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/* |
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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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✓✓ |
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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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✓✓ |
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if (state == KEY) |
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bpc->count++; |
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✓✓✗✓
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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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✓✓ |
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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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✓✓ |
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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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}; |