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
31static 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
79static av_cold int decode_init(AVCodecContext *avctx)
80{
81    avctx->pix_fmt = AV_PIX_FMT_YUV411P;
82    return 0;
83}
84
85AVCodec 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
95