FFmpeg  4.3
tiertexseqv.c
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1 /*
2  * Tiertex Limited SEQ Video Decoder
3  * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Tiertex Limited SEQ video decoder
25  */
26 
27 #define BITSTREAM_READER_LE
28 #include "avcodec.h"
29 #include "get_bits.h"
30 #include "internal.h"
31 
32 
33 typedef struct SeqVideoContext {
37 
38 
39 static const unsigned char *seq_unpack_rle_block(const unsigned char *src,
40  const unsigned char *src_end,
41  unsigned char *dst, int dst_size)
42 {
43  int i, len, sz;
44  GetBitContext gb;
45  int code_table[64];
46 
47  /* get the rle codes */
48  init_get_bits(&gb, src, (src_end - src) * 8);
49  for (i = 0, sz = 0; i < 64 && sz < dst_size; i++) {
50  if (get_bits_left(&gb) < 4)
51  return NULL;
52  code_table[i] = get_sbits(&gb, 4);
53  sz += FFABS(code_table[i]);
54  }
55  src += (get_bits_count(&gb) + 7) / 8;
56 
57  /* do the rle unpacking */
58  for (i = 0; i < 64 && dst_size > 0; i++) {
59  len = code_table[i];
60  if (len < 0) {
61  len = -len;
62  if (src_end - src < 1)
63  return NULL;
64  memset(dst, *src++, FFMIN(len, dst_size));
65  } else {
66  if (src_end - src < len)
67  return NULL;
68  memcpy(dst, src, FFMIN(len, dst_size));
69  src += len;
70  }
71  dst += len;
72  dst_size -= len;
73  }
74  return src;
75 }
76 
77 static const unsigned char *seq_decode_op1(SeqVideoContext *seq,
78  const unsigned char *src,
79  const unsigned char *src_end,
80  unsigned char *dst)
81 {
82  const unsigned char *color_table;
83  int b, i, len, bits;
84  GetBitContext gb;
85  unsigned char block[8 * 8];
86 
87  if (src_end - src < 1)
88  return NULL;
89  len = *src++;
90  if (len & 0x80) {
91  switch (len & 3) {
92  case 1:
93  src = seq_unpack_rle_block(src, src_end, block, sizeof(block));
94  for (b = 0; b < 8; b++) {
95  memcpy(dst, &block[b * 8], 8);
96  dst += seq->frame->linesize[0];
97  }
98  break;
99  case 2:
100  src = seq_unpack_rle_block(src, src_end, block, sizeof(block));
101  for (i = 0; i < 8; i++) {
102  for (b = 0; b < 8; b++)
103  dst[b * seq->frame->linesize[0]] = block[i * 8 + b];
104  ++dst;
105  }
106  break;
107  }
108  } else {
109  if (len <= 0)
110  return NULL;
111  bits = ff_log2_tab[len - 1] + 1;
112  if (src_end - src < len + 8 * bits)
113  return NULL;
114  color_table = src;
115  src += len;
116  init_get_bits(&gb, src, bits * 8 * 8); src += bits * 8;
117  for (b = 0; b < 8; b++) {
118  for (i = 0; i < 8; i++)
119  dst[i] = color_table[get_bits(&gb, bits)];
120  dst += seq->frame->linesize[0];
121  }
122  }
123 
124  return src;
125 }
126 
127 static const unsigned char *seq_decode_op2(SeqVideoContext *seq,
128  const unsigned char *src,
129  const unsigned char *src_end,
130  unsigned char *dst)
131 {
132  int i;
133 
134  if (src_end - src < 8 * 8)
135  return NULL;
136 
137  for (i = 0; i < 8; i++) {
138  memcpy(dst, src, 8);
139  src += 8;
140  dst += seq->frame->linesize[0];
141  }
142 
143  return src;
144 }
145 
146 static const unsigned char *seq_decode_op3(SeqVideoContext *seq,
147  const unsigned char *src,
148  const unsigned char *src_end,
149  unsigned char *dst)
150 {
151  int pos, offset;
152 
153  do {
154  if (src_end - src < 2)
155  return NULL;
156  pos = *src++;
157  offset = ((pos >> 3) & 7) * seq->frame->linesize[0] + (pos & 7);
158  dst[offset] = *src++;
159  } while (!(pos & 0x80));
160 
161  return src;
162 }
163 
164 static int seqvideo_decode(SeqVideoContext *seq, const unsigned char *data, int data_size)
165 {
166  const unsigned char *data_end = data + data_size;
167  GetBitContext gb;
168  int flags, i, j, x, y, op;
169  unsigned char c[3];
170  unsigned char *dst;
171  uint32_t *palette;
172 
173  flags = *data++;
174 
175  if (flags & 1) {
176  palette = (uint32_t *)seq->frame->data[1];
177  if (data_end - data < 256 * 3)
178  return AVERROR_INVALIDDATA;
179  for (i = 0; i < 256; i++) {
180  for (j = 0; j < 3; j++, data++)
181  c[j] = (*data << 2) | (*data >> 4);
182  palette[i] = 0xFFU << 24 | AV_RB24(c);
183  }
184  seq->frame->palette_has_changed = 1;
185  }
186 
187  if (flags & 2) {
188  if (data_end - data < 128)
189  return AVERROR_INVALIDDATA;
190  init_get_bits(&gb, data, 128 * 8); data += 128;
191  for (y = 0; y < 128; y += 8)
192  for (x = 0; x < 256; x += 8) {
193  dst = &seq->frame->data[0][y * seq->frame->linesize[0] + x];
194  op = get_bits(&gb, 2);
195  switch (op) {
196  case 1:
197  data = seq_decode_op1(seq, data, data_end, dst);
198  break;
199  case 2:
200  data = seq_decode_op2(seq, data, data_end, dst);
201  break;
202  case 3:
203  data = seq_decode_op3(seq, data, data_end, dst);
204  break;
205  }
206  if (!data)
207  return AVERROR_INVALIDDATA;
208  }
209  }
210  return 0;
211 }
212 
214 {
215  SeqVideoContext *seq = avctx->priv_data;
216  int ret;
