53 thr = ((thr >> 1) + 4 * m->
cum_prob[0]) / thr;
55 return FFMIN(thr, 0x3FFF);
114 for (i = val - 1; i >= 0; i--)
135 for (
i = 0;
i < 15;
i++)
136 for (j = 0; j < 4; j++)
141 int full_model_syms,
int special_initial_cache)
152 for (i = 0, idx = 0; i < 4; i++)
154 for (k = 0; k < 4; k++)
160 uint8_t *ngb,
int num_ngb,
int any_ngb)
167 if (val < pctx->num_syms) {
173 for (j = 0; j < num_ngb; j++)
174 if (pctx->
cache[i] == ngb[j])
188 if (pctx->
cache[i] == pix)
193 for (i = val; i > 0; i--)
195 pctx->
cache[0] = pix;
213 memset(neighbours, src[-1], 4);
219 neighbours[
TOP_LEFT] = src[-stride - 1];
220 neighbours[
LEFT] = src[-1];
223 neighbours[
TOP_RIGHT] = src[-stride + 1];
229 if (x >= 2 && src[-2] == neighbours[
LEFT])
231 if (y >= 2 && src[-2 * stride] == neighbours[
TOP])
235 ref_pix[0] = neighbours[0];
236 for (i = 1; i < 4; i++) {
237 for (j = 0; j < nlen; j++)
238 if (ref_pix[j] == neighbours[i])
241 ref_pix[nlen++] = neighbours[
i];
249 if (neighbours[TOP] == neighbours[
TOP_LEFT]) {
250 if (neighbours[
TOP_RIGHT] == neighbours[TOP_LEFT])
252 else if (neighbours[LEFT] == neighbours[TOP_LEFT])
256 }
else if (neighbours[
TOP_RIGHT] == neighbours[TOP_LEFT]) {
257 if (neighbours[LEFT] == neighbours[TOP_LEFT])
261 }
else if (neighbours[LEFT] == neighbours[TOP_LEFT]) {
268 if (neighbours[TOP] == neighbours[TOP_LEFT])
270 else if (neighbours[
TOP_RIGHT] == neighbours[TOP_LEFT])
272 else if (neighbours[LEFT] == neighbours[TOP_LEFT])
274 else if (neighbours[
TOP_RIGHT] == neighbours[TOP])
276 else if (neighbours[TOP] == neighbours[LEFT])
300 uint8_t *rgb_dst = rgb_pic + x * 3 + y * rgb_stride;
304 for (j = 0; j <
height; j++) {
305 for (i = 0; i <
width; i++) {
310 i, j, width - i - 1);
316 AV_WB24(rgb_dst + i * 3, pal[p]);
319 rgb_dst += rgb_stride;
331 for (j = y; j < y +
height; j++) {
363 for (j = 0; j <
height; j++) {
364 memmove(dst, src, width);
365 memmove(rgb_dst, rgb_src, width * 3);
377 ptrdiff_t mask_stride,
int x,
int y,
385 mask += x + y * mask_stride;
387 for (j = 0; j <
height; j++) {
388 for (i = 0; i <
width; i++) {
390 ( c->
rgb_pic && mask[i] != 0x01 && mask[i] != 0x02 && mask[i] != 0x04 ||
391 !c->
rgb_pic && mask[i] != 0x80 && mask[i] != 0xFF))
394 if (mask[i] == 0x02) {
396 }
else if (mask[i] == 0x04) {
399 }
else if (mask[i] != 0x80) {
404 i, j, width - i - 1);
421 int version,
int full_model_syms)
432 full_model_syms, version ? 1 : 0);
454 if ((base + 1) / 2 - 2 <= 0)
457 val = acoder->
get_number(acoder, (base + 1) / 2 - 2) + 3;
460 if ((
unsigned)val >= base)
463 return inv ? base - val :
val;
475 int i, j, pix, rgb_pix;
484 rgb_pix = c->
pal[pix];
485 for (i = 0; i <
height; i++, dst +=
stride, rgb_dst += rgb_stride) {
486 memset(dst, pix, width);
488 for (j = 0; j < width * 3; j += 3)
514 ( c->
rgb_pic && mode != 0x01 && mode != 0x02 && mode != 0x04 ||
515 !c->
rgb_pic && mode != 0x80 && mode != 0xFF))
520 else if (mode == 0x04)
522 else if (mode != 0x80)
591 "Insufficient extradata size: expected %"PRIu32
" got %d\n",
614 "Header version doesn't match codec tag\n");
621 "Incorrect number of changeable palette entries: %d\n",
645 "Insufficient extradata size %d for v2\n",
656 "Incorrect number of used colours %d\n",
667 for (i = 0; i < 256; i++)
669 (version ? 8 : 0) + i * 3);
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
int(* get_number)(struct ArithCoder *c, int n)
int coded_width
Bitstream width / height, may be different from width/height e.g.
