1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
// Copyright 2021 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/fuchsia/common/vmo_buffer_writer_queue.h"
#include <zircon/rights.h>
#include <algorithm>
#include "base/fuchsia/fuchsia_logging.h"
#include "base/process/process_metrics.h"
#include "media/base/decoder_buffer.h"
namespace media {
struct VmoBufferWriterQueue::PendingBuffer {
PendingBuffer(scoped_refptr<DecoderBuffer> buffer) : buffer(buffer) {
DCHECK(buffer);
}
~PendingBuffer() = default;
PendingBuffer(PendingBuffer&& other) = default;
PendingBuffer& operator=(PendingBuffer&& other) = default;
const uint8_t* data() const { return buffer->data() + buffer_pos; }
size_t bytes_left() const { return buffer->data_size() - buffer_pos; }
void AdvanceCurrentPos(size_t bytes) {
DCHECK_LE(bytes, bytes_left());
buffer_pos += bytes;
}
scoped_refptr<DecoderBuffer> buffer;
size_t buffer_pos = 0;
// Set to true when the consumer has finished processing the buffer and it can
// be released.
bool is_complete = false;
// Index of the last buffer in the sysmem buffer collection that was used to
// send this input buffer. Should be set only when |bytes_left()==0|.
absl::optional<size_t> tail_sysmem_buffer_index;
};
VmoBufferWriterQueue::VmoBufferWriterQueue() {
DETACH_FROM_THREAD(thread_checker_);
}
VmoBufferWriterQueue::~VmoBufferWriterQueue() = default;
void VmoBufferWriterQueue::EnqueueBuffer(scoped_refptr<DecoderBuffer> buffer) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
pending_buffers_.push_back(PendingBuffer(buffer));
PumpPackets();
}
void VmoBufferWriterQueue::Start(std::vector<VmoBuffer> buffers,
SendPacketCB send_packet_cb,
EndOfStreamCB end_of_stream_cb) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(buffers_.empty());
DCHECK(!buffers.empty());
buffers_ = std::move(buffers);
send_packet_cb_ = std::move(send_packet_cb);
end_of_stream_cb_ = std::move(end_of_stream_cb);
// Initialize |unused_buffers_|.
unused_buffers_.reserve(buffers_.size());
for (size_t i = 0; i < buffers_.size(); ++i) {
unused_buffers_.push_back(i);
}
PumpPackets();
}
bool VmoBufferWriterQueue::IsBlocked() const {
return unused_buffers_.empty();
}
void VmoBufferWriterQueue::PumpPackets() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
auto weak_this = weak_factory_.GetWeakPtr();
while (!buffers_.empty() && !is_paused_ &&
input_queue_position_ < pending_buffers_.size()) {
PendingBuffer* current_buffer = &pending_buffers_[input_queue_position_];
if (current_buffer->buffer->end_of_stream()) {
pending_buffers_.pop_front();
end_of_stream_cb_.Run();
if (!weak_this)
return;
continue;
}
if (unused_buffers_.empty()) {
// No input buffer available.
return;
}
size_t buffer_index = unused_buffers_.back();
unused_buffers_.pop_back();
size_t bytes_filled = buffers_[buffer_index].Write(
base::make_span(current_buffer->data(), current_buffer->bytes_left()));
current_buffer->AdvanceCurrentPos(bytes_filled);
bool buffer_end = current_buffer->bytes_left() == 0;
auto packet = StreamProcessorHelper::IoPacket(
buffer_index, /*offset=*/0, bytes_filled,
current_buffer->buffer->timestamp(), buffer_end,
base::BindOnce(&VmoBufferWriterQueue::ReleaseBuffer,
weak_factory_.GetWeakPtr(), buffer_index));
if (buffer_end) {
current_buffer->tail_sysmem_buffer_index = buffer_index;
input_queue_position_ += 1;
}
send_packet_cb_.Run(current_buffer->buffer.get(), std::move(packet));
if (!weak_this)
return;
}
}
void VmoBufferWriterQueue::ResetQueue() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
pending_buffers_.clear();
input_queue_position_ = 0;
is_paused_ = false;
}
void VmoBufferWriterQueue::ResetBuffers() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
buffers_.clear();
send_packet_cb_ = SendPacketCB();
end_of_stream_cb_ = EndOfStreamCB();
// Invalidate weak pointers, so ReleaseBuffer() is not called for the old
// buffers.
weak_factory_.InvalidateWeakPtrs();
}
void VmoBufferWriterQueue::ResetPositionAndPause() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
for (auto& buffer : pending_buffers_) {
buffer.buffer_pos = 0;
buffer.is_complete = false;
// All packets that were pending will need to be resent. Reset
// |tail_sysmem_buffer_index| to ensure that these packets are not removed
// from the queue in ReleaseBuffer().
buffer.tail_sysmem_buffer_index = absl::nullopt;
}
input_queue_position_ = 0;
is_paused_ = true;
}
void VmoBufferWriterQueue::Unpause() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(is_paused_);
is_paused_ = false;
PumpPackets();
}
void VmoBufferWriterQueue::ReleaseBuffer(size_t buffer_index) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(!buffers_.empty());
// Mark the input buffer as complete.
for (size_t i = 0; i < input_queue_position_; ++i) {
if (pending_buffers_[i].tail_sysmem_buffer_index == buffer_index)
pending_buffers_[i].is_complete = true;
}
// Remove all complete buffers from the head of the queue since we no longer
// need them. Note that currently StreamProcessor doesn't guarantee that input
// buffers are released in the same order they were sent (see
// https://fuchsia.googlesource.com/fuchsia/+/3b12c8c5/sdk/fidl/fuchsia.media/stream_processor.fidl#1646
// ). This means that some complete buffers will need to stay in the queue
// until all preceding packets are released as well.
while (!pending_buffers_.empty() && pending_buffers_.front().is_complete) {
pending_buffers_.pop_front();
DCHECK_GT(input_queue_position_, 0U);
input_queue_position_--;
}
unused_buffers_.push_back(buffer_index);
PumpPackets();
}
size_t VmoBufferWriterQueue::num_buffers() const {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
return buffers_.size();
}
} // namespace media
|
