FFmpeg
cbs_jpeg_syntax_template.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
20  JPEGRawFrameHeader *current)
21 {
22  int err, i;
23 
24  HEADER("Frame Header");
25 
26  u(16, Lf, 8, 8 + 3 * JPEG_MAX_COMPONENTS);
27 
28  u(8, P, 2, 16);
29  u(16, Y, 0, JPEG_MAX_HEIGHT);
30  u(16, X, 1, JPEG_MAX_WIDTH);
31  u(8, Nf, 1, JPEG_MAX_COMPONENTS);
32 
33  for (i = 0; i < current->Nf; i++) {
34  us(8, C[i], i, 0, JPEG_MAX_COMPONENTS);
35  us(4, H[i], i, 1, 4);
36  us(4, V[i], i, 1, 4);
37  us(8, Tq[i], i, 0, 3);
38  }
39 
40  return 0;
41 }
42 
44  JPEGRawQuantisationTable *current)
45 {
46  int err, i;
47 
48  u(4, Pq, 0, 1);
49  u(4, Tq, 0, 3);
50 
51  if (current->Pq) {
52  for (i = 0; i < 64; i++)
53  us(16, Q[i], i, 1, 255);
54  } else {
55  for (i = 0; i < 64; i++)
56  us(8, Q[i], i, 1, 255);
57  }
58 
59  return 0;
60 }
61 
64 {
65  int err, i, n;
66 
67  HEADER("Quantisation Tables");
68 
69  u(16, Lq, 2, 2 + 4 * 65);
70  n = current->Lq / 65;
71 
72  for (i = 0; i < n; i++)
73  CHECK(FUNC(quantisation_table)(ctx, rw, &current->table[i]));
74 
75  return 0;
76 }
77 
79  JPEGRawHuffmanTable *current)
80 {
81  int err, i, j, ij;
82 
83  u(4, Tc, 0, 1);
84  u(4, Th, 0, 3);
85 
86  for (i = 0; i < 16; i++)
87  us(8, L[i], i, 0, 224);
88 
89  ij = 0;
90  for (i = 0; i < 16; i++) {
91  for (j = 0; j < current->L[i]; j++) {
92  us(8, V[ij], ij, 0, 255);
93  ++ij;
94  }
95  }
96 
97  return 0;
98 }
99 
102 {
103  int err, i, j, n;
104 
105  HEADER("Huffman Tables");
106 
107  u(16, Lh, 2, 2 + 8 * (1 + 16 + 256));
108 
109  n = 2;
110  for (i = 0; n < current->Lh; i++) {
111  CHECK(FUNC(huffman_table)(ctx, rw, &current->table[i]));
112 
113  ++n;
114  for (j = 0; j < 16; j++)
115  n += 1 + current->table[i].L[j];
116  }
117 
118  return 0;
119 }
120 
122  JPEGRawScanHeader *current)
123 {
124  int err, j;
125 
126  HEADER("Scan");
127 
128  u(16, Ls, 6, 6 + 2 * JPEG_MAX_COMPONENTS);
129 
130  u(8, Ns, 1, 4);
131  for (j = 0; j < current->Ns; j++) {
132  us(8, Cs[j], j, 0, JPEG_MAX_COMPONENTS);
133  us(4, Td[j], j, 0, 3);
134  us(4, Ta[j], j, 0, 3);
135  }
136 
137  u(8, Ss, 0, 63);
138  u(8, Se, 0, 63);
139  u(4, Ah, 0, 13);
140  u(4, Al, 0, 15);
141 
142  return 0;
143 }
144 
146  JPEGRawApplicationData *current)
147 {
148  int err, i;
149 
150  HEADER("Application Data");
151 
152  u(16, Lp, 2, 65535);
153 
154  if (current->Lp > 2) {
155 #ifdef READ
156  current->Ap_ref = av_buffer_alloc(current->Lp - 2);
157  if (!current->Ap_ref)
158  return AVERROR(ENOMEM);
159  current->Ap = current->Ap_ref->data;
160 #endif
161 
162  for (i = 0; i < current->Lp - 2; i++)
163  us(8, Ap[i], i, 0, 255);
164  }
165 
166  return 0;
167 }
168 
170  JPEGRawComment *current)
171 {
172  int err, i;
173 
174  HEADER("Comment");
175 
176  u(16, Lc, 2, 65535);
177 
178  if (current->Lc > 2) {
179 #ifdef READ
180  current->Cm_ref = av_buffer_alloc(current->Lc - 2);
181  if (!current->Cm_ref)
182  return AVERROR(ENOMEM);
183  current->Cm = current->Cm_ref->data;
184 #endif
185 
186  for (i = 0; i < current->Lc - 2; i++)
187  us(8, Cm[i], i, 0, 255);
188  }
189 
190  return 0;
191 }
#define P
static int FUNC() dqt(CodedBitstreamContext *ctx, RWContext *rw, JPEGRawQuantisationTableSpecification *current)
#define RWContext
Definition: cbs_av1.c:662
#define us(width, name, range_min, range_max, subs,...)
Definition: cbs_h2645.c:266
Definition: vf_addroi.c:26
#define HEADER(name)
Definition: cbs_av1.c:533
static int FUNC() huffman_table(CodedBitstreamContext *ctx, RWContext *rw, JPEGRawHuffmanTable *current)
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:252
static int FUNC() scan_header(CodedBitstreamContext *ctx, RWContext *rw, JPEGRawScanHeader *current)
CHECK(-1) CHECK(-2)}}}}CHECK(1) CHECK(2)}}}}}if(diff0+diff1 > 0) temp-
static int FUNC() dht(CodedBitstreamContext *ctx, RWContext *rw, JPEGRawHuffmanTableSpecification *current)
static int FUNC() comment(CodedBitstreamContext *ctx, RWContext *rw, JPEGRawComment *current)
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define FUNC(a)
#define Y
Definition: boxblur.h:38
AVFormatContext * ctx
Definition: movenc.c:48
int n
Definition: avisynth_c.h:760
#define L(x)
Definition: vp56_arith.h:36
s EdgeDetect Foobar g libavfilter vf_edgedetect c libavfilter vf_foobar c edit libavfilter and add an entry for foobar following the pattern of the other filters edit libavfilter allfilters and add an entry for foobar following the pattern of the other filters configure make j< whatever > ffmpeg ffmpeg i you should get a foobar png with Lena edge detected That s your new playground is ready Some little details about what s going which in turn will define variables for the build system and the C
AVBufferRef * av_buffer_alloc(int size)
Allocate an AVBuffer of the given size using av_malloc().
Definition: buffer.c:67
Context structure for coded bitstream operations.
Definition: cbs.h:168
static int FUNC() application_data(CodedBitstreamContext *ctx, RWContext *rw, JPEGRawApplicationData *current)
#define H
Definition: pixlet.c:39
static int FUNC() quantisation_table(CodedBitstreamContext *ctx, RWContext *rw, JPEGRawQuantisationTable *current)
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
#define V
Definition: avdct.c:30