av_cold int ff_mss12_decode_init(MSS12Context *c, int version, SliceContext *sc1, SliceContext *sc2)
int(* get_model_sym)(struct ArithCoder *c, Model *m)
static av_always_inline float av_int2float(uint32_t i)
Reinterpret a 32-bit integer as a float.
static void pixctx_reset(PixContext *ctx)
static int decode_region_inter(SliceContext *sc, ArithCoder *acoder, int x, int y, int width, int height)
int16_t weights[MODEL_MAX_SYMS+1]
int ff_mss12_decode_rect(SliceContext *sc, ArithCoder *acoder, int x, int y, int width, int height)
static const int sec_order_sizes[4]
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
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
static av_cold void slicecontext_init(SliceContext *sc, int version, int full_model_syms)
static int decode_region_intra(SliceContext *sc, ArithCoder *acoder, int x, int y, int width, int height)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static const uint16_t mask[17]
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
static void model_rescale_weights(Model *m)
static int decode_pivot(SliceContext *sc, ArithCoder *acoder, int base)
static av_cold void pixctx_init(PixContext *ctx, int cache_size, int full_model_syms, int special_initial_cache)
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
static int model_calc_threshold(Model *m)
static int motion_compensation(MSS12Context const *c, int x, int y, int width, int height)
int width
picture width / height.
#define AV_EF_EXPLODE
abort decoding on minor error detection
av_cold int ff_mss12_decode_end(MSS12Context *c)
Libavcodec external API header.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_RB24
main external API structure.
uint8_t idx2sym[MODEL_MAX_SYMS+1]
static int decode_pixel_in_context(ArithCoder *acoder, PixContext *pctx, uint8_t *src, ptrdiff_t stride, int x, int y, int has_right)
int special_initial_cache
static av_cold void model_init(Model *m, int num_syms, int thr_weight)
static void model_reset(Model *m)
GLint GLenum GLboolean GLsizei stride
void ff_mss12_slicecontext_reset(SliceContext *sc)
static av_always_inline int decode_pixel(ArithCoder *acoder, PixContext *pctx, uint8_t *ngb, int num_ngb, int any_ngb)
static int decode_region_masked(MSS12Context const *c, ArithCoder *acoder, uint8_t *dst, ptrdiff_t stride, uint8_t *mask, ptrdiff_t mask_stride, int x, int y, int width, int height, PixContext *pctx)
void ff_mss12_model_update(Model *m, int val)
static int decode_region(ArithCoder *acoder, uint8_t *dst, uint8_t *rgb_pic, int x, int y, int width, int height, ptrdiff_t stride, ptrdiff_t rgb_stride, PixContext *pctx, const uint32_t *pal)
static float sub(float src0, float src1)
#define av_malloc_array(a, b)
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
static double val(void *priv, double ch)
mode
Use these values in ebur128_init (or'ed).
static void copy_rectangles(MSS12Context const *c, int x, int y, int width, int height)
int16_t cum_prob[MODEL_MAX_SYMS+1]
Common header for Microsoft Screen 1 and 2.