| 1 |
/* -*- c-basic-offset: 8 -*- |
| 2 |
rdesktop: A Remote Desktop Protocol client. |
| 3 |
Sound Channel Process Functions - alsa-driver |
| 4 |
Copyright (C) Matthew Chapman 2003-2008 |
| 5 |
Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003 |
| 6 |
Copyright (C) Michael Gernoth mike@zerfleddert.de 2006-2008 |
| 7 |
Copyright 2006-2008 Pierre Ossman <ossman@cendio.se> for Cendio AB |
| 8 |
|
| 9 |
This program is free software; you can redistribute it and/or modify |
| 10 |
it under the terms of the GNU General Public License as published by |
| 11 |
the Free Software Foundation; either version 2 of the License, or |
| 12 |
(at your option) any later version. |
| 13 |
|
| 14 |
This program is distributed in the hope that it will be useful, |
| 15 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 |
GNU General Public License for more details. |
| 18 |
|
| 19 |
You should have received a copy of the GNU General Public License |
| 20 |
along with this program; if not, write to the Free Software |
| 21 |
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 22 |
*/ |
| 23 |
|
| 24 |
#include "rdesktop.h" |
| 25 |
#include "rdpsnd.h" |
| 26 |
#include "rdpsnd_dsp.h" |
| 27 |
#include <unistd.h> |
| 28 |
#include <fcntl.h> |
| 29 |
#include <errno.h> |
| 30 |
#include <alsa/asoundlib.h> |
| 31 |
#include <sys/time.h> |
| 32 |
|
| 33 |
#define DEFAULTDEVICE "default" |
| 34 |
#define MAX_FRAMES 32 |
| 35 |
|
| 36 |
static struct pollfd pfds_out[32]; |
| 37 |
static int num_fds_out; |
| 38 |
|
| 39 |
static struct pollfd pfds_in[32]; |
| 40 |
static int num_fds_in; |
| 41 |
|
| 42 |
static snd_pcm_t *out_handle = NULL; |
| 43 |
static snd_pcm_t *in_handle = NULL; |
| 44 |
|
| 45 |
static RD_BOOL reopened; |
| 46 |
|
| 47 |
static short samplewidth_out; |
| 48 |
static int audiochannels_out; |
| 49 |
static unsigned int rate_out; |
| 50 |
|
| 51 |
static short samplewidth_in; |
| 52 |
static int audiochannels_in; |
| 53 |
static unsigned int rate_in; |
| 54 |
|
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static char *pcm_name; |
| 56 |
|
| 57 |
void alsa_play(void); |
| 58 |
void alsa_record(void); |
| 59 |
|
| 60 |
void |
| 61 |
alsa_add_fds(int *n, fd_set * rfds, fd_set * wfds, struct timeval *tv) |
| 62 |
{ |
| 63 |
int err; |
| 64 |
struct pollfd *f; |
| 65 |
|
| 66 |
if (out_handle && !rdpsnd_queue_empty()) |
| 67 |
{ |
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num_fds_out = snd_pcm_poll_descriptors_count(out_handle); |
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|
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if (num_fds_out > sizeof(pfds_out) / sizeof(*pfds_out)) |
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return; |
| 72 |
|
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err = snd_pcm_poll_descriptors(out_handle, pfds_out, num_fds_out); |
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if (err < 0) |
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return; |
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|
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for (f = pfds_out; f < &pfds_out[num_fds_out]; 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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if (in_handle) |
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{ |
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num_fds_in = snd_pcm_poll_descriptors_count(in_handle); |
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|
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if (num_fds_in > sizeof(pfds_in) / sizeof(*pfds_in)) |
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return; |
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|
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err = snd_pcm_poll_descriptors(in_handle, pfds_in, num_fds_in); |
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if (err < 0) |
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return; |
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|
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for (f = pfds_in; f < &pfds_in[num_fds_in]; 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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} |
| 108 |
} |
| 109 |
} |
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|
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void |
