@@ -2483,6 +2483,7 @@ CONFIG_EXTRA="
dnn
dovi_rpu
dvprofile
+ evcparse
exif
faandct
faanidct
@@ -3320,6 +3321,7 @@ av1_amf_encoder_deps="amf"
# parsers
aac_parser_select="adts_header mpeg4audio"
av1_parser_select="cbs_av1"
+evc_parser_select="golomb evcparse"
h264_parser_select="golomb h264dsp h264parse h264_sei"
hevc_parser_select="hevcparse hevc_sei"
mpegaudio_parser_select="mpegaudioheader"
@@ -84,6 +84,7 @@ OBJS-$(CONFIG_DCT) += dct.o dct32_fixed.o dct32_float.o
OBJS-$(CONFIG_DEFLATE_WRAPPER) += zlib_wrapper.o
OBJS-$(CONFIG_DOVI_RPU) += dovi_rpu.o
OBJS-$(CONFIG_ERROR_RESILIENCE) += error_resilience.o
+OBJS-$(CONFIG_EVCPARSE) += evc_parse.o
OBJS-$(CONFIG_EXIF) += exif.o tiff_common.o
OBJS-$(CONFIG_FAANDCT) += faandct.o
OBJS-$(CONFIG_FAANIDCT) += faanidct.o
@@ -1167,6 +1168,7 @@ OBJS-$(CONFIG_DVAUDIO_PARSER) += dvaudio_parser.o
OBJS-$(CONFIG_DVBSUB_PARSER) += dvbsub_parser.o
OBJS-$(CONFIG_DVD_NAV_PARSER) += dvd_nav_parser.o
OBJS-$(CONFIG_DVDSUB_PARSER) += dvdsub_parser.o
+OBJS-$(CONFIG_EVC_PARSER) += evc_parser.o
OBJS-$(CONFIG_FLAC_PARSER) += flac_parser.o flacdata.o flac.o
OBJS-$(CONFIG_FTR_PARSER) += ftr_parser.o
OBJS-$(CONFIG_G723_1_PARSER) += g723_1_parser.o
@@ -65,16 +65,17 @@ extern const FFBitStreamFilter ff_vp9_metadata_bsf;
extern const FFBitStreamFilter ff_vp9_raw_reorder_bsf;
extern const FFBitStreamFilter ff_vp9_superframe_bsf;
extern const FFBitStreamFilter ff_vp9_superframe_split_bsf;
+extern const FFBitStreamFilter ff_evc_frame_merge_bsf;
#include "libavcodec/bsf_list.c"
const AVBitStreamFilter *av_bsf_iterate(void **opaque)
{
- uintptr_t i = (uintptr_t)*opaque;
+ uintptr_t i = (uintptr_t) * opaque;
const FFBitStreamFilter *f = bitstream_filters[i];
if (f) {
- *opaque = (void*)(i + 1);
+ *opaque = (void *)(i + 1);
return &f->p;
}
return NULL;
new file mode 100644
@@ -0,0 +1,155 @@
+/*
+ * EVC definitions and enums
+ * Copyright (c) 2022 Dawid Kozinski <d.kozinski@samsung.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_EVC_H
+#define AVCODEC_EVC_H
+
+// The length field that indicates the length in bytes of the following NAL unit is configured to be of 4 bytes
+#define EVC_NALU_LENGTH_PREFIX_SIZE (4) /* byte */
+#define EVC_NALU_HEADER_SIZE (2) /* byte */
+
+/**
+ * @see ISO_IEC_23094-1_2020, 7.4.2.2 NAL unit header semantic
+ * Table 4 - NAL unit type codes and NAL unit type classes
+ */
+enum EVCNALUnitType {
+ EVC_NOIDR_NUT = 0, /* Coded slice of a non-IDR picture */
+ EVC_IDR_NUT = 1, /* Coded slice of an IDR picture */
+ EVC_RSV_VCL_NUT02 = 2,
+ EVC_RSV_VCL_NUT03 = 3,
+ EVC_RSV_VCL_NUT04 = 4,
+ EVC_RSV_VCL_NUT05 = 5,
+ EVC_RSV_VCL_NUT06 = 6,
+ EVC_RSV_VCL_NUT07 = 7,
+ EVC_RSV_VCL_NUT08 = 8,
+ EVC_RSV_VCL_NUT09 = 9,
+ EVC_RSV_VCL_NUT10 = 10,
+ EVC_RSV_VCL_NUT11 = 11,
+ EVC_RSV_VCL_NUT12 = 12,
+ EVC_RSV_VCL_NUT13 = 13,
+ EVC_RSV_VCL_NUT14 = 14,
+ EVC_RSV_VCL_NUT15 = 15,
+ EVC_RSV_VCL_NUT16 = 16,
+ EVC_RSV_VCL_NUT17 = 17,
+ EVC_RSV_VCL_NUT18 = 18,
+ EVC_RSV_VCL_NUT19 = 19,
+ EVC_RSV_VCL_NUT20 = 20,
+ EVC_RSV_VCL_NUT21 = 21,
+ EVC_RSV_VCL_NUT22 = 22,
+ EVC_RSV_VCL_NUT23 = 23,
+ EVC_SPS_NUT = 24, /* Sequence parameter set */
+ EVC_PPS_NUT = 25, /* Picture paremeter set */
+ EVC_APS_NUT = 26, /* Adaptation parameter set */
+ EVC_FD_NUT = 27, /* Filler data */
+ EVC_SEI_NUT = 28, /* Supplemental enhancement information */
+ EVC_RSV_NONVCL29 = 29,
+ EVC_RSV_NONVCL30 = 30,
+ EVC_RSV_NONVCL31 = 31,
+ EVC_RSV_NONVCL32 = 32,
+ EVC_RSV_NONVCL33 = 33,
+ EVC_RSV_NONVCL34 = 34,
+ EVC_RSV_NONVCL35 = 35,
+ EVC_RSV_NONVCL36 = 36,
+ EVC_RSV_NONVCL37 = 37,
+ EVC_RSV_NONVCL38 = 38,
+ EVC_RSV_NONVCL39 = 39,
+ EVC_RSV_NONVCL40 = 40,
+ EVC_RSV_NONVCL41 = 41,
+ EVC_RSV_NONVCL42 = 42,
+ EVC_RSV_NONVCL43 = 43,
+ EVC_RSV_NONVCL44 = 44,
+ EVC_RSV_NONVCL45 = 45,
+ EVC_RSV_NONVCL46 = 46,
+ EVC_RSV_NONVCL47 = 47,
+ EVC_RSV_NONVCL48 = 48,
+ EVC_RSV_NONVCL49 = 49,
+ EVC_RSV_NONVCL50 = 50,
+ EVC_RSV_NONVCL51 = 51,
+ EVC_RSV_NONVCL52 = 52,
+ EVC_RSV_NONVCL53 = 53,
+ EVC_RSV_NONVCL54 = 54,
+ EVC_RSV_NONVCL55 = 55,
+ EVC_UNSPEC_NUT56 = 56,
+ EVC_UNSPEC_NUT57 = 57,
+ EVC_UNSPEC_NUT58 = 58,
+ EVC_UNSPEC_NUT59 = 59,
+ EVC_UNSPEC_NUT60 = 60,
+ EVC_UNSPEC_NUT61 = 61,
+ EVC_UNSPEC_NUT62 = 62
+};
+
+// slice type
+// @see ISO_IEC_23094-1_2020 7.4.5 Slice header semantics
+//
+enum EVCSliceType {
+ EVC_SLICE_TYPE_B = 0,
+ EVC_SLICE_TYPE_P = 1,
+ EVC_SLICE_TYPE_I = 2
+};
+
+enum {
+ // 7.4.3.2: aps_video_parameter_set_id is u(4).
+ EVC_MAX_APS_COUNT = 32,
+
+ // 7.4.3.1: sps_seq_parameter_set_id is in [0, 15].
+ EVC_MAX_SPS_COUNT = 16,
+
+ // 7.4.3.2: pps_pic_parameter_set_id is in [0, 63].
+ EVC_MAX_PPS_COUNT = 64,
+
+ // 7.4.5: slice header slice_pic_parameter_set_id in [0, 63]
+ EVC_MAX_SH_COUNT = 64,
+
+ // E.3.2: cpb_cnt_minus1[i] is in [0, 31].
+ EVC_MAX_CPB_CNT = 32,
+
+ // A.4.1: in table A.1 the highest level allows a MaxLumaPs of 35 651 584.
+ EVC_MAX_LUMA_PS = 35651584,
+
+ EVC_MAX_NUM_REF_PICS = 21,
+
+ EVC_MAX_NUM_RPLS = 32,
+
+ // A.4.1: pic_width_in_luma_samples and pic_height_in_luma_samples are
+ // constrained to be not greater than sqrt(MaxLumaPs * 8). Hence height/
+ // width are bounded above by sqrt(8 * 35651584) = 16888.2 samples.
