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// 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 "media/base/stream_parser_buffer.h"
#include "base/logging.h"
#include "media/base/timestamp_constants.h"
namespace media {
static scoped_refptr<StreamParserBuffer> CopyBuffer(
const StreamParserBuffer& buffer) {
if (buffer.end_of_stream())
return StreamParserBuffer::CreateEOSBuffer();
scoped_refptr<StreamParserBuffer> copied_buffer =
StreamParserBuffer::CopyFrom(buffer.data(),
buffer.data_size(),
buffer.side_data(),
buffer.side_data_size(),
buffer.is_key_frame(),
buffer.type(),
buffer.track_id());
copied_buffer->SetDecodeTimestamp(buffer.GetDecodeTimestamp());
copied_buffer->SetConfigId(buffer.GetConfigId());
copied_buffer->set_timestamp(buffer.timestamp());
copied_buffer->set_duration(buffer.duration());
copied_buffer->set_is_duration_estimated(buffer.is_duration_estimated());
copied_buffer->set_discard_padding(buffer.discard_padding());
copied_buffer->set_splice_timestamp(buffer.splice_timestamp());
const DecryptConfig* decrypt_config = buffer.decrypt_config();
if (decrypt_config) {
copied_buffer->set_decrypt_config(
make_scoped_ptr(new DecryptConfig(decrypt_config->key_id(),
decrypt_config->iv(),
decrypt_config->subsamples())));
}
return copied_buffer;
}
scoped_refptr<StreamParserBuffer> StreamParserBuffer::CreateEOSBuffer() {
return make_scoped_refptr(new StreamParserBuffer(NULL, 0, NULL, 0, false,
DemuxerStream::UNKNOWN, 0));
}
scoped_refptr<StreamParserBuffer> StreamParserBuffer::CopyFrom(
const uint8_t* data,
int data_size,
bool is_key_frame,
Type type,
TrackId track_id) {
return make_scoped_refptr(
new StreamParserBuffer(data, data_size, NULL, 0, is_key_frame, type,
track_id));
}
scoped_refptr<StreamParserBuffer> StreamParserBuffer::CopyFrom(
const uint8_t* data,
int data_size,
const uint8_t* side_data,
int side_data_size,
bool is_key_frame,
Type type,
TrackId track_id) {
return make_scoped_refptr(
new StreamParserBuffer(data, data_size, side_data, side_data_size,
is_key_frame, type, track_id));
}
DecodeTimestamp StreamParserBuffer::GetDecodeTimestamp() const {
if (decode_timestamp_ == kNoDecodeTimestamp())
return DecodeTimestamp::FromPresentationTime(timestamp());
return decode_timestamp_;
}
void StreamParserBuffer::SetDecodeTimestamp(DecodeTimestamp timestamp) {
decode_timestamp_ = timestamp;
if (preroll_buffer_.get())
preroll_buffer_->SetDecodeTimestamp(timestamp);
}
StreamParserBuffer::StreamParserBuffer(const uint8_t* data,
int data_size,
const uint8_t* side_data,
int side_data_size,
bool is_key_frame,
Type type,
TrackId track_id)
: DecoderBuffer(data, data_size, side_data, side_data_size),
decode_timestamp_(kNoDecodeTimestamp()),
config_id_(kInvalidConfigId),
type_(type),
track_id_(track_id),
is_duration_estimated_(false) {
// TODO(scherkus): Should DataBuffer constructor accept a timestamp and
// duration to force clients to set them? Today they end up being zero which
// is both a common and valid value and could lead to bugs.
if (data) {
set_duration(kNoTimestamp());
}
if (is_key_frame)
set_is_key_frame(true);
}
StreamParserBuffer::~StreamParserBuffer() {}
int StreamParserBuffer::GetConfigId() const {
return config_id_;
}
void StreamParserBuffer::SetConfigId(int config_id) {
config_id_ = config_id;
if (preroll_buffer_.get())
preroll_buffer_->SetConfigId(config_id);
}
int StreamParserBuffer::GetSpliceBufferConfigId(size_t index) const {
return index < splice_buffers().size()
? splice_buffers_[index]->GetConfigId()
: GetConfigId();
}
const char* StreamParserBuffer::GetTypeName() const {
switch (type()) {
case DemuxerStream::AUDIO:
return "audio";
case DemuxerStream::VIDEO:
return "video";
case DemuxerStream::TEXT:
return "text";
case DemuxerStream::UNKNOWN:
return "unknown";
case DemuxerStream::NUM_TYPES:
// Fall-through to NOTREACHED().
break;
}
NOTREACHED();
return "";
}
void StreamParserBuffer::ConvertToSpliceBuffer(
const BufferQueue& pre_splice_buffers) {
DCHECK(splice_buffers_.empty());
DCHECK(duration() > base::TimeDelta())
<< "Only buffers with a valid duration can convert to a splice buffer."
