/[rdesktop]/sourceforge.net/rdesktop/trunk/rdpsnd.c

This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!

Diff of /sourceforge.net/rdesktop/trunk/rdpsnd.c

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-revision 435 by astrand,
Wed Jul  9 09:18:20 2003 UTC
+revision 1271 by stargo,
Mon Sep 18 21:42:50 2006 UTC
 Line 1
+ /* -*- c-basic-offset: 8 -*-
+    rdesktop: A Remote Desktop Protocol client.
+    Sound Channel Process Functions
+    Copyright (C) Matthew Chapman 2003
+    Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
  #include "rdesktop.h"
+ #include "rdpsnd.h"
+ #include "rdpsnd_dsp.h"
+ #define RDPSND_CLOSE            1
+ #define RDPSND_WRITE            2
+ #define RDPSND_SET_VOLUME       3
+ #define RDPSND_UNKNOWN4         4
+ #define RDPSND_COMPLETION       5
+ #define RDPSND_SERVERTICK       6
+ #define RDPSND_NEGOTIATE        7
+ #define MAX_FORMATS             10
+ #define MAX_QUEUE               10
+ BOOL g_dsp_busy = False;
+ int g_dsp_fd;
  static VCHANNEL *rdpsnd_channel;
+ static struct audio_driver *drivers = NULL;
+ struct audio_driver *current_driver = NULL;
+ static BOOL device_open;
+ static WAVEFORMATEX formats[MAX_FORMATS];
+ static unsigned int format_count;
+ static unsigned int current_format;
+ unsigned int queue_hi, queue_lo;
+ struct audio_packet packet_queue[MAX_QUEUE];
+ void (*wave_out_play) (void);
+ static STREAM
+ rdpsnd_init_packet(uint16 type, uint16 size)
+ {
+         STREAM s;
+         s = channel_init(rdpsnd_channel, size + 4);
+         out_uint16_le(s, type);
+         out_uint16_le(s, size);
+         return s;
+ }
+ static void
+ rdpsnd_send(STREAM s)
+ {
+ #ifdef RDPSND_DEBUG
+         printf("RDPSND send:\n");
+         hexdump(s->channel_hdr + 8, s->end - s->channel_hdr - 8);
+ #endif
+         channel_send(s, rdpsnd_channel);
+ }
+ void
+ rdpsnd_send_completion(uint16 tick, uint8 packet_index)
+ {
+         STREAM s;
+         s = rdpsnd_init_packet(RDPSND_COMPLETION, 4);
+         out_uint16_le(s, tick);
+         out_uint8(s, packet_index);
+         out_uint8(s, 0);
+         s_mark_end(s);
+         rdpsnd_send(s);
+ }
+ static void
+ rdpsnd_process_negotiate(STREAM in)
+ {
+         unsigned int in_format_count, i;
+         WAVEFORMATEX *format;
+         STREAM out;
+         BOOL device_available = False;
+         int readcnt;
+         int discardcnt;
+         in_uint8s(in, 14);      /* flags, volume, pitch, UDP port */
+         in_uint16_le(in, in_format_count);
+         in_uint8s(in, 4);       /* pad, status, pad */
+         if (current_driver->wave_out_open())
+         {
+                 current_driver->wave_out_close();
+                 device_available = True;
+         }
+         format_count = 0;
+         if (s_check_rem(in, 18 * in_format_count))
+         {
+                 for (i = 0; i < in_format_count; i++)
+                 {
+                         format = &formats[format_count];
+                         in_uint16_le(in, format->wFormatTag);
+                         in_uint16_le(in, format->nChannels);
+                         in_uint32_le(in, format->nSamplesPerSec);
+                         in_uint32_le(in, format->nAvgBytesPerSec);
+                         in_uint16_le(in, format->nBlockAlign);
+                         in_uint16_le(in, format->wBitsPerSample);
+                         in_uint16_le(in, format->cbSize);
+                         /* read in the buffer of unknown use */
+                         readcnt = format->cbSize;
+                         discardcnt = 0;
+                         if (format->cbSize > MAX_CBSIZE)
+                         {
+                                 fprintf(stderr, "cbSize too large for buffer: %d\n",
+                                         format->cbSize);
+                                 readcnt = MAX_CBSIZE;
+                                 discardcnt = format->cbSize - MAX_CBSIZE;
+                         }
+                         in_uint8a(in, format->cb, readcnt);
+                         in_uint8s(in, discardcnt);
+                         if (device_available && current_driver->wave_out_format_supported(format))
+                         {
+                                 format_count++;
+                                 if (format_count == MAX_FORMATS)
+                                         break;
+                         }
+                 }
+         }
+         out = rdpsnd_init_packet(RDPSND_NEGOTIATE | 0x200, 20 + 18 * format_count);
+         out_uint32_le(out, 3);  /* flags */
+         out_uint32(out, 0xffffffff);    /* volume */
