Motown in-proc streaming framework used to implement media services.

services/media/framework/parts/lpcm_reformatter.cc

+// Copyright 2016 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 "base/logging.h"
+#include "services/media/framework/parts/lpcm_reformatter.h"
+
+namespace mojo {
+namespace media {
+
+LpcmReformatter* LpcmReformatter::NewImpl(
+    const LpcmStreamType& in_type,
+    const LpcmStreamTypeSet& out_type) {
+  switch (in_type.sample_format()) {
+    case LpcmStreamType::SampleFormat::kUnsigned8:
+      switch (out_type.sample_format()) {
+        case LpcmStreamType::SampleFormat::kUnsigned8:
+        case LpcmStreamType::SampleFormat::kAny:
+          return new LpcmReformatterImpl<uint8_t, uint8_t>(
+              in_type, out_type);
+        case LpcmStreamType::SampleFormat::kSigned16:
+          return new LpcmReformatterImpl<uint8_t, int16_t>(
+              in_type, out_type);
+        case LpcmStreamType::SampleFormat::kSigned24In32:
+          return new LpcmReformatterImpl<uint8_t, int32_t>(
+              in_type, out_type);
+        case LpcmStreamType::SampleFormat::kFloat:
+          return new LpcmReformatterImpl<uint8_t, float>(
+              in_type, out_type);
+        default:
+          NOTREACHED() << "unsupported sample format";
+          return nullptr;
+      }
+    case LpcmStreamType::SampleFormat::kSigned16:
+      switch (out_type.sample_format()) {
+        case LpcmStreamType::SampleFormat::kUnsigned8:
+          return new LpcmReformatterImpl<int16_t, uint8_t>(
+              in_type, out_type);
+        case LpcmStreamType::SampleFormat::kSigned16:
+        case LpcmStreamType::SampleFormat::kAny:
+          return new LpcmReformatterImpl<int16_t, int16_t>(
+              in_type, out_type);
+        case LpcmStreamType::SampleFormat::kSigned24In32:
+          return new LpcmReformatterImpl<int16_t, int32_t>(
+              in_type, out_type);
+        case LpcmStreamType::SampleFormat::kFloat:
+          return new LpcmReformatterImpl<int16_t, float>(
+              in_type, out_type);
+        default:
+          NOTREACHED() << "unsupported sample format";
+          return nullptr;
+      }
+    case LpcmStreamType::SampleFormat::kSigned24In32:
+      switch (out_type.sample_format()) {
+        case LpcmStreamType::SampleFormat::kUnsigned8:
+          return new LpcmReformatterImpl<int32_t, uint8_t>(
+              in_type, out_type);
+        case LpcmStreamType::SampleFormat::kSigned16:
+          return new LpcmReformatterImpl<int32_t, int16_t>(
+              in_type, out_type);
+        case LpcmStreamType::SampleFormat::kSigned24In32:
+        case LpcmStreamType::SampleFormat::kAny:
+          return new LpcmReformatterImpl<int32_t, int32_t>(
+              in_type, out_type);
+        case LpcmStreamType::SampleFormat::kFloat:
+          return new LpcmReformatterImpl<int32_t, float>(
+              in_type, out_type);
+        default:
+          NOTREACHED() << "unsupported sample format";
+          return nullptr;
+      }
+    case LpcmStreamType::SampleFormat::kFloat:
+      switch (out_type.sample_format()) {
+        case LpcmStreamType::SampleFormat::kUnsigned8:
+          return new LpcmReformatterImpl<float, uint8_t>(
+              in_type, out_type);
+        case LpcmStreamType::SampleFormat::kSigned16:
+          return new LpcmReformatterImpl<float, int16_t>(
+              in_type, out_type);
+        case LpcmStreamType::SampleFormat::kSigned24In32:
+          return new LpcmReformatterImpl<float, int32_t>(
+              in_type, out_type);
+        case LpcmStreamType::SampleFormat::kFloat:
+        case LpcmStreamType::SampleFormat::kAny:
+          return new LpcmReformatterImpl<float, float>(in_type, out_type);
+        default:
+          NOTREACHED() << "unsupported sample format";
+          return nullptr;
+      }
+    default:
+      NOTREACHED() << "unsupported sample format";
+      return nullptr;
+  }
+}
+
+template<typename TIn, typename TOut>
+LpcmReformatterImpl<TIn, TOut>::LpcmReformatterImpl(
+    const LpcmStreamType& in_type,
+    const LpcmStreamTypeSet& out_type) :
+    in_type_(in_type),
+    out_type_(
+        out_type.sample_format() == LpcmStreamType::SampleFormat::kAny ?
