/[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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revision 963 by astrand, Wed Aug 3 10:56:16 2005 UTC revision 1475 by jsorg71, Fri Jul 11 03:51:23 2008 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     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 21  Line 21 
21  */  */
22    
23  #include "rdesktop.h"  #include "rdesktop.h"
24    #include "rdpsnd.h"
25    #include "rdpsnd_dsp.h"
26  #include <unistd.h>  #include <unistd.h>
27  #include <fcntl.h>  #include <fcntl.h>
28  #include <errno.h>  #include <errno.h>
29  #include <ao/ao.h>  #include <ao/ao.h>
30  #include <sys/time.h>  #include <sys/time.h>
31    
32  #define MAX_QUEUE       10  #define WAVEOUTLEN      16
 #define WAVEOUTBUF      64  
33    
34  int g_dsp_fd;  static ao_device *o_device = NULL;
35  ao_device *o_device = NULL;  static int default_driver;
36  int default_driver;  static RD_BOOL reopened;
37  int g_samplerate;  static char *libao_device = NULL;
 int g_channels;  
 BOOL g_dsp_busy = False;  
 static BOOL g_reopened;  
 static short g_samplewidth;  
38    
39  static struct audio_packet  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          struct stream s;          if (o_device == NULL)
53          uint16 tick;                  return;
54          uint8 index;  
55  } packet_queue[MAX_QUEUE];          if (!rdpsnd_queue_empty())
56  static unsigned int queue_hi, queue_lo;                  libao_play();
57    }
58    
59  BOOL  RD_BOOL
60  wave_out_open(void)  libao_open(void)
61  {  {
62          ao_sample_format format;          ao_sample_format format;
63    
64          ao_initialize();          ao_initialize();
65          default_driver = ao_default_driver_id();  
66            if (libao_device)
67            {
68                    default_driver = ao_driver_id(libao_device);
69            }
70            else
71            {
72                    default_driver = ao_default_driver_id();
73            }
74    
75          format.bits = 16;          format.bits = 16;
76          format.channels = 2;          format.channels = 2;
         g_channels = 2;  
77          format.rate = 44100;          format.rate = 44100;
78          g_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 68  wave_out_open(void) Line 84  wave_out_open(void)
84                  return False;                  return False;
85          }          }
86    
87          g_dsp_fd = 0;          reopened = True;
         queue_lo = queue_hi = 0;  
   
         g_reopened = True;  
88    
89          return True;          return True;
90  }  }
91    
92  void  void
93  wave_out_close(void)  libao_close(void)
94  {  {
95          /* Ack all remaining packets */          /* Ack all remaining packets */
96          while (queue_lo != queue_hi)          while (!rdpsnd_queue_empty())
97          {          {
98                  rdpsnd_send_completion(packet_queue[queue_lo].tick, packet_queue[queue_lo].index);                  rdpsnd_queue_next(0);
                 free(packet_queue[queue_lo].s.data);  
                 queue_lo = (queue_lo + 1) % MAX_QUEUE;  
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  
 wave_out_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  wave_out_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;
         g_channels = pwfx->nChannels;  
116          format.rate = 44100;          format.rate = 44100;
117          g_samplerate = pwfx->nSamplesPerSec;          format.byte_format = AO_FMT_NATIVE;
         format.byte_format = AO_FMT_LITTLE;  
   
         g_samplewidth = pwfx->wBitsPerSample / 8;  
118    
119          if (o_device != NULL)          if (o_device != NULL)
120                  ao_close(o_device);                  ao_close(o_device);
# Line 133  wave_out_set_format(WAVEFORMATEX * pwfx) Line 125  wave_out_set_format(WAVEFORMATEX * pwfx)
125                  return False;                  return False;
126          }          }
127    
128          g_reopened = True;          if (rdpsnd_dsp_resample_set(44100, pwfx->wBitsPerSample, pwfx->nChannels) == False)
   
         return True;  
 }  
   
 void  
 wave_out_volume(uint16 left, uint16 right)  
 {  
         warning("volume changes not supported with libao-output\n");  
 }  
   
 void  
 wave_out_write(STREAM s, uint16 tick, uint8 index)  
 {  
         struct audio_packet *packet = &packet_queue[queue_hi];  
         unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;  
   
