Fix audio "clicking" for strongbad demo

The strongbad demo plays an audio file of 11kHz. However we hardcoded
in the AudioRendererHost to always open an audio device of 8k samples
which happens to be too big for streams of 11khz. This makes the IPC
transport packet size much smaller than the hardware buffer size and
hardware packet is always partially filled.

This change allow the AudioRendererHost to designate the transport
packet size based on the hardware packet size. The hardware packet
size is now adjusted based on the sample rate.

BUG=46007
TEST=http://smokescreen.us/demos/sb45demo.html
The above audio plays fine.

Review URL: http://codereview.chromium.org/2651001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@49078 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 3 insertions, 9 deletions

diff --git a/chrome/common/render_messages.h b/chrome/common/render_messages.h
index 0f6419c..f5e4d72 100644
--- a/chrome/common/render_messages.h
+++ b/chrome/common/render_messages.h
@@ -466,11 +466,9 @@ struct ViewHostMsg_Audio_CreateStream_Params {
 
   // Number of bytes per packet. Determines the maximum number of bytes
   // transported for each audio packet request.
+  // A value of 0 means that the audio packet size is selected automatically
+  // by the browser process.
   uint32 packet_size;
-
-  // Maximum number of bytes of audio packets that should be kept in the browser
-  // process.
-  uint32 buffer_capacity;
 };
 
 // This message is used for supporting popup menus on Mac OS X using native
@@ -1791,7 +1789,6 @@ struct ParamTraits<ViewHostMsg_Audio_CreateStream_Params> {
     WriteParam(m, p.sample_rate);
     WriteParam(m, p.bits_per_sample);
     WriteParam(m, p.packet_size);
-    WriteParam(m, p.buffer_capacity);
   }
   static bool Read(const Message* m, void** iter, param_type* p) {
     return
@@ -1799,8 +1796,7 @@ struct ParamTraits<ViewHostMsg_Audio_CreateStream_Params> {
       ReadParam(m, iter, &p->channels) &&
       ReadParam(m, iter, &p->sample_rate) &&
       ReadParam(m, iter, &p->bits_per_sample) &&
-      ReadParam(m, iter, &p->packet_size) &&
-      ReadParam(m, iter, &p->buffer_capacity);
+      ReadParam(m, iter, &p->packet_size);
   }
   static void Log(const param_type& p, std::wstring* l) {
     l->append(L"<ViewHostMsg_Audio_CreateStream_Params>(");
@@ -1814,8 +1810,6 @@ struct ParamTraits<ViewHostMsg_Audio_CreateStream_Params> {
     l->append(L", ");
     LogParam(p.packet_size, l);
     l->append(L")");
-    LogParam(p.buffer_capacity, l);
-    l->append(L")");
   }
 };