/* * AVS3-P2/IEEE1857.10 video parser. * Copyright (c) 2020 Zhenyu Wang <wangzhenyu@pkusz.edu.cn> *                    Bingjie Han <hanbj@pkusz.edu.cn> *                    Huiwen Ren  <hwrenx@gmail.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 "avs3.h"#include "get_bits.h"#include "parser.h" static int avs3_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){    int pic_found  = pc->frame_start_found;    uint32_t state = pc->state;    int cur = 0;     if (!pic_found) {        for (; cur < buf_size; ++cur) {            state = (state << 8) | buf[cur];            if (AVS3_ISPIC(buf[cur])){                cur++;                pic_found = 1;                break;            }        }    }     if (pic_found) {        if (!buf_size)            return END_NOT_FOUND;        for (; cur < buf_size; ++cur) {            state = (state << 8) | buf[cur];            if ((state & 0xFFFFFF00) == 0x100 && AVS3_ISUNIT(state & 0xFF)) {                pc->frame_start_found = 0;                pc->state = -1;                return cur - 3;            }        }    }     pc->frame_start_found = pic_found;    pc->state = state;     return END_NOT_FOUND;} static void parse_avs3_nal_units(AVCodecParserContext *s, const uint8_t *buf,                           int buf_size, AVCodecContext *avctx){    if (buf_size < 5) {        return;    }     if (buf[0] == 0x0 && buf[1] == 0x0 && buf[2] == 0x1) {        if (buf[3] == AVS3_SEQ_START_CODE) {            GetBitContext gb;            int profile, ratecode;             init_get_bits(&gb, buf + 4, buf_size - 4);             s->key_frame = 1;            s->pict_type = AV_PICTURE_TYPE_I;             profile = get_bits(&gb, 8);            // Skip bits: level(8)            //            progressive(1)            //            field(1)            //            library(2)            //            resv(1)            //            width(14)            //            resv(1)            //            height(14)            //            chroma(2)            //            sampe_precision(3)            skip_bits(&gb, 47);             if (profile == AVS3_PROFILE_BASELINE_MAIN10) {                int sample_precision = get_bits(&gb, 3);                if (sample_precision == 1) {                    avctx->pix_fmt = AV_PIX_FMT_YUV420P;                } else if (sample_precision == 2) {                    avctx->pix_fmt = AV_PIX_FMT_YUV420P10LE;                } else {                    avctx->pix_fmt = AV_PIX_FMT_NONE;                }            }             // Skip bits: resv(1)            //            aspect(4)            skip_bits(&gb, 5);             ratecode = get_bits(&gb, 4);             // Skip bits: resv(1)            //            bitrate_low(18)            //            resv(1)            //            bitrate_high(12)            skip_bits(&gb, 32);             avctx->has_b_frames = !get_bits(&gb, 1);             avctx->framerate.num = avctx->time_base.den = ff_avs3_frame_rate_tab[ratecode].num;            avctx->framerate.den = avctx->time_base.num = ff_avs3_frame_rate_tab[ratecode].den;             s->width  = s->coded_width = avctx->width;            s->height = s->coded_height = avctx->height;             av_log(avctx, AV_LOG_DEBUG,                   "AVS3 parse seq HDR: profile %d; coded size: %dx%d; frame rate code: %d\n",                   profile, avctx->width, avctx->height, ratecode);         } else if (buf[3] == AVS3_INTRA_PIC_START_CODE) {            s->key_frame = 1;            s->pict_type = AV_PICTURE_TYPE_I;        } else if (buf[3] == AVS3_INTER_PIC_START_CODE){            s->key_frame = 0;            if (buf_size > 9) {                int pic_code_type = buf[8] & 0x3;                if (pic_code_type == 1 || pic_code_type == 3) {                    s->pict_type = AV_PICTURE_TYPE_P;                } else {                    s->pict_type = AV_PICTURE_TYPE_B;                }            }        }    }}  static int avs3_parse(AVCodecParserContext *s, AVCodecContext *avctx,                      const uint8_t **poutbuf, int *poutbuf_size,                      const uint8_t *buf, int buf_size){    ParseContext *pc = s->priv_data;    int next;     if (s->flags & PARSER_FLAG_COMPLETE_FRAMES)  {        next = buf_size;    } else {        next = avs3_find_frame_end(pc, buf, buf_size);        if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {            *poutbuf = NULL;            *poutbuf_size = 0;            return buf_size;        }    }     parse_avs3_nal_units(s, buf, buf_size, avctx);     *poutbuf = buf;    *poutbuf_size = buf_size;     return next;} const AVCodecParser ff_avs3_parser = {    .codec_ids      = { AV_CODEC_ID_AVS3 },    .priv_data_size = sizeof(ParseContext),    .parser_parse   = avs3_parse,    .parser_close   = ff_parse_close,};