// Copyright 2014 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.
// Note: ported from Chromium commit head: 91175b1
// Note: image processor is not ported.
#include "v4l2_video_decode_accelerator.h"
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/videodev2.h>
#include <poll.h>
#include <string.h>
#include <sys/eventfd.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include "base/bind.h"
#include "base/command_line.h"
#include "base/message_loop/message_loop.h"
#include "base/numerics/safe_conversions.h"
#include "base/posix/eintr_wrapper.h"
#include "base/single_thread_task_runner.h"
#include "base/memory/ptr_util.h"
#include "base/threading/thread_task_runner_handle.h"
#include "build/build_config.h"
#include "h264_parser.h"
#include "rect.h"
#include "shared_memory_region.h"
#define DVLOGF(level) DVLOG(level) << __func__ << "(): "
#define VLOGF(level) VLOG(level) << __func__ << "(): "
#define VPLOGF(level) VPLOG(level) << __func__ << "(): "
#define NOTIFY_ERROR(x) \
do { \
VLOGF(1) << "Setting error state:" << x; \
SetErrorState(x); \
} while (0)
#define IOCTL_OR_ERROR_RETURN_VALUE(type, arg, value, type_str) \
do { \
if (device_->Ioctl(type, arg) != 0) { \
VPLOGF(1) << "ioctl() failed: " << type_str; \
NOTIFY_ERROR(PLATFORM_FAILURE); \
return value; \
} \
} while (0)
#define IOCTL_OR_ERROR_RETURN(type, arg) \
IOCTL_OR_ERROR_RETURN_VALUE(type, arg, ((void)0), #type)
#define IOCTL_OR_ERROR_RETURN_FALSE(type, arg) \
IOCTL_OR_ERROR_RETURN_VALUE(type, arg, false, #type)
#define IOCTL_OR_LOG_ERROR(type, arg) \
do { \
if (device_->Ioctl(type, arg) != 0) \
VPLOGF(1) << "ioctl() failed: " << #type; \
} while (0)
namespace media {
// static
const uint32_t V4L2VideoDecodeAccelerator::supported_input_fourccs_[] = {
V4L2_PIX_FMT_H264, V4L2_PIX_FMT_VP8, V4L2_PIX_FMT_VP9,
};
struct V4L2VideoDecodeAccelerator::BitstreamBufferRef {
BitstreamBufferRef(
base::WeakPtr<Client>& client,
scoped_refptr<base::SingleThreadTaskRunner>& client_task_runner,
std::unique_ptr<SharedMemoryRegion> shm,
int32_t input_id);
~BitstreamBufferRef();
const base::WeakPtr<Client> client;
const scoped_refptr<base::SingleThreadTaskRunner> client_task_runner;
const std::unique_ptr<SharedMemoryRegion> shm;
size_t bytes_used;
const int32_t input_id;
};
V4L2VideoDecodeAccelerator::BitstreamBufferRef::BitstreamBufferRef(
base::WeakPtr<Client>& client,
scoped_refptr<base::SingleThreadTaskRunner>& client_task_runner,
std::unique_ptr<SharedMemoryRegion> shm,
int32_t input_id)
: client(client),
client_task_runner(client_task_runner),
shm(std::move(shm)),
bytes_used(0),
input_id(input_id) {}
V4L2VideoDecodeAccelerator::BitstreamBufferRef::~BitstreamBufferRef() {
if (input_id >= 0) {
client_task_runner->PostTask(
FROM_HERE,
base::Bind(&Client::NotifyEndOfBitstreamBuffer, client, input_id));
}
}
V4L2VideoDecodeAccelerator::InputRecord::InputRecord()
: at_device(false), address(NULL), length(0), bytes_used(0), input_id(-1) {}
V4L2VideoDecodeAccelerator::InputRecord::~InputRecord() {}
V4L2VideoDecodeAccelerator::OutputRecord::OutputRecord()
: state(kFree),
picture_id(-1),
cleared(false) {}
V4L2VideoDecodeAccelerator::OutputRecord::~OutputRecord() {}
V4L2VideoDecodeAccelerator::PictureRecord::PictureRecord(bool cleared,
const Picture& picture)
: cleared(cleared), picture(picture) {}
V4L2VideoDecodeAccelerator::PictureRecord::~PictureRecord() {}
V4L2VideoDecodeAccelerator::V4L2VideoDecodeAccelerator(
const scoped_refptr<V4L2Device>& device)
: child_task_runner_(base::ThreadTaskRunnerHandle::Get()),
decoder_thread_("V4L2DecoderThread"),
decoder_state_(kUninitialized),
output_mode_(Config::OutputMode::ALLOCATE),
device_(device),
decoder_delay_bitstream_buffer_id_(-1),
decoder_current_input_buffer_(-1),
decoder_decode_buffer_tasks_scheduled_(0),
decoder_frames_at_client_(0),
decoder_flushing_(false),
decoder_cmd_supported_(false),
flush_awaiting_last_output_buffer_(false),
reset_pending_(false),
decoder_partial_frame_pending_(false),
input_streamon_(false),
input_buffer_queued_count_(0),
output_streamon_(false),
output_buffer_queued_count_(0),
output_dpb_size_(0),
output_planes_count_(0),
picture_clearing_count_(0),
device_poll_thread_("V4L2DevicePollThread"),
video_profile_(VIDEO_CODEC_PROFILE_UNKNOWN),
input_format_fourcc_(0),
output_format_fourcc_(0),
weak_this_factory_(this) {
weak_this_ = weak_this_factory_.GetWeakPtr();
}
V4L2VideoDecodeAccelerator::~V4L2VideoDecodeAccelerator() {
DCHECK(!decoder_thread_.IsRunning());
DCHECK(!device_poll_thread_.IsRunning());
DVLOGF(2);
// These maps have members that should be manually destroyed, e.g. file
// descriptors, mmap() segments, etc.
DCHECK(input_buffer_map_.empty());
DCHECK(output_buffer_map_.empty());
}
bool V4L2VideoDecodeAccelerator::Initialize(const Config& config,
Client* client) {
VLOGF(2) << "profile: " << config.profile
<< ", output_mode=" << static_cast<int>(config.output_mode);
DCHECK(child_task_runner_->BelongsToCurrentThread());
DCHECK_EQ(decoder_state_, kUninitialized);
if (config.output_mode != Config::OutputMode::IMPORT) {
NOTREACHED() << "Only IMPORT OutputModes are supported";
return false;
}
client_ptr_factory_.reset(new base::WeakPtrFactory<Client>(client));
client_ = client_ptr_factory_->GetWeakPtr();
// If we haven't been set up to decode on separate thread via
// TryToSetupDecodeOnSeparateThread(), use the main thread/client for
// decode tasks.
if (!decode_task_runner_) {
decode_task_runner_ = child_task_runner_;
DCHECK(!decode_client_);
decode_client_ = client_;
}
video_profile_ = config.profile;
input_format_fourcc_ =
V4L2Device::VideoCodecProfileToV4L2PixFmt(video_profile_);
if (!device_->Open(V4L2Device::Type::kDecoder, input_format_fourcc_)) {
VLOGF(1) << "Failed to open device for profile: " << config.profile
<< " fourcc: " << std::hex << "0x" << input_format_fourcc_;
return false;
}
// Capabilities check.
struct v4l2_capability caps;
const __u32 kCapsRequired = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_QUERYCAP, &caps);
if ((caps.capabilities & kCapsRequired) != kCapsRequired) {
VLOGF(1) << "ioctl() failed: VIDIOC_QUERYCAP"
<< ", caps check failed: 0x" << std::hex << caps.capabilities;
return false;
}
if (!SetupFormats())
return false;
if (video_profile_ >= H264PROFILE_MIN && video_profile_ <= H264PROFILE_MAX) {
decoder_h264_parser_.reset(new H264Parser());
}
if (!decoder_thread_.Start()) {
VLOGF(1) << "decoder thread failed to start";
return false;
}
decoder_state_ = kInitialized;
output_mode_ = config.output_mode;
// InitializeTask will NOTIFY_ERROR on failure.
decoder_thread_.task_runner()->PostTask(
FROM_HERE, base::Bind(&V4L2VideoDecodeAccelerator::InitializeTask,
base::Unretained(this)));
return true;
}
void V4L2VideoDecodeAccelerator::InitializeTask() {
VLOGF(2);
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_EQ(decoder_state_, kInitialized);
// Subscribe to the resolution change event.
struct v4l2_event_subscription sub;
memset(&sub, 0, sizeof(sub));
sub.type = V4L2_EVENT_SOURCE_CHANGE;
IOCTL_OR_ERROR_RETURN(VIDIOC_SUBSCRIBE_EVENT, &sub);
if (!CreateInputBuffers()) {
NOTIFY_ERROR(PLATFORM_FAILURE);
return;
}
decoder_cmd_supported_ = IsDecoderCmdSupported();
if (!StartDevicePoll())
return;
}
void V4L2VideoDecodeAccelerator::Decode(
const BitstreamBuffer& bitstream_buffer) {
DVLOGF(4) << "input_id=" << bitstream_buffer.id()
<< ", size=" << bitstream_buffer.size();
DCHECK(decode_task_runner_->BelongsToCurrentThread());
if (bitstream_buffer.id() < 0) {
VLOGF(1) << "Invalid bitstream_buffer, id: " << bitstream_buffer.id();
if (base::SharedMemory::IsHandleValid(bitstream_buffer.handle()))
base::SharedMemory::CloseHandle(bitstream_buffer.handle());
NOTIFY_ERROR(INVALID_ARGUMENT);
return;
}
// DecodeTask() will take care of running a DecodeBufferTask().
