390 lines
12 KiB
C
390 lines
12 KiB
C
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/*
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* HEVC Annex B format parser
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*
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* Copyright (C) 2012 - 2013 Guillaume Martres
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/common.h"
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#include "golomb.h"
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#include "hevc.h"
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#include "hevc_parse.h"
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#include "hevc_ps.h"
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#include "hevc_sei.h"
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#include "h2645_parse.h"
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#include "internal.h"
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#include "parser.h"
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#define START_CODE 0x000001 ///< start_code_prefix_one_3bytes
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#define IS_IRAP_NAL(nal) (nal->type >= 16 && nal->type <= 23)
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#define IS_IDR_NAL(nal) (nal->type == HEVC_NAL_IDR_W_RADL || nal->type == HEVC_NAL_IDR_N_LP)
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typedef struct HEVCParserContext {
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ParseContext pc;
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H2645Packet pkt;
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HEVCParamSets ps;
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HEVCSEI sei;
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int is_avc;
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int nal_length_size;
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int parsed_extradata;
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int poc;
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int pocTid0;
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} HEVCParserContext;
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static int hevc_parse_slice_header(AVCodecParserContext *s, H2645NAL *nal,
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AVCodecContext *avctx)
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{
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HEVCParserContext *ctx = s->priv_data;
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HEVCParamSets *ps = &ctx->ps;
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HEVCSEI *sei = &ctx->sei;
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GetBitContext *gb = &nal->gb;
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const HEVCWindow *ow;
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int i, num = 0, den = 0;
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unsigned int pps_id, first_slice_in_pic_flag, dependent_slice_segment_flag;
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enum HEVCSliceType slice_type;
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first_slice_in_pic_flag = get_bits1(gb);
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s->picture_structure = sei->picture_timing.picture_struct;
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s->field_order = sei->picture_timing.picture_struct;
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if (IS_IRAP_NAL(nal)) {
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s->key_frame = 1;
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skip_bits1(gb); // no_output_of_prior_pics_flag
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}
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pps_id = get_ue_golomb(gb);
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if (pps_id >= HEVC_MAX_PPS_COUNT || !ps->pps_list[pps_id]) {
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av_log(avctx, AV_LOG_ERROR, "PPS id out of range: %d\n", pps_id);
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return AVERROR_INVALIDDATA;
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}
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ps->pps = (HEVCPPS*)ps->pps_list[pps_id]->data;
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if (ps->pps->sps_id >= HEVC_MAX_SPS_COUNT || !ps->sps_list[ps->pps->sps_id]) {
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av_log(avctx, AV_LOG_ERROR, "SPS id out of range: %d\n", ps->pps->sps_id);
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return AVERROR_INVALIDDATA;
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}
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if (ps->sps != (HEVCSPS*)ps->sps_list[ps->pps->sps_id]->data) {
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ps->sps = (HEVCSPS*)ps->sps_list[ps->pps->sps_id]->data;
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ps->vps = (HEVCVPS*)ps->vps_list[ps->sps->vps_id]->data;
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}
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ow = &ps->sps->output_window;
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s->coded_width = ps->sps->width;
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s->coded_height = ps->sps->height;
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s->width = ps->sps->width - ow->left_offset - ow->right_offset;
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s->height = ps->sps->height - ow->top_offset - ow->bottom_offset;
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s->format = ps->sps->pix_fmt;
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avctx->profile = ps->sps->ptl.general_ptl.profile_idc;
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avctx->level = ps->sps->ptl.general_ptl.level_idc;
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if (ps->vps->vps_timing_info_present_flag) {
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num = ps->vps->vps_num_units_in_tick;
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den = ps->vps->vps_time_scale;
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} else if (ps->sps->vui.vui_timing_info_present_flag) {
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num = ps->sps->vui.vui_num_units_in_tick;
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den = ps->sps->vui.vui_time_scale;
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}
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if (num != 0 && den != 0)
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av_reduce(&avctx->framerate.den, &avctx->framerate.num,
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num, den, 1 << 30);
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if (!first_slice_in_pic_flag) {
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unsigned int slice_segment_addr;
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int slice_address_length;
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if (ps->pps->dependent_slice_segments_enabled_flag)
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dependent_slice_segment_flag = get_bits1(gb);
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else
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dependent_slice_segment_flag = 0;
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slice_address_length = av_ceil_log2_c(ps->sps->ctb_width *
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ps->sps->ctb_height);
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slice_segment_addr = get_bitsz(gb, slice_address_length);
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if (slice_segment_addr >= ps->sps->ctb_width * ps->sps->ctb_height) {
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av_log(avctx, AV_LOG_ERROR, "Invalid slice segment address: %u.\n",
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slice_segment_addr);
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return AVERROR_INVALIDDATA;
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}
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} else
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dependent_slice_segment_flag = 0;
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if (dependent_slice_segment_flag)
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return 0; /* break; */
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for (i = 0; i < ps->pps->num_extra_slice_header_bits; i++)
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skip_bits(gb, 1); // slice_reserved_undetermined_flag[]
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slice_type = get_ue_golomb(gb);