+ EVC_MAX_WIDTH = 16888,
+ EVC_MAX_HEIGHT = 16888,
+
+ // A.4.1: table A.1 allows at most 22 tile rows for any level.
+ EVC_MAX_TILE_ROWS = 22,
+ // A.4.1: table A.1 allows at most 20 tile columns for any level.
+ EVC_MAX_TILE_COLUMNS = 20,
+
+ // A.4.1: table A.1 allows at most 600 slice segments for any level.
+ EVC_MAX_SLICE_SEGMENTS = 600,
+
+ // 7.4.7.1: in the worst case (tiles_enabled_flag and
+ // entropy_coding_sync_enabled_flag are both set), entry points can be
+ // placed at the beginning of every Ctb row in every tile, giving an
+ // upper bound of (num_tile_columns_minus1 + 1) * PicHeightInCtbsY - 1.
+ // Only a stream with very high resolution and perverse parameters could
+ // get near that, though, so set a lower limit here with the maximum
+ // possible value for 4K video (at most 135 16x16 Ctb rows).
+ HEVC_MAX_ENTRY_POINT_OFFSETS = EVC_MAX_TILE_COLUMNS * 135,
+};
+
+#endif // AVCODEC_EVC_H
new file mode 100644
@@ -0,0 +1,833 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "golomb.h"
+#include "parser.h"
+#include "evc.h"
+#include "evc_parse.h"
+
+#define EXTENDED_SAR 255
+
+#define NUM_CHROMA_FORMATS 4 // @see ISO_IEC_23094-1 section 6.2 table 2
+
+static const enum AVPixelFormat pix_fmts_8bit[NUM_CHROMA_FORMATS] = {
+ AV_PIX_FMT_GRAY8, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P
+};
+
+static const enum AVPixelFormat pix_fmts_9bit[NUM_CHROMA_FORMATS] = {
+ AV_PIX_FMT_GRAY9, AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9
+};
+
+static const enum AVPixelFormat pix_fmts_10bit[NUM_CHROMA_FORMATS] = {
+ AV_PIX_FMT_GRAY10, AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10
+};
+
+static const enum AVPixelFormat pix_fmts_12bit[NUM_CHROMA_FORMATS] = {
+ AV_PIX_FMT_GRAY12, AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12
+};
+
+static const enum AVPixelFormat pix_fmts_14bit[NUM_CHROMA_FORMATS] = {
+ AV_PIX_FMT_GRAY14, AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14
+};
+
+static const enum AVPixelFormat pix_fmts_16bit[NUM_CHROMA_FORMATS] = {
+ AV_PIX_FMT_GRAY16, AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16
+};
+
+int ff_evc_get_nalu_type(const uint8_t *bits, int bits_size, void *logctx)
+{
+ int unit_type_plus1 = 0;
+
+ if (bits_size >= EVC_NALU_HEADER_SIZE) {
+ unsigned char *p = (unsigned char *)bits;
+ // forbidden_zero_bit
+ if ((p[0] & 0x80) != 0) {
+ av_log(logctx, AV_LOG_ERROR, "Invalid NAL unit header\n");
+ return -1;
+ }
+
+ // nal_unit_type
+ unit_type_plus1 = (p[0] >> 1) & 0x3F;
+ }
+
+ return unit_type_plus1 - 1;
+}
+
+uint32_t ff_evc_read_nal_unit_length(const uint8_t *bits, int bits_size, void *logctx)
+{
+ uint32_t nalu_len = 0;
+
+ if (bits_size < EVC_NALU_LENGTH_PREFIX_SIZE) {
+ av_log(logctx, AV_LOG_ERROR, "Can't read NAL unit length\n");
+ return 0;
+ }
+
+ nalu_len = AV_RB32(bits);
+
+ return nalu_len;
+}
+
+// nuh_temporal_id specifies a temporal identifier for the NAL unit
+int ff_evc_get_temporal_id(const uint8_t *bits, int bits_size, void *logctx)
+{
+ int temporal_id = 0;
+ uint16_t t = 0;
+
+ if (bits_size < EVC_NALU_HEADER_SIZE) {
+ av_log(logctx, AV_LOG_ERROR, "Can't read NAL unit header\n");
+ return 0;
+ }
+
+ // forbidden_zero_bit
+ if ((bits[0] & 0x80) != 0)
+ return -1;
+
+ t = AV_RB16(bits);
+
+ temporal_id = (t >> 6) & 0x0007;
+
+ return temporal_id;
+}
+
+// @see ISO_IEC_23094-1 (7.3.7 Reference picture list structure syntax)
+static int ref_pic_list_struct(GetBitContext *gb, RefPicListStruct *rpl)
+{
+ uint32_t delta_poc_st, strp_entry_sign_flag = 0;
+ rpl->ref_pic_num = get_ue_golomb(gb);
+ if (rpl->ref_pic_num > 0) {
+ delta_poc_st = get_ue_golomb(gb);
+
+ rpl->ref_pics[0] = delta_poc_st;
+ if (rpl->ref_pics[0] != 0) {
+ strp_entry_sign_flag = get_bits(gb, 1);
+
+ rpl->ref_pics[0] *= 1 - (strp_entry_sign_flag << 1);
+ }
+ }
+
+ for (int i = 1; i < rpl->ref_pic_num; ++i) {
+ delta_poc_st = get_ue_golomb(gb);
+ if (delta_poc_st != 0)
+ strp_entry_sign_flag = get_bits(gb, 1);
+ rpl->ref_pics[i] = rpl->ref_pics[i - 1] + delta_poc_st * (1 - (strp_entry_sign_flag << 1));
+ }
+
+ return 0;
+}
+
+// @see ISO_IEC_23094-1 (E.2.2 HRD parameters syntax)
+static int hrd_parameters(GetBitContext *gb, HRDParameters *hrd)
+{
+ hrd->cpb_cnt_minus1 = get_ue_golomb(gb);
+ hrd->bit_rate_scale = get_bits(gb, 4);
+ hrd->cpb_size_scale = get_bits(gb, 4);
+ for (int SchedSelIdx = 0; SchedSelIdx <= hrd->cpb_cnt_minus1; SchedSelIdx++) {
+ hrd->bit_rate_value_minus1[SchedSelIdx] = get_ue_golomb(gb);
+ hrd->cpb_size_value_minus1[SchedSelIdx] = get_ue_golomb(gb);
+ hrd->cbr_flag[SchedSelIdx] = get_bits(gb, 1);
+ }
+ hrd->initial_cpb_removal_delay_length_minus1 = get_bits(gb, 5);
+ hrd->cpb_removal_delay_length_minus1 = get_bits(gb, 5);
+ hrd->cpb_removal_delay_length_minus1 = get_bits(gb, 5);
+ hrd->time_offset_length = get_bits(gb, 5);
+
+ return 0;
+}
+
+// @see ISO_IEC_23094-1 (E.2.1 VUI parameters syntax)
+static int vui_parameters(GetBitContext *gb, VUIParameters *vui)
+{
+ vui->aspect_ratio_info_present_flag = get_bits(gb, 1);
+ if (vui->aspect_ratio_info_present_flag) {
+ vui->aspect_ratio_idc = get_bits(gb, 8);
+ if (vui->aspect_ratio_idc == EXTENDED_SAR) {
+ vui->sar_width = get_bits(gb, 16);
+ vui->sar_height = get_bits(gb, 16);
+ }
+ }
+ vui->overscan_info_present_flag = get_bits(gb, 1);
+ if (vui->overscan_info_present_flag)
+ vui->overscan_appropriate_flag = get_bits(gb, 1);
+ vui->video_signal_type_present_flag = get_bits(gb, 1);
+ if (vui->video_signal_type_present_flag) {
+ vui->video_format = get_bits(gb, 3);
+ vui->video_full_range_flag = get_bits(gb, 1);
+ vui->colour_description_present_flag = get_bits(gb, 1);
+ if (vui->colour_description_present_flag) {
+ vui->colour_primaries = get_bits(gb, 8);
+ vui->transfer_characteristics = get_bits(gb, 8);
+ vui->matrix_coefficients = get_bits(gb, 8);
+ }
+ }
+ vui->chroma_loc_info_present_flag = get_bits(gb, 1);
+ if (vui->chroma_loc_info_present_flag) {
+ vui->chroma_sample_loc_type_top_field = get_ue_golomb(gb);
+ vui->chroma_sample_loc_type_bottom_field = get_ue_golomb(gb);
+ }
+ vui->neutral_chroma_indication_flag = get_bits(gb, 1);
+
+ vui->field_seq_flag = get_bits(gb, 1);
+
+ vui->timing_info_present_flag = get_bits(gb, 1);
+ if (vui->timing_info_present_flag) {
+ vui->num_units_in_tick = get_bits(gb, 32);
+ vui->time_scale = get_bits(gb, 32);
