/[rdesktop]/jpeg/rdesktop/trunk/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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sourceforge.net/trunk/rdesktop/rdpsnd_libao.c revision 1260 by stargo, Sun Sep 17 15:25:10 2006 UTC jpeg/rdesktop/trunk/rdpsnd_libao.c revision 1507 by dpavlin, Mon Jul 20 16:45:11 2009 UTC
# Line 1  Line 1 
1  /* -*- c-basic-offset: 8 -*-  /* -*- 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 2003-2008
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 2005-2006     Copyright (C) Michael Gernoth mike@zerfleddert.de 2005-2008
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 29  Line 29 
29  #include <ao/ao.h>  #include <ao/ao.h>
30  #include <sys/time.h>  #include <sys/time.h>
31    
32  #define WAVEOUTBUF      16  #define WAVEOUTLEN      16
33    
34  static ao_device *o_device = NULL;  static ao_device *o_device = NULL;
35  static int default_driver;  static int default_driver;
36  static int samplerate;  static RD_BOOL reopened;
 static int audiochannels;  
 static BOOL reopened;  
 static short samplewidth;  
37  static char *libao_device = NULL;  static char *libao_device = NULL;
38    
39  BOOL  void libao_play(void);
40    
41    void
42    libao_add_fds(int *n, fd_set * rfds, fd_set * wfds, struct timeval *tv)
43    {
44            /* We need to be called rather often... */
45            if (o_device != NULL && !rdpsnd_queue_empty())
46                    FD_SET(0, wfds);
47    }
48    
49    void
50    libao_check_fds(fd_set * rfds, fd_set * wfds)
51    {
52            if (o_device == NULL)
53                    return;
54    
55            if (!rdpsnd_queue_empty())
56                    libao_play();
57    }
58    
59    RD_BOOL
60  libao_open(void)  libao_open(void)
61  {  {
62          ao_sample_format format;          ao_sample_format format;
         static int warned = 0;  
63    
64          if (!warned && libao_device)          ao_initialize();
65    
66            if (libao_device)
67          {          {
68                  warning("device-options not supported for libao-driver\n");                  default_driver = ao_driver_id(libao_device);
69                  warned = 1;          }
70            else
71            {
72                    default_driver = ao_default_driver_id();
73          }          }
   
         ao_initialize();  
         default_driver = ao_default_driver_id();  
74    
75          format.bits = 16;          format.bits = 16;
76          format.channels = 2;          format.channels = 2;
         audiochannels = 2;  
77          format.rate = 44100;          format.rate = 44100;
78          samplerate = 44100;          format.byte_format = AO_FMT_NATIVE;
79          format.byte_format = AO_FMT_LITTLE;  
80    
81          o_device = ao_open_live(default_driver, &format, NULL);          o_device = ao_open_live(default_driver, &format, NULL);
82          if (o_device == NULL)          if (o_device == NULL)
# Line 67  libao_open(void) Line 84  libao_open(void)
84                  return False;                  return False;
85          }          }
86    
         g_dsp_fd = 0;  
         rdpsnd_queue_init();  
   
87          reopened = True;          reopened = True;
88    
89          return True;          return True;
# Line 81  libao_close(void) Line 95  libao_close(void)
95          /* Ack all remaining packets */          /* Ack all remaining packets */
96          while (!rdpsnd_queue_empty())          while (!rdpsnd_queue_empty())
97          {          {
98                  rdpsnd_send_completion(rdpsnd_queue_current_packet()->tick,                  rdpsnd_queue_next(0);
                                        rdpsnd_queue_current_packet()->index);  
                 rdpsnd_queue_next();  
99          }          }
100    
101          if (o_device != NULL)          if (o_device != NULL)
102                  ao_close(o_device);                  ao_close(o_device);
103    
104          ao_shutdown();          o_device = NULL;
 }  
   
 BOOL  
 libao_format_supported(WAVEFORMATEX * pwfx)  
 {  
         if (pwfx->wFormatTag != WAVE_FORMAT_PCM)  
                 return False;  
         if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))  
                 return False;  
         if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))  
                 return False;  
         /* The only common denominator between libao output drivers is a sample-rate of  
            44100, we need to upsample 22050 to it */  
         if ((pwfx->nSamplesPerSec != 44100) && (pwfx->nSamplesPerSec != 22050))  
                 return False;  
105    
106          return True;          ao_shutdown();
107  }  }
108    
109  BOOL  RD_BOOL
110  libao_set_format(WAVEFORMATEX * pwfx)  libao_set_format(RD_WAVEFORMATEX * pwfx)
111  {  {
112          ao_sample_format format;          ao_sample_format format;
113    
114          format.bits = pwfx->wBitsPerSample;          format.bits = pwfx->wBitsPerSample;
115          format.channels = pwfx->nChannels;          format.channels = pwfx->nChannels;
         audiochannels = pwfx->nChannels;  
116          format.rate = 44100;          format.rate = 44100;
117          samplerate = pwfx->nSamplesPerSec;          format.byte_format = AO_FMT_NATIVE;
         format.byte_format = AO_FMT_LITTLE;  
   
