2 * Cirrus Logic AccuPak (CLJR) decoder
3 * Copyright (c) 2003 Alex Beregszaszi
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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) {
53 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
56 p->pict_type = AV_PICTURE_TYPE_I;
59 init_get_bits(&gb, buf, buf_size * 8);
61 for (y = 0; y < avctx->height; y++) {
62 uint8_t *luma = &p->data[0][y * p->linesize[0]];
63 uint8_t *cb = &p->data[1][y * p->linesize[1]];
64 uint8_t *cr = &p->data[2][y * p->linesize[2]];
65 for (x = 0; x < avctx->width; x += 4) {
66 luma[3] = get_bits(&gb, 5) << 3;
67 luma[2] = get_bits(&gb, 5) << 3;
68 luma[1] = get_bits(&gb, 5) << 3;
69 luma[0] = get_bits(&gb, 5) << 3;
71 *(cb++) = get_bits(&gb, 6) << 2;
72 *(cr++) = get_bits(&gb, 6) << 2;
81 static av_cold int decode_init(AVCodecContext *avctx)
83 avctx->pix_fmt = AV_PIX_FMT_YUV411P;
87 AVCodec ff_cljr_decoder = {
89 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
90 .type = AVMEDIA_TYPE_VIDEO,
91 .id = AV_CODEC_ID_CLJR,
93 .decode = decode_frame,
94 .capabilities = CODEC_CAP_DR1,