+ vui->fixed_pic_rate_flag = get_bits(gb, 1);
+ }
+ vui->nal_hrd_parameters_present_flag = get_bits(gb, 1);
+ if (vui->nal_hrd_parameters_present_flag)
+ hrd_parameters(gb, &vui->hrd_parameters);
+ vui->vcl_hrd_parameters_present_flag = get_bits(gb, 1);
+ if (vui->vcl_hrd_parameters_present_flag)
+ hrd_parameters(gb, &vui->hrd_parameters);
+ if (vui->nal_hrd_parameters_present_flag || vui->vcl_hrd_parameters_present_flag)
+ vui->low_delay_hrd_flag = get_bits(gb, 1);
+ vui->pic_struct_present_flag = get_bits(gb, 1);
+ vui->bitstream_restriction_flag = get_bits(gb, 1);
+ if (vui->bitstream_restriction_flag) {
+ vui->motion_vectors_over_pic_boundaries_flag = get_bits(gb, 1);
+ vui->max_bytes_per_pic_denom = get_ue_golomb(gb);
+ vui->max_bits_per_mb_denom = get_ue_golomb(gb);
+ vui->log2_max_mv_length_horizontal = get_ue_golomb(gb);
+ vui->log2_max_mv_length_vertical = get_ue_golomb(gb);
+ vui->num_reorder_pics = get_ue_golomb(gb);
+ vui->max_dec_pic_buffering = get_ue_golomb(gb);
+ }
+
+ return 0;
+}
+
+// @see ISO_IEC_23094-1 (7.3.2.1 SPS RBSP syntax)
+EVCParserSPS *ff_evc_parse_sps(EVCParserContext *ctx, const uint8_t *bs, int bs_size)
+{
+ GetBitContext gb;
+ EVCParserSPS *sps;
+ int sps_seq_parameter_set_id;
+
+ if (init_get_bits8(&gb, bs, bs_size) < 0)
+ return NULL;
+
+ sps_seq_parameter_set_id = get_ue_golomb(&gb);
+
+ if (sps_seq_parameter_set_id >= EVC_MAX_SPS_COUNT)
+ return NULL;
+
+ if(!ctx->sps[sps_seq_parameter_set_id]) {
+ if((ctx->sps[sps_seq_parameter_set_id] = av_malloc(sizeof(EVCParserSPS))) == NULL)
+ return NULL;
+ }
+
+ sps = ctx->sps[sps_seq_parameter_set_id];
+ sps->sps_seq_parameter_set_id = sps_seq_parameter_set_id;
+
+ // the Baseline profile is indicated by profile_idc eqal to 0
+ // the Main profile is indicated by profile_idc eqal to 1
+ sps->profile_idc = get_bits(&gb, 8);
+
+ sps->level_idc = get_bits(&gb, 8);
+
+ skip_bits_long(&gb, 32); /* skip toolset_idc_h */
+ skip_bits_long(&gb, 32); /* skip toolset_idc_l */
+
+ // 0 - monochrome
+ // 1 - 4:2:0
+ // 2 - 4:2:2
+ // 3 - 4:4:4
+ sps->chroma_format_idc = get_ue_golomb(&gb);
+
+ sps->pic_width_in_luma_samples = get_ue_golomb(&gb);
+ sps->pic_height_in_luma_samples = get_ue_golomb(&gb);
+
+ sps->bit_depth_luma_minus8 = get_ue_golomb(&gb);
+ sps->bit_depth_chroma_minus8 = get_ue_golomb(&gb);
+
+ sps->sps_btt_flag = get_bits(&gb, 1);
+ if (sps->sps_btt_flag) {
+ sps->log2_ctu_size_minus5 = get_ue_golomb(&gb);
+ sps->log2_min_cb_size_minus2 = get_ue_golomb(&gb);
+ sps->log2_diff_ctu_max_14_cb_size = get_ue_golomb(&gb);
+ sps->log2_diff_ctu_max_tt_cb_size = get_ue_golomb(&gb);
+ sps->log2_diff_min_cb_min_tt_cb_size_minus2 = get_ue_golomb(&gb);
+ }
+
+ sps->sps_suco_flag = get_bits(&gb, 1);
+ if (sps->sps_suco_flag) {
+ sps->log2_diff_ctu_size_max_suco_cb_size = get_ue_golomb(&gb);
+ sps->log2_diff_max_suco_min_suco_cb_size = get_ue_golomb(&gb);
+ }
+
+ sps->sps_admvp_flag = get_bits(&gb, 1);
+ if (sps->sps_admvp_flag) {
+ sps->sps_affine_flag = get_bits(&gb, 1);
+ sps->sps_amvr_flag = get_bits(&gb, 1);
+ sps->sps_dmvr_flag = get_bits(&gb, 1);
+ sps->sps_mmvd_flag = get_bits(&gb, 1);
+ sps->sps_hmvp_flag = get_bits(&gb, 1);
+ }
+
+ sps->sps_eipd_flag = get_bits(&gb, 1);
+ if (sps->sps_eipd_flag) {
+ sps->sps_ibc_flag = get_bits(&gb, 1);
+ if (sps->sps_ibc_flag)
+ sps->log2_max_ibc_cand_size_minus2 = get_ue_golomb(&gb);
+ }
+
+ sps->sps_cm_init_flag = get_bits(&gb, 1);
+ if (sps->sps_cm_init_flag)
+ sps->sps_adcc_flag = get_bits(&gb, 1);
+
+ sps->sps_iqt_flag = get_bits(&gb, 1);
+ if (sps->sps_iqt_flag)
+ sps->sps_ats_flag = get_bits(&gb, 1);
+
+ sps->sps_addb_flag = get_bits(&gb, 1);
+ sps->sps_alf_flag = get_bits(&gb, 1);
+ sps->sps_htdf_flag = get_bits(&gb, 1);
+ sps->sps_rpl_flag = get_bits(&gb, 1);
+ sps->sps_pocs_flag = get_bits(&gb, 1);
+ sps->sps_dquant_flag = get_bits(&gb, 1);
+ sps->sps_dra_flag = get_bits(&gb, 1);
+
+ if (sps->sps_pocs_flag)
+ sps->log2_max_pic_order_cnt_lsb_minus4 = get_ue_golomb(&gb);
+
+ if (!sps->sps_pocs_flag || !sps->sps_rpl_flag) {
+ sps->log2_sub_gop_length = get_ue_golomb(&gb);
+ if (sps->log2_sub_gop_length == 0)
+ sps->log2_ref_pic_gap_length = get_ue_golomb(&gb);
+ }
+
+ if (!sps->sps_rpl_flag)
+ sps->max_num_tid0_ref_pics = get_ue_golomb(&gb);
+ else {
+ sps->sps_max_dec_pic_buffering_minus1 = get_ue_golomb(&gb);
+ sps->long_term_ref_pic_flag = get_bits(&gb, 1);
+ sps->rpl1_same_as_rpl0_flag = get_bits(&gb, 1);
+ sps->num_ref_pic_list_in_sps[0] = get_ue_golomb(&gb);
+
+ for (int i = 0; i < sps->num_ref_pic_list_in_sps[0]; ++i)
+ ref_pic_list_struct(&gb, &sps->rpls[0][i]);
+
+ if (!sps->rpl1_same_as_rpl0_flag) {
+ sps->num_ref_pic_list_in_sps[1] = get_ue_golomb(&gb);
+ for (int i = 0; i < sps->num_ref_pic_list_in_sps[1]; ++i)
+ ref_pic_list_struct(&gb, &sps->rpls[1][i]);
+ }
+ }
+
+ sps->picture_cropping_flag = get_bits(&gb, 1);
+
+ if (sps->picture_cropping_flag) {
+ sps->picture_crop_left_offset = get_ue_golomb(&gb);
+ sps->picture_crop_right_offset = get_ue_golomb(&gb);
+ sps->picture_crop_top_offset = get_ue_golomb(&gb);
+ sps->picture_crop_bottom_offset = get_ue_golomb(&gb);
+ }
+
+ if (sps->chroma_format_idc != 0) {
+ sps->chroma_qp_table_struct.chroma_qp_table_present_flag = get_bits(&gb, 1);
+
+ if (sps->chroma_qp_table_struct.chroma_qp_table_present_flag) {
+ sps->chroma_qp_table_struct.same_qp_table_for_chroma = get_bits(&gb, 1);
+ sps->chroma_qp_table_struct.global_offset_flag = get_bits(&gb, 1);
+ for (int i = 0; i < (sps->chroma_qp_table_struct.same_qp_table_for_chroma ? 1 : 2); i++) {
+ sps->chroma_qp_table_struct.num_points_in_qp_table_minus1[i] = get_ue_golomb(&gb);;
+ for (int j = 0; j <= sps->chroma_qp_table_struct.num_points_in_qp_table_minus1[i]; j++) {
+ sps->chroma_qp_table_struct.delta_qp_in_val_minus1[i][j] = get_bits(&gb, 6);
+ sps->chroma_qp_table_struct.delta_qp_out_val[i][j] = get_se_golomb(&gb);
+ }
+ }
+ }
+ }
+
+ sps->vui_parameters_present_flag = get_bits(&gb, 1);
+ if (sps->vui_parameters_present_flag)
+ vui_parameters(&gb, &(sps->vui_parameters));
+
+ // @note
+ // If necessary, add the missing fields to the EVCParserSPS structure
+ // and then extend parser implementation
+
+ return sps;
+}
+
+// @see ISO_IEC_23094-1 (7.3.2.2 SPS RBSP syntax)
+//
+// @note
+// The current implementation of parse_sps function doesn't handle VUI parameters parsing.