+         out_uint32(out, 0);     /* pitch */
+         out_uint16(out, 0);     /* UDP port */
+         out_uint16_le(out, format_count);
+         out_uint8(out, 0x95);   /* pad? */
+         out_uint16_le(out, 2);  /* status */
+         out_uint8(out, 0x77);   /* pad? */
+         for (i = 0; i < format_count; i++)
+         {
+                 format = &formats[i];
+                 out_uint16_le(out, format->wFormatTag);
+                 out_uint16_le(out, format->nChannels);
+                 out_uint32_le(out, format->nSamplesPerSec);
+                 out_uint32_le(out, format->nAvgBytesPerSec);
+                 out_uint16_le(out, format->nBlockAlign);
+                 out_uint16_le(out, format->wBitsPerSample);
+                 out_uint16(out, 0);     /* cbSize */
+         }
+         s_mark_end(out);
+         rdpsnd_send(out);
+ }
+ static void
+ rdpsnd_process_servertick(STREAM in)
+ {
+         uint16 tick1, tick2;
+         STREAM out;
+         /* in_uint8s(in, 4); unknown */
+         in_uint16_le(in, tick1);
+         in_uint16_le(in, tick2);
+         out = rdpsnd_init_packet(RDPSND_SERVERTICK | 0x2300, 4);
+         out_uint16_le(out, tick1);
+         out_uint16_le(out, tick2);
+         s_mark_end(out);
+         rdpsnd_send(out);
+ }
  static void
  rdpsnd_process(STREAM s)
  {
-         printf("rdpsnd_process\n");
+         uint8 type;
+         uint16 datalen;
+         uint32 volume;
+         static uint16 tick, format;
+         static uint8 packet_index;
+         static BOOL awaiting_data_packet;
+         static unsigned char missing_bytes[4] = { 0, 0, 0, 0 };
+ #ifdef RDPSND_DEBUG
+         printf("RDPSND recv:\n");
          hexdump(s->p, s->end - s->p);
+ #endif
+         if (awaiting_data_packet)
+         {
+                 if (format >= MAX_FORMATS)
+                 {
+                         error("RDPSND: Invalid format index\n");
+                         return;
+                 }
+                 if (!device_open || (format != current_format))
+                 {
+                         if (!device_open && !current_driver->wave_out_open())
+                         {
+                                 rdpsnd_send_completion(tick, packet_index);
+                                 return;
+                         }
+                         if (!current_driver->wave_out_set_format(&formats[format]))
+                         {
+                                 rdpsnd_send_completion(tick, packet_index);
+                                 current_driver->wave_out_close();
+                                 device_open = False;
+                                 return;
+                         }
+                         device_open = True;
+                         current_format = format;
+                 }
+                 /* Insert the 4 missing bytes retrieved from last RDPSND_WRITE */
+                 memcpy(s->data, missing_bytes, 4);
+                 current_driver->
+                         wave_out_write(rdpsnd_dsp_process
+                                        (s, current_driver, &formats[current_format]), tick,
+                                        packet_index);
+                 awaiting_data_packet = False;
+                 return;
+         }
+         in_uint8(s, type);
+         in_uint8s(s, 1);        /* unknown? */
+         in_uint16_le(s, datalen);
+         switch (type)
+         {
+                 case RDPSND_WRITE:
+                         in_uint16_le(s, tick);
+                         in_uint16_le(s, format);
+                         in_uint8(s, packet_index);
+                         /* Here are our lost bytes, but why? */
+                         memcpy(missing_bytes, s->end - 4, 4);
+                         awaiting_data_packet = True;
+                         break;
+                 case RDPSND_CLOSE:
+                         current_driver->wave_out_close();
+                         device_open = False;
+                         break;
+                 case RDPSND_NEGOTIATE:
+                         rdpsnd_process_negotiate(s);
+                         break;
+                 case RDPSND_SERVERTICK:
+                         rdpsnd_process_servertick(s);
+                         break;
+                 case RDPSND_SET_VOLUME:
+                         in_uint32(s, volume);
+                         if (device_open)
+                         {
+                                 current_driver->wave_out_volume((volume & 0xffff),
+                                                                 (volume & 0xffff0000) >> 16);
