| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Panasonic RW2 parser | ||
| 3 | * Copyright (c) 2026 Lynne <dev@lynne.ee> | ||
| 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 | * Delimits frames on the "IIU\0" magic and reads IFD0 to set the dimensions | ||
| 24 | * and pixel format without decoding. | ||
| 25 | */ | ||
| 26 | |||
| 27 | #include "libavutil/common.h" | ||
| 28 | #include "libavutil/intreadwrite.h" | ||
| 29 | |||
| 30 | #include "parser.h" | ||
| 31 | #include "parser_internal.h" | ||
| 32 | |||
| 33 | typedef struct RW2ParseContext { | ||
| 34 | ParseContext pc; | ||
| 35 | } RW2ParseContext; | ||
| 36 | |||
| 37 | ✗ | static void rw2_set_params(AVCodecParserContext *s, AVCodecContext *avctx, | |
| 38 | const uint8_t *buf, int buf_size) | ||
| 39 | { | ||
| 40 | static const enum AVPixelFormat cfa_fmts[] = { | ||
| 41 | AV_PIX_FMT_BAYER_RGGB16, AV_PIX_FMT_BAYER_GRBG16, | ||
| 42 | AV_PIX_FMT_BAYER_GBRG16, AV_PIX_FMT_BAYER_BGGR16, | ||
| 43 | }; | ||
| 44 | |||
| 45 | ✗ | if (buf_size < 8 || AV_RL32(buf) != MKTAG('I', 'I', 'U', 0)) | |
| 46 | ✗ | return; | |
| 47 | |||
| 48 | ✗ | int64_t ifd = AV_RL32(buf + 4); | |
| 49 | ✗ | if (ifd < 8 || ifd + 2 > buf_size) | |
| 50 | ✗ | return; | |
| 51 | |||
| 52 | ✗ | int width = 0, height = 0, cfa = 0, bpp = 0; | |
| 53 | ✗ | int n = FFMIN(AV_RL16(buf + ifd), (buf_size - ifd - 2) / 12); | |
| 54 | ✗ | for (int i = 0; i < n; i++) { | |
| 55 | ✗ | const uint8_t *e = buf + ifd + 2 + 12*i; | |
| 56 | ✗ | unsigned tag = AV_RL16(e), type = AV_RL16(e + 2), val = AV_RL32(e + 8); | |
| 57 | ✗ | unsigned v = type == 3 ? val & 0xFFFF : val; | |
| 58 | |||
| 59 | ✗ | switch (tag) { | |
| 60 | ✗ | case 0x02: width = v; break; | |
| 61 | ✗ | case 0x03: height = v; break; | |
| 62 | ✗ | case 0x09: cfa = v; break; | |
| 63 | ✗ | case 0x0A: bpp = v; break; | |
| 64 | } | ||
| 65 | } | ||
| 66 | |||
| 67 | ✗ | if (width > 0 && height > 0 && cfa >= 1 && cfa <= 4) { | |
| 68 | ✗ | s->width = width; | |
| 69 | ✗ | s->height = height; | |
| 70 | ✗ | s->format = cfa_fmts[cfa - 1]; | |
| 71 | ✗ | avctx->color_trc = AVCOL_TRC_LINEAR; | |
| 72 | ✗ | if (bpp >= 8 && bpp <= 16) | |
| 73 | ✗ | avctx->bits_per_raw_sample = bpp; | |
| 74 | } | ||
| 75 | } | ||
| 76 | |||
| 77 | ✗ | static int rw2_parse(AVCodecParserContext *s, AVCodecContext *avctx, | |
| 78 | const uint8_t **poutbuf, int *poutbuf_size, | ||
| 79 | const uint8_t *buf, int buf_size) | ||
| 80 | { | ||
| 81 | ✗ | RW2ParseContext *ipc = s->priv_data; | |
| 82 | ✗ | uint32_t state = ipc->pc.state; | |
| 83 | ✗ | int next = END_NOT_FOUND; | |
| 84 | |||
| 85 | ✗ | s->key_frame = 1; | |
| 86 | ✗ | s->pict_type = AV_PICTURE_TYPE_I; | |
| 87 | |||
| 88 | /* The header lands in the first chunk, so the parameters are known without | ||
| 89 | * waiting for, or decoding, the whole frame */ | ||
| 90 | ✗ | if (buf_size >= 8 && AV_RL32(buf) == MKTAG('I', 'I', 'U', 0)) | |
| 91 | ✗ | rw2_set_params(s, avctx, buf, buf_size); | |
| 92 | |||
| 93 | ✗ | if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { | |
| 94 | ✗ | next = buf_size; | |
| 95 | } else { | ||
| 96 | ✗ | for (int i = 0; i < buf_size; i++) { | |
| 97 | ✗ | state = (state << 8) | buf[i]; | |
| 98 | ✗ | if (state == MKBETAG('I', 'I', 'U', 0)) { | |
| 99 | /* The next frame's magic ends this one */ | ||
| 100 | ✗ | if (ipc->pc.frame_start_found) { | |
| 101 | ✗ | next = i - 3; | |
| 102 | ✗ | ipc->pc.frame_start_found = 0; | |
| 103 | ✗ | break; | |
| 104 | } | ||
| 105 | ✗ | ipc->pc.frame_start_found = 1; | |
| 106 | } | ||
| 107 | } | ||
| 108 | ✗ | ipc->pc.state = state; | |
| 109 | ✗ | if (ff_combine_frame(&ipc->pc, next, &buf, &buf_size) < 0) { | |
| 110 | ✗ | *poutbuf = NULL; | |
| 111 | ✗ | *poutbuf_size = 0; | |
| 112 | ✗ | return buf_size; | |
| 113 | } | ||
| 114 | } | ||
| 115 | |||
| 116 | ✗ | *poutbuf = buf; | |
| 117 | ✗ | *poutbuf_size = buf_size; | |
| 118 | ✗ | return next; | |
| 119 | } | ||
| 120 | |||
| 121 | const FFCodecParser ff_rw2_parser = { | ||
| 122 | PARSER_CODEC_LIST(AV_CODEC_ID_RW2), | ||
| 123 | .priv_data_size = sizeof(RW2ParseContext), | ||
| 124 | .parse = rw2_parse, | ||
| 125 | .close = ff_parse_close, | ||
| 126 | }; | ||
| 127 |