mirror of
https://github.com/xenia-project/FFmpeg.git
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964f07f68e
Signed-off-by: Will Kelleher <wkelleher@gogoair.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
490 lines
15 KiB
C
490 lines
15 KiB
C
/*
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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 "h2645_parse.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 ADVANCED_PARSER CONFIG_HEVC_DECODER
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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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int parsed_extradata;
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#if ADVANCED_PARSER
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HEVCContext h;
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#endif
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} HEVCParserContext;
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#if !ADVANCED_PARSER
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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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GetBitContext *gb = &nal->gb;
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HEVCPPS *pps;
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HEVCSPS *sps;
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unsigned int pps_id;
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get_bits1(gb); // first slice in pic
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if (IS_IRAP_NAL(nal))
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get_bits1(gb); // no output of prior pics
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pps_id = get_ue_golomb_long(gb);
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if (pps_id >= MAX_PPS_COUNT || !ctx->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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pps = (HEVCPPS*)ctx->ps.pps_list[pps_id]->data;
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sps = (HEVCSPS*)ctx->ps.sps_list[pps->sps_id]->data;
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/* export the stream parameters */
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s->coded_width = sps->width;
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s->coded_height = sps->height;
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s->width = sps->output_width;
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s->height = sps->output_height;
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s->format = sps->pix_fmt;
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avctx->profile = sps->ptl.general_ptl.profile_idc;
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avctx->level = sps->ptl.general_ptl.level_idc;
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/* ignore the rest for now*/
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return 0;
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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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int ret, i;
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ret = ff_h2645_packet_split(&ctx->pkt, buf, buf_size, avctx, 0, 0,
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AV_CODEC_ID_HEVC);
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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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/* ignore everything except parameter sets and VCL NALUs */
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switch (nal->type) {
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case NAL_VPS: ff_hevc_decode_nal_vps(&nal->gb, avctx, &ctx->ps); break;
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case NAL_SPS: ff_hevc_decode_nal_sps(&nal->gb, avctx, &ctx->ps, 1); break;
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case NAL_PPS: ff_hevc_decode_nal_pps(&nal->gb, avctx, &ctx->ps); break;
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case NAL_TRAIL_R:
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case NAL_TRAIL_N:
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case NAL_TSA_N:
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case NAL_TSA_R:
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case NAL_STSA_N:
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case NAL_STSA_R:
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case NAL_BLA_W_LP:
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case NAL_BLA_W_RADL:
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case NAL_BLA_N_LP:
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case NAL_IDR_W_RADL:
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case NAL_IDR_N_LP:
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case NAL_CRA_NUT:
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case NAL_RADL_N:
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case NAL_RADL_R:
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case NAL_RASL_N:
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case NAL_RASL_R:
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if (buf == avctx->extradata) {
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av_log(avctx, AV_LOG_ERROR, "Invalid NAL unit: %d\n", nal->type);
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return AVERROR_INVALIDDATA;
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}
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hevc_parse_slice_header(s, nal, avctx);
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break;
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}
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}
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return 0;
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}
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#endif
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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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int i;
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ParseContext *pc = s->priv_data;
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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 >= NAL_VPS && nut <= NAL_AUD) || nut == 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 <= NAL_RASL_R ||
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(nut >= NAL_BLA_W_LP && nut <= 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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#if ADVANCED_PARSER
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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 inline 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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HEVCContext *h = &ctx->h;
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GetBitContext *gb;
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SliceHeader *sh = &h->sh;
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HEVCParamSets *ps = &h->ps;
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H2645Packet *pkt = &ctx->pkt;
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const uint8_t *buf_end = buf + buf_size;
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int state = -1, i;
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H2645NAL *nal;
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int is_global = buf == avctx->extradata;
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if (!h->HEVClc)
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h->HEVClc = av_mallocz(sizeof(HEVCLocalContext));
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if (!h->HEVClc)
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return AVERROR(ENOMEM);
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gb = &h->HEVClc->gb;
