Motown: New wrapper classes for ffmpeg format context and io context

services/media/framework_ffmpeg/ffmpeg_io.cc

Index: services/media/framework_ffmpeg/ffmpeg_io.cc
diff --git a/services/media/framework_ffmpeg/ffmpeg_io.cc b/services/media/framework_ffmpeg/ffmpeg_io.cc
deleted file mode 100644
index c15c614d8511bc8cecf7a2d2fd67ee2b62535990..0000000000000000000000000000000000000000
--- a/services/media/framework_ffmpeg/ffmpeg_io.cc
+++ /dev/null
@@ -1,99 +0,0 @@
-// 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/reader.h"
-#include "services/media/framework_ffmpeg/ffmpeg_init.h"
-#include "services/media/framework_ffmpeg/ffmpeg_io.h"
-extern "C" {
-#include "third_party/ffmpeg/libavformat/avio.h"
-}
-
-namespace mojo {
-namespace media {
-
-static int AvioRead(void* opaque, uint8_t* buf, int buf_size);
-static int64_t AvioSeek(void* opaque, int64_t offset, int whence);
-
-AvioContextPtr CreateAvioContext(Reader* reader) {
-  // Internal buffer size used by AVIO for reading.
-  const int kBufferSize = 32 * 1024;
-
-  InitFfmpeg();
-
-  AVIOContext* result = avio_alloc_context(
-      static_cast<unsigned char*>(av_malloc(kBufferSize)),
-      kBufferSize,
-      0, // write_flag
-      reader, // opaque
-      &AvioRead,
-      nullptr,
-      &AvioSeek);
-
-  // Ensure FFmpeg only tries to seek when we know how.
-  result->seekable = reader->CanSeek() ? AVIO_SEEKABLE_NORMAL : 0;
-
-  // Ensure writing is disabled.
-  result->write_flag = 0;
-
-  return AvioContextPtr(result);
-}
-
-// Performs a read operation using the signature required for avio.
-static int AvioRead(void* opaque, uint8_t* buf, int buf_size) {
-  Reader* reader = reinterpret_cast<Reader*>(opaque);
-  int result = reader->Read(buf, buf_size);
-  if (result < 0) {
-    result = AVERROR(EIO);
-  }
-  return result;
-}
-
-// Performs a seek operation using the signature required for avio.
-static int64_t AvioSeek(void* opaque, int64_t offset, int whence) {
-  Reader* reader = reinterpret_cast<Reader*>(opaque);
-
-  if (whence == AVSEEK_SIZE) {
-    int64_t result = reader->GetSize();
-    if (result == -1) {
-      return AVERROR(EIO);
-    }
-    return result;
-  }
-
-  int64_t base;
-  switch (whence) {
-    case SEEK_SET:
-      base = 0;
-      break;
-
-    case SEEK_CUR:
-      base = reader->GetPosition();
-      if (base == -1) {
-        return AVERROR(EIO);
-      }
-      break;
-
-    case SEEK_END:
-      base = reader->GetSize();
-      if (base == -1) {
-        return AVERROR(EIO);
-      }
-      break;
-
-    default:
-      NOTREACHED();
-      return AVERROR(EIO);
-  }
-
-  int64_t result = reader->SetPosition(base + offset);
-  if (result == -1) {
-    return AVERROR(EIO);
-  }
-
-  return result;
-}
-
-} // namespace media
-} // namespace mojo