* check if global motion params is valid. * see spec 7.11.3.6 */
| 177 | * see spec 7.11.3.6 |
| 178 | */ |
| 179 | static uint8_t get_shear_params_valid(AV1DecContext *s, int idx) |
| 180 | { |
| 181 | int16_t alpha, beta, gamma, delta, divf, divs; |
| 182 | int64_t v, w; |
| 183 | int32_t *param = &s->cur_frame.gm_params[idx][0]; |
| 184 | if (param[2] <= 0) |
| 185 | return 0; |
| 186 | |
| 187 | alpha = av_clip_int16(param[2] - (1 << AV1_WARPEDMODEL_PREC_BITS)); |
| 188 | beta = av_clip_int16(param[3]); |
| 189 | divf = resolve_divisor(abs(param[2]), &divs); |
| 190 | v = (int64_t)param[4] * (1 << AV1_WARPEDMODEL_PREC_BITS); |
| 191 | w = (int64_t)param[3] * param[4]; |
| 192 | gamma = av_clip_int16((int)round_two_signed((v * divf), divs)); |
| 193 | delta = av_clip_int16(param[5] - (int)round_two_signed((w * divf), divs) - (1 << AV1_WARPEDMODEL_PREC_BITS)); |
| 194 | |
| 195 | alpha = round_two_signed(alpha, AV1_WARP_PARAM_REDUCE_BITS) << AV1_WARP_PARAM_REDUCE_BITS; |
| 196 | beta = round_two_signed(beta, AV1_WARP_PARAM_REDUCE_BITS) << AV1_WARP_PARAM_REDUCE_BITS; |
| 197 | gamma = round_two_signed(gamma, AV1_WARP_PARAM_REDUCE_BITS) << AV1_WARP_PARAM_REDUCE_BITS; |
| 198 | delta = round_two_signed(delta, AV1_WARP_PARAM_REDUCE_BITS) << AV1_WARP_PARAM_REDUCE_BITS; |
| 199 | |
| 200 | if ((4 * abs(alpha) + 7 * abs(beta)) >= (1 << AV1_WARPEDMODEL_PREC_BITS) || |
| 201 | (4 * abs(gamma) + 4 * abs(delta)) >= (1 << AV1_WARPEDMODEL_PREC_BITS)) |
| 202 | return 0; |
| 203 | |
| 204 | return 1; |
| 205 | } |
| 206 | |
| 207 | /** |
| 208 | * update gm type/params, since cbs already implemented part of this function, |
no test coverage detected