AVC: Added several steps in slice decoding process (8.2) (#208)
* * rocDecode/AVC: Added decode picture callback from parser to decoder and VAAPI decode submission. * * rocDecode/AVC: Minor changes based on code review comments. * * rocDecode/AVC: Removed a redundant line. * * rocDecode/AVC: Added picture order count calculation. * * rocDecode/AVC: Added initial implementation of reference list setup. * * rocDecode/AVC: Added decoded reference picture marking. * * rocDecode/AVC: Minor changes based on code review.
This commit is contained in:
jeffqjiangNew
GitHub
+375
-3
@@ -24,6 +24,11 @@ THE SOFTWARE.
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#include "avc_parser.h"
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AvcVideoParser::AvcVideoParser() {
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prev_pic_order_cnt_msb_ = 0;
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prev_pic_order_cnt_lsb_ = 0;
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prev_top_field_order_cnt_ = 0;
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prev_frame_num_offset_t = 0;
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prev_frame_num_ = 0;
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prev_has_mmco_5_ = 0;
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curr_has_mmco_5_ = 0;
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prev_ref_pic_bottom_field_ = 0;
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@@ -134,7 +139,28 @@ ParserResult AvcVideoParser::ParsePictureData(const uint8_t *p_stream, uint32_t
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ParseSliceHeader(rbsp_buf_, rbsp_size_, &slice_header_0_);
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// Start decode process
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// Todo
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// Set current picture properties
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CalculateCurrPoc(); // 8.2.1
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prev_has_mmco_5_ = curr_has_mmco_5_;
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prev_ref_pic_bottom_field_ = curr_ref_pic_bottom_field_;
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if (slice_header_0_.field_pic_flag) {
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if (slice_header_0_.bottom_field_flag) {
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curr_pic_.pic_structure = kBottomField;
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} else {
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curr_pic_.pic_structure = kTopField;
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}
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} else {
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curr_pic_.pic_structure = kFrame;
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}
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curr_pic_.frame_num = slice_header_0_.frame_num;
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// Set up reference picture list
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if (slice_header_0_.slice_type != kAvcSliceTypeI && slice_header_0_.slice_type != kAvcSliceTypeSI && slice_header_0_.slice_type != kAvcSliceTypeI_7 && slice_header_0_.slice_type != kAvcSliceTypeSI_9) {
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SetupReflist();
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}
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// Decoded reference picture marking
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MarkDecodedRefPic();
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}
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slice_num_++;
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break;
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@@ -497,7 +523,6 @@ ParserResult AvcVideoParser::SendPicForDecode() {
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}
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}
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AvcNalUnitHeader AvcVideoParser::ParseNalUnitHeader(uint8_t header_byte) {
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size_t bit_offset = 0;
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AvcNalUnitHeader nal_header;
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@@ -710,7 +735,6 @@ void AvcVideoParser::ParseSps(uint8_t *p_stream, size_t size) {
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p_sps->pic_order_cnt_type = Parser::ExpGolomb::ReadUe(p_stream, offset);
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if (p_sps->pic_order_cnt_type == 0 ) {
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p_sps->log2_max_pic_order_cnt_lsb_minus4 = Parser::ExpGolomb::ReadUe(p_stream, offset);
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//MaxPicOrderCntLsb = pow(2, p_sps->log2_max_pic_order_cnt_lsb_minus4 + 4);
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} else if (p_sps->pic_order_cnt_type == 1) {
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p_sps->delta_pic_order_always_zero_flag = Parser::GetBit(p_stream, offset);
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p_sps->offset_for_non_ref_pic = Parser::ExpGolomb::ReadSe(p_stream, offset);
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@@ -1375,6 +1399,354 @@ bool AvcVideoParser::MoreRbspData(uint8_t *p_stream, size_t stream_size_in_byte,
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return more_rbsp_bits;
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}
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// 8.2.1
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void AvcVideoParser::CalculateCurrPoc() {
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AvcSeqParameterSet *p_sps = &sps_list_[active_sps_id_];
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AvcSliceHeader *p_slice_header = &slice_header_0_;
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int frame_num_offset; // FrameNumOffset
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int max_pic_order_cnt_lsb = 1 << (p_sps->log2_max_pic_order_cnt_lsb_minus4 + 4); // MaxPicOrderCntLsb
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int max_frame_num = 1 << (p_sps->log2_max_frame_num_minus4 + 4); // max_frame_num
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if (p_sps->pic_order_cnt_type == 0) {
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if (slice_nal_unit_header_.nal_unit_type == kAvcNalTypeSlice_IDR) {
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prev_pic_order_cnt_msb_ = 0;
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prev_pic_order_cnt_lsb_ = 0;
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} else {
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if (prev_has_mmco_5_) {
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if (prev_ref_pic_bottom_field_) {
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prev_pic_order_cnt_msb_ = 0;
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prev_pic_order_cnt_lsb_ = 0;
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} else {
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prev_pic_order_cnt_msb_ = 0;