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if (!(slice_type == HEVC_SLICE_I || slice_type == HEVC_SLICE_P ||
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slice_type == HEVC_SLICE_B)) {
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av_log(avctx, AV_LOG_ERROR, "Unknown slice type: %d.\n",
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slice_type);
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return AVERROR_INVALIDDATA;
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}
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s->pict_type = slice_type == HEVC_SLICE_B ? AV_PICTURE_TYPE_B :
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slice_type == HEVC_SLICE_P ? AV_PICTURE_TYPE_P :
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AV_PICTURE_TYPE_I;
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if (ps->pps->output_flag_present_flag)
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skip_bits1(gb); // pic_output_flag
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if (ps->sps->separate_colour_plane_flag)
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skip_bits(gb, 2); // colour_plane_id
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if (!IS_IDR_NAL(nal)) {
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int pic_order_cnt_lsb = get_bits(gb, ps->sps->log2_max_poc_lsb);
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s->output_picture_number = ctx->poc =
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ff_hevc_compute_poc(ps->sps, ctx->pocTid0, pic_order_cnt_lsb, nal->type);
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} else
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s->output_picture_number = ctx->poc = 0;
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if (nal->temporal_id == 0 &&
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nal->type != HEVC_NAL_TRAIL_N &&
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nal->type != HEVC_NAL_TSA_N &&
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nal->type != HEVC_NAL_STSA_N &&
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nal->type != HEVC_NAL_RADL_N &&
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nal->type != HEVC_NAL_RASL_N &&
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nal->type != HEVC_NAL_RADL_R &&
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nal->type != HEVC_NAL_RASL_R)
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ctx->pocTid0 = ctx->poc;
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return 1; /* no need to evaluate the rest */
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}
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/**
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* Parse NAL units of found picture and decode some basic information.
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*
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* @param s parser context.
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* @param avctx codec context.
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* @param buf buffer with field/frame data.
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* @param buf_size size of the buffer.
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*/
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static int parse_nal_units(AVCodecParserContext *s, const uint8_t *buf,
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int buf_size, AVCodecContext *avctx)
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{
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HEVCParserContext *ctx = s->priv_data;
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HEVCParamSets *ps = &ctx->ps;
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HEVCSEI *sei = &ctx->sei;
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int ret, i;
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/* set some sane default values */
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s->pict_type = AV_PICTURE_TYPE_I;
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s->key_frame = 0;
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s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
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ff_hevc_reset_sei(sei);
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ret = ff_h2645_packet_split(&ctx->pkt, buf, buf_size, avctx, ctx->is_avc,
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ctx->nal_length_size, AV_CODEC_ID_HEVC, 1, 0);
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if (ret < 0)
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return ret;
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for (i = 0; i < ctx->pkt.nb_nals; i++) {
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H2645NAL *nal = &ctx->pkt.nals[i];
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GetBitContext *gb = &nal->gb;
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if (nal->nuh_layer_id > 0)
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continue;
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switch (nal->type) {
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case HEVC_NAL_VPS:
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ff_hevc_decode_nal_vps(gb, avctx, ps);
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break;
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case HEVC_NAL_SPS:
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ff_hevc_decode_nal_sps(gb, avctx, ps, 1);
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break;
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case HEVC_NAL_PPS:
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ff_hevc_decode_nal_pps(gb, avctx, ps);
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break;
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case HEVC_NAL_SEI_PREFIX:
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case HEVC_NAL_SEI_SUFFIX:
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ff_hevc_decode_nal_sei(gb, avctx, sei, ps, nal->type);
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break;
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case HEVC_NAL_TRAIL_N:
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case HEVC_NAL_TRAIL_R:
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case HEVC_NAL_TSA_N:
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case HEVC_NAL_TSA_R:
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case HEVC_NAL_STSA_N:
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case HEVC_NAL_STSA_R:
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case HEVC_NAL_BLA_W_LP:
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case HEVC_NAL_BLA_W_RADL:
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case HEVC_NAL_BLA_N_LP:
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case HEVC_NAL_IDR_W_RADL:
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case HEVC_NAL_IDR_N_LP:
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case HEVC_NAL_CRA_NUT:
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case HEVC_NAL_RADL_N:
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case HEVC_NAL_RADL_R:
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case HEVC_NAL_RASL_N:
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case HEVC_NAL_RASL_R:
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if (ctx->sei.picture_timing.picture_struct == HEVC_SEI_PIC_STRUCT_FRAME_DOUBLING) {
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s->repeat_pict = 1;
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} else if (ctx->sei.picture_timing.picture_struct == HEVC_SEI_PIC_STRUCT_FRAME_TRIPLING) {
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s->repeat_pict = 2;
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}
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ret = hevc_parse_slice_header(s, nal, avctx);
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if (ret)
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return ret;
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break;
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}
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}
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/* didn't find a picture! */
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av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
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return -1;
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}
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/**
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* Find the end of the current frame in the bitstream.
