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 "codec_internal.h"
29 #include "get_bits.h"
30 #include "internal.h"
31
decode_frame(AVCodecContext * avctx,AVFrame * p,int * got_frame,AVPacket * avpkt)32 static int decode_frame(AVCodecContext *avctx, AVFrame *p,
33 int *got_frame, AVPacket *avpkt)
34 {
35 const uint8_t *buf = avpkt->data;
36 int buf_size = avpkt->size;
37 GetBitContext gb;
38 int x, y, ret;
39
40 if (avctx->height <= 0 || avctx->width <= 0) {
41 av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n");
42 return AVERROR_INVALIDDATA;
43 }
44
45 if (buf_size / avctx->height < avctx->width) {
46 av_log(avctx, AV_LOG_ERROR,
47 "Resolution larger than buffer size. Invalid header?\n");
48 return AVERROR_INVALIDDATA;
49 }
50
51 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
52 return ret;
53 p->pict_type = AV_PICTURE_TYPE_I;
54 p->key_frame = 1;
55
56 init_get_bits(&gb, buf, buf_size * 8);
57
58 for (y = 0; y < avctx->height; y++) {
59 uint8_t *luma = &p->data[0][y * p->linesize[0]];
60 uint8_t *cb = &p->data[1][y * p->linesize[1]];
61 uint8_t *cr = &p->data[2][y * p->linesize[2]];
62 for (x = 0; x < avctx->width; x += 4) {
63 luma[3] = (get_bits(&gb, 5)*33) >> 2;
64 luma[2] = (get_bits(&gb, 5)*33) >> 2;
65 luma[1] = (get_bits(&gb, 5)*33) >> 2;
66 luma[0] = (get_bits(&gb, 5)*33) >> 2;
67 luma += 4;
68 *(cb++) = get_bits(&gb, 6) << 2;
69 *(cr++) = get_bits(&gb, 6) << 2;
70 }
71 }
72
73 *got_frame = 1;
74
75 return buf_size;
76 }
77
decode_init(AVCodecContext * avctx)78 static av_cold int decode_init(AVCodecContext *avctx)
79 {
80 avctx->pix_fmt = AV_PIX_FMT_YUV411P;
81 return 0;
82 }
83
84 const FFCodec ff_cljr_decoder = {
85 .p.name = "cljr",
86 .p.long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
87 .p.type = AVMEDIA_TYPE_VIDEO,
88 .p.id = AV_CODEC_ID_CLJR,
89 .init = decode_init,
90 FF_CODEC_DECODE_CB(decode_frame),
91 .p.capabilities = AV_CODEC_CAP_DR1,
92 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
93 };
94
95