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prev_pic_order_cnt_lsb_ = prev_top_field_order_cnt_;
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}
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}
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}
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int pic_order_cnt_msb;
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if ( (p_slice_header->pic_order_cnt_lsb < prev_pic_order_cnt_lsb_) && ((prev_pic_order_cnt_lsb_ - p_slice_header->pic_order_cnt_lsb) >= (max_pic_order_cnt_lsb / 2))) {
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pic_order_cnt_msb = prev_pic_order_cnt_msb_ + max_pic_order_cnt_lsb;
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} else if ((p_slice_header->pic_order_cnt_lsb > prev_pic_order_cnt_lsb_) && ( (p_slice_header->pic_order_cnt_lsb - prev_pic_order_cnt_lsb_) > (max_pic_order_cnt_lsb / 2))) {
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pic_order_cnt_msb = prev_pic_order_cnt_msb_ - max_pic_order_cnt_lsb;
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} else {
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pic_order_cnt_msb = prev_pic_order_cnt_msb_;
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}
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if (!p_slice_header->field_pic_flag || !p_slice_header->bottom_field_flag) {
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curr_pic_.top_field_order_cnt = pic_order_cnt_msb + p_slice_header->pic_order_cnt_lsb;
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}
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if (!p_slice_header->field_pic_flag) {
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curr_pic_.bottom_field_order_cnt = curr_pic_.top_field_order_cnt + p_slice_header->delta_pic_order_cnt_bottom;
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} else if (p_slice_header->bottom_field_flag) {
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curr_pic_.bottom_field_order_cnt = pic_order_cnt_msb + p_slice_header->pic_order_cnt_lsb;
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}
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if (slice_nal_unit_header_.nal_ref_idc) {
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prev_pic_order_cnt_msb_ = pic_order_cnt_msb;
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prev_pic_order_cnt_lsb_ = p_slice_header->pic_order_cnt_lsb;
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prev_top_field_order_cnt_ = curr_pic_.top_field_order_cnt;
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}
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} else if (p_sps->pic_order_cnt_type == 1) {
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int abs_frame_num; // absFrameNum
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if (slice_nal_unit_header_.nal_unit_type == kAvcNalTypeSlice_IDR){
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frame_num_offset = 0;
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} else {
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if (prev_has_mmco_5_) {
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prev_frame_num_offset_t = 0;
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prev_frame_num_ = 0;
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}
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if (prev_frame_num_ > p_slice_header->frame_num) {
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frame_num_offset = prev_frame_num_offset_t + max_frame_num;
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} else {
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frame_num_offset = prev_frame_num_offset_t;
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}
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}
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if (p_sps->num_ref_frames_in_pic_order_cnt_cycle) {
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abs_frame_num = frame_num_offset + p_slice_header->frame_num;
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} else {
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abs_frame_num = 0;
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}
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if ((!slice_nal_unit_header_.nal_ref_idc) && abs_frame_num > 0) {
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abs_frame_num--;
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}
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int expected_delta_per_pic_order_cnt_cycle = 0; // ExpectedDeltaPerPicOrderCntCycle
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if (p_sps->num_ref_frames_in_pic_order_cnt_cycle) {
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for (int i = 0; i < p_sps->num_ref_frames_in_pic_order_cnt_cycle; i++) {
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expected_delta_per_pic_order_cnt_cycle += p_sps->offset_for_ref_frame[i];
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}
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}
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int expected_pic_order_cnt; // expectedPicOrderCnt
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if( abs_frame_num > 0 ) {
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int pic_order_cnt_cycle_cnt = (abs_frame_num - 1) / p_sps->num_ref_frames_in_pic_order_cnt_cycle; // picOrderCntCycleCnt
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int frame_num_in_pic_order_cnt_cycle = (abs_frame_num - 1) % p_sps->num_ref_frames_in_pic_order_cnt_cycle; // frameNumInPicOrderCntCycle
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expected_pic_order_cnt = pic_order_cnt_cycle_cnt * expected_delta_per_pic_order_cnt_cycle;
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for (int i = 0; i <= frame_num_in_pic_order_cnt_cycle; i++) {
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expected_pic_order_cnt += p_sps->offset_for_ref_frame[i];
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}
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} else {
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expected_pic_order_cnt = 0;
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}
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if (!slice_nal_unit_header_.nal_ref_idc ) {
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expected_pic_order_cnt += p_sps->offset_for_non_ref_pic;
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}
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if (!p_slice_header->field_pic_flag) {
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curr_pic_.top_field_order_cnt = expected_pic_order_cnt + p_slice_header->delta_pic_order_cnt[0];
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curr_pic_.bottom_field_order_cnt = curr_pic_.top_field_order_cnt + p_sps->offset_for_top_to_bottom_field + p_slice_header->delta_pic_order_cnt[1];
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} else if (p_slice_header->bottom_field_flag) {
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curr_pic_.bottom_field_order_cnt = expected_pic_order_cnt + p_sps->offset_for_top_to_bottom_field + p_slice_header->delta_pic_order_cnt[0];
