/[rdesktop]/sourceforge.net/trunk/rdesktop/rdpsnd_libao.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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revision 838 by stargo, Tue Mar 8 12:29:19 2005 UTC revision 1256 by stargo, Sun Sep 17 11:42:22 2006 UTC
# Line 1  Line 1 
1  /*  /* -*- c-basic-offset: 8 -*-
2     rdesktop: A Remote Desktop Protocol client.     rdesktop: A Remote Desktop Protocol client.
3     Sound Channel Process Functions - libao-driver     Sound Channel Process Functions - libao-driver
4     Copyright (C) Matthew Chapman 2003     Copyright (C) Matthew Chapman 2003
5     Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003     Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
6     Copyright (C) Michael Gernoth mike@zerfleddert.de 2005     Copyright (C) Michael Gernoth mike@zerfleddert.de 2005-2006
7    
8     This program is free software; you can redistribute it and/or modify     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     it under the terms of the GNU General Public License as published by
# Line 21  Line 21 
21  */  */
22    
23  #include "rdesktop.h"  #include "rdesktop.h"
24    #include "rdpsnd.h"
25  #include <unistd.h>  #include <unistd.h>
26  #include <fcntl.h>  #include <fcntl.h>
27  #include <errno.h>  #include <errno.h>
28  #include <ao/ao.h>  #include <ao/ao.h>
29    #include <sys/time.h>
30    
31  #define MAX_QUEUE       10  #define WAVEOUTBUF      16
 #define WAVEOUTBUF      32  
32    
33  int g_dsp_fd;  static ao_device *o_device = NULL;
34  ao_device *o_device = NULL;  static int default_driver;
35  int default_driver;  static int samplerate;
36  int g_samplerate;  static int audiochannels;
37  BOOL g_dsp_busy = False;  static BOOL reopened;
38  static short g_samplewidth;  static short samplewidth;
39    static char *libao_device = NULL;
 static struct audio_packet  
 {  
         struct stream s;  
         uint16 tick;  
         uint8 index;  
 } packet_queue[MAX_QUEUE];  
 static unsigned int queue_hi, queue_lo;  
40    
41  BOOL  BOOL
42  wave_out_open(void)  libao_open(void)
43  {  {
44          ao_sample_format format;          ao_sample_format format;
45            static int warned = 0;
46    
47            if (!warned && libao_device)
48            {
49                    warning("device-options not supported for libao-driver\n");
50                    warned = 1;
51            }
52    
53          ao_initialize();          ao_initialize();
54          default_driver = ao_default_driver_id();          default_driver = ao_default_driver_id();
55    
56          format.bits = 16;          format.bits = 16;
57          format.channels = 2;          format.channels = 2;
58            audiochannels = 2;
59          format.rate = 44100;          format.rate = 44100;
60          g_samplerate = 44100;          samplerate = 44100;
61          format.byte_format = AO_FMT_LITTLE;          format.byte_format = AO_FMT_LITTLE;
62    
63          o_device = ao_open_live(default_driver, &format, NULL);          o_device = ao_open_live(default_driver, &format, NULL);
# Line 65  wave_out_open(void) Line 67  wave_out_open(void)
67          }          }
68    
69          g_dsp_fd = 0;          g_dsp_fd = 0;
