GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/avs3_parser.c Lines: 0 72 0.0 %
Date: 2020-10-23 17:01:47 Branches: 0 52 0.0 %

Line Branch Exec Source
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/*
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 * AVS3-P2/IEEE1857.10 video parser.
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 * Copyright (c) 2020 Zhenyu Wang <wangzhenyu@pkusz.edu.cn>
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 *                    Bingjie Han <hanbj@pkusz.edu.cn>
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 *                    Huiwen Ren  <hwrenx@gmail.com>
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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 "avs3.h"
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#include "get_bits.h"
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#include "parser.h"
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static int avs3_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
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{
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    int pic_found  = pc->frame_start_found;
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    uint32_t state = pc->state;
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    int cur = 0;
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    if (!pic_found) {
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        for (; cur < buf_size; ++cur) {
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            state = (state << 8) | buf[cur];
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            if (AVS3_ISPIC(buf[cur])){
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                cur++;
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                pic_found = 1;
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                break;
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            }
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        }
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    }
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    if (pic_found) {
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        if (!buf_size)
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            return END_NOT_FOUND;
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        for (; cur < buf_size; ++cur) {
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            state = (state << 8) | buf[cur];
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            if ((state & 0xFFFFFF00) == 0x100 && AVS3_ISUNIT(state & 0xFF)) {
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                pc->frame_start_found = 0;
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                pc->state = -1;
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                return cur - 3;
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            }
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        }
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    }
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    pc->frame_start_found = pic_found;
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    pc->state = state;
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    return END_NOT_FOUND;
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}
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static void parse_avs3_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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    if (buf_size < 5) {
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        return;
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    }
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    if (buf[0] == 0x0 && buf[1] == 0x0 && buf[2] == 0x1) {
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        if (buf[3] == AVS3_SEQ_START_CODE) {
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            GetBitContext gb;
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            int profile, ratecode;
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            init_get_bits(&gb, buf + 4, buf_size - 4);
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            s->key_frame = 1;
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            s->pict_type = AV_PICTURE_TYPE_I;
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            profile = get_bits(&gb, 8);
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            // Skip bits: level(8)
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            //            progressive(1)
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            //            field(1)
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            //            library(2)
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            //            resv(1)
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            //            width(14)
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            //            resv(1)
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            //            height(14)
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            //            chroma(2)
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            //            sampe_precision(3)
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            skip_bits(&gb, 47);
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            if (profile == AVS3_PROFILE_BASELINE_MAIN10) {
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                int sample_precision = get_bits(&gb, 3);
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                if (sample_precision == 1) {
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                    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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                } else if (sample_precision == 2) {
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                    avctx->pix_fmt = AV_PIX_FMT_YUV420P10LE;
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                } else {
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                    avctx->pix_fmt = AV_PIX_FMT_NONE;
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                }
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            }
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            // Skip bits: resv(1)
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            //            aspect(4)
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            skip_bits(&gb, 5);
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            ratecode = get_bits(&gb, 4);
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            // Skip bits: resv(1)
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            //            bitrate_low(18)
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            //            resv(1)
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            //            bitrate_high(12)
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            skip_bits(&gb, 32);
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            avctx->has_b_frames = !get_bits(&gb, 1);
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            avctx->framerate.num = avctx->time_base.den = ff_avs3_frame_rate_tab[ratecode].num;
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            avctx->framerate.den = avctx->time_base.num = ff_avs3_frame_rate_tab[ratecode].den;
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            s->width  = s->coded_width = avctx->width;
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            s->height = s->coded_height = avctx->height;
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            av_log(avctx, AV_LOG_DEBUG,
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                   "AVS3 parse seq HDR: profile %d; coded size: %dx%d; frame rate code: %d\n",
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                   profile, avctx->width, avctx->height, ratecode);
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        } else if (buf[3] == AVS3_INTRA_PIC_START_CODE) {
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            s->key_frame = 1;
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            s->pict_type = AV_PICTURE_TYPE_I;
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        } else if (buf[3] == AVS3_INTER_PIC_START_CODE){
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            s->key_frame = 0;
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            if (buf_size > 9) {
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                int pic_code_type = buf[8] & 0x3;
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                if (pic_code_type == 1 || pic_code_type == 3) {
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                    s->pict_type = AV_PICTURE_TYPE_P;
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                } else {
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                    s->pict_type = AV_PICTURE_TYPE_B;
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                }
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            }
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        }
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    }
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}
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static int avs3_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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    ParseContext *pc = s->priv_data;
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    int next;
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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 = avs3_find_frame_end(pc, 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_avs3_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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AVCodecParser ff_avs3_parser = {
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    .codec_ids      = { AV_CODEC_ID_AVS3 },
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    .priv_data_size = sizeof(ParseContext),
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    .parser_parse   = avs3_parse,
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    .parser_close   = ff_parse_close,
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    .split          = ff_mpeg4video_split,
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};