107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
/*
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* XBM parser
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* Copyright (c) 2021 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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* XBM parser
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*/
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#include "libavutil/common.h"
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#include "parser.h"
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typedef struct XBMParseContext {
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ParseContext pc;
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uint16_t state16;
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int count;
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} XBMParseContext;
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#define KEY (((uint64_t)'\n' << 56) | ((uint64_t)'#' << 48) | \
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((uint64_t)'d' << 40) | ((uint64_t)'e' << 32) | \
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((uint64_t)'f' << 24) | ('i' << 16) | ('n' << 8) | \
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('e' << 0))
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#define END ((';' << 8) | ('\n' << 0))
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static int xbm_init(AVCodecParserContext *s)
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{
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XBMParseContext *bpc = s->priv_data;
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bpc->count = 1;
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return 0;
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}
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static int xbm_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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XBMParseContext *bpc = s->priv_data;
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uint64_t state = bpc->pc.state64;
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uint16_t state16 = bpc->state16;
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int next = END_NOT_FOUND, i = 0;
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s->pict_type = AV_PICTURE_TYPE_I;
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s->key_frame = 1;
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s->duration = 1;
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*poutbuf_size = 0;
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*poutbuf = NULL;
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for (; i < buf_size; i++) {
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state = (state << 8) | buf[i];
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state16 = (state16 << 8) | buf[i];
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if (state == KEY)
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bpc->count++;
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if ((state == KEY && bpc->count == 1)) {
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next = i - 6;
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break;
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} else if (state16 == END) {
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next = i + 1;
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bpc->count = 0;
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break;
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}
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}
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bpc->pc.state64 = state;
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bpc->state16 = state16;
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if (ff_combine_frame(&bpc->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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*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_xbm_parser = {
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.codec_ids = { AV_CODEC_ID_XBM },
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.priv_data_size = sizeof(XBMParseContext),
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.parser_init = xbm_init,
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.parser_parse = xbm_parse,
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.parser_close = ff_parse_close,
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};
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