decoder_thread_.task_runner()->PostTask(
FROM_HERE, base::Bind(&V4L2VideoDecodeAccelerator::DecodeTask,
base::Unretained(this), bitstream_buffer));
}
void V4L2VideoDecodeAccelerator::AssignPictureBuffers(
const std::vector<PictureBuffer>& buffers) {
VLOGF(2) << "buffer_count=" << buffers.size();
DCHECK(child_task_runner_->BelongsToCurrentThread());
decoder_thread_.task_runner()->PostTask(
FROM_HERE,
base::Bind(&V4L2VideoDecodeAccelerator::AssignPictureBuffersTask,
base::Unretained(this), buffers));
}
void V4L2VideoDecodeAccelerator::AssignPictureBuffersTask(
const std::vector<PictureBuffer>& buffers) {
VLOGF(2);
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_EQ(decoder_state_, kAwaitingPictureBuffers);
uint32_t req_buffer_count = output_dpb_size_ + kDpbOutputBufferExtraCount;
if (buffers.size() < req_buffer_count) {
VLOGF(1) << "Failed to provide requested picture buffers. (Got "
<< buffers.size() << ", requested " << req_buffer_count << ")";
NOTIFY_ERROR(INVALID_ARGUMENT);
return;
}
// Allocate the output buffers.
struct v4l2_requestbuffers reqbufs;
memset(&reqbufs, 0, sizeof(reqbufs));
reqbufs.count = buffers.size();
reqbufs.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
reqbufs.memory = V4L2_MEMORY_MMAP;
IOCTL_OR_ERROR_RETURN(VIDIOC_REQBUFS, &reqbufs);
if (reqbufs.count != buffers.size()) {
VLOGF(1) << "Could not allocate enough output buffers";
NOTIFY_ERROR(PLATFORM_FAILURE);
return;
}
DCHECK(free_output_buffers_.empty());
DCHECK(output_buffer_map_.empty());
output_buffer_map_.resize(buffers.size());
// Always use IMPORT output mode for Android solution.
DCHECK_EQ(output_mode_, Config::OutputMode::IMPORT);
for (size_t i = 0; i < output_buffer_map_.size(); ++i) {
OutputRecord& output_record = output_buffer_map_[i];
DCHECK_EQ(output_record.state, kFree);
DCHECK_EQ(output_record.picture_id, -1);
DCHECK_EQ(output_record.cleared, false);
output_record.picture_id = buffers[i].id();
// This will remain kAtClient until ImportBufferForPicture is called, either
// by the client, or by ourselves, if we are allocating.
output_record.state = kAtClient;
DVLOGF(3) << "buffer[" << i << "]: picture_id=" << output_record.picture_id;
}
}
void V4L2VideoDecodeAccelerator::ImportBufferForPicture(
int32_t picture_buffer_id,
VideoPixelFormat pixel_format,
const NativePixmapHandle& native_pixmap_handle) {
DVLOGF(3) << "picture_buffer_id=" << picture_buffer_id;
DCHECK(child_task_runner_->BelongsToCurrentThread());
if (output_mode_ != Config::OutputMode::IMPORT) {
VLOGF(1) << "Cannot import in non-import mode";
NOTIFY_ERROR(INVALID_ARGUMENT);
return;
}
if (pixel_format !=
V4L2Device::V4L2PixFmtToVideoPixelFormat(output_format_fourcc_)) {
VLOGF(1) << "Unsupported import format: " << pixel_format;
NOTIFY_ERROR(INVALID_ARGUMENT);
return;
}
std::vector<base::ScopedFD> dmabuf_fds;
for (const auto& fd : native_pixmap_handle.fds) {
DCHECK_NE(fd.fd, -1);
dmabuf_fds.push_back(base::ScopedFD(fd.fd));
}
decoder_thread_.task_runner()->PostTask(
FROM_HERE,
base::Bind(&V4L2VideoDecodeAccelerator::ImportBufferForPictureTask,
base::Unretained(this), picture_buffer_id,
base::Passed(&dmabuf_fds)));
}
void V4L2VideoDecodeAccelerator::ImportBufferForPictureTask(
int32_t picture_buffer_id,
std::vector<base::ScopedFD> dmabuf_fds) {
DVLOGF(3) << "picture_buffer_id=" << picture_buffer_id
<< ", dmabuf_fds.size()=" << dmabuf_fds.size();
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
const auto iter =
std::find_if(output_buffer_map_.begin(), output_buffer_map_.end(),
[picture_buffer_id](const OutputRecord& output_record) {
return output_record.picture_id == picture_buffer_id;
});
if (iter == output_buffer_map_.end()) {
// It's possible that we've already posted a DismissPictureBuffer for this
// picture, but it has not yet executed when this ImportBufferForPicture was
// posted to us by the client. In that case just ignore this (we've already
// dismissed it and accounted for that).
DVLOGF(3) << "got picture id=" << picture_buffer_id
<< " not in use (anymore?).";
return;
}
if (iter->state != kAtClient) {
VLOGF(1) << "Cannot import buffer not owned by client";
NOTIFY_ERROR(INVALID_ARGUMENT);
return;
}
size_t index = iter - output_buffer_map_.begin();
DCHECK_EQ(std::count(free_output_buffers_.begin(), free_output_buffers_.end(),
index),
0);
iter->state = kFree;
DCHECK_EQ(output_planes_count_, dmabuf_fds.size());
iter->processor_output_fds.swap(dmabuf_fds);
free_output_buffers_.push_back(index);
if (decoder_state_ != kChangingResolution) {
Enqueue();
ScheduleDecodeBufferTaskIfNeeded();
}
}
void V4L2VideoDecodeAccelerator::ReusePictureBuffer(int32_t picture_buffer_id) {
DVLOGF(4) << "picture_buffer_id=" << picture_buffer_id;
// Must be run on child thread, as we'll insert a sync in the EGL context.
DCHECK(child_task_runner_->BelongsToCurrentThread());
decoder_thread_.task_runner()->PostTask(
FROM_HERE, base::Bind(&V4L2VideoDecodeAccelerator::ReusePictureBufferTask,
base::Unretained(this), picture_buffer_id));
}
void V4L2VideoDecodeAccelerator::Flush() {
VLOGF(2);
DCHECK(child_task_runner_->BelongsToCurrentThread());
decoder_thread_.task_runner()->PostTask(
FROM_HERE, base::Bind(&V4L2VideoDecodeAccelerator::FlushTask,
base::Unretained(this)));
}
void V4L2VideoDecodeAccelerator::Reset() {
VLOGF(2);
DCHECK(child_task_runner_->BelongsToCurrentThread());
decoder_thread_.task_runner()->PostTask(
FROM_HERE, base::Bind(&V4L2VideoDecodeAccelerator::ResetTask,
base::Unretained(this)));
}
void V4L2VideoDecodeAccelerator::Destroy() {
VLOGF(2);
DCHECK(child_task_runner_->BelongsToCurrentThread());
// We're destroying; cancel all callbacks.
client_ptr_factory_.reset();
weak_this_factory_.InvalidateWeakPtrs();
// If the decoder thread is running, destroy using posted task.
if (decoder_thread_.IsRunning()) {
decoder_thread_.task_runner()->PostTask(
FROM_HERE, base::Bind(&V4L2VideoDecodeAccelerator::DestroyTask,
base::Unretained(this)));
// DestroyTask() will cause the decoder_thread_ to flush all tasks.
decoder_thread_.Stop();
} else {
// Otherwise, call the destroy task directly.
DestroyTask();
}
delete this;
VLOGF(2) << "Destroyed.";
}
bool V4L2VideoDecodeAccelerator::TryToSetupDecodeOnSeparateThread(
const base::WeakPtr<Client>& decode_client,
const scoped_refptr<base::SingleThreadTaskRunner>& decode_task_runner) {
VLOGF(2);
decode_client_ = decode_client;
decode_task_runner_ = decode_task_runner;
return true;
}
// static
VideoDecodeAccelerator::SupportedProfiles
V4L2VideoDecodeAccelerator::GetSupportedProfiles() {
scoped_refptr<V4L2Device> device(new V4L2Device());
if (!device)
return SupportedProfiles();
return device->GetSupportedDecodeProfiles(arraysize(supported_input_fourccs_),
supported_input_fourccs_);
}
void V4L2VideoDecodeAccelerator::DecodeTask(
const BitstreamBuffer& bitstream_buffer) {
DVLOGF(4) << "input_id=" << bitstream_buffer.id();
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_NE(decoder_state_, kUninitialized);
std::unique_ptr<BitstreamBufferRef> bitstream_record(new BitstreamBufferRef(
decode_client_, decode_task_runner_,
std::unique_ptr<SharedMemoryRegion>(
new SharedMemoryRegion(bitstream_buffer, true)),
bitstream_buffer.id()));
// Skip empty buffer.
