Move library tree where it belongs

lib-src/portmixer/src/px_linux_alsa.c

@@ -0,0 +1,768 @@
+/*
+ * PortMixer
+ * Linux ALSA Implementation
+ *
+ * Copyright (c) 2002, 2006
+ *
+ * Written by Dominic Mazzoni
+ *        and Leland Lucius
+ *
+ * PortMixer is intended to work side-by-side with PortAudio,
+ * the Portable Real-Time Audio Library by Ross Bencina and
+ * Phil Burk.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * Any person wishing to distribute modifications to the Software is
+ * requested to send the modifications to the original developer so that
+ * they can be incorporated into the canonical version.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+ * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <alsa/asoundlib.h>
+
+#include "portaudio.h"
+#include "pa_unix_oss.h"
+
+#include "portmixer.h"
+#include "px_mixer.h"
+
+#if !defined(FALSE)
+#define FALSE 0
+#endif
+
+#if !defined(TRUE)
+#define TRUE 1
+#endif
+
+typedef struct PxSelem
+{
+   snd_mixer_elem_t *elem;
+   snd_mixer_elem_t *vol;
+   unsigned int index;
+   unsigned int item;
+   char *name;
+} PxSelem;
+
+typedef struct PxDev
+{
+   snd_mixer_t *handle;
+   int card;
+   int playback;
+   int source;
+
+   int numselems;
+   PxSelem *selems;
+} PxDev;
+
+typedef struct PxInfo
+{
+   int numMixers;
+   char *mixers;
+
+   PxDev playback;
+   PxDev capture;
+} PxInfo;
+
+static int open_mixer(PxDev *dev, int card, int playback)
+{
+   do {
+      snd_mixer_selem_id_t *sid;
+      snd_mixer_elem_t *elem;
+      char name[256];
+      int err;
+      int i;
+   
+      snd_mixer_selem_id_alloca(&sid);
+   
+      sprintf(name, "hw:%d", card);
+   
+      dev->card = card;
+      dev->handle = NULL;
+      dev->playback = playback;
+      dev->source = -1;
+   
+      err = snd_mixer_open(&dev->handle, 0);
+      if (err < 0) {
+         break;
+      }
+
+      err = snd_mixer_attach(dev->handle, name);
+      if (err < 0) {
+         break;
+      }
+
+      err = snd_mixer_selem_register(dev->handle, NULL, NULL);
+      if (err < 0) {
+         break;
+      }
+
+      err = snd_mixer_load(dev->handle);
+      if (err < 0) {
+         break;
+      }
+
+      for (elem = snd_mixer_first_elem(dev->handle);
+           elem != NULL;
+           elem = snd_mixer_elem_next(elem))
+      {
+         if (playback) {
+            if (snd_mixer_selem_has_common_volume(elem) ||
+                snd_mixer_selem_has_playback_volume(elem)) {
+               dev->numselems++;
+            }
+         }
+         else {
+            if (snd_mixer_selem_get_capture_group(elem) >= 0) {
+               dev->numselems++;
+            }
+            else if (snd_mixer_selem_is_enum_capture(elem)) {
+               dev->numselems += snd_mixer_selem_get_enum_items(elem);
+            }
+         }
+      }
+
+      dev->selems = calloc(dev->numselems, sizeof(PxSelem));
+      if (dev->selems == NULL) {
+         break;
+      }
+
+
+      i = 0;
+      for (elem = snd_mixer_first_elem(dev->handle);
+           elem != NULL;
+           elem = snd_mixer_elem_next(elem))
+      {
+         snd_mixer_elem_t *vol;
+         int ndx;
+
+         if (playback) {
+            if (snd_mixer_selem_has_common_volume(elem) ||
+                snd_mixer_selem_has_playback_volume(elem)) {
+               snprintf(name,
+                        sizeof(name),
+                        "%s:%d",
+                        snd_mixer_selem_get_name(elem),
+                        snd_mixer_selem_get_index(elem));
+      
+               dev->selems[i].elem = elem;
+               dev->selems[i].index = snd_mixer_selem_get_index(elem);