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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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h->avctx = avctx;
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ff_hevc_reset_sei(h);
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if (!buf_size)
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return 0;
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if (pkt->nals_allocated < 1) {
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H2645NAL *tmp = av_realloc_array(pkt->nals, 1, sizeof(*tmp));
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if (!tmp)
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return AVERROR(ENOMEM);
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pkt->nals = tmp;
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memset(pkt->nals, 0, sizeof(*tmp));
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pkt->nals_allocated = 1;
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}
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nal = &pkt->nals[0];
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for (;;) {
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int src_length, consumed;
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int ret;
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buf = avpriv_find_start_code(buf, buf_end, &state);
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if (--buf + 2 >= buf_end)
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break;
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src_length = buf_end - buf;
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h->nal_unit_type = (*buf >> 1) & 0x3f;
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h->temporal_id = (*(buf + 1) & 0x07) - 1;
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if (h->nal_unit_type <= NAL_CRA_NUT) {
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// Do not walk the whole buffer just to decode slice segment header
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if (src_length > 20)
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src_length = 20;
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}
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consumed = ff_h2645_extract_rbsp(buf, src_length, nal);
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if (consumed < 0)
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return consumed;
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ret = init_get_bits8(gb, nal->data + 2, nal->size);
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if (ret < 0)
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return ret;
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switch (h->nal_unit_type) {
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case NAL_VPS:
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ff_hevc_decode_nal_vps(gb, avctx, ps);
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break;
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case 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 NAL_PPS:
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ff_hevc_decode_nal_pps(gb, avctx, ps);
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break;
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case NAL_SEI_PREFIX:
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case NAL_SEI_SUFFIX:
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ff_hevc_decode_nal_sei(h);
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break;
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case NAL_TRAIL_N:
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case NAL_TRAIL_R:
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case NAL_TSA_N:
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case NAL_TSA_R:
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case NAL_STSA_N:
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case NAL_STSA_R:
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case NAL_RADL_N:
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case NAL_RADL_R:
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case NAL_RASL_N:
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case NAL_RASL_R:
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case NAL_BLA_W_LP:
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case NAL_BLA_W_RADL:
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case NAL_BLA_N_LP:
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case NAL_IDR_W_RADL:
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case NAL_IDR_N_LP:
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case NAL_CRA_NUT:
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if (is_global) {
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av_log(avctx, AV_LOG_ERROR, "Invalid NAL unit: %d\n", h->nal_unit_type);
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return AVERROR_INVALIDDATA;
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}
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sh->first_slice_in_pic_flag = get_bits1(gb);
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s->picture_structure = h->picture_struct;
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s->field_order = h->picture_struct;
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if (IS_IRAP(h)) {
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s->key_frame = 1;
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sh->no_output_of_prior_pics_flag = get_bits1(gb);
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}
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sh->pps_id = get_ue_golomb(gb);
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if (sh->pps_id >= MAX_PPS_COUNT || !ps->pps_list[sh->pps_id]) {
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av_log(avctx, AV_LOG_ERROR, "PPS id out of range: %d\n", sh->pps_id);
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return AVERROR_INVALIDDATA;
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}
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ps->pps = (HEVCPPS*)ps->pps_list[sh->pps_id]->data;
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if (ps->pps->sps_id >= 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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if (!sh->first_slice_in_pic_flag) {
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int slice_address_length;
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if (ps->pps->dependent_slice_segments_enabled_flag)
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sh->dependent_slice_segment_flag = get_bits1(gb);
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else
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sh->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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sh->slice_segment_addr = get_bitsz(gb, slice_address_length);
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if (sh->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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sh->slice_segment_addr);
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return AVERROR_INVALIDDATA;
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}
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} else
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sh->dependent_slice_segment_flag = 0;
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if (sh->dependent_slice_segment_flag)
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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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sh->slice_type = get_ue_golomb(gb);
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if (!(sh->slice_type == I_SLICE || sh->slice_type == P_SLICE ||
