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
|
// Copyright 2019 The libgav1 Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "examples/file_writer.h"
#include <cerrno>
#include <cstdio>
#include <cstring>
#include <new>
#include <string>
#if defined(_WIN32)
#include <fcntl.h>
#include <io.h>
#endif
#include "examples/logging.h"
namespace libgav1 {
namespace {
FILE* SetBinaryMode(FILE* stream) {
#if defined(_WIN32)
_setmode(_fileno(stream), _O_BINARY);
#endif
return stream;
}
std::string GetY4mColorSpaceString(
const FileWriter::Y4mParameters& y4m_parameters) {
std::string color_space_string;
switch (y4m_parameters.image_format) {
case kImageFormatMonochrome400:
color_space_string = "mono";
break;
case kImageFormatYuv420:
if (y4m_parameters.bitdepth == 8) {
if (y4m_parameters.chroma_sample_position ==
kChromaSamplePositionVertical) {
color_space_string = "420mpeg2";
} else if (y4m_parameters.chroma_sample_position ==
kChromaSamplePositionColocated) {
color_space_string = "420";
} else {
color_space_string = "420jpeg";
}
} else {
color_space_string = "420";
}
break;
case kImageFormatYuv422:
color_space_string = "422";
break;
case kImageFormatYuv444:
color_space_string = "444";
break;
}
if (y4m_parameters.bitdepth > 8) {
const bool monochrome =
y4m_parameters.image_format == kImageFormatMonochrome400;
if (!monochrome) color_space_string += "p";
color_space_string += std::to_string(y4m_parameters.bitdepth);
}
return color_space_string;
}
} // namespace
FileWriter::~FileWriter() { fclose(file_); }
std::unique_ptr<FileWriter> FileWriter::Open(
const std::string& file_name, FileType file_type,
const Y4mParameters* const y4m_parameters) {
if (file_name.empty() ||
(file_type == kFileTypeY4m && y4m_parameters == nullptr) ||
(file_type != kFileTypeRaw && file_type != kFileTypeY4m)) {
LIBGAV1_EXAMPLES_LOG_ERROR("Invalid parameters");
return nullptr;
}
FILE* raw_file_ptr;
if (file_name == "-") {
raw_file_ptr = SetBinaryMode(stdout);
} else {
raw_file_ptr = fopen(file_name.c_str(), "wb");
}
if (raw_file_ptr == nullptr) {
LIBGAV1_EXAMPLES_LOG_ERROR("Unable to open output file");
return nullptr;
}
std::unique_ptr<FileWriter> file(new (std::nothrow) FileWriter(raw_file_ptr));
if (file == nullptr) {
LIBGAV1_EXAMPLES_LOG_ERROR("Out of memory");
fclose(raw_file_ptr);
return nullptr;
}
if (file_type == kFileTypeY4m && !file->WriteY4mFileHeader(*y4m_parameters)) {
LIBGAV1_EXAMPLES_LOG_ERROR("Error writing Y4M file header");
return nullptr;
}
file->file_type_ = file_type;
return file;
}
bool FileWriter::WriteFrame(const DecoderBuffer& frame_buffer) {
if (file_type_ == kFileTypeY4m) {
const char kY4mFrameHeader[] = "FRAME\n";
if (fwrite(kY4mFrameHeader, 1, strlen(kY4mFrameHeader), file_) !=
strlen(kY4mFrameHeader)) {
LIBGAV1_EXAMPLES_LOG_ERROR("Error writing Y4M frame header");
return false;
}
}
const size_t pixel_size =
(frame_buffer.bitdepth == 8) ? sizeof(uint8_t) : sizeof(uint16_t);
for (int plane_index = 0; plane_index < frame_buffer.NumPlanes();
++plane_index) {
const int height = frame_buffer.displayed_height[plane_index];
const int width = frame_buffer.displayed_width[plane_index];
const int stride = frame_buffer.stride[plane_index];
const uint8_t* const plane_pointer = frame_buffer.plane[plane_index];
for (int row = 0; row < height; ++row) {
const uint8_t* const row_pointer = &plane_pointer[row * stride];
if (fwrite(row_pointer, pixel_size, width, file_) !=
static_cast<size_t>(width)) {
char error_string[256];
snprintf(error_string, sizeof(error_string),
"File write failed: %s (errno=%d)", strerror(errno), errno);
LIBGAV1_EXAMPLES_LOG_ERROR(error_string);
return false;
}
}
}
return true;
}
// Writes Y4M file header to |file_| and returns true when successful.
//
// A Y4M file begins with a plaintext file signature of 'YUV4MPEG2 '.
//
// Following the signature is any number of optional parameters preceded by a
// space. We always write:
//
// Width: 'W' followed by image width in pixels.
// Height: 'H' followed by image height in pixels.
// Frame Rate: 'F' followed frames/second in the form numerator:denominator.
// Interlacing: 'I' followed by 'p' for progressive.
// Color space: 'C' followed by a string representation of the color space.
//
// More info here: https://wiki.multimedia.cx/index.php/YUV4MPEG2
bool FileWriter::WriteY4mFileHeader(const Y4mParameters& y4m_parameters) {
std::string y4m_header = "YUV4MPEG2";
y4m_header += " W" + std::to_string(y4m_parameters.width);
y4m_header += " H" + std::to_string(y4m_parameters.height);
y4m_header += " F" + std::to_string(y4m_parameters.frame_rate_numerator) +
":" + std::to_string(y4m_parameters.frame_rate_denominator);
y4m_header += " Ip C" + GetY4mColorSpaceString(y4m_parameters);
y4m_header += "\n";
return fwrite(y4m_header.c_str(), 1, y4m_header.length(), file_) ==
y4m_header.length();
}
} // namespace libgav1
|
