Go to the documentation of this file.
53 thr = ((thr >> 1) + 4 * m->
cum_prob[0]) / thr;
55 return FFMIN(thr, 0x3FFF);
114 for (
i =
val - 1;
i >= 0;
i--)
123 if (!
ctx->special_initial_cache)
124 for (
i = 0;
i <
ctx->cache_size;
i++)
135 for (
i = 0;
i < 15;
i++)
136 for (j = 0; j < 4; j++)
141 int full_model_syms,
int special_initial_cache)
145 ctx->cache_size = cache_size + 4;
146 ctx->num_syms = cache_size;
147 ctx->special_initial_cache = 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)
195 pctx->
cache[0] = pix;
202 uint8_t *
src, ptrdiff_t
stride,
int x,
int y,
205 uint8_t neighbours[4];
213 memset(neighbours,
src[-1], 4);
229 if (x >= 2 &&
src[-2] == neighbours[
LEFT])
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];
276 else if (neighbours[
TOP] == neighbours[
LEFT])
301 rgb_stride = rgb_dst ? rgb_stride : 0;
302 rgb_dst = rgb_dst ? rgb_dst + x * 3 + y * rgb_stride :
NULL;
305 for (j = 0; j <
height; j++) {
332 for (j = y; j < y +
height; j++) {
333 memcpy(
c->rgb_pic + j *
c->rgb_stride + x * 3,
334 c->last_rgb_pic + j *
c->rgb_stride + x * 3,
336 memcpy(
c->pal_pic + j *
c->pal_stride + x,
337 c->last_pal_pic + j *
c->pal_stride + x,
345 if (x +
c->mvX < 0 || x +
c->mvX +
width >
c->avctx->width ||
346 y +
c->mvY < 0 || y +
c->mvY +
height >
c->avctx->height ||
350 uint8_t *dst =
c->pal_pic + x + y *
c->pal_stride;
351 uint8_t *rgb_dst =
c->rgb_pic + x * 3 + y *
c->rgb_stride;
357 if (
c->last_rgb_pic) {
358 src =
c->last_pal_pic + x + y *
c->pal_stride;
359 rgb_src =
c->last_rgb_pic + x * 3 + y *
c->rgb_stride;
361 src =
c->pal_pic + x + y *
c->pal_stride;
362 rgb_src =
c->rgb_pic + x * 3 + y *
c->rgb_stride;
364 for (j = 0; j <
height; j++) {
366 memmove(rgb_dst, rgb_src,
width * 3);
367 dst +=
c->pal_stride;
368 src +=
c->pal_stride;
369 rgb_dst +=
c->rgb_stride;
370 rgb_src +=
c->rgb_stride;
377 uint8_t *dst, ptrdiff_t
stride, uint8_t *
mask,
378 ptrdiff_t mask_stride,
int x,
int y,
383 uint8_t *rgb_dst =
c->rgb_pic + x * 3 + y *
c->rgb_stride;
386 mask += x + y * mask_stride;
388 for (j = 0; j <
height; j++) {
392 !
c->rgb_pic &&
mask[
i] != 0x80 &&
mask[
i] != 0xFF))
395 if (
mask[
i] == 0x02) {
397 }
else if (
mask[
i] == 0x04) {
400 }
else if (
mask[
i] != 0x80) {
415 rgb_dst +=
c->rgb_stride;
422 int version,
int full_model_syms)
433 full_model_syms,
version ? 1 : 0);
455 if ((
base + 1) / 2 - 2 <= 0)
476 int i, j, pix, rgb_pix;
477 ptrdiff_t
stride =
c->pal_stride;
478 ptrdiff_t rgb_stride =
c->rgb_stride;
479 uint8_t *dst =
c->pal_pic + x + y *
stride;
480 uint8_t *rgb_dst =
c->rgb_pic ?
c->rgb_pic + x * 3 + y * rgb_stride :
NULL;
485 rgb_pix =
c->pal[pix];
487 memset(dst, pix,
width);
489 for (j = 0; j <
width * 3; j += 3)
491 rgb_dst += rgb_stride;
517 (
c->rgb_pic &&
mode != 0x01 &&
mode != 0x02 &&
mode != 0x04 ||
518 !
c->rgb_pic &&
mode != 0x80 &&
mode != 0xFF))
523 else if (
mode == 0x04)
525 else if (
mode != 0x80)
533 c->pal_stride,
c->mask,
594 "Insufficient extradata size: expected %"PRIu32
" got %d\n",
617 "Header version doesn't match codec tag\n");
622 if ((
unsigned)
c->free_colours > 256) {
624 "Incorrect number of changeable palette entries: %d\n",
648 "Insufficient extradata size %d for v2\n",
657 if (
c->full_model_syms < 2 ||
c->full_model_syms > 256) {
659 "Incorrect number of used colours %d\n",
667 c->full_model_syms = 256;
670 for (
i = 0;
i < 256;
i++)
683 if (
c->slice_split) {
#define AV_EF_EXPLODE
abort decoding on minor error detection
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 av_cold void slicecontext_init(SliceContext *sc, int version, int full_model_syms)
static const int sec_order_sizes[4]
int16_t weights[MODEL_MAX_SYMS+1]
static av_always_inline int decode_pixel(ArithCoder *acoder, PixContext *pctx, uint8_t *ngb, int num_ngb, int any_ngb)
static int motion_compensation(MSS12Context const *c, int x, int y, int width, int height)
static int decode_pixel_in_context(ArithCoder *acoder, PixContext *pctx, uint8_t *src, ptrdiff_t stride, int x, int y, int has_right)
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 double val(void *priv, double ch)
static void model_rescale_weights(Model *m)
#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 int decode_region_intra(SliceContext *sc, ArithCoder *acoder, int x, int y, int width, int height)
void ff_mss12_model_update(Model *m, int val)
#define FF_PTR_ADD(ptr, off)
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)
uint8_t idx2sym[MODEL_MAX_SYMS+1]
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 int decode_pivot(SliceContext *sc, ArithCoder *acoder, int base)
static int decode_region_inter(SliceContext *sc, ArithCoder *acoder, int x, int y, int width, int height)
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 int decode_region(ArithCoder *acoder, uint8_t *dst, uint8_t *rgb_dst, int x, int y, int width, int height, ptrdiff_t stride, ptrdiff_t rgb_stride, PixContext *pctx, const uint32_t *pal)
static int model_calc_threshold(Model *m)
static av_cold void model_init(Model *m, int num_syms, int thr_weight)
#define i(width, name, range_min, range_max)
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
static void copy_rectangles(MSS12Context const *c, int x, int y, int width, int height)
#define av_malloc_array(a, b)
av_cold int ff_mss12_decode_end(MSS12Context *c)
main external API structure.
static void model_reset(Model *m)
static av_cold void pixctx_init(PixContext *ctx, int cache_size, int full_model_syms, int special_initial_cache)
int ff_mss12_decode_rect(SliceContext *sc, ArithCoder *acoder, int x, int y, int width, int height)
int coded_width
Bitstream width / height, may be different from width/height e.g.
int(* get_number)(struct ArithCoder *c, int n)
void ff_mss12_slicecontext_reset(SliceContext *sc)
int width
picture width / height.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
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
const struct MSS12Context * c
av_cold int ff_mss12_decode_init(MSS12Context *c, int version, SliceContext *sc1, SliceContext *sc2)
int16_t cum_prob[MODEL_MAX_SYMS+1]