Add CDM video decoder.

webkit/media/crypto/decoders/ffmpeg_video_decoder.cc

Index: webkit/media/crypto/decoders/ffmpeg_video_decoder.cc
diff --git a/webkit/media/crypto/decoders/ffmpeg_video_decoder.cc b/webkit/media/crypto/decoders/ffmpeg_video_decoder.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d16976b61b8ce97807b45bb40ee3bdc8e261455a
--- /dev/null
+++ b/webkit/media/crypto/decoders/ffmpeg_video_decoder.cc
@@ -0,0 +1,127 @@
+// 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 "base/logging.h"
+#include "base/memory/ref_counted.h"
+#include "media/base/limits.h"
+#include "media/ffmpeg/ffmpeg_common.h"
+#include "webkit/media/crypto/decoders/ffmpeg_util.h"
+#include "webkit/media/crypto/decoders/ffmpeg_video_decoder.h"
+#include "webkit/media/crypto/ppapi/content_decryption_module.h"
+
+namespace webkit_media {
+
+using cdm::VideoDecoderConfig;
+using cdm::VideoFrame;
+
+static int GetVideoBufferImpl(AVCodecContext* s, AVFrame* frame) {
+  FFmpegVideoDecoder* vd = static_cast<FFmpegVideoDecoder*>(s->opaque);
+  return vd->GetVideoBuffer(s, frame);
+}
+
+static void ReleaseVideoBufferImpl(AVCodecContext* s, AVFrame* frame) {
+  scoped_refptr<VideoFrame> video_frame;
+  video_frame.swap(reinterpret_cast<VideoFrame**>(&frame->opaque));
+
+  // The FFmpeg API expects us to zero the data pointers in
+  // this callback
+  memset(frame->data, 0, sizeof(frame->data));
+  frame->opaque = NULL;
+}
+
+FFmpegVideoDecoder::FFmpegVideoDecoder()
+    : codec_context_(NULL),
+      av_frame_(NULL) {
+}
+
+FFmpegVideoDecoder::~FFmpegVideoDecoder() {
+}
+
+bool FFmpegVideoDecoder::Initialize(const VideoDecoderConfig& config) {
+  return false;
+}
+
+bool FFmpegVideoDecoder::DecodeFrame(const VideoFrame& compressed_frame,
+                                     VideoFrame* decompressed_frame) {
+  return false;
+}
+
+int FFmpegVideoDecoder::GetVideoBuffer(AVCodecContext* codec_context,
+                                       AVFrame* frame) {
+  // Don't use |codec_context_| here! With threaded decoding,
+  // it will contain unsynchronized width/height/pix_fmt values,
+  // whereas |codec_context| contains the current threads's
+  // updated width/height/pix_fmt, which can change for adaptive
+  // content.
+  VideoFrame::Format format = PixelFormatToVideoFormat(codec_context->pix_fmt);
+  if (format == VideoFrame::INVALID)
+    return AVERROR(EINVAL);
+  DCHECK(format == VideoFrame::YV12 || format == VideoFrame::YV16);
+
+  gfx::Size size(codec_context->width, codec_context->height);
+  int ret;
+  if ((ret = av_image_check_size(size.width(), size.height(), 0, NULL)) < 0)
+    return ret;
+
+  gfx::Size natural_size;
+  if (codec_context->sample_aspect_ratio.num > 0) {
+    natural_size = GetNaturalSize(size,
+                                  codec_context->sample_aspect_ratio.num,
+                                  codec_context->sample_aspect_ratio.den);
+  } else {
+    natural_size = demuxer_stream_->video_decoder_config().natural_size();
+  }
+
+  if (!VideoFrame::IsValidConfig(format, size, natural_size))
+    return AVERROR(EINVAL);
+
+  scoped_refptr<VideoFrame> video_frame =
+      VideoFrame::CreateFrame(format, size, natural_size, kNoTimestamp());
+
+  for (int i = 0; i < 3; i++) {
+    frame->base[i] = video_frame->data(i);
+    frame->data[i] = video_frame->data(i);
+    frame->linesize[i] = video_frame->stride(i);
+  }
+
+  frame->opaque = NULL;
+  video_frame.swap(reinterpret_cast<VideoFrame**>(&frame->opaque));
+  frame->type = FF_BUFFER_TYPE_USER;
+  frame->pkt_pts = codec_context->pkt ? codec_context->pkt->pts :
+                                        AV_NOPTS_VALUE;
+  frame->width = codec_context->width;
+  frame->height = codec_context->height;
+  frame->format = codec_context->pix_fmt;
+
+  return 0;
+}
+
+// static
+bool VideoFrame::IsValidConfig(VideoFrame::Format format,
+                               const Size& data_size) {
+  return (format != VideoFrame::INVALID &&
+          data_size.width() > 0 && data_size.height() > 0 &&
+          data_size.width() <= limits::kMaxDimension &&
+          data_size.height() <= limits::kMaxDimension &&
+          data_size.width() * data_size.height() <= limits::kMaxCanvas &&
+          natural_size.width() > 0 && natural_size.height() > 0 &&
+          natural_size.width() <= limits::kMaxDimension &&
+          natural_size.height() <= limits::kMaxDimension &&
+          natural_size.width() * natural_size.height() <= limits::kMaxCanvas);
+}
+
+void FFmpegVideoDecoder::ReleaseFFmpegResources() {
+  if (codec_context_) {
+    av_free(codec_context_->extradata);
+    avcodec_close(codec_context_);
+    av_free(codec_context_);
+    codec_context_ = NULL;
+  }
+  if (av_frame_) {
+    av_free(av_frame_);
+    av_frame_ = NULL;
+  }
+}
+
+}  // namespace webkit_media