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alsa_check_fds(fd_set * rfds, fd_set * wfds) |
| 113 |
{ |
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struct pollfd *f; |
| 115 |
int err; |
| 116 |
unsigned short revents; |
| 117 |
|
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if (out_handle && !rdpsnd_queue_empty()) |
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{ |
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for (f = pfds_out; f < &pfds_out[num_fds_out]; 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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} |
| 132 |
|
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err = snd_pcm_poll_descriptors_revents(out_handle, pfds_out, num_fds_out, &revents); |
| 134 |
if (err < 0) |
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return; |
| 136 |
|
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if (revents & POLLOUT) |
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alsa_play(); |
| 139 |
} |
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|
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|
| 142 |
if (in_handle) |
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{ |
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for (f = pfds_in; f < &pfds_in[num_fds_in]; f++) |
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{ |
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f->revents = 0; |
| 147 |
if (f->fd != -1) |
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{ |
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/* Fixme: This doesn't properly deal with things like POLLHUP */ |
| 150 |
if (FD_ISSET(f->fd, rfds)) |
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f->revents |= POLLIN; |
| 152 |
if (FD_ISSET(f->fd, wfds)) |
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f->revents |= POLLOUT; |
| 154 |
} |
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} |
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|
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err = snd_pcm_poll_descriptors_revents(in_handle, pfds_in, num_fds_in, &revents); |
| 158 |
if (err < 0) |
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return; |
| 160 |
|
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if (revents & POLLIN) |
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alsa_record(); |
| 163 |
} |
| 164 |
} |
| 165 |
|
| 166 |
static RD_BOOL |
| 167 |
alsa_set_format(snd_pcm_t * pcm, RD_WAVEFORMATEX * pwfx) |
| 168 |
{ |
| 169 |
snd_pcm_hw_params_t *hwparams = NULL; |
| 170 |
int err; |
| 171 |
unsigned int buffertime; |
| 172 |
short samplewidth; |
| 173 |
int audiochannels; |
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unsigned int rate; |
| 175 |
|
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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; |
| 182 |
} |
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|
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if ((err = snd_pcm_hw_params_any(pcm, 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; |
| 188 |
} |
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|
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if ((err = snd_pcm_hw_params_set_access(pcm, 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; |
| 194 |
} |
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|
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if (pwfx->wBitsPerSample == 16) |
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{ |
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if ((err = snd_pcm_hw_params_set_format(pcm, 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; |
| 202 |
} |
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} |
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else |
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{ |
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if ((err = snd_pcm_hw_params_set_format(pcm, 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; |
| 210 |
} |
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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, 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, 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; |
| 226 |
} |
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|
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audiochannels = pwfx->nChannels; |