+               dev->selems[i].name = strdup(name);
+               if (!dev->selems[i].name) {
+                  break;
+               }
+               i++;
+            }
+            continue;
+         }
+
+         snd_mixer_selem_id_set_name(sid, "Capture");
+         snd_mixer_selem_id_set_index(sid, snd_mixer_selem_get_index(elem));
+         vol = snd_mixer_find_selem(dev->handle, sid);
+
+         if (snd_mixer_selem_get_capture_group(elem) >= 0) {
+            snprintf(name,
+                     sizeof(name),
+                     "%s:%d",
+                     snd_mixer_selem_get_name(elem),
+                     snd_mixer_selem_get_index(elem));
+
+            dev->selems[i].vol = vol;
+            dev->selems[i].elem = elem;
+            dev->selems[i].index = snd_mixer_selem_get_index(elem);
+            dev->selems[i].name = strdup(name);
+            if (!dev->selems[i].name) {
+               break;
+            }
+            i++;
+         }
+         else if (snd_mixer_selem_is_enum_capture(elem)) {
+            unsigned int cnt = snd_mixer_selem_get_enum_items(elem);
+            unsigned int j;
+
+            for (j = 0; j < cnt; j++) {
+               char iname[256];
+               snd_mixer_selem_get_enum_item_name(elem, j, sizeof(iname), iname);
+               snprintf(name,
+                        sizeof(name),
+                        "%s:%d",
+                        iname,
+                        snd_mixer_selem_get_index(elem));
+
+               dev->selems[i].vol = vol;
+               dev->selems[i].item = j;
+               dev->selems[i].elem = elem;
+               dev->selems[i].index = snd_mixer_selem_get_index(elem);
+               dev->selems[i].name = strdup(name);
+               if (!dev->selems[i].name) {
+                  break;
+               }
+               i++;
+            }
+         }
+      }
+
+      if (i != dev->numselems) {
+         break;
+      }
+
+      if (playback) {
+         return TRUE;
+      }
+
+      for (i = 0; i < dev->numselems; i++) {
+         elem = dev->selems[i].elem;
+         if (snd_mixer_selem_get_capture_group(elem) >= 0) {
+            int sw = 0;
+            if (snd_mixer_selem_get_capture_switch(elem, SND_MIXER_SCHN_FRONT_LEFT, &sw) < 0) {
+               continue;
+            }
+            if (!sw) {
+               continue;
+            }
+            dev->source = i;
+            break;
+         }
+         else if (snd_mixer_selem_is_enum_capture(elem)) {
+            unsigned int src;
+            if (snd_mixer_selem_get_enum_item(elem, SND_MIXER_SCHN_FRONT_LEFT, &src) < 0) {
+               continue;
+            }
+            if (src == dev->selems[i].item) {
+               dev->source = i;
+               break;
+            }
+         }
+      }
+
+      if (dev->source == -1) {
+         dev->source = 0;
+      }
+
+      return TRUE;
+
+   } while (FALSE);
+
+   if (dev->selems) {
+      int i;
+      for (i = 0; i < dev->numselems; i++) {
+         if (dev->selems[i].name) {
+            free(dev->selems[i].name);
+         }
+      }
+      free(dev->selems);
+      dev->selems = NULL;
+   }
+
+   if (dev->handle) {
+      snd_mixer_close(dev->handle);
+      dev->handle = NULL;
+   }
+
+   return FALSE;
+}
+
+int OpenMixer_Linux_ALSA(px_mixer *Px, int index)
+{
+   PxInfo *info;
+   int card;
+
+   if (!initialize(Px)) {
+      return FALSE;
+   }
+
+   info = (PxInfo *) Px->info;
+
+   if (PaAlsa_GetStreamInputCard(Px->pa_stream, &card) == paNoError) {
+      if (!open_mixer(&info->capture, card, FALSE)) {
+         return cleanup(Px);
+      }
+   }
+
+   if (PaAlsa_GetStreamOutputCard(Px->pa_stream, &card) == paNoError) {