+            in_type.sample_format() :
+            out_type.sample_format(),
+        in_type.channels(),
+        in_type.frames_per_second()) {}
+
+template<typename TIn, typename TOut>
+LpcmReformatterImpl<TIn, TOut>::~LpcmReformatterImpl() {}
+
+namespace {
+
+template<typename TIn, typename TOut>
+inline void CopySample(TOut* dest, TIn* source) {
+  *dest = static_cast<TOut>(*source);
+}
+
+inline void CopySample(uint8_t* dest, int16_t* source) {
+  *dest = static_cast<uint8_t>((*source >> 8) ^ 0x80);
+}
+
+inline void CopySample(uint8_t* dest, int32_t* source) {
+  *dest = static_cast<uint8_t>((*source >> 16) ^ 0x80); // TODO(dalesat): Limit?
+}
+
+inline void CopySample(uint8_t* dest, float* source) {
+  *dest = static_cast<uint8_t>((*source * 0x7f) + 128); // TODO(dalesat): Limit?
+}
+
+inline void CopySample(int16_t* dest, uint8_t* source) {
+  *dest = static_cast<int16_t>(*source ^ 0x80) << 8;
+}
+
+inline void CopySample(int16_t* dest, int32_t* source) {
+  *dest = static_cast<int16_t>(*source >> 8); // TODO(dalesat): Limit?
+}
+
+inline void CopySample(int16_t* dest, float* source) {
+  *dest = static_cast<int16_t>(*source * 0x7fff); // TODO(dalesat): Limit?
+}
+
+inline void CopySample(int32_t* dest, uint8_t* source) {
+  *dest = static_cast<int32_t>(*source ^ 0x80) << 16;
+}
+
+inline void CopySample(int32_t* dest, int16_t* source) {
+  *dest = static_cast<int32_t>(*source << 8);
+}
+
+inline void CopySample(int32_t* dest, float* source) {
+  *dest = static_cast<int32_t>(*source * 0x7fffff); // TODO(dalesat): Limit?
+}
+
+inline void CopySample(float* dest, uint8_t* source) {
+  *dest = static_cast<float>(*source ^ 0x80) / 0x80;
+}
+
+inline void CopySample(float* dest, int16_t* source) {
+  *dest = static_cast<float>(*source) / 0x8000;
+}
+
+inline void CopySample(float* dest, int32_t* source) {
+  *dest = static_cast<float>(*source) / 0x800000;
+}
+
+} // namespace
+
+template<typename TIn, typename TOut>
+LpcmStreamType& LpcmReformatterImpl<TIn, TOut>::input_stream_type() {
+  return in_type_;
+}
+
+template<typename TIn, typename TOut>
+LpcmStreamType& LpcmReformatterImpl<TIn, TOut>::output_stream_type() {
+  return out_type_;
+}
+
+template<typename TIn, typename TOut>
+void LpcmReformatterImpl<TIn, TOut>::TransformFrames(
+    LpcmFrames& source,
+    LpcmFrames& dest,
+    bool mix) {
+  DCHECK(source.buffer_);
+  DCHECK(source.frame_count_);
+  DCHECK(dest.buffer_);
+  DCHECK(dest.frame_count_);
+
+  uint64_t frame_count = std::min(source.frame_count_, dest.frame_count_);
+
+  uint8_t* in_channel = reinterpret_cast<uint8_t*>(source.buffer_);
+  uint8_t* out_channel = reinterpret_cast<uint8_t*>(dest.buffer_);
+
+  for (uint32_t channel = 0; channel < in_type_.channels(); channel++) {
+    TIn* in_sample = reinterpret_cast<TIn*>(in_channel);
+    TOut* out_sample = reinterpret_cast<TOut*>(out_channel);
+    for (uint64_t sample = 0; sample < frame_count; sample++) {
+      CopySample(out_sample, in_sample);
+      in_sample += in_type_.channels();
+      out_sample += out_type_.channels();
+    }
+    in_channel += in_type_.sample_size();
+    out_channel += out_type_.sample_size();
+  }
+
+  source.advance(frame_count);
+  dest.advance(frame_count);
+}
+
+}  // namespace media
+}  // namespace mojo