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81 switch (bpp * 2 +
be) {
84 return bytestream2_get_byte(gb);
86 return bytestream2_get_le16(gb);
88 return bytestream2_get_be16(gb);
90 return bytestream2_get_le32(gb);
92 return bytestream2_get_be32(gb);
100 const int bpp =
c->bpp2;
101 uint8_t *dst8 =
c->curbits;
102 uint16_t *dst16 = (uint16_t *)
c->curbits;
103 uint32_t *dst32 = (uint32_t *)
c->curbits;
105 for (j = 0; j <
c->cur_h; j++) {
106 for (
i = 0;
i <
c->cur_w;
i++) {
117 dst16 = (uint16_t*)
c->curmask;
118 dst32 = (uint32_t*)
c->curmask;
119 for (j = 0; j <
c->cur_h; j++) {
120 for (
i = 0;
i <
c->cur_w;
i++) {
137 if (
c->width <
c->cur_x +
c->cur_w)
138 w =
c->width -
c->cur_x;
140 if (
c->height <
c->cur_y +
c->cur_h)
141 h =
c->height -
c->cur_y;
153 if ((
w < 1) || (
h < 1))
155 dst += x *
c->bpp2 + y *
stride;
158 uint8_t *cd =
c->curbits, *msk =
c->curmask;
159 for (j = 0; j <
h; j++) {
160 for (
i = 0;
i <
w;
i++)
161 dst[
i] = (dst[
i] & cd[
i]) ^ msk[
i];
166 }
else if (
c->bpp2 == 2) {
167 uint16_t *cd = (uint16_t*)
c->curbits, *msk = (uint16_t*)
c->curmask;
169 for (j = 0; j <
h; j++) {
170 dst2 = (uint16_t*)dst;
171 for (
i = 0;
i <
w;
i++)
172 dst2[
i] = (dst2[
i] & cd[
i]) ^ msk[
i];
177 }
else if (
c->bpp2 == 4) {
178 uint32_t *cd = (uint32_t*)
c->curbits, *msk = (uint32_t*)
c->curmask;
180 for (j = 0; j <
h; j++) {
181 dst2 = (uint32_t*)dst;
182 for (
i = 0;
i <
w;
i++)
183 dst2[
i] = (dst2[
i] & cd[
i]) ^ msk[
i];
197 dst += dx * bpp + dy *
stride;
199 for (j = 0; j <
h; j++) {
203 }
else if (bpp == 2) {
205 for (j = 0; j <
h; j++) {
206 dst2 = (uint16_t*)dst;
207 for (
i = 0;
i <
w;
i++)
211 }
else if (bpp == 4) {
213 for (j = 0; j <
h; j++) {
214 dst2 = (uint32_t*)dst;
215 for (
i = 0;
i <
w;
i++)
227 for (j = 0; j <
h; j++) {
228 for (
i = 0;
i <
w;
i++) {
235 ((uint16_t*)dst)[
i] = p;
238 ((uint32_t*)dst)[
i] = p;
250 int bg = 0, fg = 0, rects,
color,
flags, xy, wh;
251 const int bpp =
c->bpp2;
253 int bw = 16, bh = 16;
255 for (j = 0; j <
h; j += 16) {
260 for (
i = 0;
i <
w;
i += 16, dst2 += 16 * bpp) {
267 flags = bytestream2_get_byte(gb);
281 rects = bytestream2_get_byte(gb);
290 for (k = 0; k < rects; k++) {
291 int rect_x, rect_y, rect_w, rect_h;
294 xy = bytestream2_get_byte(gb);
295 wh = bytestream2_get_byte(gb);
299 rect_w = (wh >> 4) + 1;
300 rect_h = (wh & 0xF) + 1;
302 if (rect_x + rect_w >
w -
i || rect_y + rect_h >
h - j) {
308 rect_w, rect_h, fg, bpp,
stride);
322 c->cur_w =
c->cur_h = 0;
323 c->cur_hx =
c->cur_hy = 0;
330 const uint8_t *buf = avpkt->
data;
331 int buf_size = avpkt->
size;
335 int dx, dy,
w,
h, depth, enc, chunks, res, size_left,
ret;
339 chunks = bytestream2_get_be16(gb);
346 c->pic->key_frame = 0;
353 if (
c->width <
c->cur_x +
w)
354 w =
c->width -
c->cur_x;
356 if (
c->height <
c->cur_y +
h)
357 h =
c->height -
c->cur_y;
368 if ((
w > 0) && (
h > 0)) {
369 outptr =
c->pic->data[0] + dx *
c->bpp2 + dy *
c->pic->linesize[0];
370 for (
i = 0;
i <
h;
i++) {
371 memcpy(outptr,
c->screendta +
i *
c->cur_w *
c->bpp2,
373 outptr +=
c->pic->linesize[0];
383 dx = bytestream2_get_be16(gb);
384 dy = bytestream2_get_be16(gb);
385 w = bytestream2_get_be16(gb);
386 h = bytestream2_get_be16(gb);
387 enc = bytestream2_get_be32(gb);
388 if ((dx +
w >
c->width) || (dy +
h >
c->height)) {
390 "Incorrect frame size: %ix%i+%ix%i of %ix%i\n",
391 w,
h, dx, dy,
c->width,
c->height);
394 outptr =
c->pic->data[0] + dx *
c->bpp2 + dy *
c->pic->linesize[0];
398 if (
w*(int64_t)
h*
c->bpp2 > INT_MAX/2 - 2) {
402 if (size_left < 2 + w * h * c->bpp2 * 2) {
404 "Premature end of data! (need %i got %i)\n",
405 2 +
w *
h *
c->bpp2 * 2, size_left);