+// If it will be needed, parse_sps function could be extended to handle VUI parameters parsing
+// to initialize fields of the AVCodecContex i.e. color_primaries, color_trc,color_range
+//
+EVCParserPPS *ff_evc_parse_pps(EVCParserContext *ctx, const uint8_t *bs, int bs_size)
+{
+ GetBitContext gb;
+ EVCParserPPS *pps;
+
+ int pps_pic_parameter_set_id;
+
+ if (init_get_bits8(&gb, bs, bs_size) < 0)
+ return NULL;
+
+ pps_pic_parameter_set_id = get_ue_golomb(&gb);
+ if (pps_pic_parameter_set_id > EVC_MAX_PPS_COUNT)
+ return NULL;
+
+ if(!ctx->pps[pps_pic_parameter_set_id]) {
+ if((ctx->pps[pps_pic_parameter_set_id] = av_malloc(sizeof(EVCParserSPS))) == NULL)
+ return NULL;
+ }
+
+ pps = ctx->pps[pps_pic_parameter_set_id];
+
+ pps->pps_pic_parameter_set_id = pps_pic_parameter_set_id;
+
+ pps->pps_seq_parameter_set_id = get_ue_golomb(&gb);
+ if (pps->pps_seq_parameter_set_id >= EVC_MAX_SPS_COUNT)
+ return NULL;
+
+ pps->num_ref_idx_default_active_minus1[0] = get_ue_golomb(&gb);
+ pps->num_ref_idx_default_active_minus1[1] = get_ue_golomb(&gb);
+ pps->additional_lt_poc_lsb_len = get_ue_golomb(&gb);
+ pps->rpl1_idx_present_flag = get_bits(&gb, 1);
+ pps->single_tile_in_pic_flag = get_bits(&gb, 1);
+
+ if (!pps->single_tile_in_pic_flag) {
+ pps->num_tile_columns_minus1 = get_ue_golomb(&gb);
+ pps->num_tile_rows_minus1 = get_ue_golomb(&gb);
+ pps->uniform_tile_spacing_flag = get_bits(&gb, 1);
+
+ if (!pps->uniform_tile_spacing_flag) {
+ for (int i = 0; i < pps->num_tile_columns_minus1; i++)
+ pps->tile_column_width_minus1[i] = get_ue_golomb(&gb);
+
+ for (int i = 0; i < pps->num_tile_rows_minus1; i++)
+ pps->tile_row_height_minus1[i] = get_ue_golomb(&gb);
+ }
+ pps->loop_filter_across_tiles_enabled_flag = get_bits(&gb, 1);
+ pps->tile_offset_len_minus1 = get_ue_golomb(&gb);
+ }
+
+ pps->tile_id_len_minus1 = get_ue_golomb(&gb);
+ pps->explicit_tile_id_flag = get_bits(&gb, 1);
+
+ if (pps->explicit_tile_id_flag) {
+ for (int i = 0; i <= pps->num_tile_rows_minus1; i++) {
+ for (int j = 0; j <= pps->num_tile_columns_minus1; j++)
+ pps->tile_id_val[i][j] = get_bits(&gb, pps->tile_id_len_minus1 + 1);
+ }
+ }
+
+ pps->pic_dra_enabled_flag = 0;
+ pps->pic_dra_enabled_flag = get_bits(&gb, 1);
+
+ if (pps->pic_dra_enabled_flag)
+ pps->pic_dra_aps_id = get_bits(&gb, 5);
+
+ pps->arbitrary_slice_present_flag = get_bits(&gb, 1);
+ pps->constrained_intra_pred_flag = get_bits(&gb, 1);
+ pps->cu_qp_delta_enabled_flag = get_bits(&gb, 1);
+
+ if (pps->cu_qp_delta_enabled_flag)
+ pps->log2_cu_qp_delta_area_minus6 = get_ue_golomb(&gb);
+
+ return pps;
+}
+
+// @see ISO_IEC_23094-1 (7.3.2.6 Slice layer RBSP syntax)
+EVCParserSliceHeader *ff_evc_parse_slice_header(EVCParserContext *ctx, const uint8_t *bs, int bs_size)
+{
+ GetBitContext gb;
+ EVCParserSliceHeader *sh;
+ EVCParserPPS *pps;
+ EVCParserSPS *sps;
+
+ int num_tiles_in_slice = 0;
+ int slice_pic_parameter_set_id;
+
+ if (init_get_bits8(&gb, bs, bs_size) < 0)
+ return NULL;
+
+ slice_pic_parameter_set_id = get_ue_golomb(&gb);
+
+ if (slice_pic_parameter_set_id < 0 || slice_pic_parameter_set_id >= EVC_MAX_PPS_COUNT)
+ return NULL;
+
+ if(!ctx->slice_header[slice_pic_parameter_set_id]) {
+ if((ctx->slice_header[slice_pic_parameter_set_id] = av_malloc(sizeof(EVCParserSliceHeader))) == NULL)
+ return NULL;
+ }
+
+ sh = ctx->slice_header[slice_pic_parameter_set_id];
+
+ pps = ctx->pps[slice_pic_parameter_set_id];
+ if(!pps)
+ return NULL;
+
+ sps = ctx->sps[slice_pic_parameter_set_id];
+ if(!sps)
+ return NULL;
+
+ sh->slice_pic_parameter_set_id = slice_pic_parameter_set_id;
+
+ if (!pps->single_tile_in_pic_flag) {
+ sh->single_tile_in_slice_flag = get_bits(&gb, 1);
+ sh->first_tile_id = get_bits(&gb, pps->tile_id_len_minus1 + 1);
+ } else
+ sh->single_tile_in_slice_flag = 1;
+
+ if (!sh->single_tile_in_slice_flag) {
+ if (pps->arbitrary_slice_present_flag)
+ sh->arbitrary_slice_flag = get_bits(&gb, 1);
+
+ if (!sh->arbitrary_slice_flag)
+ sh->last_tile_id = get_bits(&gb, pps->tile_id_len_minus1 + 1);
+ else {
+ sh->num_remaining_tiles_in_slice_minus1 = get_ue_golomb(&gb);
+ num_tiles_in_slice = sh->num_remaining_tiles_in_slice_minus1 + 2;
+ for (int i = 0; i < num_tiles_in_slice - 1; ++i)
+ sh->delta_tile_id_minus1[i] = get_ue_golomb(&gb);
+ }
+ }
+
+ sh->slice_type = get_ue_golomb(&gb);
+
+ if (ctx->nalu_type == EVC_IDR_NUT)
+ sh->no_output_of_prior_pics_flag = get_bits(&gb, 1);
+
+ if (sps->sps_mmvd_flag && ((sh->slice_type == EVC_SLICE_TYPE_B) || (sh->slice_type == EVC_SLICE_TYPE_P)))
+ sh->mmvd_group_enable_flag = get_bits(&gb, 1);
+ else
+ sh->mmvd_group_enable_flag = 0;
+
+ if (sps->sps_alf_flag) {
+ int ChromaArrayType = sps->chroma_format_idc;
+
+ sh->slice_alf_enabled_flag = get_bits(&gb, 1);
+
+ if (sh->slice_alf_enabled_flag) {
+ sh->slice_alf_luma_aps_id = get_bits(&gb, 5);
+ sh->slice_alf_map_flag = get_bits(&gb, 1);
+ sh->slice_alf_chroma_idc = get_bits(&gb, 2);
+
+ if ((ChromaArrayType == 1 || ChromaArrayType == 2) && sh->slice_alf_chroma_idc > 0)
+ sh->slice_alf_chroma_aps_id = get_bits(&gb, 5);
+ }
+ if (ChromaArrayType == 3) {
+ int sliceChromaAlfEnabledFlag = 0;
+ int sliceChroma2AlfEnabledFlag = 0;
+
+ if (sh->slice_alf_chroma_idc == 1) { // @see ISO_IEC_23094-1 (7.4.5)
+ sliceChromaAlfEnabledFlag = 1;
+ sliceChroma2AlfEnabledFlag = 0;
+ } else if (sh->slice_alf_chroma_idc == 2) {
+ sliceChromaAlfEnabledFlag = 0;
+ sliceChroma2AlfEnabledFlag = 1;
+ } else if (sh->slice_alf_chroma_idc == 3) {
+ sliceChromaAlfEnabledFlag = 1;
+ sliceChroma2AlfEnabledFlag = 1;
+ } else {
+ sliceChromaAlfEnabledFlag = 0;
+ sliceChroma2AlfEnabledFlag = 0;
+ }
+
+ if (!sh->slice_alf_enabled_flag)
+ sh->slice_alf_chroma_idc = get_bits(&gb, 2);
+
+ if (sliceChromaAlfEnabledFlag) {
+ sh->slice_alf_chroma_aps_id = get_bits(&gb, 5);
+ sh->slice_alf_chroma_map_flag = get_bits(&gb, 1);
+ }
+
+ if (sliceChroma2AlfEnabledFlag) {
+ sh->slice_alf_chroma2_aps_id = get_bits(&gb, 5);
+ sh->slice_alf_chroma2_map_flag = get_bits(&gb, 1);
+ }
+ }
+ }
+
+ if (ctx->nalu_type != EVC_IDR_NUT) {
+ if (sps->sps_pocs_flag)
+ sh->slice_pic_order_cnt_lsb = get_bits(&gb, sps->log2_max_pic_order_cnt_lsb_minus4 + 4);
+ }
+
+ // @note
+ // If necessary, add the missing fields to the EVCParserSliceHeader structure