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} else {
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curr_pic_.top_field_order_cnt = expected_pic_order_cnt + p_slice_header->delta_pic_order_cnt[0];
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}
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prev_frame_num_ = p_slice_header->frame_num;
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prev_frame_num_offset_t = frame_num_offset;
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} else if (p_sps->pic_order_cnt_type == 2) {
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if (slice_nal_unit_header_.nal_unit_type == kAvcNalTypeSlice_IDR) {
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frame_num_offset = 0;
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curr_pic_.top_field_order_cnt = 0;
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curr_pic_.bottom_field_order_cnt = 0;
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} else {
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if (prev_has_mmco_5_) {
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prev_frame_num_offset_t = 0;
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}
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if (prev_frame_num_ > p_slice_header->frame_num) {
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frame_num_offset = prev_frame_num_offset_t + max_frame_num;
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} else {
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frame_num_offset = prev_frame_num_offset_t;
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}
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int temp_pic_order_cnt; // tempPicOrderCnt
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if (slice_nal_unit_header_.nal_ref_idc == 0) {
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temp_pic_order_cnt = 2 * (frame_num_offset + p_slice_header->frame_num) - 1;
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} else {
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temp_pic_order_cnt = 2 * (frame_num_offset + p_slice_header->frame_num);
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}
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if (!p_slice_header->field_pic_flag) {
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curr_pic_.top_field_order_cnt = temp_pic_order_cnt;
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curr_pic_.bottom_field_order_cnt = temp_pic_order_cnt;
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} else if (p_slice_header->bottom_field_flag) {
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curr_pic_.bottom_field_order_cnt = temp_pic_order_cnt;
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} else {
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curr_pic_.top_field_order_cnt = temp_pic_order_cnt;
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}
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}
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prev_frame_num_ = p_slice_header->frame_num;
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prev_frame_num_offset_t = frame_num_offset;
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}
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if (p_slice_header->field_pic_flag) {
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curr_pic_.pic_order_cnt = p_slice_header->bottom_field_flag ? curr_pic_.bottom_field_order_cnt : curr_pic_.top_field_order_cnt;
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} else {
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curr_pic_.pic_order_cnt = curr_pic_.top_field_order_cnt <= curr_pic_.bottom_field_order_cnt ? curr_pic_.top_field_order_cnt : curr_pic_.bottom_field_order_cnt;
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}
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}
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// 8.2.4
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static inline int ComparePicNumDesc(const void *p_pic_info_1, const void *p_pic_info_2) {
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int pic_num_1 = ((AvcVideoParser::AvcPicture*)p_pic_info_1)->pic_num;
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int pic_num_2 = ((AvcVideoParser::AvcPicture*)p_pic_info_2)->pic_num;
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if (pic_num_1 < pic_num_2) {
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return 1;
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}
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if (pic_num_1 > pic_num_2) {
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return -1;
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} else {
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return 0;
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}
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}
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static inline int CompareLongTermPicNumAsc(const void *p_pic_info_1, const void *p_pic_info_2) {
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int long_term_pic_num_1 = ((AvcVideoParser::AvcPicture*)p_pic_info_1)->long_term_pic_num;
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int long_term_pic_num_2 = ((AvcVideoParser::AvcPicture*)p_pic_info_2)->long_term_pic_num;
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if (long_term_pic_num_1 < long_term_pic_num_2) {
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return -1;
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}
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if (long_term_pic_num_1 > long_term_pic_num_2) {
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return 1;
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} else {
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return 0;
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}
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}
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void AvcVideoParser::SetupReflist() {
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AvcSeqParameterSet *p_sps = &sps_list_[active_sps_id_];
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int max_frame_num = 1 << (p_sps->log2_max_frame_num_minus4 + 4);
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AvcSliceHeader *p_slice_header = &slice_header_0_;
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int i;
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// 8.2.4.1. Calculate picture numbers
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for (i = 0; i < AVC_MAX_DPB_FRAMES; i++) {
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AvcPicture *p_ref_pic = &dpb_buffer_.frame_buffer_list[i];
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if (p_ref_pic->is_reference == kUsedForShortTerm) {
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p_ref_pic->frame_num = p_ref_pic->frame_num;
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// Eq. 8-27
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if (p_ref_pic->frame_num > curr_pic_.frame_num) {
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p_ref_pic->frame_num_wrap = p_ref_pic->frame_num - max_frame_num;
