2 * Cirrus Logic AccuPak (CLJR) decoder
3 * Copyright (c) 2003 Alex Beregszaszi
5 * This file is part of FFmpeg.
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.
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.
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
24 * Cirrus Logic AccuPak decoder.
31 static int decode_frame(AVCodecContext
*avctx
,
32 void *data
, int *got_frame
,
35 const uint8_t *buf
= avpkt
->data
;
36 int buf_size
= avpkt
->size
;
38 AVFrame
* const p
= data
;
41 if (avctx
->height
<= 0 || avctx
->width
<= 0) {
42 av_log(avctx
, AV_LOG_ERROR
, "Invalid width or height\n");
43 return AVERROR_INVALIDDATA
;
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
;
52 if ((ret
= ff_get_buffer(avctx
, p
, 0)) < 0)
54 p
->pict_type
= AV_PICTURE_TYPE_I
;
57 init_get_bits(&gb
, buf
, buf_size
* 8);
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;
69 *(cb
++) = get_bits(&gb
, 6) << 2;
70 *(cr
++) = get_bits(&gb
, 6) << 2;
79 static av_cold
int decode_init(AVCodecContext
*avctx
)
81 avctx
->pix_fmt
= AV_PIX_FMT_YUV411P
;
85 AVCodec ff_cljr_decoder
= {
87 .long_name
= NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
88 .type
= AVMEDIA_TYPE_VIDEO
,
89 .id
= AV_CODEC_ID_CLJR
,
91 .decode
= decode_frame
,
92 .capabilities
= CODEC_CAP_DR1
,