+ // and then extend parser implementation
+
+ return sh;
+}
+
+int ff_evc_parse_nal_unit(EVCParserContext *ctx, const uint8_t *buf, int buf_size, void *logctx)
+{
+ int nalu_type, nalu_size;
+ int tid;
+ const uint8_t *data = buf;
+ int data_size = buf_size;
+
+ // ctx->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
+ ctx->key_frame = -1;
+
+ nalu_size = buf_size;
+ if (nalu_size <= 0) {
+ av_log(logctx, AV_LOG_ERROR, "Invalid NAL unit size: (%d)\n", nalu_size);
+ return AVERROR_INVALIDDATA;
+ }
+
+ // @see ISO_IEC_23094-1_2020, 7.4.2.2 NAL unit header semantic (Table 4 - NAL unit type codes and NAL unit type classes)
+ // @see enum EVCNALUnitType in evc.h
+ nalu_type = ff_evc_get_nalu_type(data, data_size, logctx);
+ if (nalu_type < EVC_NOIDR_NUT || nalu_type > EVC_UNSPEC_NUT62) {
+ av_log(logctx, AV_LOG_ERROR, "Invalid NAL unit type: (%d)\n", nalu_type);
+ return AVERROR_INVALIDDATA;
+ }
+ ctx->nalu_type = nalu_type;
+
+ tid = ff_evc_get_temporal_id(data, data_size, logctx);
+ if (tid < 0) {
+ av_log(logctx, AV_LOG_ERROR, "Invalid temporial id: (%d)\n", tid);
+ return AVERROR_INVALIDDATA;
+ }
+ ctx->nuh_temporal_id = tid;
+
+ data += EVC_NALU_HEADER_SIZE;
+ data_size -= EVC_NALU_HEADER_SIZE;
+
+ switch(nalu_type) {
+ case EVC_SPS_NUT: {
+ EVCParserSPS *sps;
+ int SubGopLength;
+ int bit_depth;
+
+ sps = ff_evc_parse_sps(ctx, data, nalu_size);
+ if (!sps) {
+ av_log(logctx, AV_LOG_ERROR, "SPS parsing error\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ ctx->coded_width = sps->pic_width_in_luma_samples;
+ ctx->coded_height = sps->pic_height_in_luma_samples;
+
+ if(sps->picture_cropping_flag) {
+ ctx->width = sps->pic_width_in_luma_samples - sps->picture_crop_left_offset - sps->picture_crop_right_offset;
+ ctx->height = sps->pic_height_in_luma_samples - sps->picture_crop_top_offset - sps->picture_crop_bottom_offset;
+ } else {
+ ctx->width = sps->pic_width_in_luma_samples;
+ ctx->height = sps->pic_height_in_luma_samples;
+ }
+
+ SubGopLength = (int)pow(2.0, sps->log2_sub_gop_length);
+ ctx->gop_size = SubGopLength;
+
+ ctx->delay = (sps->sps_max_dec_pic_buffering_minus1) ? sps->sps_max_dec_pic_buffering_minus1 - 1 : SubGopLength + sps->max_num_tid0_ref_pics - 1;
+
+ if (sps->profile_idc == 1) ctx->profile = FF_PROFILE_EVC_MAIN;
+ else ctx->profile = FF_PROFILE_EVC_BASELINE;
+
+ if (sps->vui_parameters_present_flag) {
+ if (sps->vui_parameters.timing_info_present_flag) {
+ int64_t num = sps->vui_parameters.num_units_in_tick;
+ int64_t den = sps->vui_parameters.time_scale;
+ if (num != 0 && den != 0)
+ av_reduce(&ctx->framerate.den, &ctx->framerate.num, num, den, 1 << 30);
+ }
+ }
+
+ bit_depth = sps->bit_depth_chroma_minus8 + 8;
+ ctx->format = AV_PIX_FMT_NONE;
+
+ switch (bit_depth) {
+ case 8:
+ ctx->format = pix_fmts_8bit[sps->chroma_format_idc];
+ break;
+ case 9:
+ ctx->format = pix_fmts_9bit[sps->chroma_format_idc];
+ break;
+ case 10:
+ ctx->format = pix_fmts_10bit[sps->chroma_format_idc];
+ break;
+ case 12:
+ ctx->format = pix_fmts_12bit[sps->chroma_format_idc];
+ break;
+ case 14:
+ ctx->format = pix_fmts_14bit[sps->chroma_format_idc];
+ break;
+ case 16:
+ ctx->format = pix_fmts_16bit[sps->chroma_format_idc];
+ break;
+ }
+ av_assert0(ctx->format != AV_PIX_FMT_NONE);
+
+ break;
+ }
+ case EVC_PPS_NUT: {
+ EVCParserPPS *pps;
+
+ pps = ff_evc_parse_pps(ctx, data, nalu_size);
+ if (!pps) {
+ av_log(logctx, AV_LOG_ERROR, "PPS parsing error\n");
+ return AVERROR_INVALIDDATA;
+ }
+ break;
+ }
+ case EVC_SEI_NUT: // Supplemental Enhancement Information
+ case EVC_APS_NUT: // Adaptation parameter set
+ case EVC_FD_NUT: // Filler data
+ break;
+ case EVC_IDR_NUT: // Coded slice of a IDR or non-IDR picture
+ case EVC_NOIDR_NUT: {
+ EVCParserSliceHeader *sh;
+ EVCParserSPS *sps;
+ int slice_pic_parameter_set_id;
+
+ sh = ff_evc_parse_slice_header(ctx, data, nalu_size);
+ if (!sh) {
+ av_log(logctx, AV_LOG_ERROR, "Slice header parsing error\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ switch (sh->slice_type) {
+ case EVC_SLICE_TYPE_B: {
+ ctx->pict_type = AV_PICTURE_TYPE_B;
+ break;
+ }
+ case EVC_SLICE_TYPE_P: {
+ ctx->pict_type = AV_PICTURE_TYPE_P;
+ break;
+ }
+ case EVC_SLICE_TYPE_I: {
+ ctx->pict_type = AV_PICTURE_TYPE_I;
+ break;
+ }
+ default: {
+ ctx->pict_type = AV_PICTURE_TYPE_NONE;
+ }
+ }
+
+ ctx->key_frame = (nalu_type == EVC_IDR_NUT) ? 1 : 0;
+
+ // POC (picture order count of the current picture) derivation
+ // @see ISO/IEC 23094-1:2020(E) 8.3.1 Decoding process for picture order count
+ slice_pic_parameter_set_id = sh->slice_pic_parameter_set_id;
+ sps = ctx->sps[slice_pic_parameter_set_id];
+
+ if (sps && sps->sps_pocs_flag) {
+
+ int PicOrderCntMsb = 0;
+ ctx->poc.prevPicOrderCntVal = ctx->poc.PicOrderCntVal;
+
+ if (nalu_type == EVC_IDR_NUT)
+ PicOrderCntMsb = 0;
+ else {
+ int MaxPicOrderCntLsb = 1 << (sps->log2_max_pic_order_cnt_lsb_minus4 + 4);
+
+ int prevPicOrderCntLsb = ctx->poc.PicOrderCntVal & (MaxPicOrderCntLsb - 1);
+ int prevPicOrderCntMsb = ctx->poc.PicOrderCntVal - prevPicOrderCntLsb;
+
+
+ if ((sh->slice_pic_order_cnt_lsb < prevPicOrderCntLsb) &&
+ ((prevPicOrderCntLsb - sh->slice_pic_order_cnt_lsb) >= (MaxPicOrderCntLsb / 2)))
+
+ PicOrderCntMsb = prevPicOrderCntMsb + MaxPicOrderCntLsb;
+
+ else if ((sh->slice_pic_order_cnt_lsb > prevPicOrderCntLsb) &&
+ ((sh->slice_pic_order_cnt_lsb - prevPicOrderCntLsb) > (MaxPicOrderCntLsb / 2)))
+
+ PicOrderCntMsb = prevPicOrderCntMsb - MaxPicOrderCntLsb;
+
+ else
+ PicOrderCntMsb = prevPicOrderCntMsb;
+ }
+ ctx->poc.PicOrderCntVal = PicOrderCntMsb + sh->slice_pic_order_cnt_lsb;
+
+ } else {
+ if (nalu_type == EVC_IDR_NUT) {
+ ctx->poc.PicOrderCntVal = 0;
+ ctx->poc.DocOffset = -1;
+ } else {
+ int SubGopLength = (int)pow(2.0, sps->log2_sub_gop_length);
+ if (tid == 0) {
+ ctx->poc.PicOrderCntVal = ctx->poc.prevPicOrderCntVal + SubGopLength;
+ ctx->poc.DocOffset = 0;
+ ctx->poc.prevPicOrderCntVal = ctx->poc.PicOrderCntVal;
+ } else {
+ int ExpectedTemporalId;
+ int PocOffset;
+ int prevDocOffset = ctx->poc.DocOffset;
+
+ ctx->poc.DocOffset = (prevDocOffset + 1) % SubGopLength;
+ if (ctx->poc.DocOffset == 0) {
+ ctx->poc.prevPicOrderCntVal += SubGopLength;
+ ExpectedTemporalId = 0;
+ } else
+ ExpectedTemporalId = 1 + (int)log2(ctx->poc.DocOffset);