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sh->slice_type == B_SLICE)) {
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av_log(avctx, AV_LOG_ERROR, "Unknown slice type: %d.\n",
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sh->slice_type);
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return AVERROR_INVALIDDATA;
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}
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s->pict_type = sh->slice_type == B_SLICE ? AV_PICTURE_TYPE_B :
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sh->slice_type == P_SLICE ? 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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sh->pic_output_flag = get_bits1(gb);
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if (ps->sps->separate_colour_plane_flag)
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sh->colour_plane_id = get_bits(gb, 2);
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if (!IS_IDR(h)) {
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sh->pic_order_cnt_lsb = get_bits(gb, ps->sps->log2_max_poc_lsb);
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s->output_picture_number = h->poc = ff_hevc_compute_poc(h, sh->pic_order_cnt_lsb);
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} else
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s->output_picture_number = h->poc = 0;
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if (h->temporal_id == 0 &&
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h->nal_unit_type != NAL_TRAIL_N &&
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h->nal_unit_type != NAL_TSA_N &&
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h->nal_unit_type != NAL_STSA_N &&
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h->nal_unit_type != NAL_RADL_N &&
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h->nal_unit_type != NAL_RASL_N &&
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h->nal_unit_type != NAL_RADL_R &&
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h->nal_unit_type != NAL_RASL_R)
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h->pocTid0 = h->poc;
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return 0; /* no need to evaluate the rest */
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}
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buf += consumed;
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}
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/* didn't find a picture! */
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if (!is_global)
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av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit\n");
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return -1;
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}
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#endif
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static int hevc_parse(AVCodecParserContext *s,
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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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if (avctx->extradata && !ctx->parsed_extradata) {
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parse_nal_units(s, avctx->extradata, avctx->extradata_size, 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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parse_nal_units(s, buf, buf_size, avctx);
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*poutbuf = buf;
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*poutbuf_size = buf_size;
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return next;
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}
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// Split after the parameter sets at the beginning of the stream if they exist.
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static int hevc_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
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{
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const uint8_t *ptr = buf, *end = buf + buf_size;
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uint32_t state = -1;
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int has_vps = 0;
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int has_sps = 0;
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int has_pps = 0;
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int nut;
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while (ptr < end) {
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ptr = avpriv_find_start_code(ptr, end, &state);
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if ((state >> 8) != START_CODE)
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break;
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nut = (state >> 1) & 0x3F;
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if (nut == NAL_VPS)
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has_vps = 1;
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else if (nut == NAL_SPS)
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has_sps = 1;
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else if (nut == NAL_PPS)
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has_pps = 1;
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else if ((nut != NAL_SEI_PREFIX || has_pps) &&
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nut != NAL_AUD) {
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if (has_vps && has_sps) {
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while (ptr - 4 > buf && ptr[-5] == 0)
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ptr--;
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return ptr - 4 - buf;
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}
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}
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}
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return 0;
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}
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static void hevc_parser_close(AVCodecParserContext *s)
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{
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HEVCParserContext *ctx = s->priv_data;
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int i;
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#if ADVANCED_PARSER
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HEVCContext *h = &ctx->h;
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for (i = 0; i < FF_ARRAY_ELEMS(h->ps.vps_list); i++)
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av_buffer_unref(&h->ps.vps_list[i]);
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for (i = 0; i < FF_ARRAY_ELEMS(h->ps.sps_list); i++)
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av_buffer_unref(&h->ps.sps_list[i]);
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for (i = 0; i < FF_ARRAY_ELEMS(h->ps.pps_list); i++)
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av_buffer_unref(&h->ps.pps_list[i]);
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h->ps.sps = NULL;
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av_freep(&h->HEVClc);
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#endif
|
|
|
|
for (i = 0; i < FF_ARRAY_ELEMS(ctx->ps.vps_list); i++)
|
|
av_buffer_unref(&ctx->ps.vps_list[i]);
|
|
for (i = 0; i < FF_ARRAY_ELEMS(ctx->ps.sps_list); i++)
|
|
av_buffer_unref(&ctx->ps.sps_list[i]);
|
|
for (i = 0; i < FF_ARRAY_ELEMS(ctx->ps.pps_list); i++)
|
|
av_buffer_unref(&ctx->ps.pps_list[i]);
|
|
|
|
ctx->ps.sps = NULL;
|
|
|
|
ff_h2645_packet_uninit(&ctx->pkt);
|
|
|
|
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,
|
|
};
|