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if ((err = snd_pcm_hw_params_set_channels(pcm, 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; |
| 233 |
} |
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|
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|
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buffertime = 500000; /* microseconds */ |
| 237 |
if ((err = snd_pcm_hw_params_set_buffer_time_near(pcm, 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)); |
| 240 |
return False; |
| 241 |
} |
| 242 |
|
| 243 |
if ((err = snd_pcm_hw_params(pcm, hwparams)) < 0) |
| 244 |
{ |
| 245 |
error("snd_pcm_hw_params: %s\n", snd_strerror(err)); |
| 246 |
return False; |
| 247 |
} |
| 248 |
|
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snd_pcm_hw_params_free(hwparams); |
| 250 |
|
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if ((err = snd_pcm_prepare(pcm)) < 0) |
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{ |
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error("snd_pcm_prepare: %s\n", snd_strerror(err)); |
| 254 |
return False; |
| 255 |
} |
| 256 |
|
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reopened = True; |
| 258 |
|
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return True; |
| 260 |
} |
| 261 |
|
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RD_BOOL |
| 263 |
alsa_open_out(void) |
| 264 |
{ |
| 265 |
int err; |
| 266 |
|
| 267 |
if ((err = snd_pcm_open(&out_handle, pcm_name, SND_PCM_STREAM_PLAYBACK, 0)) < 0) |
| 268 |
{ |
| 269 |
error("snd_pcm_open: %s\n", snd_strerror(err)); |
| 270 |
return False; |
| 271 |
} |
| 272 |
|
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reopened = True; |
| 274 |
|
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return True; |
| 276 |
} |
| 277 |
|
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void |
| 279 |
alsa_close_out(void) |
| 280 |
{ |
| 281 |
/* Ack all remaining packets */ |
| 282 |
while (!rdpsnd_queue_empty()) |
| 283 |
rdpsnd_queue_next(0); |
| 284 |
|
| 285 |
if (out_handle) |
| 286 |
{ |
| 287 |
snd_pcm_close(out_handle); |
| 288 |
out_handle = NULL; |
| 289 |
} |
| 290 |
} |
| 291 |
|
| 292 |
RD_BOOL |
| 293 |
alsa_format_supported(RD_WAVEFORMATEX * pwfx) |
| 294 |
{ |
| 295 |
#if 0 |
| 296 |
int err; |
| 297 |
snd_pcm_hw_params_t *hwparams = NULL; |
| 298 |
|
| 299 |
if ((err = snd_pcm_hw_params_malloc(&hwparams)) < 0) |
| 300 |
{ |
| 301 |
error("snd_pcm_hw_params_malloc: %s\n", snd_strerror(err)); |
| 302 |
return False; |
| 303 |
} |
| 304 |
|
| 305 |
if ((err = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0) |
| 306 |
{ |
| 307 |
error("snd_pcm_hw_params_malloc: %s\n", snd_strerror(err)); |
| 308 |
return False; |
| 309 |
} |
| 310 |
snd_pcm_hw_params_free(hwparams); |
| 311 |
#endif |
| 312 |
|
| 313 |
if (pwfx->wFormatTag != WAVE_FORMAT_PCM) |
| 314 |
return False; |
| 315 |
if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2)) |
| 316 |
return False; |
| 317 |
if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16)) |
| 318 |
return False; |
| 319 |
if ((pwfx->nSamplesPerSec != 44100) && (pwfx->nSamplesPerSec != 22050)) |
| 320 |
return False; |
| 321 |
|
| 322 |
return True; |
| 323 |
} |
| 324 |
|
| 325 |
RD_BOOL |
| 326 |
alsa_set_format_out(RD_WAVEFORMATEX * pwfx) |
| 327 |
{ |
| 328 |
if (!alsa_set_format(out_handle, pwfx)) |
| 329 |
return False; |
| 330 |
|
| 331 |
samplewidth_out = pwfx->wBitsPerSample / 8; |
| 332 |
audiochannels_out = pwfx->nChannels; |
| 333 |
rate_out = pwfx->nSamplesPerSec; |
| 334 |
|
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return True; |
| 336 |
} |
| 337 |
|
| 338 |
void |
| 339 |
alsa_play(void) |
| 340 |
{ |
| 341 |
struct audio_packet *packet; |
| 342 |
STREAM out; |
| 343 |
int len; |
| 344 |
static long prev_s, prev_us; |
| 345 |
unsigned int duration; |
| 346 |
struct timeval tv; |
| 347 |
int next_tick; |
| 348 |
|
| 349 |
if (reopened) |
| 350 |
{ |
| 351 |
reopened = False; |
| 352 |
gettimeofday(&tv, NULL); |
| 353 |
prev_s = tv.tv_sec; |
| 354 |
prev_us = tv.tv_usec; |
| 355 |
} |
| 356 |
|
| 357 |
/* We shouldn't be called if the queue is empty, but still */ |
| 358 |
if (rdpsnd_queue_empty()) |
| 359 |
return; |
| 360 |
|
| 361 |
packet = rdpsnd_queue_current_packet(); |
| 362 |
out = &packet->s; |
| 363 |
|
| 364 |
next_tick = rdpsnd_queue_next_tick(); |
| 365 |
|
| 366 |
len = (out->end - out->p) / (samplewidth_out * audiochannels_out); |
| 367 |
