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"
33 typedef struct CLJRContext {
39 static av_cold int common_init(AVCodecContext *avctx)
41 CLJRContext * const a = avctx->priv_data;
43 avcodec_get_frame_defaults(&a->picture);
44 avctx->coded_frame = &a->picture;
49 #if CONFIG_CLJR_DECODER
50 static int decode_frame(AVCodecContext *avctx,
51 void *data, int *data_size,
54 const uint8_t *buf = avpkt->data;
55 int buf_size = avpkt->size;
56 CLJRContext * const a = avctx->priv_data;
58 AVFrame *picture = data;
59 AVFrame * const p = &a->picture;
63 avctx->release_buffer(avctx, p);
65 if (avctx->height <= 0 || avctx->width <= 0) {
66 av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n");
67 return AVERROR_INVALIDDATA;
70 if (buf_size / avctx->height < avctx->width) {
71 av_log(avctx, AV_LOG_ERROR,
72 "Resolution larger than buffer size. Invalid header?\n");
73 return AVERROR_INVALIDDATA;
77 if (avctx->get_buffer(avctx, p) < 0) {
78 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
81 p->pict_type = AV_PICTURE_TYPE_I;
84 init_get_bits(&gb, buf, buf_size * 8);
86 for (y = 0; y < avctx->height; y++) {
87 uint8_t *luma = &a->picture.data[0][y * a->picture.linesize[0]];
88 uint8_t *cb = &a->picture.data[1][y * a->picture.linesize[1]];
89 uint8_t *cr = &a->picture.data[2][y * a->picture.linesize[2]];
90 for (x = 0; x < avctx->width; x += 4) {
91 luma[3] = (get_bits(&gb, 5)*33) >> 2;
92 luma[2] = (get_bits(&gb, 5)*33) >> 2;
93 luma[1] = (get_bits(&gb, 5)*33) >> 2;
94 luma[0] = (get_bits(&gb, 5)*33) >> 2;
96 *(cb++) = get_bits(&gb, 6) << 2;
97 *(cr++) = get_bits(&gb, 6) << 2;
101 *picture = a->picture;
102 *data_size = sizeof(AVPicture);
107 static av_cold int decode_init(AVCodecContext *avctx)
109 avctx->pix_fmt = AV_PIX_FMT_YUV411P;
110 return common_init(avctx);
113 static av_cold int decode_end(AVCodecContext *avctx)
115 CLJRContext *a = avctx->priv_data;
117 if (a->picture.data[0])
118 avctx->release_buffer(avctx, &a->picture);
122 AVCodec ff_cljr_decoder = {
124 .type = AVMEDIA_TYPE_VIDEO,
125 .id = AV_CODEC_ID_CLJR,
126 .priv_data_size = sizeof(CLJRContext),
129 .decode = decode_frame,
130 .capabilities = CODEC_CAP_DR1,
131 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
135 #if CONFIG_CLJR_ENCODER
136 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
137 const AVFrame *p, int *got_packet)
139 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 if ((ret = ff_alloc_packet2(avctx, pkt, 32*avctx->height*avctx->width/4)) < 0)
152 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
153 avctx->coded_frame->key_frame = 1;
155 init_put_bits(&pb, pkt->data, pkt->size);
157 for (y = 0; y < avctx->height; y++) {
158 uint8_t *luma = &p->data[0][y * p->linesize[0]];
159 uint8_t *cb = &p->data[1][y * p->linesize[1]];
160 uint8_t *cr = &p->data[2][y * p->linesize[2]];
161 for (x = 0; x < avctx->width; x += 4) {
162 switch (a->dither_type) {
163 case 0: dither = 0x492A0000; break;
164 case 1: dither = dither * 1664525 + 1013904223; break;
165 case 2: dither = ordered_dither[ y&1 ][ (x>>2)&1 ];break;
167 put_bits(&pb, 5, (249*(luma[3] + (dither>>29) )) >> 11);
168 put_bits(&pb, 5, (249*(luma[2] + ((dither>>26)&7))) >> 11);
169 put_bits(&pb, 5, (249*(luma[1] + ((dither>>23)&7))) >> 11);
170 put_bits(&pb, 5, (249*(luma[0] + ((dither>>20)&7))) >> 11);
172 put_bits(&pb, 6, (253*(*(cb++) + ((dither>>18)&3))) >> 10);
173 put_bits(&pb, 6, (253*(*(cr++) + ((dither>>16)&3))) >> 10);
179 pkt->size = put_bits_count(&pb) / 8;
180 pkt->flags |= AV_PKT_FLAG_KEY;
185 #define OFFSET(x) offsetof(CLJRContext, x)
186 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
187 static const AVOption options[] = {
188 { "dither_type", "Dither type", OFFSET(dither_type), AV_OPT_TYPE_INT, { .i64=1 }, 0, 2, VE},
192 static const AVClass class = {
193 .class_name = "cljr encoder",
194 .item_name = av_default_item_name,
196 .version = LIBAVUTIL_VERSION_INT,
199 AVCodec ff_cljr_encoder = {
201 .type = AVMEDIA_TYPE_VIDEO,
202 .id = AV_CODEC_ID_CLJR,
203 .priv_data_size = sizeof(CLJRContext),
205 .encode2 = encode_frame,
206 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,
208 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
209 .priv_class = &class,