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https://github.com/xenia-project/FFmpeg.git
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mss12: reduce SliceContext size from 1067 to 164 KB
Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>
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@ -89,7 +89,7 @@ static int arith_get_number(ArithCoder *c, int mod_val)
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return val;
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}
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static int arith_get_prob(ArithCoder *c, int *probs)
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static int arith_get_prob(ArithCoder *c, int16_t *probs)
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{
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int range = c->high - c->low + 1;
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int val = ((c->value - c->low + 1) * probs[0] - 1) / range;
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@ -61,13 +61,9 @@ static void model_reset(Model *m)
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m->weights[i] = 1;
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m->cum_prob[i] = m->num_syms - i;
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}
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m->weights[0] = -1;
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m->idx2sym[0] = -1;
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m->sym2idx[m->num_syms] = -1;
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for (i = 0; i < m->num_syms; i++) {
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m->sym2idx[i] = i + 1;
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m->weights[0] = 0;
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for (i = 0; i < m->num_syms; i++)
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m->idx2sym[i + 1] = i;
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}
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}
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static av_cold void model_init(Model *m, int num_syms, int thr_weight)
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@ -75,7 +71,6 @@ static av_cold void model_init(Model *m, int num_syms, int thr_weight)
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m->num_syms = num_syms;
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m->thr_weight = thr_weight;
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m->threshold = num_syms * thr_weight;
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model_reset(m);
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}
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static void model_rescale_weights(Model *m)
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@ -109,8 +104,6 @@ void ff_mss12_model_update(Model *m, int val)
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m->idx2sym[val] = sym2;
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m->idx2sym[i] = sym1;
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m->sym2idx[sym1] = i;
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m->sym2idx[sym2] = val;
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val = i;
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}
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@ -123,7 +116,7 @@ void ff_mss12_model_update(Model *m, int val)
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static void pixctx_reset(PixContext *ctx)
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{
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int i, j, k;
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int i, j;
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if (!ctx->special_initial_cache)
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for (i = 0; i < ctx->cache_size; i++)
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@ -137,16 +130,15 @@ static void pixctx_reset(PixContext *ctx)
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model_reset(&ctx->cache_model);
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model_reset(&ctx->full_model);
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for (i = 0; i < 4; i++)
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for (j = 0; j < sec_order_sizes[i]; j++)
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for (k = 0; k < 4; k++)
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model_reset(&ctx->sec_models[i][j][k]);
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for (i = 0; i < 15; i++)
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for (j = 0; j < 4; j++)
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model_reset(&ctx->sec_models[i][j]);
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}
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static av_cold void pixctx_init(PixContext *ctx, int cache_size,
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int full_model_syms, int special_initial_cache)
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{
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int i, j, k;
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int i, j, k, idx;
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ctx->cache_size = cache_size + 4;
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ctx->num_syms = cache_size;
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@ -155,10 +147,10 @@ static av_cold void pixctx_init(PixContext *ctx, int cache_size,
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model_init(&ctx->cache_model, ctx->num_syms + 1, THRESH_LOW);
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model_init(&ctx->full_model, full_model_syms, THRESH_HIGH);
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for (i = 0; i < 4; i++)
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for (j = 0; j < sec_order_sizes[i]; j++)
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for (i = 0, idx = 0; i < 4; i++)
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for (j = 0; j < sec_order_sizes[i]; j++, idx++)
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for (k = 0; k < 4; k++)
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model_init(&ctx->sec_models[i][j][k], 2 + i,
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model_init(&ctx->sec_models[idx][k], 2 + i,
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i ? THRESH_LOW : THRESH_ADAPTIVE);
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}
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@ -268,46 +260,48 @@ static int decode_pixel_in_context(ArithCoder *acoder, PixContext *pctx,
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switch (nlen) {
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case 1:
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case 4:
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layer = 0;
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break;
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case 2:
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if (neighbours[TOP] == neighbours[TOP_LEFT]) {
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if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT])
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layer = 3;
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layer = 1;
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else if (neighbours[LEFT] == neighbours[TOP_LEFT])
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layer = 2;
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else
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layer = 4;
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layer = 3;
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} else if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT]) {
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if (neighbours[LEFT] == neighbours[TOP_LEFT])
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layer = 1;
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layer = 4;
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else
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layer = 5;
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} else if (neighbours[LEFT] == neighbours[TOP_LEFT]) {
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layer = 6;
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} else {
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layer = 0;
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layer = 7;
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}
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break;
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case 3:
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if (neighbours[TOP] == neighbours[TOP_LEFT])
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layer = 0;
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layer = 8;
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else if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT])
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layer = 1;
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layer = 9;
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else if (neighbours[LEFT] == neighbours[TOP_LEFT])
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layer = 2;
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layer = 10;
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else if (neighbours[TOP_RIGHT] == neighbours[TOP])
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layer = 3;
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layer = 11;
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else if (neighbours[TOP] == neighbours[LEFT])
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layer = 4;
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layer = 12;
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else
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layer = 5;
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layer = 13;
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break;
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case 4:
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layer = 14;
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break;
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}
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pix = acoder->get_model_sym(acoder,
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&pctx->sec_models[nlen - 1][layer][sub]);
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&pctx->sec_models[layer][sub]);
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if (pix < nlen)
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return ref_pix[pix];
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else
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@ -38,10 +38,9 @@
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#define THRESH_HIGH 50
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typedef struct Model {
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int cum_prob[MODEL_MAX_SYMS + 1];
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int weights[MODEL_MAX_SYMS + 1];
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int idx2sym[MODEL_MAX_SYMS + 1];
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int sym2idx[MODEL_MAX_SYMS + 1];
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int16_t cum_prob[MODEL_MAX_SYMS + 1];
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int16_t weights[MODEL_MAX_SYMS + 1];
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uint8_t idx2sym[MODEL_MAX_SYMS + 1];
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int num_syms;
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int thr_weight, threshold;
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} Model;
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@ -60,7 +59,7 @@ typedef struct PixContext {
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int cache_size, num_syms;
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uint8_t cache[12];
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Model cache_model, full_model;
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Model sec_models[4][8][4];
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Model sec_models[15][4];
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int special_initial_cache;
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} PixContext;
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@ -106,7 +106,7 @@ static int arith2_get_number(ArithCoder *c, int n)
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return val;
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}
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static int arith2_get_prob(ArithCoder *c, int *probs)
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static int arith2_get_prob(ArithCoder *c, int16_t *probs)
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{
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int range = c->high - c->low + 1, n = *probs;
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int scale = av_log2(range) - av_log2(n);
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