Support floating-point audio output for Linux

media/audio/pulse/pulse_util.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/audio/pulse/pulse_util.h"
 
 #include <stdint.h>
 
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 161 matching lines @@
                        pa_stream** stream,
                        const AudioParameters& params,
                        const std::string& device_id,
                        pa_stream_notify_cb_t stream_callback,
                        void* user_data) {
   DCHECK(mainloop);
   DCHECK(context);
 
   // Set sample specifications.
   pa_sample_spec sample_specifications;
+#if 1

[DaleCurtis, 2016/11/01 18:51:37]

#if 0?

[Raymond Toy, 2016/11/01 20:00:50]

This is for the input stream. I don't want to change that yet.

   sample_specifications.format = BitsToPASampleFormat(
       params.bits_per_sample());
+#else
+  sample_specifications.format = PA_SAMPLE_FLOAT32;
+#endif
   sample_specifications.rate = params.sample_rate();
   sample_specifications.channels = params.channels();
 
   // Get channel mapping and open recording stream.
   pa_channel_map source_channel_map = ChannelLayoutToPAChannelMap(
       params.channel_layout());
   pa_channel_map* map = (source_channel_map.channels != 0) ?
       &source_channel_map : NULL;
 
   // Create a new recording stream and
@@ skipping 84 matching lines @@
     pa_context_state_t context_state = pa_context_get_state(*context);
     RETURN_ON_FAILURE(PA_CONTEXT_IS_GOOD(context_state),
                       "Invalid PulseAudio context state.");
     if (context_state == PA_CONTEXT_READY)
       break;
     pa_threaded_mainloop_wait(*mainloop);
   }
 
   // Set sample specifications.
   pa_sample_spec sample_specifications;
+#if 0
   sample_specifications.format = BitsToPASampleFormat(
       params.bits_per_sample());
+#else
+  sample_specifications.format = PA_SAMPLE_FLOAT32;
+#endif
   sample_specifications.rate = params.sample_rate();
   sample_specifications.channels = params.channels();
 
   // Get channel mapping.
   pa_channel_map* map = NULL;
   pa_channel_map source_channel_map = ChannelLayoutToPAChannelMap(
       params.channel_layout());
   if (source_channel_map.channels != 0) {
     // The source data uses a supported channel map so we will use it rather
     // than the default channel map (NULL).
@@ skipping 59 matching lines @@
   }
 
   return true;
 }
 
 #undef RETURN_ON_FAILURE
 
 }  // namespace pulse
 
 }  // namespace media