117 lines
3.2 KiB
C
117 lines
3.2 KiB
C
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/*
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* DPX parser
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* Copyright (c) 2013 Paul B Mahol
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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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/**
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* @file
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* DPX parser
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*/
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#include "libavutil/bswap.h"
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#include "libavutil/common.h"
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#include "parser.h"
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typedef struct DPXParseContext {
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ParseContext pc;
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uint32_t index;
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uint32_t fsize;
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uint32_t remaining_size;
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int is_be;
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} DPXParseContext;
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static int dpx_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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DPXParseContext *d = s->priv_data;
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uint32_t state = d->pc.state;
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int next = END_NOT_FOUND;
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int i = 0;
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s->pict_type = AV_PICTURE_TYPE_I;
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*poutbuf_size = 0;
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if (buf_size == 0)
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next = 0;
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if (!d->pc.frame_start_found) {
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for (; i < buf_size; i++) {
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state = (state << 8) | buf[i];
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if (state == MKBETAG('S','D','P','X') ||
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state == MKTAG('S','D','P','X')) {
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d->pc.frame_start_found = 1;
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d->is_be = state == MKBETAG('S','D','P','X');
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d->index = 0;
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break;
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}
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}
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d->pc.state = state;
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} else {
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if (d->remaining_size) {
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i = FFMIN(d->remaining_size, buf_size);
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d->remaining_size -= i;
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if (d->remaining_size)
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goto flush;
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}
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}
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for (; d->pc.frame_start_found && i < buf_size; i++) {
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d->pc.state = (d->pc.state << 8) | buf[i];
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d->index++;
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if (d->index == 17) {
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d->fsize = d->is_be ? d->pc.state : av_bswap32(d->pc.state);
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if (d->fsize <= 1664) {
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d->pc.frame_start_found = 0;
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goto flush;
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}
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if (d->fsize > buf_size - i + 19)
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d->remaining_size = d->fsize - buf_size + i - 19;
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else
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i += d->fsize - 19;
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break;
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} else if (d->index > 17) {
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if (d->pc.state == MKBETAG('S','D','P','X') ||
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d->pc.state == MKTAG('S','D','P','X')) {
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next = i - 3;
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break;
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}
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}
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}
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flush:
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if (ff_combine_frame(&d->pc, next, &buf, &buf_size) < 0)
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return buf_size;
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d->pc.frame_start_found = 0;
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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_dpx_parser = {
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.codec_ids = { AV_CODEC_ID_DPX },
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.priv_data_size = sizeof(DPXParseContext),
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.parser_parse = dpx_parse,
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.parser_close = ff_parse_close,
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};
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