+                         }
+                         break;
+                 default:
+                         unimpl("RDPSND packet type %d\n", type);
+                         break;
+         }
  }
  BOOL
-Line 15 
 rdpsnd_init(void)
+Line 282 
 rdpsnd_init(void)
          rdpsnd_channel =
                  channel_register("rdpsnd", CHANNEL_OPTION_INITIALIZED | CHANNEL_OPTION_ENCRYPT_RDP,
                                   rdpsnd_process);
          return (rdpsnd_channel != NULL);
  }
+ BOOL
+ rdpsnd_auto_open(void)
+ {
+         static BOOL failed = False;
+         if (!failed)
+         {
+                 struct audio_driver *auto_driver = current_driver;
+                 current_driver = drivers;
+                 while (current_driver != NULL)
+                 {
+                         DEBUG(("trying %s...\n", current_driver->name));
+                         if (current_driver->wave_out_open())
+                         {
+                                 DEBUG(("selected %s\n", current_driver->name));
+                                 return True;
+                         }
+                         g_dsp_fd = 0;
+                         current_driver = current_driver->next;
+                 }
+                 warning("no working audio-driver found\n");
+                 failed = True;
+                 current_driver = auto_driver;
+         }
+         return False;
+ }
+ void
+ rdpsnd_register_drivers(char *options)
+ {
+         struct audio_driver **reg;
+         /* The order of registrations define the probe-order
+            when opening the device for the first time */
+         reg = &drivers;
+ #if defined(RDPSND_ALSA)
+         *reg = alsa_register(options);
+         reg = &((*reg)->next);
+ #endif
+ #if defined(RDPSND_SUN)
+         *reg = sun_register(options);
+         reg = &((*reg)->next);
+ #endif
+ #if defined(RDPSND_OSS)
+         *reg = oss_register(options);
+         reg = &((*reg)->next);
+ #endif
+ #if defined(RDPSND_SGI)
+         *reg = sgi_register(options);
+         reg = &((*reg)->next);
+ #endif
+ #if defined(RDPSND_LIBAO)
+         *reg = libao_register(options);
+         reg = &((*reg)->next);
+ #endif
+ }
+ BOOL
+ rdpsnd_select_driver(char *driver, char *options)
+ {
+         static struct audio_driver auto_driver;
+         struct audio_driver *pos;
+         drivers = NULL;
+         rdpsnd_register_drivers(options);
+         if (!driver)
+         {
+                 auto_driver.wave_out_open = &rdpsnd_auto_open;
+                 current_driver = &auto_driver;
+                 return True;
+         }
+         pos = drivers;
+         while (pos != NULL)
+         {
+                 if (!strcmp(pos->name, driver))
+                 {
+                         DEBUG(("selected %s\n", pos->name));
+                         current_driver = pos;
+                         return True;
+                 }
+                 pos = pos->next;
+         }
+         return False;
+ }
+ void
+ rdpsnd_show_help(void)
+ {
+         struct audio_driver *pos;
+         rdpsnd_register_drivers(NULL);
+         pos = drivers;
+         while (pos != NULL)
+         {
+                 fprintf(stderr, "                     %s:\t%s\n", pos->name, pos->description);
+                 pos = pos->next;
+         }
+ }
+ inline void
+ rdpsnd_play(void)
+ {
+         current_driver->wave_out_play();
+ }
+ void
+ rdpsnd_queue_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)
+         {
+                 error("No space to queue audio packet\n");
+                 return;
+         }
+         queue_hi = next_hi;
+         packet->s = *s;
+         packet->tick = tick;
+         packet->index = index;
+         if (!g_dsp_busy)
+                 current_driver->wave_out_play();
+ }
+ inline struct audio_packet *
+ rdpsnd_queue_current_packet(void)
+ {
+         return &packet_queue[queue_lo];
+ }
+ inline BOOL
+ rdpsnd_queue_empty(void)
+ {
+         return (queue_lo == queue_hi);
+ }
+ inline void
+ rdpsnd_queue_init(void)
+ {
+         queue_lo = queue_hi = 0;
+ }
+ inline void
+ rdpsnd_queue_next(void)
+ {
+         xfree(packet_queue[queue_lo].s.data);
+         queue_lo = (queue_lo + 1) % MAX_QUEUE;
+ }
+ inline int
+ rdpsnd_queue_next_tick(void)
+ {
+         if (((queue_lo + 1) % MAX_QUEUE) != queue_hi)
+         {
+                 return packet_queue[(queue_lo + 1) % MAX_QUEUE].tick;
+         }
+         else
+         {
+                 return (packet_queue[queue_lo].tick + 65535) % 65536;
+         }
+ }

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