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/* |
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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 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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* 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 RV34ParseContext { |
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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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✓✓ |
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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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✓✓ |
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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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✓✓✓✓
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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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✓✓ |
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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 |