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* @return the position of the first byte of the next frame, or END_NOT_FOUND
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*/
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static int hevc_find_frame_end(AVCodecParserContext *s, const uint8_t *buf,
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int buf_size)
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{
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HEVCParserContext *ctx = s->priv_data;
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ParseContext *pc = &ctx->pc;
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int i;
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for (i = 0; i < buf_size; i++) {
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int nut;
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pc->state64 = (pc->state64 << 8) | buf[i];
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if (((pc->state64 >> 3 * 8) & 0xFFFFFF) != START_CODE)
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continue;
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nut = (pc->state64 >> 2 * 8 + 1) & 0x3F;
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// Beginning of access unit
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if ((nut >= HEVC_NAL_VPS && nut <= HEVC_NAL_EOB_NUT) || nut == HEVC_NAL_SEI_PREFIX ||
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(nut >= 41 && nut <= 44) || (nut >= 48 && nut <= 55)) {
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if (pc->frame_start_found) {
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pc->frame_start_found = 0;
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return i - 5;
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}
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} else if (nut <= HEVC_NAL_RASL_R ||
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(nut >= HEVC_NAL_BLA_W_LP && nut <= HEVC_NAL_CRA_NUT)) {
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int first_slice_segment_in_pic_flag = buf[i] >> 7;
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if (first_slice_segment_in_pic_flag) {
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if (!pc->frame_start_found) {
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pc->frame_start_found = 1;
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} else { // First slice of next frame found
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pc->frame_start_found = 0;
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return i - 5;
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}
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}
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}
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}
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return END_NOT_FOUND;
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}
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static int hevc_parse(AVCodecParserContext *s, AVCodecContext *avctx,
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const uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size)
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{
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int next;
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HEVCParserContext *ctx = s->priv_data;
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ParseContext *pc = &ctx->pc;
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int is_dummy_buf = !buf_size;
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const uint8_t *dummy_buf = buf;
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if (avctx->extradata && !ctx->parsed_extradata) {
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ff_hevc_decode_extradata(avctx->extradata, avctx->extradata_size, &ctx->ps, &ctx->sei,
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&ctx->is_avc, &ctx->nal_length_size, avctx->err_recognition,
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1, avctx);
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ctx->parsed_extradata = 1;
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}
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if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
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next = buf_size;
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} else {
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next = hevc_find_frame_end(s, buf, buf_size);
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if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
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*poutbuf = NULL;
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*poutbuf_size = 0;
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return buf_size;
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}
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}
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is_dummy_buf &= (dummy_buf == buf);
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if (!is_dummy_buf)
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parse_nal_units(s, buf, buf_size, avctx);
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*poutbuf = buf;
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||
|
|
*poutbuf_size = buf_size;
|
||
|
|
return next;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Split after the parameter sets at the beginning of the stream if they exist.
|
||
|
|
static int hevc_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
|
||
|
|
{
|
||
|
|
const uint8_t *ptr = buf, *end = buf + buf_size;
|
||
|
|
uint32_t state = -1;
|
||
|
|
int has_vps = 0;
|
||
|
|
int has_sps = 0;
|
||
|
|
int has_pps = 0;
|
||
|
|
int nut;
|
||
|
|
|
||
|
|
while (ptr < end) {
|
||
|
|
ptr = avpriv_find_start_code(ptr, end, &state);
|
||
|
|
if ((state >> 8) != START_CODE)
|
||
|
|
break;
|
||
|
|
nut = (state >> 1) & 0x3F;
|
||
|
|
if (nut == HEVC_NAL_VPS)
|
||
|
|
has_vps = 1;
|
||
|
|
else if (nut == HEVC_NAL_SPS)
|
||
|
|
has_sps = 1;
|
||
|
|
else if (nut == HEVC_NAL_PPS)
|
||
|
|
has_pps = 1;
|
||
|
|
else if ((nut != HEVC_NAL_SEI_PREFIX || has_pps) &&
|
||
|
|
nut != HEVC_NAL_AUD) {
|
||
|
|
if (has_vps && has_sps) {
|
||
|
|
while (ptr - 4 > buf && ptr[-5] == 0)
|
||
|
|
ptr--;
|
||
|
|
return ptr - 4 - buf;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void hevc_parser_close(AVCodecParserContext *s)
|
||
|
|
{
|
||
|
|
HEVCParserContext *ctx = s->priv_data;
|
||
|
|
|
||
|
|
ff_hevc_ps_uninit(&ctx->ps);
|
||
|
|
ff_h2645_packet_uninit(&ctx->pkt);
|
||
|
|
ff_hevc_reset_sei(&ctx->sei);
|
||
|
|
|
||
|
|
av_freep(&ctx->pc.buffer);
|
||
|
|
}
|
||
|
|
|
||
|
|
AVCodecParser ff_hevc_parser = {
|
||
|
|
.codec_ids = { AV_CODEC_ID_HEVC },
|
||
|
|
.priv_data_size = sizeof(HEVCParserContext),
|
||
|
|
.parser_parse = hevc_parse,
|
||
|
|
.parser_close = hevc_parser_close,
|
||
|
|
.split = hevc_split,
|
||
|
|
};
|