70          queue_lo = queue_hi = 0;          rdpsnd_queue_init();
71    
72            reopened = True;
73    
74          return True;          return True;
75  }  }
76    
77  void  void
78  wave_out_close(void)  libao_close(void)
79  {  {
80          /* Ack all remaining packets */          /* Ack all remaining packets */
81          while (queue_lo != queue_hi)          while (!rdpsnd_queue_empty())
82          {          {
83                  rdpsnd_send_completion(packet_queue[queue_lo].tick, packet_queue[queue_lo].index);                  rdpsnd_send_completion(rdpsnd_queue_current_packet()->tick,
84                  free(packet_queue[queue_lo].s.data);                                         rdpsnd_queue_current_packet()->index);
85                  queue_lo = (queue_lo + 1) % MAX_QUEUE;                  rdpsnd_queue_next();
86          }          }
87    
88          if (o_device != NULL)          if (o_device != NULL)
# Line 88  wave_out_close(void) Line 92  wave_out_close(void)
92  }  }
93    
94  BOOL  BOOL
95  wave_out_format_supported(WAVEFORMATEX * pwfx)  libao_format_supported(WAVEFORMATEX * pwfx)
96  {  {
97          if (pwfx->wFormatTag != WAVE_FORMAT_PCM)          if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
98                  return False;                  return False;
# Line 105  wave_out_format_supported(WAVEFORMATEX * Line 109  wave_out_format_supported(WAVEFORMATEX *
109  }  }
110    
111  BOOL  BOOL
112  wave_out_set_format(WAVEFORMATEX * pwfx)  libao_set_format(WAVEFORMATEX * pwfx)
113  {  {
114          ao_sample_format format;          ao_sample_format format;
115    
116          format.bits = pwfx->wBitsPerSample;          format.bits = pwfx->wBitsPerSample;
117          format.channels = pwfx->nChannels;          format.channels = pwfx->nChannels;
118            audiochannels = pwfx->nChannels;
119          format.rate = 44100;          format.rate = 44100;
120          g_samplerate = pwfx->nSamplesPerSec;          samplerate = pwfx->nSamplesPerSec;
121          format.byte_format = AO_FMT_LITTLE;          format.byte_format = AO_FMT_LITTLE;
122    
123          g_samplewidth = pwfx->wBitsPerSample / 8;          samplewidth = pwfx->wBitsPerSample / 8;
124    
125          if (o_device != NULL)          if (o_device != NULL)
126                  ao_close(o_device);                  ao_close(o_device);
# Line 126  wave_out_set_format(WAVEFORMATEX * pwfx) Line 131  wave_out_set_format(WAVEFORMATEX * pwfx)
131                  return False;                  return False;
132          }          }
133    
134            reopened = True;
135    
136          return True;          return True;
137  }  }
138    
139  void  void
140  wave_out_volume(uint16 left, uint16 right)  libao_volume(uint16 left, uint16 right)
141  {  {
142          warning("volume changes not supported with libao-output\n");          warning("volume changes not supported with libao-output\n");
143  }  }
144    
145  void  void
146  wave_out_write(STREAM s, uint16 tick, uint8 index)  libao_play(void)
 {  
         struct audio_packet *packet = &packet_queue[queue_hi];  
         unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;  
   