         samplewidth = pwfx->wBitsPerSample / 8;  
118    
119          if (o_device != NULL)          if (o_device != NULL)
120                  ao_close(o_device);                  ao_close(o_device);
# Line 132  libao_set_format(WAVEFORMATEX * pwfx) Line 125  libao_set_format(WAVEFORMATEX * pwfx)
125                  return False;                  return False;
126          }          }
127    
128            if (rdpsnd_dsp_resample_set(44100, pwfx->wBitsPerSample, pwfx->nChannels) == False)
129            {
130                    return False;
131            }
132    
133          reopened = True;          reopened = True;
134    
135          return True;          return True;
# Line 142  libao_play(void) Line 140  libao_play(void)
140  {  {
141          struct audio_packet *packet;          struct audio_packet *packet;
142          STREAM out;          STREAM out;
143          char outbuf[WAVEOUTBUF];          int len;
         int offset, len, i;  
144          static long prev_s, prev_us;          static long prev_s, prev_us;
145          unsigned int duration;          unsigned int duration;
146          struct timeval tv;          struct timeval tv;
# Line 157  libao_play(void) Line 154  libao_play(void)
154                  prev_us = tv.tv_usec;                  prev_us = tv.tv_usec;
155          }          }
156    
157            /* We shouldn't be called if the queue is empty, but still */
158          if (rdpsnd_queue_empty())          if (rdpsnd_queue_empty())
         {  
                 g_dsp_busy = 0;  
159                  return;                  return;
         }  
160    
161          packet = rdpsnd_queue_current_packet();          packet = rdpsnd_queue_current_packet();
162          out = &packet->s;          out = &packet->s;
163    
164          next_tick = rdpsnd_queue_next_tick();          next_tick = rdpsnd_queue_next_tick();
165    
166          len = 0;          len = (WAVEOUTLEN > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTLEN;
167            ao_play(o_device, (char *) out->p, len);
168          if (samplerate == 22050)          out->p += len;
         {  
                 /* Resample to 44100 */  
                 for (i = 0; (i < ((WAVEOUTBUF / 4) * (3 - samplewidth))) && (out->p < out->end);  
                      i++)  
                 {  
                         /* On a stereo-channel we must make sure that left and right  
                            does not get mixed up, so we need to expand the sample-  
                            data with channels in mind: 1234 -> 12123434  
                            If we have a mono-channel, we can expand the data by simply  
                            doubling the sample-data: 1234 -> 11223344 */  
                         if (audiochannels == 2)  
                                 offset = ((i * 2) - (i & 1)) * samplewidth;  
                         else  
                                 offset = (i * 2) * samplewidth;  
   
                         memcpy(&outbuf[offset], out->p, samplewidth);  
                         memcpy(&outbuf[audiochannels * samplewidth + offset], out->p, samplewidth);  
   
                         out->p += samplewidth;  
                         len += 2 * samplewidth;  
                 }  
         }  
         else  
         {  
                 len = (WAVEOUTBUF > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTBUF;  
                 memcpy(outbuf, out->p, len);  
                 out->p += len;  
         }  
   
         ao_play(o_device, outbuf, len);  
169    
170          gettimeofday(&tv, NULL);          gettimeofday(&tv, NULL);
171    
# Line 211  libao_play(void) Line 176  libao_play(void)
176    
177          if ((out->p == out->end) || duration > next_tick - packet->tick + 500)          if ((out->p == out->end) || duration > next_tick - packet->tick + 500)
178          {          {
179                    unsigned int delay_us;
180    
181                  prev_s = tv.tv_sec;                  prev_s = tv.tv_sec;
182                  prev_us = tv.tv_usec;                  prev_us = tv.tv_usec;
183    
# Line 221  libao_play(void) Line 188  libao_play(void)
188                                 (packet->tick + duration) % 65536, next_tick % 65536));                                 (packet->tick + duration) % 65536, next_tick % 65536));
189                  }                  }
190    
191                  rdpsnd_send_completion(((packet->tick + duration) % 65536), packet->index);                  delay_us = ((out->size / 4) * (1000000 / 44100));
                 rdpsnd_queue_next();  
         }  
192    
193          g_dsp_busy = 1;                  rdpsnd_queue_next(delay_us);
194          return;          }
195  }  }
196    
197  struct audio_driver *  struct audio_driver *
# Line 234  libao_register(char *options) Line 199  libao_register(char *options)
199  {  {
200          static struct audio_driver libao_driver;          static struct audio_driver libao_driver;
201    
202          libao_driver.wave_out_write = rdpsnd_queue_write;          memset(&libao_driver, 0, sizeof(libao_driver));
203    
204            libao_driver.name = "libao";
205            libao_driver.description = "libao output driver, default device: system dependent";
206    
207            libao_driver.add_fds = libao_add_fds;
208            libao_driver.check_fds = libao_check_fds;
209    
210          libao_driver.wave_out_open = libao_open;          libao_driver.wave_out_open = libao_open;
211          libao_driver.wave_out_close = libao_close;          libao_driver.wave_out_close = libao_close;
212          libao_driver.wave_out_format_supported = libao_format_supported;          libao_driver.wave_out_format_supported = rdpsnd_dsp_resample_supported;
213          libao_driver.wave_out_set_format = libao_set_format;          libao_driver.wave_out_set_format = libao_set_format;
214          libao_driver.wave_out_volume = rdpsnd_dsp_softvol_set;          libao_driver.wave_out_volume = rdpsnd_dsp_softvol_set;
215          libao_driver.wave_out_play = libao_play;  
216          libao_driver.name = xstrdup("libao");          libao_driver.need_byteswap_on_be = 1;
217          libao_driver.description = xstrdup("libao output driver");          libao_driver.need_resampling = 1;
         libao_driver.need_byteswap_on_be = 0;  
         libao_driver.next = NULL;  
218    
219          if (options)          if (options)
220          {          {
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