|
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BOOL |
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alsa_open(void) |
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{ |
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int err; |
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|
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if ((err = snd_pcm_open(&pcm_handle, pcm_name, stream, 0)) < 0) |
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{ |
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error("snd_pcm_open: %s\n", snd_strerror(err)); |
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return False; |
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} |
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|
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reopened = True; |
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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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alsa_close(void) |
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{ |
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/* Ack all remaining packets */ |
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while (!rdpsnd_queue_empty()) |
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rdpsnd_queue_next(0); |
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|
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if (pcm_handle) |
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{ |
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snd_pcm_close(pcm_handle); |
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pcm_handle = NULL; |
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} |
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} |
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|
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BOOL |
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alsa_format_supported(WAVEFORMATEX * pwfx) |
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{ |
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#if 0 |
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int err; |
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snd_pcm_hw_params_t *hwparams = NULL; |
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|
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if ((err = snd_pcm_hw_params_malloc(&hwparams)) < 0) |
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{ |
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error("snd_pcm_hw_params_malloc: %s\n", snd_strerror(err)); |
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return False; |
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} |
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|
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if ((err = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0) |
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{ |
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error("snd_pcm_hw_params_malloc: %s\n", snd_strerror(err)); |
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return False; |
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} |
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snd_pcm_hw_params_free(hwparams); |
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#endif |
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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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if ((pwfx->nSamplesPerSec != 44100) && (pwfx->nSamplesPerSec != 22050)) |
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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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alsa_set_format(WAVEFORMATEX * pwfx) |
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{ |
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snd_pcm_hw_params_t *hwparams = NULL; |
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int err; |
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unsigned int buffertime; |
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|
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samplewidth = pwfx->wBitsPerSample / 8; |
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|
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if ((err = snd_pcm_hw_params_malloc(&hwparams)) < 0) |
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{ |
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error("snd_pcm_hw_params_malloc: %s\n", snd_strerror(err)); |
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return False; |
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} |
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|
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if ((err = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0) |
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{ |
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error("snd_pcm_hw_params_any: %s\n", snd_strerror(err)); |
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return False; |
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} |
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|
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if ((err = |
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snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) |
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{ |
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error("snd_pcm_hw_params_set_access: %s\n", snd_strerror(err)); |
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return False; |
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} |
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|
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if (pwfx->wBitsPerSample == 16) |
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{ |
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if ((err = |
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snd_pcm_hw_params_set_format(pcm_handle, hwparams, SND_PCM_FORMAT_S16_LE)) < 0) |
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{ |
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error("snd_pcm_hw_params_set_format: %s\n", snd_strerror(err)); |
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return False; |
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} |
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} |
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else |
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{ |
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if ((err = |
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snd_pcm_hw_params_set_format(pcm_handle, hwparams, SND_PCM_FORMAT_S8)) < 0) |
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{ |
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error("snd_pcm_hw_params_set_format: %s\n", snd_strerror(err)); |
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return False; |
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} |
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} |
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|
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#if 0 |
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if ((err = snd_pcm_hw_params_set_rate_resample(pcm_handle, hwparams, 1)) < 0) |
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{ |
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error("snd_pcm_hw_params_set_rate_resample: %s\n", snd_strerror(err)); |
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return False; |
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} |
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#endif |
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|
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rate = pwfx->nSamplesPerSec; |
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if ((err = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &rate, 0)) < 0) |
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{ |
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error("snd_pcm_hw_params_set_rate_near: %s\n", snd_strerror(err)); |
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return False; |
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} |
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|
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audiochannels = pwfx->nChannels; |
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if ((err = snd_pcm_hw_params_set_channels(pcm_handle, hwparams, pwfx->nChannels)) < 0) |
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{ |
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error("snd_pcm_hw_params_set_channels: %s\n", snd_strerror(err)); |
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return False; |
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} |
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|
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|
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buffertime = 500000; /* microseconds */ |
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if ((err = |
