| Directory: | ../../../ffmpeg/ |
|---|---|
| File: | src/libavcodec/rv34_parser.c |
| Date: | 2022-01-27 16:04:32 |
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| Lines: | 22 | 22 | 100.0% |
| Branches: | 10 | 10 | 100.0% |
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| 1 | /* | ||
| 2 | * RV30/40 parser | ||
| 3 | * Copyright (c) 2011 Konstantin Shishkov | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | /** | ||
| 23 | * @file | ||
| 24 | * RV30/40 parser | ||
| 25 | */ | ||
| 26 | |||
| 27 | #include "parser.h" | ||
| 28 | #include "libavutil/intreadwrite.h" | ||
| 29 | |||
| 30 | typedef struct RV34ParseContext { | ||
| 31 | ParseContext pc; | ||
| 32 | int64_t key_dts; | ||
| 33 | int key_pts; | ||
| 34 | } RV34ParseContext; | ||
| 35 | |||
| 36 | static const int rv_to_av_frame_type[4] = { | ||
| 37 | AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, | ||
| 38 | }; | ||
| 39 | |||
| 40 | 550 | static int rv34_parse(AVCodecParserContext *s, | |
| 41 | AVCodecContext *avctx, | ||
| 42 | const uint8_t **poutbuf, int *poutbuf_size, | ||
| 43 | const uint8_t *buf, int buf_size) | ||
| 44 | { | ||
| 45 | 550 | RV34ParseContext *pc = s->priv_data; | |
| 46 | int type, pts, hdr; | ||
| 47 | |||
| 48 |
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550 | if (buf_size < 13 + *buf * 8) { |
| 49 | 3 | *poutbuf = buf; | |
| 50 | 3 | *poutbuf_size = buf_size; | |
| 51 | 3 | return buf_size; | |
| 52 | } | ||
| 53 | |||
| 54 | 547 | hdr = AV_RB32(buf + 9 + *buf * 8); | |
| 55 |
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547 | if (avctx->codec_id == AV_CODEC_ID_RV30) { |
| 56 | 244 | type = (hdr >> 27) & 3; | |
| 57 | 244 | pts = (hdr >> 7) & 0x1FFF; | |
| 58 | } else { | ||
| 59 | 303 | type = (hdr >> 29) & 3; | |
| 60 | 303 | pts = (hdr >> 6) & 0x1FFF; | |
| 61 | } | ||
| 62 | |||
| 63 |
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547 | if (type != 3 && s->pts != AV_NOPTS_VALUE) { |
| 64 | 158 | pc->key_dts = s->pts; | |
| 65 | 158 | pc->key_pts = pts; | |
| 66 | } else { | ||
| 67 |
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389 | if (type != 3) |
| 68 | 2 | s->pts = pc->key_dts + ((pts - pc->key_pts) & 0x1FFF); | |
| 69 | else | ||
| 70 | 387 | s->pts = pc->key_dts - ((pc->key_pts - pts) & 0x1FFF); | |
| 71 | } | ||
| 72 | 547 | s->pict_type = rv_to_av_frame_type[type]; | |
| 73 | |||
| 74 | 547 | *poutbuf = buf; | |
| 75 | 547 | *poutbuf_size = buf_size; | |
| 76 | 547 | return buf_size; | |
| 77 | } | ||
| 78 | |||
| 79 | #if CONFIG_RV30_PARSER | ||
| 80 | const AVCodecParser ff_rv30_parser = { | ||
| 81 | .codec_ids = { AV_CODEC_ID_RV30 }, | ||
| 82 | .priv_data_size = sizeof(RV34ParseContext), | ||
| 83 | .parser_parse = rv34_parse, | ||
| 84 | }; | ||
| 85 | #endif | ||
| 86 | |||
| 87 | #if CONFIG_RV40_PARSER | ||
| 88 | const AVCodecParser ff_rv40_parser = { | ||
| 89 | .codec_ids = { AV_CODEC_ID_RV40 }, | ||
| 90 | .priv_data_size = sizeof(RV34ParseContext), | ||
| 91 | .parser_parse = rv34_parse, | ||
| 92 | }; | ||
| 93 | #endif | ||
| 94 |