<< " pts " << timestamp().InSecondsF()
<< " dts " << GetDecodeTimestamp().InSecondsF()
<< " dur " << duration().InSecondsF();
DCHECK(!end_of_stream());
// Splicing requires non-estimated sample accurate durations to be confident
// things will sound smooth. Also, we cannot be certain whether estimated
// overlap is really a splice scenario, or just over estimation.
DCHECK(!is_duration_estimated_);
// Make a copy of this first, before making any changes.
scoped_refptr<StreamParserBuffer> overlapping_buffer = CopyBuffer(*this);
overlapping_buffer->set_splice_timestamp(kNoTimestamp());
const scoped_refptr<StreamParserBuffer>& first_splice_buffer =
pre_splice_buffers.front();
// Ensure the given buffers are actually before the splice point.
DCHECK(first_splice_buffer->timestamp() <= overlapping_buffer->timestamp());
// TODO(dalecurtis): We should also clear |data| and |side_data|, but since
// that implies EOS care must be taken to ensure there are no clients relying
// on that behavior.
// Move over any preroll from this buffer.
if (preroll_buffer_.get()) {
DCHECK(!overlapping_buffer->preroll_buffer_.get());
overlapping_buffer->preroll_buffer_.swap(preroll_buffer_);
}
// Rewrite |this| buffer as a splice buffer.
SetDecodeTimestamp(first_splice_buffer->GetDecodeTimestamp());
SetConfigId(first_splice_buffer->GetConfigId());
set_timestamp(first_splice_buffer->timestamp());
set_is_key_frame(first_splice_buffer->is_key_frame());
type_ = first_splice_buffer->type();
track_id_ = first_splice_buffer->track_id();
set_splice_timestamp(overlapping_buffer->timestamp());
// The splice duration is the duration of all buffers before the splice plus
// the highest ending timestamp after the splice point.
DCHECK(overlapping_buffer->duration() > base::TimeDelta());
DCHECK(pre_splice_buffers.back()->duration() > base::TimeDelta());
set_duration(
std::max(overlapping_buffer->timestamp() + overlapping_buffer->duration(),
pre_splice_buffers.back()->timestamp() +
pre_splice_buffers.back()->duration()) -
first_splice_buffer->timestamp());
// Copy all pre splice buffers into our wrapper buffer.
for (BufferQueue::const_iterator it = pre_splice_buffers.begin();
it != pre_splice_buffers.end();
++it) {
const scoped_refptr<StreamParserBuffer>& buffer = *it;
DCHECK(!buffer->end_of_stream());
DCHECK(!buffer->preroll_buffer().get());
DCHECK(buffer->splice_buffers().empty());
DCHECK(!buffer->is_duration_estimated());
splice_buffers_.push_back(CopyBuffer(*buffer.get()));
splice_buffers_.back()->set_splice_timestamp(splice_timestamp());
}
splice_buffers_.push_back(overlapping_buffer);
}
void StreamParserBuffer::SetPrerollBuffer(
const scoped_refptr<StreamParserBuffer>& preroll_buffer) {
DCHECK(!preroll_buffer_.get());
DCHECK(!end_of_stream());
DCHECK(!preroll_buffer->end_of_stream());
DCHECK(!preroll_buffer->preroll_buffer_.get());
DCHECK(preroll_buffer->splice_timestamp() == kNoTimestamp());
DCHECK(preroll_buffer->splice_buffers().empty());
DCHECK(preroll_buffer->timestamp() <= timestamp());
DCHECK(preroll_buffer->discard_padding() == DecoderBuffer::DiscardPadding());
DCHECK_EQ(preroll_buffer->type(), type());
DCHECK_EQ(preroll_buffer->track_id(), track_id());
preroll_buffer_ = preroll_buffer;
preroll_buffer_->set_timestamp(timestamp());
preroll_buffer_->SetDecodeTimestamp(GetDecodeTimestamp());
// Mark the entire buffer for discard.
preroll_buffer_->set_discard_padding(
std::make_pair(kInfiniteDuration(), base::TimeDelta()));
}
void StreamParserBuffer::set_timestamp(base::TimeDelta timestamp) {
DecoderBuffer::set_timestamp(timestamp);
if (preroll_buffer_.get())
preroll_buffer_->set_timestamp(timestamp);
}
} // namespace media
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