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
|
/*
* Copyright (C) 2010 Apple, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "QTDecompressionSession.h"
#include <ImageCompression.h>
#include <algorithm>
class QTDecompressionSessionClient {
public:
static void trackingCallback(void *decompressionTrackingRefCon, OSStatus,
ICMDecompressionTrackingFlags decompressionTrackingFlags, CVPixelBufferRef pixelBuffer,
TimeValue64, TimeValue64, ICMValidTimeFlags, void *, void *)
{
QTDecompressionSession* session = static_cast<QTDecompressionSession*>(decompressionTrackingRefCon);
ASSERT(session);
if (decompressionTrackingFlags & kICMDecompressionTracking_FrameDecoded)
session->m_latestFrame = QTPixelBuffer(pixelBuffer);
}
};
PassOwnPtr<QTDecompressionSession> QTDecompressionSession::create(unsigned long pixelFormat, size_t width, size_t height)
{
return adoptPtr(new QTDecompressionSession(pixelFormat, width, height));
}
QTDecompressionSession::QTDecompressionSession(unsigned long pixelFormat, size_t width, size_t height)
: m_session(0)
, m_pixelFormat(pixelFormat)
, m_width(width)
, m_height(height)
{
initializeSession();
}
QTDecompressionSession::~QTDecompressionSession()
{
if (m_session)
ICMDecompressionSessionRelease(m_session);
}
void QTDecompressionSession::initializeSession()
{
if (m_session)
return;
ICMPixelFormatInfo pixelFormatInfo = {sizeof(ICMPixelFormatInfo), 0};
if (ICMGetPixelFormatInfo(m_pixelFormat, &pixelFormatInfo) != noErr) {
// The ICM does not know anything about the pixelFormat contained in
// the pixel buffer, so it won't be able to convert it to RGBA.
return;
}
// The depth and cType fields of the ImageDescriptionHandle are filled
// out according to the instructions in Technical Q&A QA1183:
// http://developer.apple.com/library/mac/#qa/qa2001/qa1183.html
bool isIndexed = pixelFormatInfo.formatFlags & kICMPixelFormatIsIndexed;
bool isQD = pixelFormatInfo.formatFlags & kICMPixelFormatIsSupportedByQD;
bool isMonochrome = pixelFormatInfo.formatFlags & kICMPixelFormatIsMonochrome;
bool hasAlpha = pixelFormatInfo.formatFlags & kICMPixelFormatHasAlphaChannel;
unsigned int depth = 24; // The default depth is 24.
if (hasAlpha)
depth = 32; // Any pixel format with alpha gets a depth of 32.
else if (isMonochrome) {
// Grayscale pixel formats get depths 33 through 40, depending
// on their bits per pixel. Yes, this means that 16-bit grayscale
// and 8-bit grayscale have the same pixel depth.
depth = 32 + std::min<unsigned int>(8, pixelFormatInfo.bitsPerPixel[0]);
} else if (isIndexed) {
// Indexed pixel formats get a depth of 1 through 8, depending on
// the their bits per pixel.
depth = pixelFormatInfo.bitsPerPixel[0];
}
// If QuickDraw supports the given pixel format, the cType should be kRawCodecType.
// Otherwise, use the pixel format code for the cType. We are assuming the pixel
// buffer is uncompressed.
unsigned long cType = isQD ? kRawCodecType : m_pixelFormat;
ImageDescriptionHandle description = (ImageDescriptionHandle)NewHandleClear(sizeof(ImageDescription));
(**description).idSize = sizeof(ImageDescription);
(**description).cType = cType;
(**description).version = 2;
(**description).spatialQuality = codecLosslessQuality;
(**description).width = m_width;
(**description).height = m_height;
(**description).hRes = 72 << 16; // 72 DPI as a fixed-point number
(**description).vRes = 72 << 16; // 72 DPI as a fixed-point number
(**description).frameCount = 1;
(**description).depth = depth;
(**description).clutID = -1;
// Create the mandatory ICMDecompressionSessionOptions, but leave
// all the default values.
ICMDecompressionSessionOptionsRef options = 0;
ICMDecompressionSessionOptionsCreate(kCFAllocatorDefault, &options);
CFDictionaryRef pixelBufferAttributes = QTPixelBuffer::createPixelBufferAttributesDictionary(QTPixelBuffer::ConfigureForCGImage);
ICMDecompressionTrackingCallbackRecord callback = {
QTDecompressionSessionClient::trackingCallback,
this,
};
ICMDecompressionSessionCreate(kCFAllocatorDefault,
description,
options,
pixelBufferAttributes,
&callback,
&m_session);
if (pixelBufferAttributes)
CFRelease(pixelBufferAttributes);
ICMDecompressionSessionOptionsRelease(options);
DisposeHandle((Handle)description);
}
bool QTDecompressionSession::canDecompress(QTPixelBuffer inBuffer)
{
return m_session
&& inBuffer.pixelFormatType() == m_pixelFormat
&& inBuffer.width() == m_width
&& inBuffer.height() == m_height;
}
QTPixelBuffer QTDecompressionSession::decompress(QTPixelBuffer inBuffer)
{
if (!canDecompress(inBuffer))
return QTPixelBuffer();
inBuffer.lockBaseAddress();
ICMDecompressionSessionDecodeFrame(m_session,
static_cast<UInt8*>(inBuffer.baseAddress()),
inBuffer.dataSize(),
0, // frameOptions
0, // frameTime
0); // sourceFrameRefCon
// Because we passed in 0 for frameTime, the above function
// is synchronous, and the client callback will have been
// called before the function returns, and m_latestFrame
// will contain the newly decompressed frame.
return m_latestFrame;
}
|