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snd_pcm_hw_params_set_buffer_time_near(pcm_handle, hwparams, &buffertime, 0)) < 0) |
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{ |
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error("snd_pcm_hw_params_set_buffer_time_near: %s\n", snd_strerror(err)); |
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return False; |
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} |
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|
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if ((err = snd_pcm_hw_params(pcm_handle, hwparams)) < 0) |
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{ |
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error("snd_pcm_hw_params: %s\n", snd_strerror(err)); |
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return False; |
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} |
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|
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snd_pcm_hw_params_free(hwparams); |
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|
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if ((err = snd_pcm_prepare(pcm_handle)) < 0) |
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{ |
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error("snd_pcm_prepare: %s\n", snd_strerror(err)); |
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return False; |
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} |
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|
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reopened = True; |
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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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alsa_play(void) |
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{ |
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struct audio_packet *packet; |
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STREAM out; |
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int len; |
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static long prev_s, prev_us; |
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unsigned int duration; |
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struct timeval tv; |
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int next_tick; |
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|
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if (reopened) |
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{ |
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reopened = False; |
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gettimeofday(&tv, NULL); |
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prev_s = tv.tv_sec; |
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prev_us = tv.tv_usec; |
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} |
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|
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/* We shouldn't be called if the queue is empty, but still */ |
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if (rdpsnd_queue_empty()) |
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return; |
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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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next_tick = rdpsnd_queue_next_tick(); |
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|
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len = (out->end - out->p) / (samplewidth * audiochannels); |
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if ((len = snd_pcm_writei(pcm_handle, out->p, ((MAX_FRAMES < len) ? MAX_FRAMES : len))) < 0) |
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{ |
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snd_pcm_prepare(pcm_handle); |
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len = 0; |
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} |
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out->p += (len * samplewidth * audiochannels); |
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|
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gettimeofday(&tv, NULL); |
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|
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duration = ((tv.tv_sec - prev_s) * 1000000 + (tv.tv_usec - prev_us)) / 1000; |
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|
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if (packet->tick > next_tick) |
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next_tick += 65536; |
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|
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if ((out->p == out->end) || duration > next_tick - packet->tick + 500) |
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{ |
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snd_pcm_sframes_t delay_frames; |
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unsigned long delay_us; |
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|
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prev_s = tv.tv_sec; |
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prev_us = tv.tv_usec; |
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|
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if (abs((next_tick - packet->tick) - duration) > 20) |
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{ |
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DEBUG(("duration: %d, calc: %d, ", duration, next_tick - packet->tick)); |
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DEBUG(("last: %d, is: %d, should: %d\n", packet->tick, |
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(packet->tick + duration) % 65536, next_tick % 65536)); |
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} |
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|
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if (snd_pcm_delay(pcm_handle, &delay_frames) < 0) |
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delay_frames = out->size / (samplewidth * audiochannels); |
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if (delay_frames < 0) |
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delay_frames = 0; |
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|
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delay_us = delay_frames * (1000000 / rate); |
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|
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rdpsnd_queue_next(delay_us); |
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} |
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} |
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|
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static struct audio_driver alsa_driver = { |
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.name = "alsa", |
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.description = "ALSA output driver, default device: " DEFAULTDEVICE, |
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|
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.add_fds = alsa_add_fds, |
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.check_fds = alsa_check_fds, |
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|
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.wave_out_open = alsa_open, |
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.wave_out_close = alsa_close, |
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.wave_out_format_supported = alsa_format_supported, |
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.wave_out_set_format = alsa_set_format, |
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.wave_out_volume = rdpsnd_dsp_softvol_set, |
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|
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.need_byteswap_on_be = 0, |
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.need_resampling = 0, |
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}; |
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|
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struct audio_driver * |
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alsa_register(char *options) |
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{ |
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if (options) |
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{ |
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pcm_name = xstrdup(options); |
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} |
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else |
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{ |
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pcm_name = xstrdup(DEFAULTDEVICE); |
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} |
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|
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return &alsa_driver; |
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} |
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