if (bitstream_buffer.size() == 0)
return;
if (!bitstream_record->shm->Map()) {
VLOGF(1) << "could not map bitstream_buffer";
NOTIFY_ERROR(UNREADABLE_INPUT);
return;
}
DVLOGF(4) << "mapped at=" << bitstream_record->shm->memory();
if (decoder_state_ == kResetting || decoder_flushing_) {
// In the case that we're resetting or flushing, we need to delay decoding
// the BitstreamBuffers that come after the Reset() or Flush() call. When
// we're here, we know that this DecodeTask() was scheduled by a Decode()
// call that came after (in the client thread) the Reset() or Flush() call;
// thus set up the delay if necessary.
if (decoder_delay_bitstream_buffer_id_ == -1)
decoder_delay_bitstream_buffer_id_ = bitstream_record->input_id;
} else if (decoder_state_ == kError) {
VLOGF(2) << "early out: kError state";
return;
}
decoder_input_queue_.push(
linked_ptr<BitstreamBufferRef>(bitstream_record.release()));
decoder_decode_buffer_tasks_scheduled_++;
DecodeBufferTask();
}
void V4L2VideoDecodeAccelerator::DecodeBufferTask() {
DVLOGF(4);
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_NE(decoder_state_, kUninitialized);
decoder_decode_buffer_tasks_scheduled_--;
if (decoder_state_ != kInitialized && decoder_state_ != kDecoding) {
DVLOGF(3) << "early out: state=" << decoder_state_;
return;
}
if (decoder_current_bitstream_buffer_ == NULL) {
if (decoder_input_queue_.empty()) {
// We're waiting for a new buffer -- exit without scheduling a new task.
return;
}
linked_ptr<BitstreamBufferRef>& buffer_ref = decoder_input_queue_.front();
if (decoder_delay_bitstream_buffer_id_ == buffer_ref->input_id) {
// We're asked to delay decoding on this and subsequent buffers.
return;
}
// Setup to use the next buffer.
decoder_current_bitstream_buffer_.reset(buffer_ref.release());
decoder_input_queue_.pop();
const auto& shm = decoder_current_bitstream_buffer_->shm;
if (shm) {
DVLOGF(4) << "reading input_id="
<< decoder_current_bitstream_buffer_->input_id
<< ", addr=" << shm->memory() << ", size=" << shm->size();
} else {
DCHECK_EQ(decoder_current_bitstream_buffer_->input_id, kFlushBufferId);
DVLOGF(4) << "reading input_id=kFlushBufferId";
}
}
bool schedule_task = false;
size_t decoded_size = 0;
const auto& shm = decoder_current_bitstream_buffer_->shm;
if (!shm) {
// This is a dummy buffer, queued to flush the pipe. Flush.
DCHECK_EQ(decoder_current_bitstream_buffer_->input_id, kFlushBufferId);
// Enqueue a buffer guaranteed to be empty. To do that, we flush the
// current input, enqueue no data to the next frame, then flush that down.
schedule_task = true;
if (decoder_current_input_buffer_ != -1 &&
input_buffer_map_[decoder_current_input_buffer_].input_id !=
kFlushBufferId)
schedule_task = FlushInputFrame();
if (schedule_task && AppendToInputFrame(NULL, 0) && FlushInputFrame()) {
VLOGF(2) << "enqueued flush buffer";
decoder_partial_frame_pending_ = false;
schedule_task = true;
} else {
// If we failed to enqueue the empty buffer (due to pipeline
// backpressure), don't advance the bitstream buffer queue, and don't
// schedule the next task. This bitstream buffer queue entry will get
// reprocessed when the pipeline frees up.
schedule_task = false;
}
} else if (shm->size() == 0) {
// This is a buffer queued from the client that has zero size. Skip.
schedule_task = true;
} else {
// This is a buffer queued from the client, with actual contents. Decode.
const uint8_t* const data =
reinterpret_cast<const uint8_t*>(shm->memory()) +
decoder_current_bitstream_buffer_->bytes_used;
const size_t data_size =
shm->size() - decoder_current_bitstream_buffer_->bytes_used;
if (!AdvanceFrameFragment(data, data_size, &decoded_size)) {
NOTIFY_ERROR(UNREADABLE_INPUT);
return;
}
// AdvanceFrameFragment should not return a size larger than the buffer
// size, even on invalid data.
CHECK_LE(decoded_size, data_size);
switch (decoder_state_) {
case kInitialized:
schedule_task = DecodeBufferInitial(data, decoded_size, &decoded_size);
break;
case kDecoding:
schedule_task = DecodeBufferContinue(data, decoded_size);
break;
default:
NOTIFY_ERROR(ILLEGAL_STATE);
return;
}
}
if (decoder_state_ == kError) {
// Failed during decode.
return;
}
if (schedule_task) {
decoder_current_bitstream_buffer_->bytes_used += decoded_size;
if ((shm ? shm->size() : 0) ==
decoder_current_bitstream_buffer_->bytes_used) {
// Our current bitstream buffer is done; return it.
int32_t input_id = decoder_current_bitstream_buffer_->input_id;
DVLOGF(4) << "finished input_id=" << input_id;
// BitstreamBufferRef destructor calls NotifyEndOfBitstreamBuffer().
decoder_current_bitstream_buffer_.reset();
}
ScheduleDecodeBufferTaskIfNeeded();
}
}
bool V4L2VideoDecodeAccelerator::AdvanceFrameFragment(const uint8_t* data,
size_t size,
size_t* endpos) {
if (video_profile_ >= H264PROFILE_MIN && video_profile_ <= H264PROFILE_MAX) {
// For H264, we need to feed HW one frame at a time. This is going to take
// some parsing of our input stream.
decoder_h264_parser_->SetStream(data, size);
H264NALU nalu;
H264Parser::Result result;
*endpos = 0;
// Keep on peeking the next NALs while they don't indicate a frame
// boundary.
for (;;) {
bool end_of_frame = false;
result = decoder_h264_parser_->AdvanceToNextNALU(&nalu);
if (result == H264Parser::kInvalidStream ||
result == H264Parser::kUnsupportedStream)
return false;
if (result == H264Parser::kEOStream) {
// We've reached the end of the buffer before finding a frame boundary.
decoder_partial_frame_pending_ = true;
*endpos = size;
return true;
}
switch (nalu.nal_unit_type) {
case H264NALU::kNonIDRSlice:
case H264NALU::kIDRSlice:
if (nalu.size < 1)
return false;
// For these two, if the "first_mb_in_slice" field is zero, start a
// new frame and return. This field is Exp-Golomb coded starting on
// the eighth data bit of the NAL; a zero value is encoded with a
// leading '1' bit in the byte, which we can detect as the byte being
// (unsigned) greater than or equal to 0x80.
if (nalu.data[1] >= 0x80) {
end_of_frame = true;
break;
}
break;
case H264NALU::kSEIMessage:
case H264NALU::kSPS:
case H264NALU::kPPS:
case H264NALU::kAUD:
case H264NALU::kEOSeq:
case H264NALU::kEOStream:
case H264NALU::kReserved14:
case H264NALU::kReserved15:
case H264NALU::kReserved16:
case H264NALU::kReserved17:
case H264NALU::kReserved18:
// These unconditionally signal a frame boundary.
end_of_frame = true;
break;
default:
// For all others, keep going.
break;
}
if (end_of_frame) {
if (!decoder_partial_frame_pending_ && *endpos == 0) {
// The frame was previously restarted, and we haven't filled the
// current frame with any contents yet. Start the new frame here and
// continue parsing NALs.
} else {
// The frame wasn't previously restarted and/or we have contents for
// the current frame; signal the start of a new frame here: we don't
// have a partial frame anymore.
decoder_partial_frame_pending_ = false;
return true;
}
}
*endpos = (nalu.data + nalu.size) - data;
}
NOTREACHED();
return false;
} else {
DCHECK_GE(video_profile_, VP8PROFILE_MIN);
DCHECK_LE(video_profile_, VP9PROFILE_MAX);
// For VP8/9, we can just dump the entire buffer. No fragmentation needed,
// and we never return a partial frame.
*endpos = size;
decoder_partial_frame_pending_ = false;
return true;
}
}
void V4L2VideoDecodeAccelerator::ScheduleDecodeBufferTaskIfNeeded() {
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
// If we're behind on tasks, schedule another one.
int buffers_to_decode = decoder_input_queue_.size();
if (decoder_current_bitstream_buffer_ != NULL)
buffers_to_decode++;
if (decoder_decode_buffer_tasks_scheduled_ < buffers_to_decode) {
decoder_decode_buffer_tasks_scheduled_++;
decoder_thread_.task_runner()->PostTask(
FROM_HERE, base::Bind(&V4L2VideoDecodeAccelerator::DecodeBufferTask,
base::Unretained(this)));
}
}
bool V4L2VideoDecodeAccelerator::DecodeBufferInitial(const void* data,
size_t size,
size_t* endpos) {
DVLOGF(3) << "data=" << data << ", size=" << size;
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_EQ(decoder_state_, kInitialized);
// Initial decode. We haven't been able to get output stream format info yet.
// Get it, and start decoding.
// Copy in and send to HW.
if (!AppendToInputFrame(data, size))
return false;
// If we only have a partial frame, don't flush and process yet.
if (decoder_partial_frame_pending_)
return true;
if (!FlushInputFrame())
return false;
// Recycle buffers.