         if (next_hi == queue_lo)  
         {  
                 error("No space to queue audio packet\n");  
                 return;  
         }  
   
         queue_hi = next_hi;  
   
         packet->s = *s;  
         packet->tick = tick;  
         packet->index = index;  
         packet->s.p += 4;  
   
         /* we steal the data buffer from s, give it a new one */  
         s->data = malloc(s->size);  
   
         if (!g_dsp_busy)  
                 wave_out_play();  
 }  
   
 void  
 wave_out_play(void)  
147  {  {
148          struct audio_packet *packet;          struct audio_packet *packet;
149          STREAM out;          STREAM out;
150          unsigned char outbuf[WAVEOUTBUF];          char outbuf[WAVEOUTBUF];
151          int offset, len, i;          int offset, len, i;
152            static long prev_s, prev_us;
153            unsigned int duration;
154            struct timeval tv;
155            int next_tick;
156    
157            if (reopened)
158            {
159                    reopened = False;
160                    gettimeofday(&tv, NULL);
161                    prev_s = tv.tv_sec;
162                    prev_us = tv.tv_usec;
163            }
164    
165          if (queue_lo == queue_hi)          if (rdpsnd_queue_empty())
166          {          {
167                  g_dsp_busy = 0;                  g_dsp_busy = 0;
168                  return;                  return;
169          }          }
170    
171          packet = &packet_queue[queue_lo];          packet = rdpsnd_queue_current_packet();
172          out = &packet->s;          out = &packet->s;
173    
174            next_tick = rdpsnd_queue_next_tick();
175    
176          len = 0;          len = 0;
177    
178          if (g_samplerate == 22050)          if (samplerate == 22050)
179          {          {
180                  /* Resample to 44100 */                  /* Resample to 44100 */
181                  for (i = 0; (i < ((WAVEOUTBUF / 8) * (3 - g_samplewidth))) && (out->p < out->end);                  for (i = 0; (i < ((WAVEOUTBUF / 4) * (3 - samplewidth))) && (out->p < out->end);
182                       i++)                       i++)
183                  {                  {
184                          offset = i * 4 * g_samplewidth;                          /* On a stereo-channel we must make sure that left and right
185                          memcpy(&outbuf[0 * g_samplewidth + offset], out->p, g_samplewidth);                             does not get mixed up, so we need to expand the sample-
186                          memcpy(&outbuf[2 * g_samplewidth + offset], out->p, g_samplewidth);                             data with channels in mind: 1234 -> 12123434
187                          out->p += 2;                             If we have a mono-channel, we can expand the data by simply
188                               doubling the sample-data: 1234 -> 11223344 */
189                          memcpy(&outbuf[1 * g_samplewidth + offset], out->p, g_samplewidth);                          if (audiochannels == 2)
190                          memcpy(&outbuf[3 * g_samplewidth + offset], out->p, g_samplewidth);                                  offset = ((i * 2) - (i & 1)) * samplewidth;
191                          out->p += 2;                          else
192                          len += 4 * g_samplewidth;                                  offset = (i * 2) * samplewidth;
193    
194                            memcpy(&outbuf[offset], out->p, samplewidth);
195                            memcpy(&outbuf[audiochannels * samplewidth + offset], out->p, samplewidth);
196    
197                            out->p += samplewidth;
198                            len += 2 * samplewidth;
199                  }                  }
200          }          }
201          else          else
# Line 207  wave_out_play(void) Line 207  wave_out_play(void)
207    
208          ao_play(o_device, outbuf, len);          ao_play(o_device, outbuf, len);
209    
210          if (out->p == out->end)          gettimeofday(&tv, NULL);
211    
212            duration = ((tv.tv_sec - prev_s) * 1000000 + (tv.tv_usec - prev_us)) / 1000;
213    
214            if (packet->tick > next_tick)
215                    next_tick += 65536;
216    
217            if ((out->p == out->end) || duration > next_tick - packet->tick + 500)
218          {          {
219                  rdpsnd_send_completion(packet->tick, packet->index);                  prev_s = tv.tv_sec;
220                  free(out->data);                  prev_us = tv.tv_usec;
221                  queue_lo = (queue_lo + 1) % MAX_QUEUE;  
222                    if (abs((next_tick - packet->tick) - duration) > 20)
223                    {
224                            DEBUG(("duration: %d, calc: %d, ", duration, next_tick - packet->tick));
225                            DEBUG(("last: %d, is: %d, should: %d\n", packet->tick,
226                                   (packet->tick + duration) % 65536, next_tick % 65536));
227                    }
228    
229                    rdpsnd_send_completion(((packet->tick + duration) % 65536), packet->index);
230                    rdpsnd_queue_next();
231          }          }
232    
233          g_dsp_busy = 1;          g_dsp_busy = 1;
234          return;          return;
235  }  }
236    
237    struct audio_driver *
238    libao_register(char *options)
239    {
240            static struct audio_driver libao_driver;
241    
242            libao_driver.wave_out_write = rdpsnd_queue_write;
243            libao_driver.wave_out_open = libao_open;
244            libao_driver.wave_out_close = libao_close;
245            libao_driver.wave_out_format_supported = libao_format_supported;
246            libao_driver.wave_out_set_format = libao_set_format;
247            libao_driver.wave_out_volume = libao_volume;
248            libao_driver.wave_out_play = libao_play;
249            libao_driver.name = xstrdup("libao");
250            libao_driver.description = xstrdup("libao output driver");
251            libao_driver.next = NULL;
252    
253            if (options)
254            {
255                    libao_device = xstrdup(options);
256            }
257    
258            return &libao_driver;
259    }
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