+      if (!open_mixer(&info->playback, card, TRUE)) {
+         return cleanup(Px);
+      }
+   }
+
+   return TRUE;
+}
+
+static int initialize(px_mixer *Px)
+{
+   Px->info = calloc(1, sizeof(PxInfo));
+   if (Px->info == NULL) {
+      return FALSE;
+   }
+
+   Px->CloseMixer = close_mixer;
+   Px->GetNumMixers = get_num_mixers;
+   Px->GetMixerName = get_mixer_name;
+   Px->GetMasterVolume = get_master_volume;
+   Px->SetMasterVolume = set_master_volume;
+   Px->SupportsPCMOutputVolume = supports_pcm_output_volume;
+   Px->GetPCMOutputVolume = get_pcm_output_volume;
+   Px->SetPCMOutputVolume = set_pcm_output_volume;
+   Px->GetNumOutputVolumes = get_num_output_volumes;
+   Px->GetOutputVolumeName = get_output_volume_name;
+   Px->GetOutputVolume = get_output_volume;
+   Px->SetOutputVolume = set_output_volume;
+   Px->GetNumInputSources = get_num_input_sources;
+   Px->GetInputSourceName = get_input_source_name;
+   Px->GetCurrentInputSource = get_current_input_source;
+   Px->SetCurrentInputSource = set_current_input_source;
+   Px->GetInputVolume = get_input_volume;
+   Px->SetInputVolume = set_input_volume;
+   
+//   Px->SupportsOutputBalance = supports_output_balance;
+//   Px->GetOutputBalance = get_output_balance;
+//   Px->SetOutputBalance = set_output_balance; 
+//   Px->SupportsPlaythrough = supports_play_through;
+//   Px->GetPlaythrough = get_play_through;
+//   Px->SetPlaythrough = set_play_through;
+   
+   return TRUE;
+}
+
+static int cleanup(px_mixer *Px)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+   int i;
+
+   if (info->capture.selems) {
+      for (i = 0; i < info->capture.numselems; i++) {
+         if (info->capture.selems[i].name) {
+            free(info->capture.selems[i].name);
+         }
+      }
+      free(info->capture.selems);
+   }
+
+   if (info->capture.handle) {
+      snd_mixer_close(info->capture.handle);
+   }
+
+   if (info->playback.selems) {
+      for (i = 0; i < info->playback.numselems; i++) {
+         if (info->playback.selems[i].name) {
+            free(info->playback.selems[i].name);
+         }
+      }
+      free(info->playback.selems);
+   }
+
+  if (info->playback.handle) {
+      snd_mixer_close(info->playback.handle);
+   }
+
+   if (info) {
+      free(info);
+      Px->info = NULL;
+   }
+
+   return FALSE;
+}
+
+static int generic_lookup(PxDev *dev, const char *generic)
+{
+   snd_mixer_selem_id_t *id;
+   snd_mixer_elem_t *elem;
+   int i;
+
+   if (dev == NULL) {
+      return -1;
+   }
+
+   for (i = 0; i < dev->numselems; i++) {
+      if (strncmp(dev->selems[i].name, generic, strlen(generic)) == 0) {
+         return i;
+      }
+   }
+
+   return -1;
+}
+
+static PxVolume get_volume_indexed(PxDev *dev, int i)
+{
+   snd_mixer_elem_t *elem;
+   long vol, min, max;
+
+   if (!dev->handle) {
+      return 0.0;
+   }
+
+   if (i < 0 || i > dev->numselems) {
+      return 0.0;
+   }
+
+   elem = dev->selems[i].elem;
+   if (dev->playback) {
+      snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
+      if (snd_mixer_selem_has_playback_channel(elem, SND_MIXER_SCHN_FRONT_LEFT)) {
+         snd_mixer_selem_get_playback_volume(elem, SND_MIXER_SCHN_FRONT_LEFT, &vol);
+         return (PxVolume) vol / (max - min);
+      }
+   }
+   else {
+      snd_mixer_selem_get_capture_volume_range(elem, &min, &max);
+      if (snd_mixer_selem_has_capture_channel(elem, SND_MIXER_SCHN_FRONT_LEFT)) {
+         snd_mixer_selem_get_capture_volume(elem, SND_MIXER_SCHN_FRONT_LEFT, &vol);
+         return (PxVolume) vol / (max - min);
+      }
+   }
+   
+   return 0.0;
+}
+
+static PxVolume get_volume(PxDev *dev, const char *name)
+{