Dequeue();
*endpos = size;
// If an initial resolution change event is not done yet, a driver probably
// needs more stream to decode format.
// Return true and schedule next buffer without changing status to kDecoding.
// If the initial resolution change is done and coded size is known, we may
// still have to wait for AssignPictureBuffers() and output buffers to be
// allocated.
if (coded_size_.IsEmpty() || output_buffer_map_.empty()) {
// Need more stream to decode format, return true and schedule next buffer.
return true;
}
decoder_state_ = kDecoding;
ScheduleDecodeBufferTaskIfNeeded();
return true;
}
bool V4L2VideoDecodeAccelerator::DecodeBufferContinue(const void* data,
size_t size) {
DVLOGF(4) << "data=" << data << ", size=" << size;
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_EQ(decoder_state_, kDecoding);
// Both of these calls will set kError state if they fail.
// Only flush the frame if it's complete.
return (AppendToInputFrame(data, size) &&
(decoder_partial_frame_pending_ || FlushInputFrame()));
}
bool V4L2VideoDecodeAccelerator::AppendToInputFrame(const void* data,
size_t size) {
DVLOGF(4);
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_NE(decoder_state_, kUninitialized);
DCHECK_NE(decoder_state_, kResetting);
DCHECK_NE(decoder_state_, kError);
// This routine can handle data == NULL and size == 0, which occurs when
// we queue an empty buffer for the purposes of flushing the pipe.
// Flush if we're too big
if (decoder_current_input_buffer_ != -1) {
InputRecord& input_record =
input_buffer_map_[decoder_current_input_buffer_];
if (input_record.bytes_used + size > input_record.length) {
if (!FlushInputFrame())
return false;
decoder_current_input_buffer_ = -1;
}
}
// Try to get an available input buffer
if (decoder_current_input_buffer_ == -1) {
if (free_input_buffers_.empty()) {
// See if we can get more free buffers from HW
Dequeue();
if (free_input_buffers_.empty()) {
// Nope!
DVLOGF(4) << "stalled for input buffers";
return false;
}
}
decoder_current_input_buffer_ = free_input_buffers_.back();
free_input_buffers_.pop_back();
InputRecord& input_record =
input_buffer_map_[decoder_current_input_buffer_];
DCHECK_EQ(input_record.bytes_used, 0);
DCHECK_EQ(input_record.input_id, -1);
DCHECK(decoder_current_bitstream_buffer_ != NULL);
input_record.input_id = decoder_current_bitstream_buffer_->input_id;
}
DCHECK(data != NULL || size == 0);
if (size == 0) {
// If we asked for an empty buffer, return now. We return only after
// getting the next input buffer, since we might actually want an empty
// input buffer for flushing purposes.
return true;
}
// Copy in to the buffer.
InputRecord& input_record = input_buffer_map_[decoder_current_input_buffer_];
if (size > input_record.length - input_record.bytes_used) {
VLOGF(1) << "over-size frame, erroring";
NOTIFY_ERROR(UNREADABLE_INPUT);
return false;
}
memcpy(reinterpret_cast<uint8_t*>(input_record.address) +
input_record.bytes_used,
data, size);
input_record.bytes_used += size;
return true;
}
bool V4L2VideoDecodeAccelerator::FlushInputFrame() {
DVLOGF(4);
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_NE(decoder_state_, kUninitialized);
DCHECK_NE(decoder_state_, kResetting);
DCHECK_NE(decoder_state_, kError);
if (decoder_current_input_buffer_ == -1)
return true;
InputRecord& input_record = input_buffer_map_[decoder_current_input_buffer_];
DCHECK_NE(input_record.input_id, -1);
DCHECK(input_record.input_id != kFlushBufferId ||
input_record.bytes_used == 0);
// * if input_id >= 0, this input buffer was prompted by a bitstream buffer we
// got from the client. We can skip it if it is empty.
// * if input_id < 0 (should be kFlushBufferId in this case), this input
// buffer was prompted by a flush buffer, and should be queued even when
// empty.
if (input_record.input_id >= 0 && input_record.bytes_used == 0) {
input_record.input_id = -1;
free_input_buffers_.push_back(decoder_current_input_buffer_);
decoder_current_input_buffer_ = -1;
return true;
}
// Queue it.
input_ready_queue_.push(decoder_current_input_buffer_);
decoder_current_input_buffer_ = -1;
DVLOGF(4) << "submitting input_id=" << input_record.input_id;
// Enqueue once since there's new available input for it.
Enqueue();
return (decoder_state_ != kError);
}
void V4L2VideoDecodeAccelerator::ServiceDeviceTask(bool event_pending) {
DVLOGF(4);
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_NE(decoder_state_, kUninitialized);
if (decoder_state_ == kResetting) {
DVLOGF(3) << "early out: kResetting state";
return;
} else if (decoder_state_ == kError) {
DVLOGF(3) << "early out: kError state";
return;
} else if (decoder_state_ == kChangingResolution) {
DVLOGF(3) << "early out: kChangingResolution state";
return;
}
bool resolution_change_pending = false;
if (event_pending)
resolution_change_pending = DequeueResolutionChangeEvent();
if (!resolution_change_pending && coded_size_.IsEmpty()) {
// Some platforms do not send an initial resolution change event.
// To work around this, we need to keep checking if the initial resolution
// is known already by explicitly querying the format after each decode,
// regardless of whether we received an event.
// This needs to be done on initial resolution change,
// i.e. when coded_size_.IsEmpty().
// Try GetFormatInfo to check if an initial resolution change can be done.
struct v4l2_format format;
Size visible_size;
bool again;
if (GetFormatInfo(&format, &visible_size, &again) && !again) {
resolution_change_pending = true;
DequeueResolutionChangeEvent();
}
}
Dequeue();
Enqueue();
// Clear the interrupt fd.
if (!device_->ClearDevicePollInterrupt()) {
NOTIFY_ERROR(PLATFORM_FAILURE);
return;
}
bool poll_device = false;
// Add fd, if we should poll on it.
// Can be polled as soon as either input or output buffers are queued.
if (input_buffer_queued_count_ + output_buffer_queued_count_ > 0)
poll_device = true;
// ServiceDeviceTask() should only ever be scheduled from DevicePollTask(),
// so either:
// * device_poll_thread_ is running normally
// * device_poll_thread_ scheduled us, but then a ResetTask() or DestroyTask()
// shut it down, in which case we're either in kResetting or kError states
// respectively, and we should have early-outed already.
DCHECK(device_poll_thread_.message_loop());
// Queue the DevicePollTask() now.
device_poll_thread_.task_runner()->PostTask(
FROM_HERE, base::Bind(&V4L2VideoDecodeAccelerator::DevicePollTask,
base::Unretained(this), poll_device));
DVLOGF(3) << "ServiceDeviceTask(): buffer counts: DEC["
<< decoder_input_queue_.size() << "->"
<< input_ready_queue_.size() << "] => DEVICE["
<< free_input_buffers_.size() << "+"
<< input_buffer_queued_count_ << "/"
<< input_buffer_map_.size() << "->"
<< free_output_buffers_.size() << "+"
<< output_buffer_queued_count_ << "/"
<< output_buffer_map_.size() << "] => CLIENT["
<< decoder_frames_at_client_ << "]";
ScheduleDecodeBufferTaskIfNeeded();
if (resolution_change_pending)
StartResolutionChange();
}
void V4L2VideoDecodeAccelerator::Enqueue() {
DVLOGF(4);
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_NE(decoder_state_, kUninitialized);
// Drain the pipe of completed decode buffers.
const int old_inputs_queued = input_buffer_queued_count_;
while (!input_ready_queue_.empty()) {
const int buffer = input_ready_queue_.front();
InputRecord& input_record = input_buffer_map_[buffer];
if (input_record.input_id == kFlushBufferId && decoder_cmd_supported_) {
// Send the flush command after all input buffers are dequeued. This makes
// sure all previous resolution changes have been handled because the
// driver must hold the input buffer that triggers resolution change. The
// driver cannot decode data in it without new output buffers. If we send
// the flush now and a queued input buffer triggers resolution change
// later, the driver will send an output buffer that has
// V4L2_BUF_FLAG_LAST. But some queued input buffer have not been decoded
// yet. Also, V4L2VDA calls STREAMOFF and STREAMON after resolution
// change. They implicitly send a V4L2_DEC_CMD_STOP and V4L2_DEC_CMD_START
// to the decoder.
if (input_buffer_queued_count_ == 0) {
if (!SendDecoderCmdStop())
return;
input_ready_queue_.pop();
free_input_buffers_.push_back(buffer);
input_record.input_id = -1;
} else {
break;
}
} else if (!EnqueueInputRecord())
return;
}
if (old_inputs_queued == 0 && input_buffer_queued_count_ != 0) {
// We just started up a previously empty queue.
// Queue state changed; signal interrupt.
if (!device_->SetDevicePollInterrupt()) {
VPLOGF(1) << "SetDevicePollInterrupt failed";
NOTIFY_ERROR(PLATFORM_FAILURE);
return;
}
// Start VIDIOC_STREAMON if we haven't yet.
if (!input_streamon_) {
__u32 type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
IOCTL_OR_ERROR_RETURN(VIDIOC_STREAMON, &type);
input_streamon_ = true;
}
}
// Enqueue all the outputs we can.
const int old_outputs_queued = output_buffer_queued_count_;
while (!free_output_buffers_.empty()) {
if (!EnqueueOutputRecord())
return;
}
if (old_outputs_queued == 0 && output_buffer_queued_count_ != 0) {
// We just started up a previously empty queue.