+ while (tid != ExpectedTemporalId) {
+ ctx->poc.DocOffset = (ctx->poc.DocOffset + 1) % SubGopLength;
+ if (ctx->poc.DocOffset == 0)
+ ExpectedTemporalId = 0;
+ else
+ ExpectedTemporalId = 1 + (int)log2(ctx->poc.DocOffset);
+ }
+ PocOffset = (int)(SubGopLength * ((2.0 * ctx->poc.DocOffset + 1) / (int)pow(2.0, tid) - 2));
+ ctx->poc.PicOrderCntVal = ctx->poc.prevPicOrderCntVal + PocOffset;
+ }
+ }
+ }
+
+ ctx->output_picture_number = ctx->poc.PicOrderCntVal;
+ ctx->key_frame = (nalu_type == EVC_IDR_NUT) ? 1 : 0;
+
+ break;
+ }
+ }
+
+ return 0;
+}
+
+int ff_evc_parse_nal_units(EVCParserContext *ctx, const uint8_t *buf, int buf_size, void *logctx)
+{
+ const uint8_t *data = buf;
+ int data_size = buf_size;
+ int bytes_read = 0;
+ int nalu_size = 0;
+
+ while (data_size > 0) {
+
+ // Buffer size is not enough for buffer to store NAL unit 4-bytes prefix (length)
+ if (data_size < EVC_NALU_LENGTH_PREFIX_SIZE)
+ return END_NOT_FOUND;
+
+ nalu_size = ff_evc_read_nal_unit_length(data, data_size, logctx);
+
+ bytes_read += EVC_NALU_LENGTH_PREFIX_SIZE;
+
+ data += EVC_NALU_LENGTH_PREFIX_SIZE;
+ data_size -= EVC_NALU_LENGTH_PREFIX_SIZE;
+
+ if (data_size < nalu_size)
+ return END_NOT_FOUND;
+
+ if (ff_evc_parse_nal_unit(ctx, data, nalu_size, logctx) != 0) {
+ av_log(logctx, AV_LOG_ERROR, "Parsing of NAL unit failed\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ data += nalu_size;
+ data_size -= nalu_size;
+ }
+ return 0;
+}
new file mode 100644
@@ -0,0 +1,330 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * EVC decoder/parser shared code
+ */
+
+#ifndef AVCODEC_EVC_PARSE_H
+#define AVCODEC_EVC_PARSE_H
+
+#define EVC_MAX_QP_TABLE_SIZE 58
+#define NUM_CPB 32
+
+// rpl structure
+typedef struct RefPicListStruct {
+ int poc;
+ int tid;
+ int ref_pic_num;
+ int ref_pic_active_num;
+ int ref_pics[EVC_MAX_NUM_REF_PICS];
+ char pic_type;
+
+} RefPicListStruct;
+
+// chromaQP table structure to be signalled in SPS
+typedef struct ChromaQpTable {
+ int chroma_qp_table_present_flag; // u(1)
+ int same_qp_table_for_chroma; // u(1)
+ int global_offset_flag; // u(1)
+ int num_points_in_qp_table_minus1[2]; // ue(v)
+ int delta_qp_in_val_minus1[2][EVC_MAX_QP_TABLE_SIZE]; // u(6)
+ int delta_qp_out_val[2][EVC_MAX_QP_TABLE_SIZE]; // se(v)
+} ChromaQpTable;
+
+// Hypothetical Reference Decoder (HRD) parameters, part of VUI
+typedef struct HRDParameters {
+ int cpb_cnt_minus1; // ue(v)
+ int bit_rate_scale; // u(4)
+ int cpb_size_scale; // u(4)
+ int bit_rate_value_minus1[NUM_CPB]; // ue(v)
+ int cpb_size_value_minus1[NUM_CPB]; // ue(v)
+ int cbr_flag[NUM_CPB]; // u(1)
+ int initial_cpb_removal_delay_length_minus1; // u(5)
+ int cpb_removal_delay_length_minus1; // u(5)
+ int dpb_output_delay_length_minus1; // u(5)
+ int time_offset_length; // u(5)
+} HRDParameters;
+
+// video usability information (VUI) part of SPS
+typedef struct VUIParameters {
+ int aspect_ratio_info_present_flag; // u(1)
+ int aspect_ratio_idc; // u(8)
+ int sar_width; // u(16)
+ int sar_height; // u(16)
+ int overscan_info_present_flag; // u(1)
+ int overscan_appropriate_flag; // u(1)
+ int video_signal_type_present_flag; // u(1)
+ int video_format; // u(3)
+ int video_full_range_flag; // u(1)
+ int colour_description_present_flag; // u(1)
+ int colour_primaries; // u(8)
+ int transfer_characteristics; // u(8)
+ int matrix_coefficients; // u(8)
+ int chroma_loc_info_present_flag; // u(1)
+ int chroma_sample_loc_type_top_field; // ue(v)
+ int chroma_sample_loc_type_bottom_field; // ue(v)
+ int neutral_chroma_indication_flag; // u(1)
+ int field_seq_flag; // u(1)
+ int timing_info_present_flag; // u(1)
+ int num_units_in_tick; // u(32)
+ int time_scale; // u(32)
+ int fixed_pic_rate_flag; // u(1)
+ int nal_hrd_parameters_present_flag; // u(1)
+ int vcl_hrd_parameters_present_flag; // u(1)
+ int low_delay_hrd_flag; // u(1)
+ int pic_struct_present_flag; // u(1)
+ int bitstream_restriction_flag; // u(1)
+ int motion_vectors_over_pic_boundaries_flag; // u(1)
+ int max_bytes_per_pic_denom; // ue(v)
+ int max_bits_per_mb_denom; // ue(v)
+ int log2_max_mv_length_horizontal; // ue(v)
+ int log2_max_mv_length_vertical; // ue(v)
+ int num_reorder_pics; // ue(v)
+ int max_dec_pic_buffering; // ue(v)
+
+ HRDParameters hrd_parameters;
+} VUIParameters;
+
+// The sturcture reflects SPS RBSP(raw byte sequence payload) layout
+// @see ISO_IEC_23094-1 section 7.3.2.1
+//
+// The following descriptors specify the parsing process of each element
+// u(n) - unsigned integer using n bits
+// ue(v) - unsigned integer 0-th order Exp_Golomb-coded syntax element with the left bit first
+typedef struct EVCParserSPS {
+ int sps_seq_parameter_set_id; // ue(v)
+ int profile_idc; // u(8)
+ int level_idc; // u(8)
+ int toolset_idc_h; // u(32)
+ int toolset_idc_l; // u(32)
+ int chroma_format_idc; // ue(v)
+ int pic_width_in_luma_samples; // ue(v)
+ int pic_height_in_luma_samples; // ue(v)
+ int bit_depth_luma_minus8; // ue(v)
+ int bit_depth_chroma_minus8; // ue(v)
+
+ int sps_btt_flag; // u(1)
+ int log2_ctu_size_minus5; // ue(v)
+ int log2_min_cb_size_minus2; // ue(v)
+ int log2_diff_ctu_max_14_cb_size; // ue(v)
+ int log2_diff_ctu_max_tt_cb_size; // ue(v)
+ int log2_diff_min_cb_min_tt_cb_size_minus2; // ue(v)
+
+ int sps_suco_flag; // u(1)
+ int log2_diff_ctu_size_max_suco_cb_size; // ue(v)
+ int log2_diff_max_suco_min_suco_cb_size; // ue(v)
+
+ int sps_admvp_flag; // u(1)
+ int sps_affine_flag; // u(1)
+ int sps_amvr_flag; // u(1)
+ int sps_dmvr_flag; // u(1)
+ int sps_mmvd_flag; // u(1)
+ int sps_hmvp_flag; // u(1)
+
+ int sps_eipd_flag; // u(1)
+ int sps_ibc_flag; // u(1)
+ int log2_max_ibc_cand_size_minus2; // ue(v)
+
+ int sps_cm_init_flag; // u(1)
+ int sps_adcc_flag; // u(1)
+
+ int sps_iqt_flag; // u(1)
+ int sps_ats_flag; // u(1)
+
+ int sps_addb_flag; // u(1)
+ int sps_alf_flag; // u(1)
+ int sps_htdf_flag; // u(1)
+ int sps_rpl_flag; // u(1)
+ int sps_pocs_flag; // u(1)
+ int sps_dquant_flag; // u(1)
+ int sps_dra_flag; // u(1)
+
+ int log2_max_pic_order_cnt_lsb_minus4; // ue(v)
+ int log2_sub_gop_length; // ue(v)
+ int log2_ref_pic_gap_length; // ue(v)
+
+ int max_num_tid0_ref_pics; // ue(v)
+
+ int sps_max_dec_pic_buffering_minus1; // ue(v)
+ int long_term_ref_pic_flag; // u(1)