+   int i;
+
+   if (!dev->handle) {
+      return 0.0;
+   }
+
+   for (i = 0; i < dev->numselems; i++) {
+      if (strcmp(dev->selems[i].name, name) == 0) {
+         return get_volume_indexed(dev, i);
+      }
+   }
+
+   return 0.0;
+}
+
+static void set_volume_indexed(PxDev *dev, int i, PxVolume volume)
+{
+   snd_mixer_elem_t *elem;
+   long vol, min, max;
+   int j;
+
+   if (!dev->handle) {
+      return;
+   }
+
+   if (i < 0 || i > dev->numselems) {
+      return;
+   }
+
+   elem = dev->selems[i].elem;
+   if (dev->playback) {
+      snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
+      for (j = 0; j < SND_MIXER_SCHN_LAST; j++) {
+         if (snd_mixer_selem_has_playback_channel(elem, j)) {
+            vol = (long) (volume * (max - min) + 0.5);
+            snd_mixer_selem_set_playback_volume(elem, j, vol);
+         }
+      }
+   }
+   else {
+      snd_mixer_selem_get_capture_volume_range(elem, &min, &max);
+      for (j = 0; j < SND_MIXER_SCHN_LAST; j++) {
+         if (snd_mixer_selem_has_capture_channel(elem, j)) {
+            vol = (long) (volume * (max - min) + 0.5);
+            snd_mixer_selem_set_capture_volume(elem, j, vol);
+         }
+      }
+   }
+
+   return;
+}
+
+static void set_volume(PxDev *dev, const char *name, PxVolume volume)
+{
+   int i;
+
+   if (!dev->handle) {
+      return;
+   }
+
+   for (i = 0; i < dev->numselems; i++) {
+      if (strcmp(dev->selems[i].name, name) == 0) {
+         set_volume_indexed(dev, i, volume);
+         break;
+      }
+   }
+
+   return;
+}
+
+static void close_mixer(px_mixer *Px)
+{
+   cleanup(Px);
+
+   return;
+}
+
+static int get_num_mixers(px_mixer *Px)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+
+   return 1;
+}
+
+static const char *get_mixer_name(px_mixer *Px, int i)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+
+   return "ALSA";
+}
+
+/*
+|| Master volume
+*/
+
+static PxVolume get_master_volume(px_mixer *Px)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+   PxDev *dev = &info->playback;
+
+   return get_volume_indexed(dev, generic_lookup(dev, "Master"));
+}
+
+static void set_master_volume(px_mixer *Px, PxVolume volume)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+   PxDev *dev = &info->playback;
+
+   set_volume_indexed(dev, generic_lookup(dev, "Master"), volume);
+
+   /* Ensure pending events are handled...otherwise, they build up */
+   if (dev->handle)
+      snd_mixer_handle_events(dev->handle);
+
+   return;
+}
+
+/* 
+|| Main output volume
+*/
+
+static int supports_pcm_output_volume(px_mixer *Px)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+   PxDev *dev = &info->playback;
+
+   return generic_lookup(dev, "PCM") != -1;
+}
+
+static PxVolume get_pcm_output_volume(px_mixer *Px)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+   PxDev *dev = &info->playback;
+
+   return get_volume_indexed(dev, generic_lookup(dev, "PCM"));
+}
+
+static void set_pcm_output_volume(px_mixer *Px, PxVolume volume)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+   PxDev *dev = &info->playback;
+
+   set_volume_indexed(dev, generic_lookup(dev, "PCM"), volume);
+
+   /* Ensure pending events are handled...otherwise, they build up */
+   if (dev->handle)
+      snd_mixer_handle_events(dev->handle);
+
+   return;
+}
+
+/*
+|| All output volumes
+*/
+
+static int get_num_output_volumes(px_mixer *Px)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+
+   if (info->playback.handle) {
+      return info->playback.numselems;
+   }
+
+   return 0;
+}
+
+static const char *get_output_volume_name(px_mixer *Px, int i)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+
+   if (info->playback.handle) {
