/* * DNxHD/VC-3 parser * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr> * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * DNxHD/VC-3 parser */ #include "parser.h" #define DNXHD_HEADER_PREFIX 0x0000028001 static int dnxhd_find_frame_end(ParseContext *pc,                                const uint8_t *buf, int buf_size){    uint64_t state = pc->state64;    int pic_found = pc->frame_start_found;    int i = 0;     if (!pic_found) {        for (i = 0; i < buf_size; i++) {            state = (state<<8) | buf[i];            if ((state & 0xffffffffffLL) == DNXHD_HEADER_PREFIX) {                i++;                pic_found = 1;                break;            }        }    }     if (pic_found) {        if (!buf_size) /* EOF considered as end of frame */            return 0;        for (; i < buf_size; i++) {            state = (state<<8) | buf[i];            if ((state & 0xffffffffffLL) == DNXHD_HEADER_PREFIX) {                pc->frame_start_found = 0;                pc->state64 = -1;                return i-4;            }        }    }    pc->frame_start_found = pic_found;    pc->state64 = state;    return END_NOT_FOUND;} static int dnxhd_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 = dnxhd_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;        }    }    *poutbuf = buf;    *poutbuf_size = buf_size;    return next;} AVCodecParser ff_dnxhd_parser = {    .codec_ids      = { CODEC_ID_DNXHD },    .priv_data_size = sizeof(ParseContext),    .parser_parse   = dnxhd_parse,    .parser_close   = ff_parse_close,};