+ int rpl1_same_as_rpl0_flag; // u(1)
+ int num_ref_pic_list_in_sps[2]; // ue(v)
+ struct RefPicListStruct rpls[2][EVC_MAX_NUM_RPLS];
+
+ int picture_cropping_flag; // u(1)
+ int picture_crop_left_offset; // ue(v)
+ int picture_crop_right_offset; // ue(v)
+ int picture_crop_top_offset; // ue(v)
+ int picture_crop_bottom_offset; // ue(v)
+
+ struct ChromaQpTable chroma_qp_table_struct;
+
+ int vui_parameters_present_flag; // u(1)
+
+ struct VUIParameters vui_parameters;
+
+} EVCParserSPS;
+
+typedef struct EVCParserPPS {
+ int pps_pic_parameter_set_id; // ue(v)
+ int pps_seq_parameter_set_id; // ue(v)
+ int num_ref_idx_default_active_minus1[2]; // ue(v)
+ int additional_lt_poc_lsb_len; // ue(v)
+ int rpl1_idx_present_flag; // u(1)
+ int single_tile_in_pic_flag; // u(1)
+ int num_tile_columns_minus1; // ue(v)
+ int num_tile_rows_minus1; // ue(v)
+ int uniform_tile_spacing_flag; // u(1)
+ int tile_column_width_minus1[EVC_MAX_TILE_ROWS]; // ue(v)
+ int tile_row_height_minus1[EVC_MAX_TILE_COLUMNS]; // ue(v)
+ int loop_filter_across_tiles_enabled_flag; // u(1)
+ int tile_offset_len_minus1; // ue(v)
+ int tile_id_len_minus1; // ue(v)
+ int explicit_tile_id_flag; // u(1)
+ int tile_id_val[EVC_MAX_TILE_ROWS][EVC_MAX_TILE_COLUMNS]; // u(v)
+ int pic_dra_enabled_flag; // u(1)
+ int pic_dra_aps_id; // u(5)
+ int arbitrary_slice_present_flag; // u(1)
+ int constrained_intra_pred_flag; // u(1)
+ int cu_qp_delta_enabled_flag; // u(1)
+ int log2_cu_qp_delta_area_minus6; // ue(v)
+
+} EVCParserPPS;
+
+// The sturcture reflects Slice Header RBSP(raw byte sequence payload) layout
+// @see ISO_IEC_23094-1 section 7.3.2.6
+//
+// The following descriptors specify the parsing process of each element
+// u(n) - unsigned integer using n bits
+// ue(v) - unsigned integer 0-th order Exp_Golomb-coded syntax element with the left bit first
+// u(n) - unsigned integer using n bits.
+// When n is "v" in the syntax table, the number of bits varies in a manner dependent on the value of other syntax elements.
+typedef struct EVCParserSliceHeader {
+ int slice_pic_parameter_set_id; // ue(v)
+ int single_tile_in_slice_flag; // u(1)
+ int first_tile_id; // u(v)
+ int arbitrary_slice_flag; // u(1)
+ int last_tile_id; // u(v)
+ int num_remaining_tiles_in_slice_minus1; // ue(v)
+ int delta_tile_id_minus1[EVC_MAX_TILE_ROWS * EVC_MAX_TILE_COLUMNS]; // ue(v)
+
+ int slice_type; // ue(v)
+ int no_output_of_prior_pics_flag; // u(1)
+ int mmvd_group_enable_flag; // u(1)
+ int slice_alf_enabled_flag; // u(1)
+
+ int slice_alf_luma_aps_id; // u(5)
+ int slice_alf_map_flag; // u(1)
+ int slice_alf_chroma_idc; // u(2)
+ int slice_alf_chroma_aps_id; // u(5)
+ int slice_alf_chroma_map_flag; // u(1)
+ int slice_alf_chroma2_aps_id; // u(5)
+ int slice_alf_chroma2_map_flag; // u(1)
+ int slice_pic_order_cnt_lsb; // u(v)
+
+ // @note
+ // Currently the structure does not reflect the entire Slice Header RBSP layout.
+ // It contains only the fields that are necessary to read from the NAL unit all the values
+ // necessary for the correct initialization of the AVCodecContext structure.
+
+ // @note
+ // If necessary, add the missing fields to the structure to reflect
+ // the contents of the entire NAL unit of the SPS type
+
+} EVCParserSliceHeader;
+
+// picture order count of the current picture
+typedef struct EVCParserPoc {
+ int PicOrderCntVal; // current picture order count value
+ int prevPicOrderCntVal; // the picture order count of the previous Tid0 picture
+ int DocOffset; // the decoding order count of the previous picture
+} EVCParserPoc;
+
+typedef struct EVCParserContext {
+ //ParseContext pc;
+ EVCParserSPS *sps[EVC_MAX_SPS_COUNT];
+ EVCParserPPS *pps[EVC_MAX_PPS_COUNT];
+ EVCParserSliceHeader *slice_header[EVC_MAX_PPS_COUNT];
+
+ EVCParserPoc poc;
+
+ int nuh_temporal_id; // the value of TemporalId (shall be the same for all VCL NAL units of an Access Unit)
+ int nalu_type; // the current NALU type
+
+ // Dimensions of the decoded video intended for presentation.
+ int width;
+ int height;
+
+ // Dimensions of the coded video.
+ int coded_width;
+ int coded_height;
+
+ // The format of the coded data, corresponds to enum AVPixelFormat
+ int format;
+
+ // AV_PICTURE_TYPE_I, EVC_SLICE_TYPE_P, AV_PICTURE_TYPE_B
+ int pict_type;
+
+ // Set by parser to 1 for key frames and 0 for non-key frames
+ int key_frame;
+
+ // Picture number incremented in presentation or output order.
+ // This corresponds to EVCEVCParserPoc::PicOrderCntVal
+ int output_picture_number;
+
+ // profile
+ // 0: FF_PROFILE_EVC_BASELINE
+ // 1: FF_PROFILE_EVC_MAIN
+ int profile;
+
+ // Framerate value in the compressed bitstream
+ AVRational framerate;
+
+ // Number of pictures in a group of pictures
+ int gop_size;
+
+ // Number of frames the decoded output will be delayed relative to the encoded input
+ int delay;
+
+ int parsed_extradata;
+
+} EVCParserContext;
+
+int ff_evc_get_nalu_type(const uint8_t *bits, int bits_size, void *logctx);
+
+uint32_t ff_evc_read_nal_unit_length(const uint8_t *bits, int bits_size, void *logctx);
+
+// nuh_temporal_id specifies a temporal identifier for the NAL unit
+int ff_evc_get_temporal_id(const uint8_t *bits, int bits_size, void *logctx);
+
+// @see ISO_IEC_23094-1 (7.3.2.1 SPS RBSP syntax)
+EVCParserSPS *ff_evc_parse_sps(EVCParserContext *ctx, const uint8_t *bs, int bs_size);
+
+// @see ISO_IEC_23094-1 (7.3.2.2 SPS RBSP syntax)
+EVCParserPPS *ff_evc_parse_pps(EVCParserContext *ctx, const uint8_t *bs, int bs_size);
+
+// @see ISO_IEC_23094-1 (7.3.2.6 Slice layer RBSP syntax)
+EVCParserSliceHeader *ff_evc_parse_slice_header(EVCParserContext *ctx, const uint8_t *bs, int bs_size);
+
+int ff_evc_parse_nal_unit(EVCParserContext *ctx, const uint8_t *buf, int buf_size, void *logctx);
+
+int ff_evc_parse_nal_units(EVCParserContext *ctx, const uint8_t *buf, int buf_size, void *logctx);
+
+#endif /* AVCODEC_EVC_PARSE_H */
new file mode 100644
@@ -0,0 +1,210 @@
+/*
+ * EVC format parser
+ *
+ * Copyright (C) 2021 Dawid Kozinski <d.kozinski@samsung.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "parser.h"
+#include "bytestream.h"
+#include "evc.h"
+#include "evc_parse.h"
+
+/**
+ * Parse NAL units of found picture and decode some basic information.