if ((len = snd_pcm_writei(out_handle, out->p, ((MAX_FRAMES < len) ? MAX_FRAMES : len))) < 0) |
| 368 |
{ |
| 369 |
printf("Fooo!\n"); |
| 370 |
snd_pcm_prepare(out_handle); |
| 371 |
len = 0; |
| 372 |
} |
| 373 |
out->p += (len * samplewidth_out * audiochannels_out); |
| 374 |
|
| 375 |
gettimeofday(&tv, NULL); |
| 376 |
|
| 377 |
duration = ((tv.tv_sec - prev_s) * 1000000 + (tv.tv_usec - prev_us)) / 1000; |
| 378 |
|
| 379 |
if (packet->tick > next_tick) |
| 380 |
next_tick += 65536; |
| 381 |
|
| 382 |
if ((out->p == out->end) || duration > next_tick - packet->tick + 500) |
| 383 |
{ |
| 384 |
snd_pcm_sframes_t delay_frames; |
| 385 |
unsigned long delay_us; |
| 386 |
|
| 387 |
prev_s = tv.tv_sec; |
| 388 |
prev_us = tv.tv_usec; |
| 389 |
|
| 390 |
if (abs((next_tick - packet->tick) - duration) > 20) |
| 391 |
{ |
| 392 |
DEBUG(("duration: %d, calc: %d, ", duration, next_tick - packet->tick)); |
| 393 |
DEBUG(("last: %d, is: %d, should: %d\n", packet->tick, |
| 394 |
(packet->tick + duration) % 65536, next_tick % 65536)); |
| 395 |
} |
| 396 |
|
| 397 |
if (snd_pcm_delay(out_handle, &delay_frames) < 0) |
| 398 |
delay_frames = out->size / (samplewidth_out * audiochannels_out); |
| 399 |
if (delay_frames < 0) |
| 400 |
delay_frames = 0; |
| 401 |
|
| 402 |
delay_us = delay_frames * (1000000 / rate_out); |
| 403 |
|
| 404 |
rdpsnd_queue_next(delay_us); |
| 405 |
} |
| 406 |
} |
| 407 |
|
| 408 |
RD_BOOL |
| 409 |
alsa_open_in(void) |
| 410 |
{ |
| 411 |
int err; |
| 412 |
|
| 413 |
if ((err = |
| 414 |
snd_pcm_open(&in_handle, pcm_name, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK)) < 0) |
| 415 |
{ |
| 416 |
error("snd_pcm_open: %s\n", snd_strerror(err)); |
| 417 |
return False; |
| 418 |
} |
| 419 |
|
| 420 |
return True; |
| 421 |
} |
| 422 |
|
| 423 |
void |
| 424 |
alsa_close_in(void) |
| 425 |
{ |
| 426 |
if (in_handle) |
| 427 |
{ |
| 428 |
snd_pcm_close(in_handle); |
| 429 |
in_handle = NULL; |
| 430 |
} |
| 431 |
} |
| 432 |
|
| 433 |
RD_BOOL |
| 434 |
alsa_set_format_in(RD_WAVEFORMATEX * pwfx) |
| 435 |
{ |
| 436 |
int err; |
| 437 |
|
| 438 |
if (!alsa_set_format(in_handle, pwfx)) |
| 439 |
return False; |
| 440 |
|
| 441 |
if ((err = snd_pcm_start(in_handle)) < 0) |
| 442 |
{ |
| 443 |
error("snd_pcm_start: %s\n", snd_strerror(err)); |
| 444 |
return False; |
| 445 |
} |
| 446 |
|
| 447 |
samplewidth_in = pwfx->wBitsPerSample / 8; |
| 448 |
audiochannels_in = pwfx->nChannels; |
| 449 |
rate_in = pwfx->nSamplesPerSec; |
| 450 |
|
| 451 |
return True; |
| 452 |
} |
| 453 |
|
| 454 |
void |
| 455 |
alsa_record(void) |
| 456 |
{ |
| 457 |
int len; |
| 458 |
char buffer[32768]; |
| 459 |
|
| 460 |
len = snd_pcm_readi(in_handle, buffer, |
| 461 |
sizeof(buffer) / (samplewidth_in * audiochannels_in)); |
| 462 |
if (len < 0) |
| 463 |
{ |
| 464 |
snd_pcm_prepare(in_handle); |
| 465 |
len = 0; |
| 466 |
} |
| 467 |
|
| 468 |
rdpsnd_record(buffer, len * samplewidth_in * audiochannels_in); |
| 469 |
} |
| 470 |
|
| 471 |
struct audio_driver * |
| 472 |
alsa_register(char *options) |
| 473 |
{ |
| 474 |
static struct audio_driver alsa_driver; |
| 475 |
|
| 476 |
memset(&alsa_driver, 0, sizeof(alsa_driver)); |
| 477 |
|
| 478 |
alsa_driver.name = "alsa"; |
| 479 |
alsa_driver.description = "ALSA output driver, default device: " DEFAULTDEVICE; |
| 480 |
|
| 481 |
alsa_driver.add_fds = alsa_add_fds; |
| 482 |
alsa_driver.check_fds = alsa_check_fds; |
| 483 |
|
| 484 |
alsa_driver.wave_out_open = alsa_open_out; |
| 485 |
alsa_driver.wave_out_close = alsa_close_out; |
| 486 |
alsa_driver.wave_out_format_supported = alsa_format_supported; |
| 487 |
alsa_driver.wave_out_set_format = alsa_set_format_out; |
| 488 |
alsa_driver.wave_out_volume = rdpsnd_dsp_softvol_set; |
| 489 |
|
| 490 |
alsa_driver.wave_in_open = alsa_open_in; |
| 491 |
alsa_driver.wave_in_close = alsa_close_in; |
| 492 |
alsa_driver.wave_in_format_supported = alsa_format_supported; |
| 493 |
alsa_driver.wave_in_set_format = alsa_set_format_in; |
| 494 |
alsa_driver.wave_in_volume = NULL; /* FIXME */ |
| 495 |
|
| 496 |
alsa_driver.need_byteswap_on_be = 0; |
| 497 |
alsa_driver.need_resampling = 0; |
| 498 |
|
| 499 |
if (options) |
| 500 |
{ |
| 501 |
pcm_name = xstrdup(options); |
| 502 |
} |
| 503 |
else |
| 504 |
{ |
| 505 |
pcm_name = DEFAULTDEVICE; |
| 506 |
} |
| 507 |
|
| 508 |
return &alsa_driver; |
| 509 |
} |
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