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// Copyright (c) 2010 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/video/ffmpeg_video_allocator.h"
#include "base/logging.h"
#include "media/ffmpeg/ffmpeg_common.h"
// Because Chromium could be build with FFMPEG version other than FFMPEG-MT
// by using GYP_DEFINES variable "use-system-ffmpeg". The following code will
// not build with vanilla FFMPEG. We will fall back to "disable direct
// rendering" when that happens.
// TODO(jiesun): Actually we could do better than this: we should modify the
// following code to work with vanilla FFMPEG.
namespace media {
FFmpegVideoAllocator::FFmpegVideoAllocator()
: get_buffer_(NULL),
release_buffer_(NULL) {
}
FFmpegVideoAllocator::~FFmpegVideoAllocator() {}
void FFmpegVideoAllocator::Initialize(AVCodecContext* codec_context,
VideoFrame::Format surface_format) {
#ifdef FF_THREAD_FRAME // Only defined in FFMPEG-MT.
surface_format_ = surface_format;
get_buffer_ = codec_context->get_buffer;
release_buffer_ = codec_context->release_buffer;
codec_context->get_buffer = AllocateBuffer;
codec_context->release_buffer = ReleaseBuffer;
codec_context->opaque = this;
#endif
}
void FFmpegVideoAllocator::Stop(AVCodecContext* codec_context) {
#ifdef FF_THREAD_FRAME // Only defined in FFMPEG-MT.
// Restore default buffer allocator functions.
// This does not work actually, because in ffmpeg-mt, there are
// multiple codec_context copies per threads. each context maintain
// its own internal buffer pools.
codec_context->get_buffer = get_buffer_;
codec_context->release_buffer = release_buffer_;
while (!frame_pool_.empty()) {
RefCountedAVFrame* ffmpeg_video_frame = frame_pool_.front();
frame_pool_.pop_front();
ffmpeg_video_frame->av_frame_.opaque = NULL;
// Reset per-context default buffer release functions.
ffmpeg_video_frame->av_frame_.owner->release_buffer = release_buffer_;
ffmpeg_video_frame->av_frame_.owner->get_buffer = get_buffer_;
delete ffmpeg_video_frame;
}
for (int i = 0; i < kMaxFFmpegThreads; ++i)
available_frames_[i].clear();
codec_index_map_.clear();
#endif
}
void FFmpegVideoAllocator::DisplayDone(
AVCodecContext* codec_context,
scoped_refptr<VideoFrame> video_frame) {
#ifdef FF_THREAD_FRAME // Only defined in FFMPEG-MT.
RefCountedAVFrame* ffmpeg_video_frame =
reinterpret_cast<RefCountedAVFrame*>(video_frame->private_buffer());
if (ffmpeg_video_frame->Release() == 0) {
int index = codec_index_map_[ffmpeg_video_frame->av_frame_.owner];
available_frames_[index].push_back(ffmpeg_video_frame);
}
#endif
}
scoped_refptr<VideoFrame> FFmpegVideoAllocator::DecodeDone(
AVCodecContext* codec_context,
AVFrame* av_frame) {
scoped_refptr<VideoFrame> frame;
#ifdef FF_THREAD_FRAME // Only defined in FFMPEG-MT.
RefCountedAVFrame* ffmpeg_video_frame =
reinterpret_cast<RefCountedAVFrame*>(av_frame->opaque);
ffmpeg_video_frame->av_frame_ = *av_frame;
ffmpeg_video_frame->AddRef();
VideoFrame::CreateFrameExternal(
VideoFrame::TYPE_SYSTEM_MEMORY, surface_format_,
codec_context->width, codec_context->height, 3,
av_frame->data,
av_frame->linesize,
kNoTimestamp,
kNoTimestamp,
ffmpeg_video_frame, // |private_buffer_|.
&frame);
#endif
return frame;
}
int FFmpegVideoAllocator::AllocateBuffer(AVCodecContext* codec_context,
AVFrame* av_frame) {
FFmpegVideoAllocator* context =
reinterpret_cast<FFmpegVideoAllocator*>(codec_context->opaque);
return context->InternalAllocateBuffer(codec_context, av_frame);
}
void FFmpegVideoAllocator::ReleaseBuffer(AVCodecContext* codec_context,
AVFrame* av_frame) {
FFmpegVideoAllocator* context =
reinterpret_cast<FFmpegVideoAllocator*>(codec_context->opaque);
context->InternalReleaseBuffer(codec_context, av_frame);
}
int FFmpegVideoAllocator::InternalAllocateBuffer(
AVCodecContext* codec_context, AVFrame* av_frame) {
#ifdef FF_THREAD_FRAME // Only defined in FFMPEG-MT.
// If |codec_context| is not yet known to us, we add it to our map.
if (codec_index_map_.find(codec_context) == codec_index_map_.end()) {
int next_index = codec_index_map_.size();
codec_index_map_[codec_context] = next_index;
CHECK_LE((int)codec_index_map_.size(), kMaxFFmpegThreads);
}
int index = codec_index_map_[codec_context];
RefCountedAVFrame* ffmpeg_video_frame;
if (available_frames_[index].empty()) {
int ret = get_buffer_(codec_context, av_frame);
CHECK_EQ(ret, 0);
ffmpeg_video_frame = new RefCountedAVFrame();
ffmpeg_video_frame->av_frame_ = *av_frame;
frame_pool_.push_back(ffmpeg_video_frame);
} else {
ffmpeg_video_frame = available_frames_[index].front();
available_frames_[index].pop_front();
// We assume |get_buffer| immediately after |release_buffer| will
// not trigger real buffer allocation. We just use it to fill the
// correct value inside |pic|.
release_buffer_(codec_context, &ffmpeg_video_frame->av_frame_);
get_buffer_(codec_context, av_frame);
ffmpeg_video_frame->av_frame_ = *av_frame;
}
av_frame->opaque = ffmpeg_video_frame;
av_frame->type = FF_BUFFER_TYPE_USER;
ffmpeg_video_frame->AddRef();
#endif
return 0;
}
void FFmpegVideoAllocator::InternalReleaseBuffer(
AVCodecContext* codec_context, AVFrame* av_frame) {
#ifdef FF_THREAD_FRAME // Only defined in FFMPEG-MT.
if (av_frame->opaque == NULL) {
// This could happened in two scenario:
// 1. FFMPEG-MT H264 codec seems to allocate one frame during
// av_find_stream_info. This happens before we could even
// install the custom allocator functions.
// 2. When clean up time, we reset pic->opaque, and destruct ourselves.
// We could not use our own release_buffer function because
// handle-delayed-release() is called after we get destructed.
release_buffer_(codec_context, av_frame);
return;
}
RefCountedAVFrame* ffmpeg_video_frame =
reinterpret_cast<RefCountedAVFrame*>(av_frame->opaque);
release_buffer_(codec_context, av_frame);
// This is required for get_buffer().
ffmpeg_video_frame->av_frame_.data[0] = NULL;
get_buffer_(codec_context, &ffmpeg_video_frame->av_frame_);
int index = codec_index_map_[codec_context];
if (ffmpeg_video_frame->Release() == 0)
available_frames_[index].push_back(ffmpeg_video_frame);
for(int k = 0; k < 4; ++k)
av_frame->data[k]=NULL;
#endif
}
} // namespace media
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