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} else {
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p_ref_pic->frame_num_wrap = p_ref_pic->frame_num;
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}
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if (curr_pic_.pic_structure == kFrame) {
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p_ref_pic->pic_num = p_ref_pic->frame_num_wrap; // Eq. 8-28
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} else if (((curr_pic_.pic_structure == kTopField) && (p_ref_pic->pic_structure == kTopField)) || ((curr_pic_.pic_structure == kBottomField) && (p_ref_pic->pic_structure == kBottomField))) {
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p_ref_pic->pic_num = 2 * p_ref_pic->frame_num_wrap + 1; // Eq. 8-30
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} else {
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p_ref_pic->pic_num = 2 * p_ref_pic->frame_num_wrap; // Eq. 8-31
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}
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} else if (p_ref_pic->is_reference == kUsedForLongTerm) {
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// Note: Todo: assign long_term_frame_idx in MarkDecodedRefPic()
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if (curr_pic_.pic_structure == kFrame) {
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p_ref_pic->long_term_pic_num = p_ref_pic->long_term_frame_idx; // Eq. 8-29
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} else if (((curr_pic_.pic_structure == kTopField) && (p_ref_pic->pic_structure == kTopField)) || ((curr_pic_.pic_structure == kBottomField) && (p_ref_pic->pic_structure == kBottomField))) {
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p_ref_pic->long_term_pic_num = 2 * p_ref_pic->long_term_frame_idx + 1; // Eq. 8-32
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} else {
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p_ref_pic->long_term_pic_num = 2 * p_ref_pic->long_term_frame_idx; // Eq. 8-33
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}
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}
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}
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// 8.2.4.2 Initialisation process for reference picture lists
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if (p_slice_header->slice_type == kAvcSliceTypeP || p_slice_header->slice_type == kAvcSliceTypeP_5) {
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if (curr_pic_.pic_structure == kFrame) {
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// Group short term ref pictures
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int ref_index = 0;
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for (i = 0; i < AVC_MAX_DPB_FRAMES; i++) {
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AvcPicture *p_ref_pic = &dpb_buffer_.frame_buffer_list[i];
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if (p_ref_pic->is_reference == kUsedForShortTerm) {
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ref_list_0_[ref_index] = *p_ref_pic;
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ref_index++;
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}
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}
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// Group long term ref pictures
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for (i = 0; i < AVC_MAX_DPB_FRAMES; i++) {
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AvcPicture *p_ref_pic = &dpb_buffer_.frame_buffer_list[i];
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if (p_ref_pic->is_reference == kUsedForLongTerm) {
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ref_list_0_[ref_index] = *p_ref_pic;
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ref_index++;
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}
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}
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// Sort short term refs with descending order of pic_num
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if (dpb_buffer_.num_short_term) {
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qsort((void*)ref_list_0_, dpb_buffer_.num_short_term, sizeof(AvcPicture), ComparePicNumDesc);
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}
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// Sort long term refs with ascending order of long_term_pic_num
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if (dpb_buffer_.num_long_term) {
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qsort((void*)&ref_list_0_[dpb_buffer_.num_short_term], dpb_buffer_.num_long_term, sizeof(AvcPicture), CompareLongTermPicNumAsc);
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}
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} else {
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std::cout << "Error!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Todo: Add P ref field list init." << std::endl;
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}
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} else {
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std::cout << "Error!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Todo: Add B ref list init." << std::endl;
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}
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// 8.2.4.3 Modification process for reference picture lists
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if (p_slice_header->ref_pic_list.ref_pic_list_modification_flag_l0 == 1) {
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std::cout << "Error! Todo: Added ref list 0 modification support." << std::endl;
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}
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if (p_slice_header->slice_type == kAvcSliceTypeB || p_slice_header->slice_type == kAvcSliceTypeB_6) {
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if (p_slice_header->ref_pic_list.ref_pic_list_modification_flag_l1 == 1) {
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std::cout << "Error!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Todo: Added ref list 1 modification support." << std::endl;
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}
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}
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}
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ParserResult AvcVideoParser::MarkDecodedRefPic() {
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AvcSeqParameterSet *p_sps = &sps_list_[active_sps_id_];
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AvcSliceHeader *p_slice_header = &slice_header_0_;
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int i;
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if (slice_nal_unit_header_.nal_ref_idc == 0) {
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return PARSER_OK;
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}
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if (slice_nal_unit_header_.nal_unit_type == kAvcNalTypeSlice_IDR) { // 8.2.5.1: 1. & 2.
