pwt->use_weight = pwt->use_weight || pwt->use_weight_chroma;
return 0;
}
+
+/**
+ * Check if the top & left blocks are available if needed and
+ * change the dc mode so it only uses the available blocks.
+ */
+int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
+ int top_samples_available, int left_samples_available)
+{
+ static const int8_t top[12] = {
+ -1, 0, LEFT_DC_PRED, -1, -1, -1, -1, -1, 0
+ };
+ static const int8_t left[12] = {
+ 0, -1, TOP_DC_PRED, 0, -1, -1, -1, 0, -1, DC_128_PRED
+ };
+ int i;
+
+ if (!(top_samples_available & 0x8000)) {
+ for (i = 0; i < 4; i++) {
+ int status = top[pred_mode_cache[scan8[0] + i]];
+ if (status < 0) {
+ av_log(logctx, AV_LOG_ERROR,
+ "top block unavailable for requested intra mode %d\n",
+ status);
+ return AVERROR_INVALIDDATA;
+ } else if (status) {
+ pred_mode_cache[scan8[0] + i] = status;
+ }
+ }
+ }
+
+ if ((left_samples_available & 0x8888) != 0x8888) {
+ static const int mask[4] = { 0x8000, 0x2000, 0x80, 0x20 };
+ for (i = 0; i < 4; i++)
+ if (!(left_samples_available & mask[i])) {
+ int status = left[pred_mode_cache[scan8[0] + 8 * i]];
+ if (status < 0) {
+ av_log(logctx, AV_LOG_ERROR,
+ "left block unavailable for requested intra4x4 mode %d\n",
+ status);
+ return AVERROR_INVALIDDATA;
+ } else if (status) {
+ pred_mode_cache[scan8[0] + 8 * i] = status;
+ }
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * Check if the top & left blocks are available if needed and
+ * change the dc mode so it only uses the available blocks.
+ */
+int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available,
+ int left_samples_available,
+ int mode, int is_chroma)
+{
+ static const int8_t top[4] = { LEFT_DC_PRED8x8, 1, -1, -1 };
+ static const int8_t left[5] = { TOP_DC_PRED8x8, -1, 2, -1, DC_128_PRED8x8 };
+
+ if (mode > 3U) {
+ av_log(logctx, AV_LOG_ERROR,
+ "out of range intra chroma pred mode\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (!(top_samples_available & 0x8000)) {
+ mode = top[mode];
+ if (mode < 0) {
+ av_log(logctx, AV_LOG_ERROR,
+ "top block unavailable for requested intra mode\n");
+ return AVERROR_INVALIDDATA;
+ }
+ }
+
+ if ((left_samples_available & 0x8080) != 0x8080) {
+ mode = left[mode];
+ if (mode < 0) {
+ av_log(logctx, AV_LOG_ERROR,
+ "left block unavailable for requested intra mode\n");
+ return AVERROR_INVALIDDATA;
+ }
+ if (is_chroma && (left_samples_available & 0x8080)) {
+ // mad cow disease mode, aka MBAFF + constrained_intra_pred
+ mode = ALZHEIMER_DC_L0T_PRED8x8 +
+ (!(left_samples_available & 0x8000)) +
+ 2 * (mode == DC_128_PRED8x8);
+ }
+ }
+
+ return mode;
+}
+
+int ff_h264_parse_ref_count(int *plist_count, int ref_count[2],
+ GetBitContext *gb, const PPS *pps,
+ int slice_type_nos, int picture_structure, void *logctx)
+{
+ int list_count;
+ int num_ref_idx_active_override_flag;
+
+ // set defaults, might be overridden a few lines later
+ ref_count[0] = pps->ref_count[0];
+ ref_count[1] = pps->ref_count[1];
+
+ if (slice_type_nos != AV_PICTURE_TYPE_I) {
+ unsigned max[2];
+ max[0] = max[1] = picture_structure == PICT_FRAME ? 15 : 31;
+
+ num_ref_idx_active_override_flag = get_bits1(gb);
+
+ if (num_ref_idx_active_override_flag) {
+ ref_count[0] = get_ue_golomb(gb) + 1;
+ if (slice_type_nos == AV_PICTURE_TYPE_B) {
+ ref_count[1] = get_ue_golomb(gb) + 1;
+ } else
+ // full range is spec-ok in this case, even for frames
+ ref_count[1] = 1;
+ }
+
+ if (ref_count[0] - 1 > max[0] || ref_count[1] - 1 > max[1]) {
+ av_log(logctx, AV_LOG_ERROR, "reference overflow %u > %u or %u > %u\n",
+ ref_count[0] - 1, max[0], ref_count[1] - 1, max[1]);
+ ref_count[0] = ref_count[1] = 0;
+ *plist_count = 0;
+ goto fail;
+ }
+
+ if (slice_type_nos == AV_PICTURE_TYPE_B)
+ list_count = 2;
+ else
+ list_count = 1;
+ } else {
+ list_count = 0;
+ ref_count[0] = ref_count[1] = 0;
+ }
+
+ *plist_count = list_count;
+
+ return 0;
+fail:
+ *plist_count = 0;
+ ref_count[0] = 0;
+ ref_count[1] = 0;
+ return AVERROR_INVALIDDATA;
+}