// Queue state changed; signal interrupt.
if (!device_->SetDevicePollInterrupt()) {
VPLOGF(1) << "SetDevicePollInterrupt(): failed";
NOTIFY_ERROR(PLATFORM_FAILURE);
return;
}
// Start VIDIOC_STREAMON if we haven't yet.
if (!output_streamon_) {
__u32 type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
IOCTL_OR_ERROR_RETURN(VIDIOC_STREAMON, &type);
output_streamon_ = true;
}
}
}
bool V4L2VideoDecodeAccelerator::DequeueResolutionChangeEvent() {
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_NE(decoder_state_, kUninitialized);
DVLOGF(3);
struct v4l2_event ev;
memset(&ev, 0, sizeof(ev));
while (device_->Ioctl(VIDIOC_DQEVENT, &ev) == 0) {
if (ev.type == V4L2_EVENT_SOURCE_CHANGE) {
if (ev.u.src_change.changes & V4L2_EVENT_SRC_CH_RESOLUTION) {
VLOGF(2) << "got resolution change event.";
return true;
}
} else {
VLOGF(1) << "got an event (" << ev.type << ") we haven't subscribed to.";
}
}
return false;
}
void V4L2VideoDecodeAccelerator::Dequeue() {
DVLOGF(4);
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_NE(decoder_state_, kUninitialized);
while (input_buffer_queued_count_ > 0) {
if (!DequeueInputBuffer())
break;
}
while (output_buffer_queued_count_ > 0) {
if (!DequeueOutputBuffer())
break;
}
NotifyFlushDoneIfNeeded();
}
bool V4L2VideoDecodeAccelerator::DequeueInputBuffer() {
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_GT(input_buffer_queued_count_, 0);
DCHECK(input_streamon_);
// Dequeue a completed input (VIDEO_OUTPUT) buffer, and recycle to the free
// list.
struct v4l2_buffer dqbuf;
struct v4l2_plane planes[1];
memset(&dqbuf, 0, sizeof(dqbuf));
memset(planes, 0, sizeof(planes));
dqbuf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
dqbuf.memory = V4L2_MEMORY_MMAP;
dqbuf.m.planes = planes;
dqbuf.length = 1;
if (device_->Ioctl(VIDIOC_DQBUF, &dqbuf) != 0) {
if (errno == EAGAIN) {
// EAGAIN if we're just out of buffers to dequeue.
return false;
}
VPLOGF(1) << "ioctl() failed: VIDIOC_DQBUF";
NOTIFY_ERROR(PLATFORM_FAILURE);
return false;
}
InputRecord& input_record = input_buffer_map_[dqbuf.index];
DCHECK(input_record.at_device);
free_input_buffers_.push_back(dqbuf.index);
input_record.at_device = false;
input_record.bytes_used = 0;
input_record.input_id = -1;
input_buffer_queued_count_--;
return true;
}
bool V4L2VideoDecodeAccelerator::DequeueOutputBuffer() {
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_GT(output_buffer_queued_count_, 0);
DCHECK(output_streamon_);
// Dequeue a completed output (VIDEO_CAPTURE) buffer, and queue to the
// completed queue.
struct v4l2_buffer dqbuf;
std::unique_ptr<struct v4l2_plane[]> planes(
new v4l2_plane[output_planes_count_]);
memset(&dqbuf, 0, sizeof(dqbuf));
memset(planes.get(), 0, sizeof(struct v4l2_plane) * output_planes_count_);
dqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
dqbuf.memory = V4L2_MEMORY_MMAP;
dqbuf.m.planes = planes.get();
dqbuf.length = output_planes_count_;
if (device_->Ioctl(VIDIOC_DQBUF, &dqbuf) != 0) {
if (errno == EAGAIN) {
// EAGAIN if we're just out of buffers to dequeue.
return false;
} else if (errno == EPIPE) {
DVLOGF(3) << "Got EPIPE. Last output buffer was already dequeued.";
return false;
}
VPLOGF(1) << "ioctl() failed: VIDIOC_DQBUF";
NOTIFY_ERROR(PLATFORM_FAILURE);
return false;
}
OutputRecord& output_record = output_buffer_map_[dqbuf.index];
DCHECK_EQ(output_record.state, kAtDevice);
DCHECK_NE(output_record.picture_id, -1);
output_buffer_queued_count_--;
if (dqbuf.m.planes[0].bytesused == 0) {
// This is an empty output buffer returned as part of a flush.
output_record.state = kFree;
free_output_buffers_.push_back(dqbuf.index);
} else {
int32_t bitstream_buffer_id = dqbuf.timestamp.tv_sec;
DCHECK_GE(bitstream_buffer_id, 0);
DVLOGF(4) << "Dequeue output buffer: dqbuf index=" << dqbuf.index
<< " bitstream input_id=" << bitstream_buffer_id;
output_record.state = kAtClient;
decoder_frames_at_client_++;
const Picture picture(output_record.picture_id, bitstream_buffer_id,
Rect(visible_size_), false);
pending_picture_ready_.push(PictureRecord(output_record.cleared, picture));
SendPictureReady();
output_record.cleared = true;
}
if (dqbuf.flags & V4L2_BUF_FLAG_LAST) {
DVLOGF(3) << "Got last output buffer. Waiting last buffer="
<< flush_awaiting_last_output_buffer_;
if (flush_awaiting_last_output_buffer_) {
flush_awaiting_last_output_buffer_ = false;
struct v4l2_decoder_cmd cmd;
memset(&cmd, 0, sizeof(cmd));
cmd.cmd = V4L2_DEC_CMD_START;
IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_DECODER_CMD, &cmd);
}
}
return true;
}
bool V4L2VideoDecodeAccelerator::EnqueueInputRecord() {
DVLOGF(4);
DCHECK(!input_ready_queue_.empty());
// Enqueue an input (VIDEO_OUTPUT) buffer.
const int buffer = input_ready_queue_.front();
InputRecord& input_record = input_buffer_map_[buffer];
DCHECK(!input_record.at_device);
struct v4l2_buffer qbuf;
struct v4l2_plane qbuf_plane;
memset(&qbuf, 0, sizeof(qbuf));
memset(&qbuf_plane, 0, sizeof(qbuf_plane));
qbuf.index = buffer;
qbuf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
qbuf.timestamp.tv_sec = input_record.input_id;
qbuf.memory = V4L2_MEMORY_MMAP;
qbuf.m.planes = &qbuf_plane;
qbuf.m.planes[0].bytesused = input_record.bytes_used;
qbuf.length = 1;
IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_QBUF, &qbuf);
input_ready_queue_.pop();
input_record.at_device = true;
input_buffer_queued_count_++;
DVLOGF(4) << "enqueued input_id=" << input_record.input_id
<< " size=" << input_record.bytes_used;
return true;
}
bool V4L2VideoDecodeAccelerator::EnqueueOutputRecord() {
DCHECK(!free_output_buffers_.empty());
// Enqueue an output (VIDEO_CAPTURE) buffer.
const int buffer = free_output_buffers_.front();
DVLOGF(4) << "buffer " << buffer;
OutputRecord& output_record = output_buffer_map_[buffer];
DCHECK_EQ(output_record.state, kFree);
DCHECK_NE(output_record.picture_id, -1);
struct v4l2_buffer qbuf;
std::unique_ptr<struct v4l2_plane[]> qbuf_planes(
new v4l2_plane[output_planes_count_]);
memset(&qbuf, 0, sizeof(qbuf));
memset(qbuf_planes.get(), 0,
sizeof(struct v4l2_plane) * output_planes_count_);
qbuf.index = buffer;
qbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
qbuf.memory = V4L2_MEMORY_MMAP;
qbuf.m.planes = qbuf_planes.get();
qbuf.length = output_planes_count_;
DVLOGF(4) << "qbuf.index=" << qbuf.index;
IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_QBUF, &qbuf);
free_output_buffers_.pop_front();
output_record.state = kAtDevice;
output_buffer_queued_count_++;
return true;
}
void V4L2VideoDecodeAccelerator::ReusePictureBufferTask(int32_t picture_buffer_id) {
DVLOGF(4) << "picture_buffer_id=" << picture_buffer_id;
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
// We run ReusePictureBufferTask even if we're in kResetting.
if (decoder_state_ == kError) {
DVLOGF(4) << "early out: kError state";
return;
}
if (decoder_state_ == kChangingResolution) {
DVLOGF(4) << "early out: kChangingResolution";
return;
}
size_t index;
for (index = 0; index < output_buffer_map_.size(); ++index)
if (output_buffer_map_[index].picture_id == picture_buffer_id)
break;
if (index >= output_buffer_map_.size()) {
// It's possible that we've already posted a DismissPictureBuffer for this
// picture, but it has not yet executed when this ReusePictureBuffer was
// posted to us by the client. In that case just ignore this (we've already
// dismissed it and accounted for that) and let the sync object get
// destroyed.