217 
218  seq->avctx = avctx;
219  avctx->pix_fmt = AV_PIX_FMT_PAL8;
220 
221  ret = ff_set_dimensions(avctx, 256, 128);
222  if (ret < 0)
223  return ret;
224 
225  seq->frame = av_frame_alloc();
226  if (!seq->frame)
227  return AVERROR(ENOMEM);
228 
229  return 0;
230 }
231 
233  void *data, int *got_frame,
234  AVPacket *avpkt)
235 {
236  const uint8_t *buf = avpkt->data;
237  int buf_size = avpkt->size;
238  int ret;
239 
240  SeqVideoContext *seq = avctx->priv_data;
241 
242  if ((ret = ff_reget_buffer(avctx, seq->frame, 0)) < 0)
243  return ret;
244 
245  if (seqvideo_decode(seq, buf, buf_size))
246  return AVERROR_INVALIDDATA;
247 
248  if ((ret = av_frame_ref(data, seq->frame)) < 0)
249  return ret;
250  *got_frame = 1;
251 
252  return buf_size;
253 }
254 
256 {
257  SeqVideoContext *seq = avctx->priv_data;
258 
259  av_frame_free(&seq->frame);
260 
261  return 0;
262 }
263 
265  .name = "tiertexseqvideo",
266  .long_name = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ video"),
267  .type = AVMEDIA_TYPE_VIDEO,
269  .priv_data_size = sizeof(SeqVideoContext),
271  .close = seqvideo_decode_end,
273  .capabilities = AV_CODEC_CAP_DR1,
274 };
AVCodec
AVCodec.
Definition: codec.h:190
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
AVERROR
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
SeqVideoContext
Definition: tiertexseqv.c:33
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:355
b
#define b
Definition: input.c:41
data
const char data[16]
Definition: mxf.c:91
seqvideo_decode_end
static av_cold int seqvideo_decode_end(AVCodecContext *avctx)
Definition: tiertexseqv.c:255
SeqVideoContext::frame
AVFrame * frame
Definition: tiertexseqv.c:35
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:659
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
U
#define U(x)
Definition: vp56_arith.h:37
GetBitContext
Definition: get_bits.h:61
x
FFmpeg Automated Testing Environment ************************************Introduction Using FATE from your FFmpeg source directory Submitting the results to the FFmpeg result aggregation server Uploading new samples to the fate suite FATE makefile targets and variables Makefile targets Makefile variables Examples Introduction **************FATE is an extended regression suite on the client side and a means for results aggregation and presentation on the server side The first part of this document explains how you can use FATE from your FFmpeg source directory to test your ffmpeg binary The second part describes how you can run FATE to submit the results to FFmpeg’s FATE server In any way you can have a look at the publicly viewable FATE results by visiting this as it can be seen if some test on some platform broke with their recent contribution This usually happens on the platforms the developers could not test on The second part of this document describes how you can run FATE to submit your results to FFmpeg’s FATE server If you want to submit your results be sure to check that your combination of OS and compiler is not already listed on the above mentioned website In the third part you can find a comprehensive listing of FATE makefile targets and variables Using FATE from your FFmpeg source directory **********************************************If you want to run FATE on your machine you need to have the samples in place You can get the samples via the build target fate rsync Use this command from the top level source this will cause FATE to fail NOTE To use a custom wrapper to run the pass ‘ target exec’ to ‘configure’ or set the TARGET_EXEC Make variable Submitting the results to the FFmpeg result aggregation server ****************************************************************To submit your results to the server you should run fate through the shell script ‘tests fate sh’ from the FFmpeg sources This script needs to be invoked with a configuration file as its first argument tests fate sh path to fate_config A configuration file template with comments describing the individual configuration variables can be found at ‘doc fate_config sh template’ Create a configuration that suits your based on the configuration template The ‘slot’ configuration variable can be any string that is not yet but it is suggested that you name it adhering to the following pattern ‘ARCH OS COMPILER COMPILER VERSION’ The configuration file itself will be sourced in a shell therefore all shell features may be used This enables you to setup the environment as you need it for your build For your first test runs the ‘fate_recv’ variable should be empty or commented out This will run everything as normal except that it will omit the submission of the results to the server The following files should be present in $workdir as specified in the configuration it may help to try out the ‘ssh’ command