Roll FFMpeg for M26. Fix ffmpeg float audio decoding.

media/filters/audio_file_reader.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/filters/audio_file_reader.h"
 
 #include "base/logging.h"
 #include "base/time.h"
 #include "media/base/audio_bus.h"
 #include "media/ffmpeg/ffmpeg_common.h"
@@ skipping 145 matching lines @@
       int frames_read = av_frame->nb_samples;
       if (frames_read < 0) {
         continue_decoding = false;
         break;
       }
 
       // Truncate, if necessary, if the destination isn't big enough.
       if (current_frame + frames_read > audio_bus->frames())
         frames_read = audio_bus->frames() - current_frame;
 
-      // Deinterleave each channel and convert to 32bit floating-point
-      // with nominal range -1.0 -> +1.0.
-      audio_bus->FromInterleavedPartial(
-          av_frame->data[0], current_frame, frames_read, bytes_per_sample);
+      // Deinterleave each channel and convert to 32bit floating-point with
+      // nominal range -1.0 -> +1.0.  If the output is already in float planar
+      // format, just copy it into the AudioBus.
+      if (codec_context_->sample_fmt == AV_SAMPLE_FMT_FLT) {
+        float* decoded_audio_data = reinterpret_cast<float*>(av_frame->data[0]);
+        int channels = audio_bus->channels();
+        for (int ch = 0; ch < channels; ++ch) {
+          float* bus_data = audio_bus->channel(ch) + current_frame;
+          for (int i = 0, offset = ch; i < frames_read;
+               ++i, offset += channels) {
+            bus_data[i] = decoded_audio_data[offset];
+          }
+        }
+      } else if (codec_context_->sample_fmt == AV_SAMPLE_FMT_FLTP) {
+        for (int ch = 0; ch < audio_bus->channels(); ++ch) {
+          memcpy(audio_bus->channel(ch) + current_frame,
+                 av_frame->extended_data[ch], sizeof(float) * frames_read);
+        }
+      } else {
+        audio_bus->FromInterleavedPartial(
+            av_frame->data[0], current_frame, frames_read, bytes_per_sample);
+      }
 
       current_frame += frames_read;
     } while (packet_temp.size > 0);
     av_free_packet(&packet);
   }
 
   // Zero any remaining frames.
   audio_bus->ZeroFramesPartial(
       current_frame, audio_bus->frames() - current_frame);
 
   // Returns the actual number of sample-frames decoded.
   // Ideally this represents the "true" exact length of the file.
   return current_frame;
 }
 
 }  // namespace media