DVLOGF(3) << "got picture id= " << picture_buffer_id
<< " not in use (anymore?).";
return;
}
OutputRecord& output_record = output_buffer_map_[index];
if (output_record.state != kAtClient) {
VLOGF(1) << "picture_buffer_id not reusable";
NOTIFY_ERROR(INVALID_ARGUMENT);
return;
}
output_record.state = kFree;
free_output_buffers_.push_back(index);
decoder_frames_at_client_--;
// We got a buffer back, so enqueue it back.
Enqueue();
}
void V4L2VideoDecodeAccelerator::FlushTask() {
VLOGF(2);
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
if (decoder_state_ == kError) {
VLOGF(2) << "early out: kError state";
return;
}
// We don't support stacked flushing.
DCHECK(!decoder_flushing_);
// Queue up an empty buffer -- this triggers the flush.
decoder_input_queue_.push(
linked_ptr<BitstreamBufferRef>(new BitstreamBufferRef(
decode_client_, decode_task_runner_, nullptr, kFlushBufferId)));
decoder_flushing_ = true;
SendPictureReady(); // Send all pending PictureReady.
ScheduleDecodeBufferTaskIfNeeded();
}
void V4L2VideoDecodeAccelerator::NotifyFlushDoneIfNeeded() {
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
if (!decoder_flushing_)
return;
// Pipeline is empty when:
// * Decoder input queue is empty of non-delayed buffers.
// * There is no currently filling input buffer.
// * Input holding queue is empty.
// * All input (VIDEO_OUTPUT) buffers are returned.
// * All image processor buffers are returned.
if (!decoder_input_queue_.empty()) {
if (decoder_input_queue_.front()->input_id !=
decoder_delay_bitstream_buffer_id_) {
DVLOGF(3) << "Some input bitstream buffers are not queued.";
return;
}
}
if (decoder_current_input_buffer_ != -1) {
DVLOGF(3) << "Current input buffer != -1";
return;
}
if ((input_ready_queue_.size() + input_buffer_queued_count_) != 0) {
DVLOGF(3) << "Some input buffers are not dequeued.";
return;
}
if (flush_awaiting_last_output_buffer_) {
DVLOGF(3) << "Waiting for last output buffer.";
return;
}
// TODO(posciak): https://crbug.com/270039. Exynos requires a
// streamoff-streamon sequence after flush to continue, even if we are not
// resetting. This would make sense, because we don't really want to resume
// from a non-resume point (e.g. not from an IDR) if we are flushed.
// MSE player however triggers a Flush() on chunk end, but never Reset(). One
// could argue either way, or even say that Flush() is not needed/harmful when
// transitioning to next chunk.
// For now, do the streamoff-streamon cycle to satisfy Exynos and not freeze
// when doing MSE. This should be harmless otherwise.
if (!(StopDevicePoll() && StopOutputStream() && StopInputStream()))
return;
if (!StartDevicePoll())
return;
decoder_delay_bitstream_buffer_id_ = -1;
decoder_flushing_ = false;
VLOGF(2) << "returning flush";
child_task_runner_->PostTask(FROM_HERE,
base::Bind(&Client::NotifyFlushDone, client_));
// While we were flushing, we early-outed DecodeBufferTask()s.
ScheduleDecodeBufferTaskIfNeeded();
}
bool V4L2VideoDecodeAccelerator::IsDecoderCmdSupported() {
// CMD_STOP should always succeed. If the decoder is started, the command can
// flush it. If the decoder is stopped, the command does nothing. We use this
// to know if a driver supports V4L2_DEC_CMD_STOP to flush.
struct v4l2_decoder_cmd cmd;
memset(&cmd, 0, sizeof(cmd));
cmd.cmd = V4L2_DEC_CMD_STOP;
if (device_->Ioctl(VIDIOC_TRY_DECODER_CMD, &cmd) != 0) {
VLOGF(2) << "V4L2_DEC_CMD_STOP is not supported.";
return false;
}
return true;
}
bool V4L2VideoDecodeAccelerator::SendDecoderCmdStop() {
VLOGF(2);
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK(!flush_awaiting_last_output_buffer_);
struct v4l2_decoder_cmd cmd;
memset(&cmd, 0, sizeof(cmd));
cmd.cmd = V4L2_DEC_CMD_STOP;
IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_DECODER_CMD, &cmd);
flush_awaiting_last_output_buffer_ = true;
return true;
}
void V4L2VideoDecodeAccelerator::ResetTask() {
VLOGF(2);
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
if (decoder_state_ == kError) {
VLOGF(2) << "early out: kError state";
return;
}
decoder_current_bitstream_buffer_.reset();
while (!decoder_input_queue_.empty())
decoder_input_queue_.pop();
decoder_current_input_buffer_ = -1;
// If we are in the middle of switching resolutions or awaiting picture
// buffers, postpone reset until it's done. We don't have to worry about
// timing of this wrt to decoding, because output pipe is already
// stopped if we are changing resolution. We will come back here after
// we are done.
DCHECK(!reset_pending_);
if (decoder_state_ == kChangingResolution ||
decoder_state_ == kAwaitingPictureBuffers) {
reset_pending_ = true;
return;
}
FinishReset();
}
void V4L2VideoDecodeAccelerator::FinishReset() {
VLOGF(2);
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
reset_pending_ = false;
// After the output stream is stopped, the codec should not post any
// resolution change events. So we dequeue the resolution change event
// afterwards. The event could be posted before or while stopping the output
// stream. The codec will expect the buffer of new size after the seek, so
// we need to handle the resolution change event first.
if (!(StopDevicePoll() && StopOutputStream()))
return;
if (DequeueResolutionChangeEvent()) {
reset_pending_ = true;
StartResolutionChange();
return;
}
if (!StopInputStream())
return;
// If we were flushing, we'll never return any more BitstreamBuffers or
// PictureBuffers; they have all been dropped and returned by now.
NotifyFlushDoneIfNeeded();
// Mark that we're resetting, then enqueue a ResetDoneTask(). All intervening
// jobs will early-out in the kResetting state.
decoder_state_ = kResetting;
SendPictureReady(); // Send all pending PictureReady.
decoder_thread_.task_runner()->PostTask(
FROM_HERE, base::Bind(&V4L2VideoDecodeAccelerator::ResetDoneTask,
base::Unretained(this)));
}
void V4L2VideoDecodeAccelerator::ResetDoneTask() {
VLOGF(2);
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
if (decoder_state_ == kError) {
VLOGF(2) << "early out: kError state";
return;
}
// Start poll thread if NotifyFlushDoneIfNeeded has not already.
if (!device_poll_thread_.IsRunning()) {
if (!StartDevicePoll())
return;
}
// Reset format-specific bits.
if (video_profile_ >= H264PROFILE_MIN && video_profile_ <= H264PROFILE_MAX) {
decoder_h264_parser_.reset(new H264Parser());
}
// Jobs drained, we're finished resetting.
DCHECK_EQ(decoder_state_, kResetting);
decoder_state_ = kInitialized;
decoder_partial_frame_pending_ = false;
decoder_delay_bitstream_buffer_id_ = -1;
child_task_runner_->PostTask(FROM_HERE,
base::Bind(&Client::NotifyResetDone, client_));
// While we were resetting, we early-outed DecodeBufferTask()s.
ScheduleDecodeBufferTaskIfNeeded();
}
void V4L2VideoDecodeAccelerator::DestroyTask() {
VLOGF(2);
// DestroyTask() should run regardless of decoder_state_.
StopDevicePoll();
StopOutputStream();
StopInputStream();
decoder_current_bitstream_buffer_.reset();
decoder_current_input_buffer_ = -1;
decoder_decode_buffer_tasks_scheduled_ = 0;
decoder_frames_at_client_ = 0;
while (!decoder_input_queue_.empty())
decoder_input_queue_.pop();
decoder_flushing_ = false;
// Set our state to kError. Just in case.
decoder_state_ = kError;
DestroyInputBuffers();
DestroyOutputBuffers();
}
bool V4L2VideoDecodeAccelerator::StartDevicePoll() {
DVLOGF(3);
DCHECK(!device_poll_thread_.IsRunning());
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
// Start up the device poll thread and schedule its first DevicePollTask().
if (!device_poll_thread_.Start()) {
VLOGF(1) << "Device thread failed to start";
NOTIFY_ERROR(PLATFORM_FAILURE);
return false;
}
device_poll_thread_.task_runner()->PostTask(
FROM_HERE, base::Bind(&V4L2VideoDecodeAccelerator::DevicePollTask,
base::Unretained(this), 0));
return true;
}
bool V4L2VideoDecodeAccelerator::StopDevicePoll() {
DVLOGF(3);
if (!device_poll_thread_.IsRunning())
return true;
if (decoder_thread_.IsRunning())
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
// Signal the DevicePollTask() to stop, and stop the device poll thread.
if (!device_->SetDevicePollInterrupt()) {
VPLOGF(1) << "SetDevicePollInterrupt(): failed";
NOTIFY_ERROR(PLATFORM_FAILURE);
return false;
}
device_poll_thread_.Stop();
// Clear the interrupt now, to be sure.
if (!device_->ClearDevicePollInterrupt()) {
NOTIFY_ERROR(PLATFORM_FAILURE);
return false;
}
DVLOGF(3) << "device poll stopped";
return true;
}
bool V4L2VideoDecodeAccelerator::StopOutputStream() {
VLOGF(2);
if (!output_streamon_)
return true;
__u32 type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_STREAMOFF, &type);
output_streamon_ = false;
// Output stream is stopped. No need to wait for the buffer anymore.
flush_awaiting_last_output_buffer_ = false;
for (size_t i = 0; i < output_buffer_map_.size(); ++i) {
// After streamoff, the device drops ownership of all buffers, even if we
// don't dequeue them explicitly. Some of them may still be owned by the
// client however. Reuse only those that aren't.
