| /* |
| * RV30/40 parser |
| * Copyright (c) 2011 Konstantin Shishkov |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * RV30/40 parser |
| */ |
| |
| #include "parser.h" |
| #include "libavutil/intreadwrite.h" |
| |
| typedef struct RV34ParseContext { |
| ParseContext pc; |
| int64_t key_dts; |
| int key_pts; |
| } RV34ParseContext; |
| |
| static const int rv_to_av_frame_type[4] = { |
| AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, |
| }; |
| |
| static int rv34_parse(AVCodecParserContext *s, |
| AVCodecContext *avctx, |
| const uint8_t **poutbuf, int *poutbuf_size, |
| const uint8_t *buf, int buf_size) |
| { |
| RV34ParseContext *pc = s->priv_data; |
| int type, pts, hdr; |
| |
| if (buf_size < 13 + *buf * 8) { |
| *poutbuf = buf; |
| *poutbuf_size = buf_size; |
| return buf_size; |
| } |
| |
| hdr = AV_RB32(buf + 9 + *buf * 8); |
| if (avctx->codec_id == AV_CODEC_ID_RV30) { |
| type = (hdr >> 27) & 3; |
| pts = (hdr >> 7) & 0x1FFF; |
| } else { |
| type = (hdr >> 29) & 3; |
| pts = (hdr >> 6) & 0x1FFF; |
| } |
| |
| if (type != 3 && s->pts != AV_NOPTS_VALUE) { |
| pc->key_dts = s->pts; |
| pc->key_pts = pts; |
| } else { |
| if (type != 3) |
| s->pts = pc->key_dts + ((pts - pc->key_pts) & 0x1FFF); |
| else |
| s->pts = pc->key_dts - ((pc->key_pts - pts) & 0x1FFF); |
| } |
| s->pict_type = rv_to_av_frame_type[type]; |
| |
| *poutbuf = buf; |
| *poutbuf_size = buf_size; |
| return buf_size; |
| } |
| |
| #if CONFIG_RV30_PARSER |
| AVCodecParser ff_rv30_parser = { |
| .codec_ids = { AV_CODEC_ID_RV30 }, |
| .priv_data_size = sizeof(RV34ParseContext), |
| .parser_parse = rv34_parse, |
| }; |
| #endif |
| |
| #if CONFIG_RV40_PARSER |
| AVCodecParser ff_rv40_parser = { |
| .codec_ids = { AV_CODEC_ID_RV40 }, |
| .priv_data_size = sizeof(RV34ParseContext), |
| .parser_parse = rv34_parse, |
| }; |
| #endif |