| 1 |
/* |
| 2 |
rdesktop: A Remote Desktop Protocol client. |
| 3 |
Sound Channel Process Functions - libao-driver |
| 4 |
Copyright (C) Matthew Chapman 2003 |
| 5 |
Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003 |
| 6 |
Copyright (C) Michael Gernoth mike@zerfleddert.de 2005 |
| 7 |
|
| 8 |
This program is free software; you can redistribute it and/or modify |
| 9 |
it under the terms of the GNU General Public License as published by |
| 10 |
the Free Software Foundation; either version 2 of the License, or |
| 11 |
(at your option) any later version. |
| 12 |
|
| 13 |
This program is distributed in the hope that it will be useful, |
| 14 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 |
GNU General Public License for more details. |
| 17 |
|
| 18 |
You should have received a copy of the GNU General Public License |
| 19 |
along with this program; if not, write to the Free Software |
| 20 |
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 21 |
*/ |
| 22 |
|
| 23 |
#include "rdesktop.h" |
| 24 |
#include <unistd.h> |
| 25 |
#include <fcntl.h> |
| 26 |
#include <errno.h> |
| 27 |
#include <ao/ao.h> |
| 28 |
|
| 29 |
#define MAX_QUEUE 10 |
| 30 |
#define WAVEOUTBUF 32 |
| 31 |
|
| 32 |
int g_dsp_fd; |
| 33 |
ao_device *o_device = NULL; |
| 34 |
int default_driver; |
| 35 |
int g_samplerate; |
| 36 |
BOOL g_dsp_busy = False; |
| 37 |
static short g_samplewidth; |
| 38 |
|
| 39 |
static struct audio_packet |
| 40 |
{ |
| 41 |
struct stream s; |
| 42 |
uint16 tick; |
| 43 |
uint8 index; |
| 44 |
} packet_queue[MAX_QUEUE]; |
| 45 |
static unsigned int queue_hi, queue_lo; |
| 46 |
|
| 47 |
BOOL |
| 48 |
wave_out_open(void) |
| 49 |
{ |
| 50 |
ao_sample_format format; |
| 51 |
|
| 52 |
ao_initialize(); |
| 53 |
default_driver = ao_default_driver_id(); |
| 54 |
|
| 55 |
format.bits = 16; |
| 56 |
format.channels = 2; |
| 57 |
format.rate = 44100; |
| 58 |
g_samplerate = 44100; |
| 59 |
format.byte_format = AO_FMT_LITTLE; |
| 60 |
|
| 61 |
o_device = ao_open_live(default_driver, &format, NULL); |
| 62 |
if (o_device == NULL) |
| 63 |
{ |
| 64 |
return False; |
| 65 |
} |
| 66 |
|
| 67 |
g_dsp_fd = 0; |
| 68 |
queue_lo = queue_hi = 0; |
| 69 |
|
| 70 |
return True; |
| 71 |
} |
| 72 |
|
| 73 |
void |
| 74 |
wave_out_close(void) |
| 75 |
{ |
| 76 |
/* Ack all remaining packets */ |
| 77 |
while (queue_lo != queue_hi) |
| 78 |
{ |
| 79 |
rdpsnd_send_completion(packet_queue[queue_lo].tick, packet_queue[queue_lo].index); |
| 80 |
free(packet_queue[queue_lo].s.data); |
| 81 |
queue_lo = (queue_lo + 1) % MAX_QUEUE; |
| 82 |
} |
| 83 |
|
| 84 |
if (o_device != NULL) |
| 85 |
ao_close(o_device); |
| 86 |
ao_shutdown(); |
| 87 |
} |
| 88 |
|
| 89 |
BOOL |
| 90 |
wave_out_format_supported(WAVEFORMATEX * pwfx) |
| 91 |
{ |
| 92 |
if (pwfx->wFormatTag != WAVE_FORMAT_PCM) |
| 93 |
return False; |
| 94 |
if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2)) |
| 95 |
return False; |
| 96 |
if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16)) |
| 97 |
return False; |
| 98 |
/* The only common denominator between libao output drivers is a sample-rate of |
| 99 |
44100, we need to upsample 22050 to it */ |
| 100 |
if ((pwfx->nSamplesPerSec != 44100) && (pwfx->nSamplesPerSec != 22050)) |