OutputRecord& output_record = output_buffer_map_[i];
if (output_record.state == kAtDevice) {
output_record.state = kFree;
free_output_buffers_.push_back(i);
}
}
output_buffer_queued_count_ = 0;
return true;
}
bool V4L2VideoDecodeAccelerator::StopInputStream() {
VLOGF(2);
if (!input_streamon_)
return true;
__u32 type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_STREAMOFF, &type);
input_streamon_ = false;
// Reset accounting info for input.
while (!input_ready_queue_.empty())
input_ready_queue_.pop();
free_input_buffers_.clear();
for (size_t i = 0; i < input_buffer_map_.size(); ++i) {
free_input_buffers_.push_back(i);
input_buffer_map_[i].at_device = false;
input_buffer_map_[i].bytes_used = 0;
input_buffer_map_[i].input_id = -1;
}
input_buffer_queued_count_ = 0;
return true;
}
void V4L2VideoDecodeAccelerator::StartResolutionChange() {
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_NE(decoder_state_, kUninitialized);
DCHECK_NE(decoder_state_, kResetting);
VLOGF(2) << "Initiate resolution change";
if (!(StopDevicePoll() && StopOutputStream()))
return;
decoder_state_ = kChangingResolution;
SendPictureReady(); // Send all pending PictureReady.
if (!DestroyOutputBuffers()) {
VLOGF(1) << "Failed destroying output buffers.";
NOTIFY_ERROR(PLATFORM_FAILURE);
return;
}
FinishResolutionChange();
}
void V4L2VideoDecodeAccelerator::FinishResolutionChange() {
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_EQ(decoder_state_, kChangingResolution);
VLOGF(2);
if (decoder_state_ == kError) {
VLOGF(2) << "early out: kError state";
return;
}
struct v4l2_format format;
bool again;
Size visible_size;
bool ret = GetFormatInfo(&format, &visible_size, &again);
if (!ret || again) {
VLOGF(1) << "Couldn't get format information after resolution change";
NOTIFY_ERROR(PLATFORM_FAILURE);
return;
}
if (!CreateBuffersForFormat(format, visible_size)) {
VLOGF(1) << "Couldn't reallocate buffers after resolution change";
NOTIFY_ERROR(PLATFORM_FAILURE);
return;
}
if (!StartDevicePoll())
return;
}
void V4L2VideoDecodeAccelerator::DevicePollTask(bool poll_device) {
DVLOGF(4);
DCHECK(device_poll_thread_.task_runner()->BelongsToCurrentThread());
bool event_pending = false;
if (!device_->Poll(poll_device, &event_pending)) {
NOTIFY_ERROR(PLATFORM_FAILURE);
return;
}
// All processing should happen on ServiceDeviceTask(), since we shouldn't
// touch decoder state from this thread.
decoder_thread_.task_runner()->PostTask(
FROM_HERE, base::Bind(&V4L2VideoDecodeAccelerator::ServiceDeviceTask,
base::Unretained(this), event_pending));
}
void V4L2VideoDecodeAccelerator::NotifyError(Error error) {
VLOGF(1);
if (!child_task_runner_->BelongsToCurrentThread()) {
child_task_runner_->PostTask(
FROM_HERE, base::Bind(&V4L2VideoDecodeAccelerator::NotifyError,
weak_this_, error));
return;
}
if (client_) {
client_->NotifyError(error);
client_ptr_factory_.reset();
}
}
void V4L2VideoDecodeAccelerator::SetErrorState(Error error) {
// We can touch decoder_state_ only if this is the decoder thread or the
// decoder thread isn't running.
if (decoder_thread_.task_runner() &&
!decoder_thread_.task_runner()->BelongsToCurrentThread()) {
decoder_thread_.task_runner()->PostTask(
FROM_HERE, base::Bind(&V4L2VideoDecodeAccelerator::SetErrorState,
base::Unretained(this), error));
return;
}
// Post NotifyError only if we are already initialized, as the API does
// not allow doing so before that.
if (decoder_state_ != kError && decoder_state_ != kUninitialized)
NotifyError(error);
decoder_state_ = kError;
}
bool V4L2VideoDecodeAccelerator::GetFormatInfo(struct v4l2_format* format,
Size* visible_size,
bool* again) {
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
*again = false;
memset(format, 0, sizeof(*format));
format->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
if (device_->Ioctl(VIDIOC_G_FMT, format) != 0) {
if (errno == EINVAL) {
// EINVAL means we haven't seen sufficient stream to decode the format.
*again = true;
return true;
} else {
VPLOGF(1) << "ioctl() failed: VIDIOC_G_FMT";
NOTIFY_ERROR(PLATFORM_FAILURE);
return false;
}
}
// Make sure we are still getting the format we set on initialization.
if (format->fmt.pix_mp.pixelformat != output_format_fourcc_) {
VLOGF(1) << "Unexpected format from G_FMT on output";
return false;
}
Size coded_size(format->fmt.pix_mp.width, format->fmt.pix_mp.height);
if (visible_size != nullptr)
*visible_size = GetVisibleSize(coded_size);
return true;
}
bool V4L2VideoDecodeAccelerator::CreateBuffersForFormat(
const struct v4l2_format& format,
const Size& visible_size) {
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
output_planes_count_ = format.fmt.pix_mp.num_planes;
coded_size_.SetSize(format.fmt.pix_mp.width, format.fmt.pix_mp.height);
visible_size_ = visible_size;
VLOGF(2) << "new resolution: " << coded_size_.ToString()
<< ", visible size: " << visible_size_.ToString()
<< ", decoder output planes count: " << output_planes_count_;
return CreateOutputBuffers();
}
Size V4L2VideoDecodeAccelerator::GetVisibleSize(
const Size& coded_size) {
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
struct v4l2_rect* visible_rect;
struct v4l2_selection selection_arg;
memset(&selection_arg, 0, sizeof(selection_arg));
selection_arg.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
selection_arg.target = V4L2_SEL_TGT_COMPOSE;
if (device_->Ioctl(VIDIOC_G_SELECTION, &selection_arg) == 0) {
VLOGF(2) << "VIDIOC_G_SELECTION is supported";
visible_rect = &selection_arg.r;
} else {
VLOGF(2) << "Fallback to VIDIOC_G_CROP";
struct v4l2_crop crop_arg;
memset(&crop_arg, 0, sizeof(crop_arg));
crop_arg.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
if (device_->Ioctl(VIDIOC_G_CROP, &crop_arg) != 0) {
VPLOGF(1) << "ioctl() VIDIOC_G_CROP failed";
return coded_size;
}
visible_rect = &crop_arg.c;
}
Rect rect(visible_rect->left, visible_rect->top, visible_rect->width,
visible_rect->height);
VLOGF(2) << "visible rectangle is " << rect.ToString();
if (!Rect(coded_size).Contains(rect)) {
DVLOGF(3) << "visible rectangle " << rect.ToString()
<< " is not inside coded size " << coded_size.ToString();
return coded_size;
}
if (rect.IsEmpty()) {
VLOGF(1) << "visible size is empty";
return coded_size;
}
// Chrome assume picture frame is coded at (0, 0).
if (rect.x() != 0 || rect.y() != 0) {
VLOGF(1) << "Unexpected visible rectangle " << rect.ToString()
<< ", top-left is not origin";
return coded_size;
}
return rect.size();
}
bool V4L2VideoDecodeAccelerator::CreateInputBuffers() {
VLOGF(2);
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
// We always run this as we prepare to initialize.
DCHECK_EQ(decoder_state_, kInitialized);
DCHECK(!input_streamon_);
DCHECK(input_buffer_map_.empty());
struct v4l2_requestbuffers reqbufs;
memset(&reqbufs, 0, sizeof(reqbufs));
reqbufs.count = kInputBufferCount;
reqbufs.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
reqbufs.memory = V4L2_MEMORY_MMAP;
IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_REQBUFS, &reqbufs);
input_buffer_map_.resize(reqbufs.count);
for (size_t i = 0; i < input_buffer_map_.size(); ++i) {
free_input_buffers_.push_back(i);
// Query for the MEMORY_MMAP pointer.
struct v4l2_plane planes[1];
struct v4l2_buffer buffer;
memset(&buffer, 0, sizeof(buffer));
memset(planes, 0, sizeof(planes));
buffer.index = i;
buffer.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
buffer.memory = V4L2_MEMORY_MMAP;
buffer.m.planes = planes;
buffer.length = 1;
IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_QUERYBUF, &buffer);
void* address = device_->Mmap(NULL,
buffer.m.planes[0].length,
PROT_READ | PROT_WRITE,
MAP_SHARED,
buffer.m.planes[0].m.mem_offset);
if (address == MAP_FAILED) {
VPLOGF(1) << "mmap() failed";
return false;
}
input_buffer_map_[i].address = address;
input_buffer_map_[i].length = buffer.m.planes[0].length;
}
return true;
}
static bool IsSupportedOutputFormat(uint32_t v4l2_format) {
// Only support V4L2_PIX_FMT_NV12 output format for now.