+ *
+ * @param s parser context.
+ * @param avctx codec context.
+ * @param buf buffer with field/frame data.
+ * @param buf_size size of the buffer.
+ */
+static int parse_nal_units(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t *buf, int buf_size)
+{
+ EVCParserContext *p = s->priv_data;
+
+ int res = ff_evc_parse_nal_units(p, buf, buf_size, avctx);
+ if(!res)
+ return res;
+
+ s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
+
+ if(p->nalu_type == EVC_SPS_NUT) {
+
+ s->coded_width = p->coded_width;
+ s->coded_height = p->coded_height;
+ s->width = p->width;
+ s->height = p->height;
+
+ s->format = p->format;
+
+ avctx->coded_width = s->coded_width;
+ avctx->coded_height = s->coded_height;
+ avctx->width = s->width;
+ avctx->height = s->height;
+
+ avctx->gop_size = p->gop_size;
+ avctx->delay = p->delay;
+ avctx->profile = p->profile;
+
+ avctx->framerate.den = p->framerate.den;
+ avctx->framerate.num = p->framerate.num;
+
+ } else if(p->nalu_type == EVC_NOIDR_NUT) {
+ s->pict_type = p->pict_type;
+ s->key_frame = p->key_frame;
+ s->output_picture_number = p->output_picture_number;
+ }
+
+ return 0;
+}
+// Decoding nal units from evcC (EVCDecoderConfigurationRecord)
+// @see @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.2
+static int decode_extradata(EVCParserContext *ctx, const uint8_t *data, int size, void *logctx)
+{
+ int ret = 0;
+ GetByteContext gb;
+
+ bytestream2_init(&gb, data, size);
+
+ if (!data || size <= 0)
+ return -1;
+
+ // extradata is encoded as evcC format.
+ if (data[0] == 1) {
+ int num_of_arrays; // indicates the number of arrays of NAL units of the indicated type(s)
+
+ int nalu_length_field_size; // indicates the length in bytes of the NALUnitLenght field in EVC video stream sample in the stream
+ // The value of this field shall be one of 0, 1, or 3 corresponding to a length encoded with 1, 2, or 4 bytes, respectively.
+
+ if (bytestream2_get_bytes_left(&gb) < 18) {
+ av_log(logctx, AV_LOG_ERROR, "evcC %d too short\n", size);
+ return AVERROR_INVALIDDATA;
+ }
+
+ bytestream2_skip(&gb, 16);
+
+ // @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
+ // LengthSizeMinusOne plus 1 indicates the length in bytes of the NALUnitLength field in a EVC video stream sample in the stream to which this configuration record applies. For example, a size of one byte is indicated with a value of 0.
+ // The value of this field shall be one of 0, 1, or 3 corresponding to a length encoded with 1, 2, or 4 bytes, respectively.
+ nalu_length_field_size = (bytestream2_get_byte(&gb) & 3) + 1;
+ if( nalu_length_field_size != 1 &&
+ nalu_length_field_size != 2 &&
+ nalu_length_field_size != 4 ) {
+ av_log(logctx, AV_LOG_ERROR, "The length in bytes of the NALUnitLenght field in a EVC video stream has unsupported value of %d\n", nalu_length_field_size);
+ return AVERROR_INVALIDDATA;
+ }
+
+ num_of_arrays = bytestream2_get_byte(&gb);
+
+ /* Decode nal units from evcC. */
+ for (int i = 0; i < num_of_arrays; i++) {
+
+ // @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
+ // NAL_unit_type indicates the type of the NAL units in the following array (which shall be all of that type);
+ // - it takes a value as defined in ISO/IEC 23094-1;
+ // - it is restricted to take one of the values indicating a SPS, PPS, APS, or SEI NAL unit.
+ int nal_unit_type = bytestream2_get_byte(&gb) & 0x3f;
+ int num_nalus = bytestream2_get_be16(&gb);
+
+ for (int j = 0; j < num_nalus; j++) {
+
+ int nal_unit_length = bytestream2_get_be16(&gb);
+
+ if (bytestream2_get_bytes_left(&gb) < nal_unit_length) {
+ av_log(logctx, AV_LOG_ERROR, "Invalid NAL unit size in extradata.\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ if( nal_unit_type == EVC_SPS_NUT ||
+ nal_unit_type == EVC_PPS_NUT ||
+ nal_unit_type == EVC_APS_NUT ||
+ nal_unit_type == EVC_SEI_NUT ) {
+ if (ff_evc_parse_nal_unit(ctx, gb.buffer, nal_unit_length, logctx) != 0) {
+ av_log(logctx, AV_LOG_ERROR, "Parsing of NAL unit failed\n");
+ return AVERROR_INVALIDDATA;
+ }
+ }
+
+ bytestream2_skip(&gb, nal_unit_length);
+ }
+ }
+ } else
+ return -1;
+
+ return ret;
+}
+
+static int evc_parse(AVCodecParserContext *s, AVCodecContext *avctx,
+ const uint8_t **poutbuf, int *poutbuf_size,
+ const uint8_t *buf, int buf_size)
+{
+ int next;
+ EVCParserContext *ctx = s->priv_data;
+
+ if (avctx->extradata && !ctx->parsed_extradata) {
+ decode_extradata(ctx, avctx->extradata, avctx->extradata_size, avctx);
+ ctx->parsed_extradata = 1;
+ }
+
+ next = buf_size;
+
+ parse_nal_units(s, avctx, buf, buf_size);
+
+ // poutbuf contains just one Access Unit
+ *poutbuf = buf;
+ *poutbuf_size = buf_size;
+
+ return next;
+}
+
+static int evc_parser_init(AVCodecParserContext *s)
+{
+ EVCParserContext *ctx = s->priv_data;
+
+ memset(ctx->sps, 0, sizeof(EVCParserSPS *)*EVC_MAX_SPS_COUNT);
+ memset(ctx->pps, 0, sizeof(EVCParserPPS *)*EVC_MAX_PPS_COUNT);
+ memset(ctx->slice_header, 0, sizeof(EVCParserSliceHeader *)*EVC_MAX_PPS_COUNT);
+
+ return 0;
+}
+
+static void evc_parser_close(AVCodecParserContext *s)
+{
+ EVCParserContext *ctx = s->priv_data;
+
+ for(int i = 0; i < EVC_MAX_SPS_COUNT; i++) {
+ EVCParserSPS *sps = ctx->sps[i];
+ av_freep(&sps);
+ }
+
+ for(int i = 0; i < EVC_MAX_PPS_COUNT; i++) {
+ EVCParserPPS *pps = ctx->pps[i];
+ EVCParserSliceHeader *sh = ctx->slice_header[i];
+
+ av_freep(&pps);
+ av_freep(&sh);
+ }
+}
+
+const AVCodecParser ff_evc_parser = {
+ .codec_ids = { AV_CODEC_ID_EVC },
+ .priv_data_size = sizeof(EVCParserContext),
+ .parser_init = evc_parser_init,
+ .parser_parse = evc_parse,
+ .parser_close = evc_parser_close,
+};
@@ -41,6 +41,7 @@ extern const AVCodecParser ff_dvaudio_parser;
extern const AVCodecParser ff_dvbsub_parser;
extern const AVCodecParser ff_dvdsub_parser;
extern const AVCodecParser ff_dvd_nav_parser;
+extern const AVCodecParser ff_evc_parser;
extern const AVCodecParser ff_flac_parser;
extern const AVCodecParser ff_ftr_parser;
extern const AVCodecParser ff_g723_1_parser;
- Added constants definitions for EVC parser - Provided NAL units parsing following ISO_IEC_23094-1 - EVC parser registration Signed-off-by: Dawid Kozinski <d.kozinski@samsung.com> --- configure | 2 + libavcodec/Makefile | 2 + libavcodec/bitstream_filters.c | 5 +- libavcodec/evc.h | 155 ++++++ libavcodec/evc_parse.c | 833 +++++++++++++++++++++++++++++++++ libavcodec/evc_parse.h | 330 +++++++++++++ libavcodec/evc_parser.c | 210 +++++++++ libavcodec/parsers.c | 1 + 8 files changed, 1536 insertions(+), 2 deletions(-) create mode 100644 libavcodec/evc.h create mode 100644 libavcodec/evc_parse.c create mode 100644 libavcodec/evc_parse.h create mode 100644 libavcodec/evc_parser.c