| 101 |
return False; |
| 102 |
|
| 103 |
return True; |
| 104 |
} |
| 105 |
|
| 106 |
BOOL |
| 107 |
wave_out_set_format(WAVEFORMATEX * pwfx) |
| 108 |
{ |
| 109 |
ao_sample_format format; |
| 110 |
|
| 111 |
format.bits = pwfx->wBitsPerSample; |
| 112 |
format.channels = pwfx->nChannels; |
| 113 |
format.rate = 44100; |
| 114 |
g_samplerate = pwfx->nSamplesPerSec; |
| 115 |
format.byte_format = AO_FMT_LITTLE; |
| 116 |
|
| 117 |
g_samplewidth = pwfx->wBitsPerSample / 8; |
| 118 |
|
| 119 |
if(o_device != NULL) |
| 120 |
ao_close(o_device); |
| 121 |
|
| 122 |
o_device = ao_open_live(default_driver, &format, NULL); |
| 123 |
if (o_device == NULL) |
| 124 |
{ |
| 125 |
return False; |
| 126 |
} |
| 127 |
|
| 128 |
|
| 129 |
return True; |
| 130 |
} |
| 131 |
|
| 132 |
void |
| 133 |
wave_out_volume(uint16 left, uint16 right) |
| 134 |
{ |
| 135 |
} |
| 136 |
|
| 137 |
void |
| 138 |
wave_out_write(STREAM s, uint16 tick, uint8 index) |
| 139 |
{ |
| 140 |
struct audio_packet *packet = &packet_queue[queue_hi]; |
| 141 |
unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE; |
| 142 |
|
| 143 |
if (next_hi == queue_lo) |
| 144 |
{ |
| 145 |
error("No space to queue audio packet\n"); |
| 146 |
return; |
| 147 |
} |
| 148 |
|
| 149 |
queue_hi = next_hi; |
| 150 |
|
| 151 |
packet->s = *s; |
| 152 |
packet->tick = tick; |
| 153 |
packet->index = index; |
| 154 |
packet->s.p += 4; |
| 155 |
|
| 156 |
/* we steal the data buffer from s, give it a new one */ |
| 157 |
s->data = malloc(s->size); |
| 158 |
|
| 159 |
if (!g_dsp_busy) |
| 160 |
wave_out_play(); |
| 161 |
} |
| 162 |
|
| 163 |
void |
| 164 |
wave_out_play(void) |
| 165 |
{ |
| 166 |
struct audio_packet *packet; |
| 167 |
STREAM out; |
| 168 |
unsigned char expanded[WAVEOUTBUF]; |
| 169 |
int offset,len,i; |
| 170 |
|
| 171 |
if (queue_lo == queue_hi) |
| 172 |
{ |
| 173 |
g_dsp_busy = 0; |
| 174 |
return; |
| 175 |
} |
| 176 |
|
| 177 |
packet = &packet_queue[queue_lo]; |
| 178 |
out = &packet->s; |
| 179 |
|
| 180 |
len = 0; |
| 181 |
|
| 182 |
if (g_samplerate == 22050 ) |
| 183 |
{ |
| 184 |
/* Resample to 44100 */ |
| 185 |
for(i=0; (i<((WAVEOUTBUF/8)*(3-g_samplewidth))) && (out->p < out->end); i++) |
| 186 |
{ |
| 187 |
offset=i*4*g_samplewidth; |
| 188 |
memcpy(&expanded[0*g_samplewidth+offset],out->p,g_samplewidth); |
| 189 |
memcpy(&expanded[2*g_samplewidth+offset],out->p,g_samplewidth); |
| 190 |
out->p += 2; |
| 191 |
|
| 192 |
memcpy(&expanded[1*g_samplewidth+offset],out->p,g_samplewidth); |
| 193 |
memcpy(&expanded[3*g_samplewidth+offset],out->p,g_samplewidth); |
| 194 |
out->p += 2; |
| 195 |
len += 4*g_samplewidth; |
| 196 |
} |
| 197 |
} |
| 198 |
else |
| 199 |
{ |
| 200 |
len = (WAVEOUTBUF > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTBUF; |
| 201 |
memcpy(expanded,out->p,len); |
| 202 |
out->p += len; |
| 203 |
} |
| 204 |
|
| 205 |
ao_play(o_device, expanded, len); |
| 206 |
|
| 207 |
if (out->p == out->end) |
| 208 |
{ |
| 209 |
rdpsnd_send_completion(packet->tick, packet->index); |
| 210 |
free(out->data); |
| 211 |
queue_lo = (queue_lo + 1) % MAX_QUEUE; |
| 212 |
} |
| 213 |
|
| 214 |
g_dsp_busy = 1; |
| 215 |
return; |
| 216 |
} |
Parent Directory
| 
Revision Log