yading@10: /*
yading@10:  * RV30/40 parser
yading@10:  * Copyright (c) 2011 Konstantin Shishkov
yading@10:  *
yading@10:  * This file is part of Libav.
yading@10:  *
yading@10:  * Libav is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * Libav is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with Libav; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * RV30/40 parser
yading@10:  */
yading@10: 
yading@10: #include "parser.h"
yading@10: #include "libavutil/intreadwrite.h"
yading@10: 
yading@10: typedef struct {
yading@10:     ParseContext pc;
yading@10:     int64_t key_dts;
yading@10:     int key_pts;
yading@10: } RV34ParseContext;
yading@10: 
yading@10: static const int rv_to_av_frame_type[4] = {
yading@10:     AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B,
yading@10: };
yading@10: 
yading@10: static int rv34_parse(AVCodecParserContext *s,
yading@10:                       AVCodecContext *avctx,
yading@10:                       const uint8_t **poutbuf, int *poutbuf_size,
yading@10:                       const uint8_t *buf, int buf_size)
yading@10: {
yading@10:     RV34ParseContext *pc = s->priv_data;
yading@10:     int type, pts, hdr;
yading@10: 
yading@10:     if (buf_size < 13 + *buf * 8) {
yading@10:         *poutbuf = buf;
yading@10:         *poutbuf_size = buf_size;
yading@10:         return buf_size;
yading@10:     }
yading@10: 
yading@10:     hdr = AV_RB32(buf + 9 + *buf * 8);
yading@10:     if (avctx->codec_id == AV_CODEC_ID_RV30) {
yading@10:         type = (hdr >> 27) & 3;
yading@10:         pts  = (hdr >>  7) & 0x1FFF;
yading@10:     } else {
yading@10:         type = (hdr >> 29) & 3;
yading@10:         pts  = (hdr >>  6) & 0x1FFF;
yading@10:     }
yading@10: 
yading@10:     if (type != 3 && s->pts != AV_NOPTS_VALUE) {
yading@10:         pc->key_dts = s->pts;
yading@10:         pc->key_pts = pts;
yading@10:     } else {
yading@10:         if (type != 3)
yading@10:             s->pts = pc->key_dts + ((pts - pc->key_pts) & 0x1FFF);
yading@10:         else
yading@10:             s->pts = pc->key_dts - ((pc->key_pts - pts) & 0x1FFF);
yading@10:     }
yading@10:     s->pict_type = rv_to_av_frame_type[type];
yading@10: 
yading@10:     *poutbuf = buf;
yading@10:     *poutbuf_size = buf_size;
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: #if CONFIG_RV30_PARSER
yading@10: AVCodecParser ff_rv30_parser = {
yading@10:     .codec_ids      = { AV_CODEC_ID_RV30 },
yading@10:     .priv_data_size = sizeof(RV34ParseContext),
yading@10:     .parser_parse   = rv34_parse,
yading@10: };
yading@10: #endif
yading@10: 
yading@10: #if CONFIG_RV40_PARSER
yading@10: AVCodecParser ff_rv40_parser = {
yading@10:     .codec_ids      = { AV_CODEC_ID_RV40 },
yading@10:     .priv_data_size = sizeof(RV34ParseContext),
yading@10:     .parser_parse   = rv34_parse,
yading@10: };
yading@10: #endif