2 * Cirrus Logic AccuPak (CLJR) codec
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 codec.
28 #include "libavutil/opt.h"
32 typedef struct CLJRContext {
38 static av_cold int common_init(AVCodecContext *avctx)
40 CLJRContext * const a = avctx->priv_data;
42 avcodec_get_frame_defaults(&a->picture);
43 avctx->coded_frame = &a->picture;
48 #if CONFIG_CLJR_DECODER
49 static int decode_frame(AVCodecContext *avctx,
50 void *data, int *data_size,
53 const uint8_t *buf = avpkt->data;
54 int buf_size = avpkt->size;
55 CLJRContext * const a = avctx->priv_data;
57 AVFrame *picture = data;
58 AVFrame * const p = &a->picture;
62 avctx->release_buffer(avctx, p);
64 if (avctx->height <= 0 || avctx->width <= 0) {
65 av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n");
66 return AVERROR_INVALIDDATA;
69 if (buf_size / avctx->height < avctx->width) {
70 av_log(avctx, AV_LOG_ERROR,
71 "Resolution larger than buffer size. Invalid header?\n");
72 return AVERROR_INVALIDDATA;
76 if (avctx->get_buffer(avctx, p) < 0) {
77 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
80 p->pict_type = AV_PICTURE_TYPE_I;
83 init_get_bits(&gb, buf, buf_size * 8);
85 for (y = 0; y < avctx->height; y++) {
86 uint8_t *luma = &a->picture.data[0][y * a->picture.linesize[0]];
87 uint8_t *cb = &a->picture.data[1][y * a->picture.linesize[1]];
88 uint8_t *cr = &a->picture.data[2][y * a->picture.linesize[2]];
89 for (x = 0; x < avctx->width; x += 4) {
90 luma[3] = get_bits(&gb, 5) << 3;
91 luma[2] = get_bits(&gb, 5) << 3;
92 luma[1] = get_bits(&gb, 5) << 3;
93 luma[0] = get_bits(&gb, 5) << 3;
95 *(cb++) = get_bits(&gb, 6) << 2;
96 *(cr++) = get_bits(&gb, 6) << 2;
100 *picture = a->picture;
101 *data_size = sizeof(AVPicture);
106 static av_cold int decode_init(AVCodecContext *avctx)
108 avctx->pix_fmt = PIX_FMT_YUV411P;
109 return common_init(avctx);
112 static av_cold int decode_end(AVCodecContext *avctx)
114 CLJRContext *a = avctx->priv_data;
116 if (a->picture.data[0])
117 avctx->release_buffer(avctx, &a->picture);
121 AVCodec ff_cljr_decoder = {
123 .type = AVMEDIA_TYPE_VIDEO,
125 .priv_data_size = sizeof(CLJRContext),
128 .decode = decode_frame,
129 .capabilities = CODEC_CAP_DR1,
130 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
134 #if CONFIG_CLJR_ENCODER
135 static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
136 int buf_size, void *data)
138 CLJRContext *a = avctx->priv_data;
142 uint32_t dither= avctx->frame_number;
143 static const uint32_t ordered_dither[2][2] =
145 { 0x10400000, 0x104F0000 },
146 { 0xCB2A0000, 0xCB250000 },
149 p->pict_type = AV_PICTURE_TYPE_I;
152 init_put_bits(&pb, buf, buf_size / 8);
154 for (y = 0; y < avctx->height; y++) {
155 uint8_t *luma = &p->data[0][y * p->linesize[0]];
156 uint8_t *cb = &p->data[1][y * p->linesize[1]];
157 uint8_t *cr = &p->data[2][y * p->linesize[2]];
158 for (x = 0; x < avctx->width; x += 4) {
159 switch (a->dither_type) {
160 case 0: dither = 0x492A0000; break;
161 case 1: dither = dither * 1664525 + 1013904223; break;
162 case 2: dither = ordered_dither[ y&1 ][ (x>>2)&1 ];break;
164 put_bits(&pb, 5, (luma[3] + (dither>>29) ) >> 3);
165 put_bits(&pb, 5, (luma[2] + ((dither>>26)&7)) >> 3);
166 put_bits(&pb, 5, (luma[1] + ((dither>>23)&7)) >> 3);
167 put_bits(&pb, 5, (luma[0] + ((dither>>20)&7)) >> 3);
169 put_bits(&pb, 6, (*(cb++) + ((dither>>18)&3)) >> 2);
170 put_bits(&pb, 6, (*(cr++) + ((dither>>16)&3)) >> 2);
176 return put_bits_count(&pb) / 8;
179 #define OFFSET(x) offsetof(CLJRContext, x)
180 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
181 static const AVOption options[] = {
182 { "dither_type", "Dither type", OFFSET(dither_type), AV_OPT_TYPE_INT, { .dbl=1 }, 0, 2, VE},
186 static const AVClass class = {
187 .class_name = "cljr encoder",
188 .item_name = av_default_item_name,
190 .version = LIBAVUTIL_VERSION_INT,
193 AVCodec ff_cljr_encoder = {
195 .type = AVMEDIA_TYPE_VIDEO,
197 .priv_data_size = sizeof(CLJRContext),
199 .encode = encode_frame,
200 .pix_fmts = (const enum PixelFormat[]) { PIX_FMT_YUV411P,
202 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
203 .priv_class = &class,