| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Avid DNxUncomressed / SMPTE RDD 50 parser | ||
| 3 | * Copyright (c) 2024 Martin Schitter | ||
| 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 | * This parser for DNxUncompressed video data is mostly based on the public | ||
| 24 | * SMPTE RDD 50:2019 specification. | ||
| 25 | */ | ||
| 26 | |||
| 27 | #include "parser.h" | ||
| 28 | #include "libavutil/bswap.h" | ||
| 29 | |||
| 30 | typedef struct DNxUcParseContext { | ||
| 31 | ParseContext pc; | ||
| 32 | uint32_t remaining; | ||
| 33 | } DNxUcParseContext; | ||
| 34 | |||
| 35 | ✗ | static int dnxuc_parse(AVCodecParserContext *s, | |
| 36 | AVCodecContext *avctx, | ||
| 37 | const uint8_t **poutbuf, int *poutbuf_size, | ||
| 38 | const uint8_t *buf, int buf_size) | ||
| 39 | { | ||
| 40 | ✗ | DNxUcParseContext *ipc = s->priv_data; | |
| 41 | ✗ | int next = END_NOT_FOUND; | |
| 42 | |||
| 43 | ✗ | s->pict_type = AV_PICTURE_TYPE_NONE; | |
| 44 | |||
| 45 | ✗ | *poutbuf_size = 0; | |
| 46 | ✗ | *poutbuf = NULL; | |
| 47 | |||
| 48 | ✗ | if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { | |
| 49 | ✗ | next = buf_size; | |
| 50 | } else { | ||
| 51 | ✗ | if (ipc->remaining == 0) { | |
| 52 | ✗ | uint64_t state = ipc->pc.state64; | |
| 53 | ✗ | for (int i = 0; i < buf_size; i++) { | |
| 54 | ✗ | state = (state << 8) | buf[i]; | |
| 55 | ✗ | if (ipc->pc.index + i >= 7 && (uint32_t)state == MKBETAG('p','a','c','k')) { | |
| 56 | ✗ | uint32_t size = av_bswap32(state >> 32); | |
| 57 | ✗ | if (size >= 8) { | |
| 58 | ✗ | next = i - 7; | |
| 59 | ✗ | ipc->remaining = size + FFMIN(next, 0); | |
| 60 | ✗ | break; | |
| 61 | } | ||
| 62 | } | ||
| 63 | } | ||
| 64 | ✗ | ipc->pc.state64 = state; | |
| 65 | ✗ | } else if (ipc->remaining <= buf_size) { | |
| 66 | ✗ | next = ipc->remaining; | |
| 67 | ✗ | ipc->remaining = 0; | |
| 68 | } else { | ||
| 69 | ✗ | ipc->remaining -= buf_size; | |
| 70 | } | ||
| 71 | ✗ | if (ff_combine_frame(&ipc->pc, next, &buf, &buf_size) < 0) { | |
| 72 | ✗ | *poutbuf = NULL; | |
| 73 | ✗ | *poutbuf_size = 0; | |
| 74 | ✗ | return buf_size; | |
| 75 | } | ||
| 76 | } | ||
| 77 | |||
| 78 | ✗ | *poutbuf = buf; | |
| 79 | ✗ | *poutbuf_size = buf_size; | |
| 80 | |||
| 81 | ✗ | return next; | |
| 82 | } | ||
| 83 | |||
| 84 | const AVCodecParser ff_dnxuc_parser = { | ||
| 85 | .codec_ids = { AV_CODEC_ID_DNXUC }, | ||
| 86 | .priv_data_size = sizeof(DNxUcParseContext), | ||
| 87 | .parser_parse = dnxuc_parse, | ||
| 88 | }; | ||
| 89 |