// TODO(johnylin): add more supported format if necessary.
uint32_t kSupportedOutputFmtFourcc[] = { V4L2_PIX_FMT_NV12 };
return std::find(
kSupportedOutputFmtFourcc,
kSupportedOutputFmtFourcc + arraysize(kSupportedOutputFmtFourcc),
v4l2_format) !=
kSupportedOutputFmtFourcc + arraysize(kSupportedOutputFmtFourcc);
}
bool V4L2VideoDecodeAccelerator::SetupFormats() {
// We always run this as we prepare to initialize.
DCHECK(child_task_runner_->BelongsToCurrentThread());
DCHECK_EQ(decoder_state_, kUninitialized);
DCHECK(!input_streamon_);
DCHECK(!output_streamon_);
size_t input_size;
Size max_resolution, min_resolution;
device_->GetSupportedResolution(input_format_fourcc_, &min_resolution,
&max_resolution);
if (max_resolution.width() > 1920 && max_resolution.height() > 1088)
input_size = kInputBufferMaxSizeFor4k;
else
input_size = kInputBufferMaxSizeFor1080p;
struct v4l2_fmtdesc fmtdesc;
memset(&fmtdesc, 0, sizeof(fmtdesc));
fmtdesc.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
bool is_format_supported = false;
while (device_->Ioctl(VIDIOC_ENUM_FMT, &fmtdesc) == 0) {
if (fmtdesc.pixelformat == input_format_fourcc_) {
is_format_supported = true;
break;
}
++fmtdesc.index;
}
if (!is_format_supported) {
VLOGF(1) << "Input fourcc " << input_format_fourcc_
<< " not supported by device.";
return false;
}
struct v4l2_format format;
memset(&format, 0, sizeof(format));
format.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
format.fmt.pix_mp.pixelformat = input_format_fourcc_;
format.fmt.pix_mp.plane_fmt[0].sizeimage = input_size;
format.fmt.pix_mp.num_planes = 1;
IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_S_FMT, &format);
// We have to set up the format for output, because the driver may not allow
// changing it once we start streaming; whether it can support our chosen
// output format or not may depend on the input format.
memset(&fmtdesc, 0, sizeof(fmtdesc));
fmtdesc.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
while (device_->Ioctl(VIDIOC_ENUM_FMT, &fmtdesc) == 0) {
if (IsSupportedOutputFormat(fmtdesc.pixelformat)) {
output_format_fourcc_ = fmtdesc.pixelformat;
break;
}
++fmtdesc.index;
}
if (output_format_fourcc_ == 0) {
VLOGF(2) << "Image processor not available";
return false;
}
VLOGF(2) << "Output format=" << output_format_fourcc_;
// Just set the fourcc for output; resolution, etc., will come from the
// driver once it extracts it from the stream.
memset(&format, 0, sizeof(format));
format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
format.fmt.pix_mp.pixelformat = output_format_fourcc_;
IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_S_FMT, &format);
return true;
}
bool V4L2VideoDecodeAccelerator::CreateOutputBuffers() {
VLOGF(2);
DCHECK(decoder_state_ == kInitialized ||
decoder_state_ == kChangingResolution);
DCHECK(!output_streamon_);
DCHECK(output_buffer_map_.empty());
DCHECK_EQ(output_mode_, Config::OutputMode::IMPORT);
// Number of output buffers we need.
struct v4l2_control ctrl;
memset(&ctrl, 0, sizeof(ctrl));
ctrl.id = V4L2_CID_MIN_BUFFERS_FOR_CAPTURE;
IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_G_CTRL, &ctrl);
output_dpb_size_ = ctrl.value;
// Output format setup in Initialize().
uint32_t buffer_count = output_dpb_size_ + kDpbOutputBufferExtraCount;
VideoPixelFormat pixel_format =
V4L2Device::V4L2PixFmtToVideoPixelFormat(output_format_fourcc_);
child_task_runner_->PostTask(
FROM_HERE, base::Bind(&Client::ProvidePictureBuffers, client_,
buffer_count, pixel_format, coded_size_));
// Go into kAwaitingPictureBuffers to prevent us from doing any more decoding
// or event handling while we are waiting for AssignPictureBuffers(). Not
// having Pictures available would not have prevented us from making decoding
// progress entirely e.g. in the case of H.264 where we could further decode
// non-slice NALUs and could even get another resolution change before we were
// done with this one. After we get the buffers, we'll go back into kIdle and
// kick off further event processing, and eventually go back into kDecoding
// once no more events are pending (if any).
decoder_state_ = kAwaitingPictureBuffers;
return true;
}
void V4L2VideoDecodeAccelerator::DestroyInputBuffers() {
VLOGF(2);
DCHECK(!decoder_thread_.IsRunning() ||
decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK(!input_streamon_);
if (input_buffer_map_.empty())
return;
for (size_t i = 0; i < input_buffer_map_.size(); ++i) {
if (input_buffer_map_[i].address != NULL) {
device_->Munmap(input_buffer_map_[i].address,
input_buffer_map_[i].length);
}
}
struct v4l2_requestbuffers reqbufs;
memset(&reqbufs, 0, sizeof(reqbufs));
reqbufs.count = 0;
reqbufs.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
reqbufs.memory = V4L2_MEMORY_MMAP;
IOCTL_OR_LOG_ERROR(VIDIOC_REQBUFS, &reqbufs);
input_buffer_map_.clear();
free_input_buffers_.clear();
}
bool V4L2VideoDecodeAccelerator::DestroyOutputBuffers() {
VLOGF(2);
DCHECK(!decoder_thread_.IsRunning() ||
decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK(!output_streamon_);
bool success = true;
if (output_buffer_map_.empty())
return true;
for (size_t i = 0; i < output_buffer_map_.size(); ++i) {
OutputRecord& output_record = output_buffer_map_[i];
DVLOGF(3) << "dismissing PictureBuffer id=" << output_record.picture_id;
child_task_runner_->PostTask(
FROM_HERE, base::Bind(&Client::DismissPictureBuffer, client_,
output_record.picture_id));
}
struct v4l2_requestbuffers reqbufs;
memset(&reqbufs, 0, sizeof(reqbufs));
reqbufs.count = 0;
reqbufs.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
reqbufs.memory = V4L2_MEMORY_MMAP;
if (device_->Ioctl(VIDIOC_REQBUFS, &reqbufs) != 0) {
VPLOGF(1) << "ioctl() failed: VIDIOC_REQBUFS";
NOTIFY_ERROR(PLATFORM_FAILURE);
success = false;
}
output_buffer_map_.clear();
while (!free_output_buffers_.empty())
free_output_buffers_.pop_front();
output_buffer_queued_count_ = 0;
// The client may still hold some buffers. The texture holds a reference to
// the buffer. It is OK to free the buffer and destroy EGLImage here.
decoder_frames_at_client_ = 0;
return success;
}
void V4L2VideoDecodeAccelerator::SendPictureReady() {
DVLOGF(4);
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
bool send_now = (decoder_state_ == kChangingResolution ||
decoder_state_ == kResetting || decoder_flushing_);
while (pending_picture_ready_.size() > 0) {
bool cleared = pending_picture_ready_.front().cleared;
const Picture& picture = pending_picture_ready_.front().picture;
if (cleared && picture_clearing_count_ == 0) {
// This picture is cleared. It can be posted to a thread different than
// the main GPU thread to reduce latency. This should be the case after
// all pictures are cleared at the beginning.
decode_task_runner_->PostTask(
FROM_HERE,
base::Bind(&Client::PictureReady, decode_client_, picture));
pending_picture_ready_.pop();
} else if (!cleared || send_now) {
DVLOGF(4) << "cleared=" << pending_picture_ready_.front().cleared
<< ", decoder_state_=" << decoder_state_
<< ", decoder_flushing_=" << decoder_flushing_
<< ", picture_clearing_count_=" << picture_clearing_count_;
// If the picture is not cleared, post it to the child thread because it
// has to be cleared in the child thread. A picture only needs to be
// cleared once. If the decoder is changing resolution, resetting or
// flushing, send all pictures to ensure PictureReady arrive before
// ProvidePictureBuffers, NotifyResetDone, or NotifyFlushDone.
child_task_runner_->PostTaskAndReply(
FROM_HERE, base::Bind(&Client::PictureReady, client_, picture),
// Unretained is safe. If Client::PictureReady gets to run, |this| is
// alive. Destroy() will wait the decode thread to finish.
base::Bind(&V4L2VideoDecodeAccelerator::PictureCleared,
base::Unretained(this)));
picture_clearing_count_++;
pending_picture_ready_.pop();
} else {
// This picture is cleared. But some pictures are about to be cleared on
// the child thread. To preserve the order, do not send this until those
// pictures are cleared.
break;
}
}
}
void V4L2VideoDecodeAccelerator::PictureCleared() {
DVLOGF(4) << "clearing count=" << picture_clearing_count_;
DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
DCHECK_GT(picture_clearing_count_, 0);
picture_clearing_count_--;
SendPictureReady();
}
} // namespace media