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1 | /* |
2 | * Cirrus Logic AccuPak (CLJR) decoder | |
3 | * Copyright (c) 2003 Alex Beregszaszi | |
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 | * Cirrus Logic AccuPak decoder. | |
25 | */ | |
26 | ||
27 | #include "avcodec.h" | |
28 | #include "get_bits.h" | |
29 | #include "internal.h" | |
30 | ||
31 | static int decode_frame(AVCodecContext *avctx, | |
32 | void *data, int *got_frame, | |
33 | AVPacket *avpkt) | |
34 | { | |
35 | const uint8_t *buf = avpkt->data; | |
36 | int buf_size = avpkt->size; | |
37 | GetBitContext gb; | |
38 | AVFrame * const p = data; | |
39 | int x, y, ret; | |
40 | ||
41 | if (avctx->height <= 0 || avctx->width <= 0) { | |
42 | av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n"); | |
43 | return AVERROR_INVALIDDATA; | |
44 | } | |
45 | ||
46 | if (buf_size / avctx->height < avctx->width) { | |
47 | av_log(avctx, AV_LOG_ERROR, | |
48 | "Resolution larger than buffer size. Invalid header?\n"); | |
49 | return AVERROR_INVALIDDATA; | |
50 | } | |
51 | ||
52 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) | |
53 | return ret; | |
54 | p->pict_type = AV_PICTURE_TYPE_I; | |
55 | p->key_frame = 1; | |
56 | ||
57 | init_get_bits(&gb, buf, buf_size * 8); | |
58 | ||
59 | for (y = 0; y < avctx->height; y++) { | |
60 | uint8_t *luma = &p->data[0][y * p->linesize[0]]; | |
61 | uint8_t *cb = &p->data[1][y * p->linesize[1]]; | |
62 | uint8_t *cr = &p->data[2][y * p->linesize[2]]; | |
63 | for (x = 0; x < avctx->width; x += 4) { | |
64 | luma[3] = (get_bits(&gb, 5)*33) >> 2; | |
65 | luma[2] = (get_bits(&gb, 5)*33) >> 2; | |
66 | luma[1] = (get_bits(&gb, 5)*33) >> 2; | |
67 | luma[0] = (get_bits(&gb, 5)*33) >> 2; | |
68 | luma += 4; | |
69 | *(cb++) = get_bits(&gb, 6) << 2; | |
70 | *(cr++) = get_bits(&gb, 6) << 2; | |
71 | } | |
72 | } | |
73 | ||
74 | *got_frame = 1; | |
75 | ||
76 | return buf_size; | |
77 | } | |
78 | ||
79 | static av_cold int decode_init(AVCodecContext *avctx) | |
80 | { | |
81 | avctx->pix_fmt = AV_PIX_FMT_YUV411P; | |
82 | return 0; | |
83 | } | |
84 | ||
85 | AVCodec ff_cljr_decoder = { | |
86 | .name = "cljr", | |
87 | .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"), | |
88 | .type = AVMEDIA_TYPE_VIDEO, | |
89 | .id = AV_CODEC_ID_CLJR, | |
90 | .init = decode_init, | |
91 | .decode = decode_frame, | |
92 | .capabilities = CODEC_CAP_DR1, | |
93 | }; | |
94 |