blob: 4b187f8cf3b7c3c30ef672c539d3f499fb4a115c
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 = AV_CODEC_CAP_DR1, |
93 | }; |
94 | |
95 |