         if (next_hi == queue_lo)  
129          {          {
130                  error("No space to queue audio packet\n");                  return False;
                 return;  
131          }          }
132    
133          queue_hi = next_hi;          reopened = True;
   
         packet->s = *s;  
         packet->tick = tick;  
         packet->index = index;  
         packet->s.p += 4;  
134    
135          /* we steal the data buffer from s, give it a new one */          return True;
         s->data = malloc(s->size);  
   
         if (!g_dsp_busy)  
                 wave_out_play();  
136  }  }
137    
138  void  void
139  wave_out_play(void)  libao_play(void)
140  {  {
141          struct audio_packet *packet;          struct audio_packet *packet;
142          STREAM out;          STREAM out;
143          unsigned 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;
147          int next_tick;          int next_tick;
148    
149          if (g_reopened)          if (reopened)
150          {          {
151                  g_reopened = False;                  reopened = False;
152                  gettimeofday(&tv, NULL);                  gettimeofday(&tv, NULL);
153                  prev_s = tv.tv_sec;                  prev_s = tv.tv_sec;
154                  prev_us = tv.tv_usec;                  prev_us = tv.tv_usec;
155          }          }
156    
157          if (queue_lo == queue_hi)          /* We shouldn't be called if the queue is empty, but still */
158          {          if (rdpsnd_queue_empty())
                 g_dsp_busy = 0;  
159                  return;                  return;
         }  
160    
161          packet = &packet_queue[queue_lo];          packet = rdpsnd_queue_current_packet();
162          out = &packet->s;          out = &packet->s;
163    
164          if (((queue_lo + 1) % MAX_QUEUE) != queue_hi)          next_tick = rdpsnd_queue_next_tick();
         {  
                 next_tick = packet_queue[(queue_lo + 1) % MAX_QUEUE].tick;  
         }  
         else  
         {  
                 next_tick = (packet->tick + 65535) % 65536;  
         }  
   
         len = 0;  
   
         if (g_samplerate == 22050)  
         {  
                 /* Resample to 44100 */  
                 for (i = 0; (i < ((WAVEOUTBUF / 4) * (3 - g_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 (g_channels == 2)  
                                 offset = ((i * 2) - (i & 1)) * g_samplewidth;  
                         else  
                                 offset = (i * 2) * g_samplewidth;  
   
                         memcpy(&outbuf[offset], out->p, g_samplewidth);  
                         memcpy(&outbuf[g_channels * g_samplewidth + offset], out->p, g_samplewidth);  
165    
166                          out->p += g_samplewidth;          len = (WAVEOUTLEN > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTLEN;
167                          len += 2 * g_samplewidth;          ao_play(o_device, (char *) out->p, len);
168                  }          out->p += len;
         }  
         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 251  wave_out_play(void) Line 176  wave_out_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 261  wave_out_play(void) Line 188  wave_out_play(void)
188                                 (packet->tick + duration) % 65536, next_tick % 65536));                                 (packet->tick + duration) % 65536, next_tick % 65536));
189                  }                  }
190    
191                  /* Until all drivers are using the windows sound-ticks, we need to                  delay_us = ((out->size / 4) * (1000000 / 44100));
192                     substract the 50 ticks added later by rdpsnd.c */  
193                  rdpsnd_send_completion(((packet->tick + duration) % 65536) - 50, packet->index);                  rdpsnd_queue_next(delay_us);
194                  free(out->data);          }
195                  queue_lo = (queue_lo + 1) % MAX_QUEUE;  }
196    
197    struct audio_driver *
198    libao_register(char *options)
199    {
200            static struct audio_driver libao_driver;
201    
202            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;
211            libao_driver.wave_out_close = libao_close;
212            libao_driver.wave_out_format_supported = rdpsnd_dsp_resample_supported;
213            libao_driver.wave_out_set_format = libao_set_format;
214            libao_driver.wave_out_volume = rdpsnd_dsp_softvol_set;
215    
216            libao_driver.need_byteswap_on_be = 1;
217            libao_driver.need_resampling = 1;
218    
219            if (options)
220            {
221                    libao_device = xstrdup(options);
222          }          }
223    
224          g_dsp_busy = 1;          return &libao_driver;
         return;  
225  }  }
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