-int ff_init_poc(H264Context *h, int pic_field_poc[2], int *pic_poc)
-{
- const int max_frame_num = 1 << h->sps.log2_max_frame_num;
- int field_poc[2];
-
- h->frame_num_offset = h->prev_frame_num_offset;
- if (h->frame_num < h->prev_frame_num)
- h->frame_num_offset += max_frame_num;
-
- if (h->sps.poc_type == 0) {
- const int max_poc_lsb = 1 << h->sps.log2_max_poc_lsb;
-
- if (h->poc_lsb < h->prev_poc_lsb &&
- h->prev_poc_lsb - h->poc_lsb >= max_poc_lsb / 2)
- h->poc_msb = h->prev_poc_msb + max_poc_lsb;
- else if (h->poc_lsb > h->prev_poc_lsb &&
- h->prev_poc_lsb - h->poc_lsb < -max_poc_lsb / 2)
- h->poc_msb = h->prev_poc_msb - max_poc_lsb;
- else
- h->poc_msb = h->prev_poc_msb;
- field_poc[0] =
- field_poc[1] = h->poc_msb + h->poc_lsb;
- if (h->picture_structure == PICT_FRAME)
- field_poc[1] += h->delta_poc_bottom;
- } else if (h->sps.poc_type == 1) {
- int abs_frame_num, expected_delta_per_poc_cycle, expectedpoc;
- int i;
-
- if (h->sps.poc_cycle_length != 0)
- abs_frame_num = h->frame_num_offset + h->frame_num;
- else
- abs_frame_num = 0;
-
- if (h->nal_ref_idc == 0 && abs_frame_num > 0)
- abs_frame_num--;
-
- expected_delta_per_poc_cycle = 0;
- for (i = 0; i < h->sps.poc_cycle_length; i++)
- // FIXME integrate during sps parse
- expected_delta_per_poc_cycle += h->sps.offset_for_ref_frame[i];
-
- if (abs_frame_num > 0) {
- int poc_cycle_cnt = (abs_frame_num - 1) / h->sps.poc_cycle_length;
- int frame_num_in_poc_cycle = (abs_frame_num - 1) % h->sps.poc_cycle_length;
-
- expectedpoc = poc_cycle_cnt * expected_delta_per_poc_cycle;
- for (i = 0; i <= frame_num_in_poc_cycle; i++)
- expectedpoc = expectedpoc + h->sps.offset_for_ref_frame[i];
- } else
- expectedpoc = 0;
-
- if (h->nal_ref_idc == 0)
- expectedpoc = expectedpoc + h->sps.offset_for_non_ref_pic;
-
- field_poc[0] = expectedpoc + h->delta_poc[0];
- field_poc[1] = field_poc[0] + h->sps.offset_for_top_to_bottom_field;
-
- if (h->picture_structure == PICT_FRAME)
- field_poc[1] += h->delta_poc[1];
- } else {
- int poc = 2 * (h->frame_num_offset + h->frame_num);
-
- if (!h->nal_ref_idc)
- poc--;
-
- field_poc[0] = poc;
- field_poc[1] = poc;
- }
-
- if (h->picture_structure != PICT_BOTTOM_FIELD)
- pic_field_poc[0] = field_poc[0];
- if (h->picture_structure != PICT_TOP_FIELD)
- pic_field_poc[1] = field_poc[1];
- *pic_poc = FFMIN(pic_field_poc[0], pic_field_poc[1]);
-
- return 0;
-}
-
-/**
- * Compute profile from profile_idc and constraint_set?_flags.
- *
- * @param sps SPS
- *
- * @return profile as defined by FF_PROFILE_H264_*
- */
-int ff_h264_get_profile(SPS *sps)
-{
- int profile = sps->profile_idc;
-
- switch (sps->profile_idc) {
- case FF_PROFILE_H264_BASELINE:
- // constraint_set1_flag set to 1
- profile |= (sps->constraint_set_flags & 1 << 1) ? FF_PROFILE_H264_CONSTRAINED : 0;
- break;
- case FF_PROFILE_H264_HIGH_10:
- case FF_PROFILE_H264_HIGH_422:
- case FF_PROFILE_H264_HIGH_444_PREDICTIVE:
- // constraint_set3_flag set to 1
- profile |= (sps->constraint_set_flags & 1 << 3) ? FF_PROFILE_H264_INTRA : 0;
- break;
- }
-
- return profile;
-}
-
-int ff_set_ref_count(H264Context *h, H264SliceContext *sl)
-{
- int ref_count[2], list_count;
- int num_ref_idx_active_override_flag;
-
- // set defaults, might be overridden a few lines later
- ref_count[0] = h->pps.ref_count[0];
- ref_count[1] = h->pps.ref_count[1];
-
- if (sl->slice_type_nos != AV_PICTURE_TYPE_I) {
- unsigned max[2];
- max[0] = max[1] = h->picture_structure == PICT_FRAME ? 15 : 31;
-
- if (sl->slice_type_nos == AV_PICTURE_TYPE_B)
- sl->direct_spatial_mv_pred = get_bits1(&sl->gb);
- num_ref_idx_active_override_flag = get_bits1(&sl->gb);
-
- if (num_ref_idx_active_override_flag) {
- ref_count[0] = get_ue_golomb(&sl->gb) + 1;
- if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
- ref_count[1] = get_ue_golomb(&sl->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(h->avctx, AV_LOG_ERROR, "reference overflow %u > %u or %u > %u\n", ref_count[0]-1, max[0], ref_count[1]-1, max[1]);
- sl->ref_count[0] = sl->ref_count[1] = 0;
- sl->list_count = 0;
- return AVERROR_INVALIDDATA;
- }
-
- if (sl->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;
- }
-
- if (list_count != sl->list_count ||
- ref_count[0] != sl->ref_count[0] ||
- ref_count[1] != sl->ref_count[1]) {
- sl->ref_count[0] = ref_count[0];
- sl->ref_count[1] = ref_count[1];
- sl->list_count = list_count;
- return 1;
- }
-
- return 0;
-}
-