with one or more ‘ v’ options You should get detailed output concerning your SSH configuration and the authentication process The only thing left is to automate the execution of the fate sh script and the synchronisation of the samples directory Uploading new samples to the fate suite *****************************************If you need a sample uploaded send a mail to samples request This is for developers who have an account on the fate suite server If you upload new please make sure they are as small as space on each network bandwidth and so on benefit from smaller test cases Also keep in mind older checkouts use existing sample that means in practice generally do not remove or overwrite files as it likely would break older checkouts or releases Also all needed samples for a commit should be ideally before the push If you need an account for frequently uploading samples or you wish to help others by doing that send a mail to ffmpeg devel rsync vauL Duo x
Definition: fate.txt:150
AV_RB24
#define AV_RB24
Definition: intreadwrite.h:64
SeqVideoContext::avctx
AVCodecContext * avctx
Definition: tiertexseqv.c:34
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
av_cold
#define av_cold
Definition: attributes.h:90
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
op
static int op(uint8_t **dst, const uint8_t *dst_end, GetByteContext *gb, int pixel, int count, int *x, int width, int linesize)
Perform decode operation.
Definition: anm.c:75
bits
uint8_t bits
Definition: vp3data.h:202
get_sbits
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:359
AV_CODEC_ID_TIERTEXSEQVIDEO
@ AV_CODEC_ID_TIERTEXSEQVIDEO
Definition: codec_id.h:144
get_bits.h
FFABS
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
if
if(ret)
Definition: filter_design.txt:179
NULL
#define NULL
Definition: coverity.c:32
src
#define src
Definition: vp8dsp.c:254
seqvideo_decode_frame
static int seqvideo_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: tiertexseqv.c:232
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
ff_log2_tab
const uint8_t ff_log2_tab[256]
Definition: log2_tab.c:23
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
AVPacket::size
int size
Definition: packet.h:356
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:186
av_frame_ref
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:444
FFMIN
#define FFMIN(a, b)
Definition: common.h:96
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
ff_tiertexseqvideo_decoder
AVCodec ff_tiertexseqvideo_decoder
Definition: tiertexseqv.c:264
seqvideo_decode_init
static av_cold int seqvideo_decode_init(AVCodecContext *avctx)
Definition: tiertexseqv.c:213
seq_unpack_rle_block
static const unsigned char * seq_unpack_rle_block(const unsigned char *src, const unsigned char *src_end, unsigned char *dst, int dst_size)
Definition: tiertexseqv.c:39
seq_decode_op1
static const unsigned char * seq_decode_op1(SeqVideoContext *seq, const unsigned char *src, const unsigned char *src_end, unsigned char *dst)
Definition: tiertexseqv.c:77
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
uint8_t
uint8_t
Definition: audio_convert.c:194
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:197
len
int len
Definition: vorbis_enc_data.h:452
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
avcodec.h
AV_PIX_FMT_PAL8
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
ff_reget_buffer
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Identical in function to ff_get_buffer(), except it reuses the existing buffer if available.
Definition: decode.c:1960
ret
ret
Definition: filter_design.txt:187
seq_decode_op3
static const unsigned char * seq_decode_op3(SeqVideoContext *seq, const unsigned char *src, const unsigned char *src_end, unsigned char *dst)
Definition: tiertexseqv.c:146
seq_decode_op2
static const unsigned char * seq_decode_op2(SeqVideoContext *seq, const unsigned char *src, const unsigned char *src_end, unsigned char *dst)
Definition: tiertexseqv.c:127
pos
unsigned int pos
Definition: spdifenc.c:410
seqvideo_decode
static int seqvideo_decode(SeqVideoContext *seq, const unsigned char *data, int data_size)
Definition: tiertexseqv.c:164
AVCodecContext
main external API structure.
Definition: avcodec.h:526
AVFrame::palette_has_changed
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:457
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
ff_set_dimensions
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:104
AVPacket
This structure stores compressed data.
Definition: packet.h:332
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:553
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:564
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:331
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
color_table
static const ColorEntry color_table[]
Definition: xpmdec.c:50