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// Mark all reference pictures as "unused for reference
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for (i = 0; i < AVC_MAX_DPB_FRAMES; i++) {
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dpb_buffer_.frame_buffer_list[i].is_reference = kUnusedForReference;
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}
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if (p_slice_header->dec_ref_pic_marking.long_term_reference_flag) {
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curr_pic_.is_reference = kUsedForLongTerm;
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curr_pic_.long_term_frame_idx = 0;
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dpb_buffer_.num_long_term = 0;
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} else {
|
||||
curr_pic_.is_reference = kUsedForShortTerm;
|
||||
dpb_buffer_.num_short_term = 0;
|
||||
}
|
||||
} else {
|
||||
if (p_slice_header->dec_ref_pic_marking.adaptive_ref_pic_marking_mode_flag == 1) {
|
||||
std::cout << "Error!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Todo: 8.2.5.4 ............" << std::endl;
|
||||
} else { // 8.2.5.3
|
||||
curr_pic_.is_reference = kUsedForShortTerm; // 8.2.5.1: 3.
|
||||
|
||||
if (dpb_buffer_.num_short_term + dpb_buffer_.num_long_term == p_sps->max_num_ref_frames) {
|
||||
int32_t min_frame_num_wrap = 0xFFFFFF; // more than the largest possible value of FrameNumWrap (2 ^ 16)
|
||||
int min_index = AVC_MAX_DPB_FRAMES;
|
||||
for (i = 0; i < AVC_MAX_DPB_FRAMES; i++) {
|
||||
if (dpb_buffer_.frame_buffer_list[i].is_reference == kUsedForShortTerm) {
|
||||
if (dpb_buffer_.frame_buffer_list[i].frame_num_wrap < min_frame_num_wrap) {
|
||||
min_frame_num_wrap = dpb_buffer_.frame_buffer_list[i].frame_num_wrap;
|
||||
min_index = i;
|
||||
}
|
||||
}
|
||||
}
|
||||
if (min_index < AVC_MAX_DPB_FRAMES) {
|
||||
dpb_buffer_.frame_buffer_list[min_index].is_reference = kUnusedForReference;
|
||||
// Todo: implement output policy
|
||||
dpb_buffer_.frame_buffer_list[min_index].use_status = 0;
|
||||
} else {
|
||||
ERR("Could not find any short term ref picture.");
|
||||
return PARSER_FAIL;
|
||||
}
|
||||
dpb_buffer_.num_short_term--;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Look for an empty frame buffer in DPB and add the current ref picture to DPB
|
||||
for (i = 0; i < AVC_MAX_DPB_FRAMES; i++) {
|
||||
if (dpb_buffer_.frame_buffer_list[i].use_status == 0) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (i < AVC_MAX_DPB_FRAMES) {
|
||||
AvcPicture *frame_buf = &dpb_buffer_.frame_buffer_list[i];
|
||||
*frame_buf = curr_pic_;
|
||||
if (curr_pic_.pic_structure == kFrame) {
|
||||
frame_buf->use_status = 3;
|
||||
} else if (curr_pic_.pic_structure == kTopField) {
|
||||
frame_buf->use_status = 1;
|
||||
} else {
|
||||
frame_buf->use_status = 2;
|
||||
}
|
||||
if (curr_pic_.is_reference == kUsedForShortTerm) {
|
||||
dpb_buffer_.num_short_term++;
|
||||
} else if (curr_pic_.is_reference == kUsedForLongTerm) {
|
||||
dpb_buffer_.num_long_term++;
|
||||
} else {
|
||||
ERR("Incorrect ref type.");
|
||||
return PARSER_FAIL;
|
||||
}
|
||||
} else {
|
||||
ERR("Could not find any free frame buffer in DPB.");
|
||||
return PARSER_FAIL;
|
||||
}
|
||||
|
||||
return PARSER_OK;
|
||||
}
|
||||
|
||||
#if DBGINFO
|
||||
void AvcVideoParser::PrintSps(AvcSeqParameterSet *p_sps) {
|
||||
uint32_t i, j;
|
||||
|
||||
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