b=938450 process all input samples in decodeAudioData r=padenot

--HG--
extra : transplant_source : %01%B2%FE%DA%BE%2CcX%B9%A7%60%15%FB%08%C5%2AS%99%B28

content/media/webaudio/MediaBufferDecoder.cpp

@@ -346,15 +346,11 @@ MediaDecodeTask::Decode()
       (audioData->mAudioBuffer->Data());
 
     if (sampleRate != destSampleRate) {
-      const uint32_t expectedOutSamples = static_cast<uint32_t>(
-          static_cast<uint64_t>(destSampleRate) *
-          static_cast<uint64_t>(audioData->mFrames) /
-          static_cast<uint64_t>(sampleRate)
-        );
+      const uint32_t maxOutSamples = resampledFrames - mDecodeJob.mWriteIndex;
 
       for (uint32_t i = 0; i < audioData->mChannels; ++i) {
         uint32_t inSamples = audioData->mFrames;
-        uint32_t outSamples = expectedOutSamples;
+        uint32_t outSamples = maxOutSamples;
 
         WebAudioUtils::SpeexResamplerProcess(
             resampler, i, &bufferData[i * audioData->mFrames], &inSamples,
@@ -364,6 +360,7 @@ MediaDecodeTask::Decode()
         if (i == audioData->mChannels - 1) {
           mDecodeJob.mWriteIndex += outSamples;
           MOZ_ASSERT(mDecodeJob.mWriteIndex <= resampledFrames);
+          MOZ_ASSERT(inSamples == audioData->mFrames);
         }
       }
     } else {
@@ -380,11 +377,11 @@ MediaDecodeTask::Decode()
   }
 
   if (sampleRate != destSampleRate) {
-    int inputLatency = speex_resampler_get_input_latency(resampler);
-    int outputLatency = speex_resampler_get_output_latency(resampler);
+    uint32_t inputLatency = speex_resampler_get_input_latency(resampler);
+    const uint32_t maxOutSamples = resampledFrames - mDecodeJob.mWriteIndex;
     for (uint32_t i = 0; i < channelCount; ++i) {
       uint32_t inSamples = inputLatency;
-      uint32_t outSamples = outputLatency;
+      uint32_t outSamples = maxOutSamples;
 
       WebAudioUtils::SpeexResamplerProcess(
           resampler, i, (AudioDataValue*)nullptr, &inSamples,
@@ -394,6 +391,7 @@ MediaDecodeTask::Decode()
       if (i == channelCount - 1) {
         mDecodeJob.mWriteIndex += outSamples;
         MOZ_ASSERT(mDecodeJob.mWriteIndex <= resampledFrames);
+        MOZ_ASSERT(inSamples == inputLatency);
       }
     }
   }