Unbreak audio : Let ALSA enumerate audio devices rather than iterating

over physical devices.

Bump PORTREVISION

Submitted by:	George Liaskos
Obtained from:	http://crrev.com/11533016

1 files changed, 110 insertions, 0 deletions

diff --git a/www/chromium/files/patch-media__audio__linux__audio_manager_linux.cc b/www/chromium/files/patch-media__audio__linux__audio_manager_linux.cc
new file mode 100644
index 000000000000..294029875f95
--- /dev/null
+++ b/www/chromium/files/patch-media__audio__linux__audio_manager_linux.cc
@@ -0,0 +1,110 @@
+--- media/audio/linux/audio_manager_linux.cc.orig	2013-02-04 04:01:12.000000000 +0200
++++ media/audio/linux/audio_manager_linux.cc	2013-02-16 01:04:00.975548702 +0200
+@@ -126,22 +126,20 @@
+ void AudioManagerLinux::GetAlsaAudioInputDevices(
+     media::AudioDeviceNames* device_names) {
+   // Constants specified by the ALSA API for device hints.
++  static const int kGetAllDevices = -1;
+   static const char kPcmInterfaceName[] = "pcm";
+-  int card = -1;
+ 
+-  // Loop through the sound cards to get ALSA device hints.
+-  while (!wrapper_->CardNext(&card) && card >= 0) {
+-    void** hints = NULL;
+-    int error = wrapper_->DeviceNameHint(card, kPcmInterfaceName, &hints);
+-    if (!error) {
+-      GetAlsaDevicesInfo(hints, device_names);
+-
+-      // Destroy the hints now that we're done with it.
+-      wrapper_->DeviceNameFreeHint(hints);
+-    } else {
+-      DLOG(WARNING) << "GetAudioInputDevices: unable to get device hints: "
+-                    << wrapper_->StrError(error);
+-    }
++  void** hints = NULL;
++  int error =
++      wrapper_->DeviceNameHint(kGetAllDevices, kPcmInterfaceName, &hints);
++  if (!error) {
++    GetAlsaDevicesInfo(hints, device_names);
++
++    // Destroy the hints now that we're done with it.
++    wrapper_->DeviceNameFreeHint(hints);
++  } else {
++    DLOG(WARNING) << "GetAudioInputDevices: unable to get device hints: "
++                  << wrapper_->StrError(error);
+   }
+ }
+ 
+@@ -231,40 +229,47 @@
+ }
+ 
+ bool AudioManagerLinux::HasAnyAlsaAudioDevice(StreamType stream) {
++  // Constants specified by the ALSA API for device hints.
++  static const int kGetAllDevices = -1;
+   static const char kPcmInterfaceName[] = "pcm";
+   static const char kIoHintName[] = "IOID";
+   const char* kNotWantedDevice =
+       (stream == kStreamPlayback ? "Input" : "Output");
+   void** hints = NULL;
+   bool has_device = false;
+-  int card = -1;
+ 
+-  // Loop through the sound cards.
+-  // Don't use snd_device_name_hint(-1,..) since there is a access violation
+-  // inside this ALSA API with libasound.so.2.0.0.
+-  while (!wrapper_->CardNext(&card) && (card >= 0) && !has_device) {
+-    int error = wrapper_->DeviceNameHint(card, kPcmInterfaceName, &hints);
+-    if (!error) {
+-      for (void** hint_iter = hints; *hint_iter != NULL; hint_iter++) {
+-        // Only examine devices that are |stream| capable.  Valid values are
+-        // "Input", "Output", and NULL which means both input and output.
+-        scoped_ptr_malloc<char> io(wrapper_->DeviceNameGetHint(*hint_iter,
+-                                                               kIoHintName));
+-        if (io != NULL && strcmp(kNotWantedDevice, io.get()) == 0)
+-          continue;  // Wrong type, skip the device.
+-
+-        // Found an input device.
+-        has_device = true;
+-        break;
+-      }
++  // If checking for Input devices, only return true if there is an
++  // actual audio card. The bots have virtual audio input devices that do
++  // not actually generate samples, breaking some tests.
++  // See crbug.com/165401.
++  if (stream == kStreamCapture) {
++    int card = -1;
++    if (wrapper_->CardNext(&card) != 0 || card == -1)
++      return false;
++  }
+ 
+-      // Destroy the hints now that we're done with it.
+-      wrapper_->DeviceNameFreeHint(hints);
+-      hints = NULL;
+-    } else {
+-      DLOG(WARNING) << "HasAnyAudioDevice: unable to get device hints: "
+-                    << wrapper_->StrError(error);
++  int error =
++      wrapper_->DeviceNameHint(kGetAllDevices, kPcmInterfaceName, &hints);
++  if (!error) {
++    for (void** hint_iter = hints; *hint_iter != NULL; hint_iter++) {
++      // Only examine devices that are |stream| capable.  Valid values are
++      // "Input", "Output", and NULL which means both input and output.
++      scoped_ptr_malloc<char> io(wrapper_->DeviceNameGetHint(*hint_iter,
++                                                             kIoHintName));
++      if (io != NULL && strcmp(kNotWantedDevice, io.get()) == 0)
++        continue;  // Wrong type, skip the device.
++
++      // Found a device of the |stream| type.
++      has_device = true;
++      break;
+     }
++
++    // Destroy the hints now that we're done with it.
++    wrapper_->DeviceNameFreeHint(hints);
++    hints = NULL;
++  } else {
++    DLOG(WARNING) << "HasAnyAudioDevice: unable to get device hints: "
++                  << wrapper_->StrError(error);
+   }
+ 
+   return has_device;