+      if (i >= 0 && i < info->playback.numselems) {
+         return info->playback.selems[i].name;
+      }
+   }
+
+   return NULL;
+}
+
+static PxVolume get_output_volume(px_mixer *Px, int i)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+
+   return get_volume_indexed(&info->playback, i);
+}
+
+static void set_output_volume(px_mixer *Px, int i, PxVolume volume)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+
+   set_volume_indexed(&info->playback, i, volume);
+
+   return;
+}
+
+/*
+|| Input source
+*/
+
+static int get_num_input_sources(px_mixer *Px)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+
+   if (info->capture.handle) {
+      return info->capture.numselems;
+   }
+
+   return 0;
+}
+
+static const char *get_input_source_name(px_mixer *Px, int i)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+
+   if (info->capture.handle) {
+      if (i >= 0 && i < info->capture.numselems) {
+         return info->capture.selems[i].name;
+      }
+   }
+
+   return NULL;
+}
+
+static int get_current_input_source(px_mixer *Px)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+   snd_mixer_elem_t *elem;
+   int i;
+
+   if (!info->capture.handle) {
+      return -1;
+   }
+
+   return info->capture.source;
+}
+
+static void set_current_input_source(px_mixer *Px, int i)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+   snd_mixer_elem_t *elem;
+
+   if (!info->capture.handle) {
+      return;
+   }
+
+   if (i < 0 || i >= info->capture.numselems) {
+      return;
+   }
+
+   elem = info->capture.selems[i].elem;
+   if (snd_mixer_selem_get_capture_group(elem) >= 0) {
+      snd_mixer_selem_set_capture_switch_all(elem, TRUE);
+   }
+   else if (snd_mixer_selem_is_enum_capture(elem)) {
+      int j;
+      for (j = 0; j < SND_MIXER_SCHN_LAST; j++) {
+         snd_mixer_selem_set_enum_item(elem, j, info->capture.selems[i].item);
+      }
+   }
+
+   info->capture.source = i;
+
+   /* Ensure pending events are handled...otherwise, they build up */
+   snd_mixer_handle_events(info->capture.handle);
+
+   set_input_volume(Px, get_input_volume(Px));
+
+   return;
+}
+
+/*
+|| Input volume
+*/
+
+static PxVolume get_input_volume(px_mixer *Px)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+   snd_mixer_elem_t *elem;
+   long min;
+   long max;
+   long vol;
+   PxVolume volume = 0.0;
+
+   if (info->capture.source < 0 || info->capture.numselems < 1) {
+      return volume;
+   }
+
+   elem = info->capture.selems[info->capture.source].vol;
+   if (!elem) {
+      return volume;
+   }
+
+   snd_mixer_selem_get_capture_volume_range(elem, &min, &max);
+   if (snd_mixer_selem_has_capture_channel(elem, SND_MIXER_SCHN_FRONT_LEFT)) {
+      snd_mixer_selem_get_capture_volume(elem, SND_MIXER_SCHN_FRONT_LEFT, &vol);
+      volume = ((PxVolume) vol) / (max - min);
+   }
+
+   return volume;
+}
+
+static void set_input_volume(px_mixer *Px, PxVolume volume)
+{
+   PxInfo *info = (PxInfo *)Px->info;
+   snd_mixer_elem_t *elem;
+   long min;
+   long max;
+   long vol;
+
+   if (info->capture.source < 0 || info->capture.numselems < 1) {
+      return;
+   }
+
+   elem = info->capture.selems[info->capture.source].vol;
+   if (!elem) {
+      return;
+   }
+
+   snd_mixer_selem_get_capture_volume_range(elem, &min, &max);
+   vol = (long) (volume * (max - min) + 0.5);
+   snd_mixer_selem_set_capture_volume_all(elem, vol);
+
+   if (snd_mixer_selem_has_capture_switch(elem)) {
+      snd_mixer_selem_set_capture_switch_all(elem, vol > 0 ? TRUE : FALSE);
+   }
+
+   /* Ensure pending events are handled...otherwise, they build up */
+   snd_mixer_handle_events(info->capture.handle);
+
+   return;
+}