413 if ((
c->cur_hx >
c->cur_w) || (
c->cur_hy >
c->cur_h)) {
415 "Cursor hot spot is not in image: "
416 "%ix%i of %ix%i cursor size\n",
417 c->cur_hx,
c->cur_hy,
c->cur_w,
c->cur_h);
418 c->cur_hx =
c->cur_hy = 0;
420 if (
c->cur_w *
c->cur_h >= INT_MAX /
c->bpp2) {
424 int screen_size =
c->cur_w *
c->cur_h *
c->bpp2;
438 c->cur_x = dx -
c->cur_hx;
439 c->cur_y = dy -
c->cur_hy;
448 c->pic->key_frame = 1;
450 depth = bytestream2_get_byte(gb);
451 if (depth !=
c->bpp) {
453 "Depth mismatch. Container %i bpp, "
454 "Frame data: %i bpp\n",
458 c->bigendian = bytestream2_get_byte(gb);
459 if (
c->bigendian & (~1)) {
461 "Invalid header: bigendian flag = %i\n",
c->bigendian);
471 if (size_left < w * h * c->bpp2) {
473 "Premature end of data! (need %i got %i)\n",
474 w *
h *
c->bpp2, size_left);
478 c->pic->linesize[0]);
494 if (
c->width <
c->cur_x +
w)
495 w =
c->width -
c->cur_x;
497 if (
c->height <
c->cur_y +
h)
498 h =
c->height -
c->cur_y;
509 if ((
w > 0) && (
h > 0)) {
510 outptr =
c->pic->data[0] + dx *
c->bpp2 + dy *
c->pic->linesize[0];
511 for (
i = 0;
i <
h;
i++) {
512 memcpy(
c->screendta +
i *
c->cur_w *
c->bpp2, outptr,
514 outptr +=
c->pic->linesize[0];
516 outptr =
c->pic->data[0];
555 c->bpp2 =
c->bpp / 8;
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 be(in the first position) for now. Options ------- Then comes the options array. This is what will define the user accessible options. For example
static av_always_inline void paint_rect(uint8_t *dst, int dx, int dy, int w, int h, int color, int bpp, int stride)
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
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
This structure describes decoded (raw) audio or video data.
static av_cold int decode_end(AVCodecContext *avctx)
static av_cold int decode_init(AVCodecContext *avctx)
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
AVCodec p
The public AVCodec.
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
static int decode_hextile(VmncContext *c, uint8_t *dst, GetByteContext *gb, int w, int h, int stride)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define FF_CODEC_DECODE_CB(func)
static int decode_frame(AVCodecContext *avctx, AVFrame *rframe, int *got_frame, AVPacket *avpkt)
@ AV_PICTURE_TYPE_I
Intra.
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
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
static av_always_inline void paint_raw(uint8_t *dst, int w, int h, GetByteContext *gb, int bpp, int be, int stride)
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
int av_reallocp(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory through a pointer to a pointer.
#define AV_LOG_INFO
Standard information.
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
#define i(width, name, range_min, range_max)
static av_always_inline int vmnc_get_pixel(GetByteContext *gb, int bpp, int be)
#define AV_PIX_FMT_RGB555
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
const char * name
Name of the codec implementation.
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
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.
#define AV_PIX_FMT_0RGB32
static void put_cursor(uint8_t *dst, int stride, VmncContext *c, int dx, int dy)
main external API structure.
static void reset_buffers(VmncContext *c)
@ AV_PICTURE_TYPE_P
Predicted.
static void load_cursor(VmncContext *c)
const FFCodec ff_vmnc_decoder
This structure stores compressed data.
int width
picture width / height.
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
#define flags(name, subs,...)
#define AVERROR_INVALIDDATA
Invalid data found when processing input.