mirror of
https://github.com/librempeg/librempeg
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94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/*
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* RV30/40 parser
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* Copyright (c) 2011 Konstantin Shishkov
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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* RV30/40 parser
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*/
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#include "parser.h"
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#include "libavutil/intreadwrite.h"
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typedef struct {
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ParseContext pc;
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int64_t key_dts;
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int key_pts;
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} RV34ParseContext;
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static const int rv_to_av_frame_type[4] = {
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AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B,
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};
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static int rv34_parse(AVCodecParserContext *s,
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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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RV34ParseContext *pc = s->priv_data;
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int type, pts, hdr;
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if (buf_size < 13 + *buf * 8) {
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*poutbuf = buf;
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*poutbuf_size = buf_size;
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return buf_size;
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}
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hdr = AV_RB32(buf + 9 + *buf * 8);
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if (avctx->codec_id == AV_CODEC_ID_RV30) {
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type = (hdr >> 27) & 3;
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pts = (hdr >> 7) & 0x1FFF;
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} else {
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type = (hdr >> 29) & 3;
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pts = (hdr >> 6) & 0x1FFF;
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}
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if (type != 3 && s->pts != AV_NOPTS_VALUE) {
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pc->key_dts = s->pts;
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pc->key_pts = pts;
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} else {
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if (type != 3)
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s->pts = pc->key_dts + ((pts - pc->key_pts) & 0x1FFF);
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else
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s->pts = pc->key_dts - ((pc->key_pts - pts) & 0x1FFF);
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}
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s->pict_type = rv_to_av_frame_type[type];
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*poutbuf = buf;
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*poutbuf_size = buf_size;
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return buf_size;
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}
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#if CONFIG_RV30_PARSER
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AVCodecParser ff_rv30_parser = {
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.codec_ids = { AV_CODEC_ID_RV30 },
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.priv_data_size = sizeof(RV34ParseContext),
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.parser_parse = rv34_parse,
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};
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#endif
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#if CONFIG_RV40_PARSER
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AVCodecParser ff_rv40_parser = {
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.codec_ids = { AV_CODEC_ID_RV40 },
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.priv_data_size = sizeof(RV34ParseContext),
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.parser_parse = rv34_parse,
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};
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#endif
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