/[rdesktop]/sourceforge.net/trunk/rdesktop/rdpsnd_libao.c
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revision 986 by astrand, Wed Aug 24 11:31:58 2005 UTC revision 1334 by stargo, Tue Nov 7 16:48:48 2006 UTC
# Line 3  Line 3 
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 "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 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;  
   
 static struct audio_packet  
 {  
         struct stream s;  
         uint16 tick;  
         uint8 index;  
 } packet_queue[MAX_QUEUE];  
 static unsigned int queue_hi, queue_lo;  
38    
39  BOOL  BOOL
40  wave_out_open(void)  libao_open(void)
41  {  {
42          ao_sample_format format;          ao_sample_format format;
43    
44          ao_initialize();          ao_initialize();
45          default_driver = ao_default_driver_id();  
46            if (libao_device)
47            {
48                    default_driver = ao_driver_id(libao_device);
49            }
50            else
51            {
52                    default_driver = ao_default_driver_id();
53            }
54    
55          format.bits = 16;          format.bits = 16;
56          format.channels = 2;          format.channels = 2;
         g_channels = 2;  
57          format.rate = 44100;          format.rate = 44100;
58          g_samplerate = 44100;          format.byte_format = AO_FMT_NATIVE;
59          format.byte_format = AO_FMT_LITTLE;  
60    
61          o_device = ao_open_live(default_driver, &format, NULL);          o_device = ao_open_live(default_driver, &format, NULL);
62          if (o_device == NULL)          if (o_device == NULL)
# Line 69  wave_out_open(void) Line 65  wave_out_open(void)
65          }          }
66    
67          g_dsp_fd = 0;          g_dsp_fd = 0;
         queue_lo = queue_hi = 0;  
68    
69          g_reopened = True;          reopened = True;
70    
71          return True;          return True;
72  }  }
73    
74  void  void
75  wave_out_close(void)  libao_close(void)
76  {  {
77          /* Ack all remaining packets */          /* Ack all remaining packets */
78          while (queue_lo != queue_hi)          while (!rdpsnd_queue_empty())
79          {          {
80                  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;  
81          }          }
82    
83          if (o_device != NULL)          if (o_device != NULL)
# Line 94  wave_out_close(void) Line 87  wave_out_close(void)
87  }  }
88    
89  BOOL  BOOL
90  wave_out_format_supported(WAVEFORMATEX * pwfx)  libao_set_format(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;  
   
         return True;  
 }  
   
 BOOL  
 wave_out_set_format(WAVEFORMATEX * pwfx)  
91  {  {
92          ao_sample_format format;          ao_sample_format format;
93    
94          format.bits = pwfx->wBitsPerSample;          format.bits = pwfx->wBitsPerSample;
95          format.channels = pwfx->nChannels;          format.channels = pwfx->nChannels;
         g_channels = pwfx->nChannels;  
96          format.rate = 44100;          format.rate = 44100;
97          g_samplerate = pwfx->nSamplesPerSec;          format.byte_format = AO_FMT_NATIVE;
         format.byte_format = AO_FMT_LITTLE;  
   
         g_samplewidth = pwfx->wBitsPerSample / 8;  
98    
99          if (o_device != NULL)          if (o_device != NULL)
100                  ao_close(o_device);                  ao_close(o_device);
# Line 133  wave_out_set_format(WAVEFORMATEX * pwfx) Line 105  wave_out_set_format(WAVEFORMATEX * pwfx)
105                  return False;                  return False;
106          }          }
107    
108          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)  
109          {          {
110                  error("No space to queue audio packet\n");                  return False;
                 return;  
111          }          }
112    
113          queue_hi = next_hi;          reopened = True;
   
         packet->s = *s;  
         packet->tick = tick;  
         packet->index = index;  
         packet->s.p += 4;  
114    
115          /* 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();  
116  }  }
117    
118  void  void
119  wave_out_play(void)  libao_play(void)
120  {  {
121          struct audio_packet *packet;          struct audio_packet *packet;
122          STREAM out;          STREAM out;
123          unsigned char outbuf[WAVEOUTBUF];          int len;
         int offset, len, i;  
124          static long prev_s, prev_us;          static long prev_s, prev_us;
125          unsigned int duration;          unsigned int duration;
126          struct timeval tv;          struct timeval tv;
127          int next_tick;          int next_tick;
128    
129          if (g_reopened)          if (reopened)
130          {          {
131                  g_reopened = False;                  reopened = False;
132                  gettimeofday(&tv, NULL);                  gettimeofday(&tv, NULL);
133                  prev_s = tv.tv_sec;                  prev_s = tv.tv_sec;
134                  prev_us = tv.tv_usec;                  prev_us = tv.tv_usec;
135          }          }
136    
137          if (queue_lo == queue_hi)          if (rdpsnd_queue_empty())
138          {          {
139                  g_dsp_busy = 0;                  g_dsp_busy = 0;
140                  return;                  return;
141          }          }
142    
143          packet = &packet_queue[queue_lo];          packet = rdpsnd_queue_current_packet();
144          out = &packet->s;          out = &packet->s;
145    
146          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);  
   
                         out->p += g_samplewidth;  
                         len += 2 * g_samplewidth;  
                 }  
         }  
         else  
         {  
                 len = (WAVEOUTBUF > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTBUF;  
                 memcpy(outbuf, out->p, len);  
                 out->p += len;  
         }  
147    
148          ao_play(o_device, (char *) outbuf, len);          len = (WAVEOUTLEN > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTLEN;
149            ao_play(o_device, (char *) out->p, len);
150            out->p += len;
151    
152          gettimeofday(&tv, NULL);          gettimeofday(&tv, NULL);
153    
# Line 261  wave_out_play(void) Line 168  wave_out_play(void)
168                                 (packet->tick + duration) % 65536, next_tick % 65536));                                 (packet->tick + duration) % 65536, next_tick % 65536));
169                  }                  }
170    
171                  /* Until all drivers are using the windows sound-ticks, we need to                  rdpsnd_queue_next(duration);
                    substract the 50 ticks added later by rdpsnd.c */  
                 rdpsnd_send_completion(((packet->tick + duration) % 65536) - 50, packet->index);  
                 free(out->data);  
                 queue_lo = (queue_lo + 1) % MAX_QUEUE;  
172          }          }
173    
174          g_dsp_busy = 1;          g_dsp_busy = 1;
175          return;          return;
176  }  }
177    
178    struct audio_driver *
179    libao_register(char *options)
180    {
181            static struct audio_driver libao_driver;
182    
183            libao_driver.wave_out_open = libao_open;
184            libao_driver.wave_out_close = libao_close;
185            libao_driver.wave_out_format_supported = rdpsnd_dsp_resample_supported;
186            libao_driver.wave_out_set_format = libao_set_format;
187            libao_driver.wave_out_volume = rdpsnd_dsp_softvol_set;
188            libao_driver.wave_out_play = libao_play;
189            libao_driver.name = xstrdup("libao");
190            libao_driver.description = xstrdup("libao output driver, default device: system dependent");
191            libao_driver.need_byteswap_on_be = 1;
192            libao_driver.need_resampling = 1;
193            libao_driver.next = NULL;
194    
195            if (options)
196            {
197                    libao_device = xstrdup(options);
198            }
199    
200            return &libao_driver;
201    }
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