* Cirrus Logic AccuPak (CLJR) codec
* Copyright (c) 2003 Alex Beregszaszi
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
*/
#include "avcodec.h"
+#include "libavutil/opt.h"
#include "get_bits.h"
#include "put_bits.h"
-typedef struct CLJRContext{
- AVCodecContext *avctx;
- AVFrame picture;
+typedef struct CLJRContext {
+ AVClass *avclass;
+ AVFrame picture;
+ int dither_type;
} CLJRContext;
static av_cold int common_init(AVCodecContext *avctx)
{
CLJRContext * const a = avctx->priv_data;
- avctx->coded_frame = (AVFrame*)&a->picture;
- a->avctx = avctx;
+ avcodec_get_frame_defaults(&a->picture);
+ avctx->coded_frame = &a->picture;
return 0;
}
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
+ int buf_size = avpkt->size;
CLJRContext * const a = avctx->priv_data;
GetBitContext gb;
AVFrame *picture = data;
- AVFrame * const p= (AVFrame*)&a->picture;
+ AVFrame * const p = &a->picture;
int x, y;
- if(p->data[0])
+ if (p->data[0])
avctx->release_buffer(avctx, p);
- if(buf_size/avctx->height < avctx->width) {
- av_log(avctx, AV_LOG_ERROR, "Resolution larger than buffer size. Invalid header?\n");
- return -1;
+ if (avctx->height <= 0 || avctx->width <= 0) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (buf_size / avctx->height < avctx->width) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Resolution larger than buffer size. Invalid header?\n");
+ return AVERROR_INVALIDDATA;
}
- p->reference= 0;
- if(avctx->get_buffer(avctx, p) < 0){
+ p->reference = 0;
+ if (avctx->get_buffer(avctx, p) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
- p->pict_type= AV_PICTURE_TYPE_I;
- p->key_frame= 1;
+ p->pict_type = AV_PICTURE_TYPE_I;
+ p->key_frame = 1;
init_get_bits(&gb, buf, buf_size * 8);
- for(y=0; y<avctx->height; y++){
- uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
- uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
- uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
- for(x=0; x<avctx->width; x+=4){
- luma[3] = get_bits(&gb, 5) << 3;
- luma[2] = get_bits(&gb, 5) << 3;
- luma[1] = get_bits(&gb, 5) << 3;
- luma[0] = get_bits(&gb, 5) << 3;
- luma+= 4;
+ for (y = 0; y < avctx->height; y++) {
+ uint8_t *luma = &a->picture.data[0][y * a->picture.linesize[0]];
+ uint8_t *cb = &a->picture.data[1][y * a->picture.linesize[1]];
+ uint8_t *cr = &a->picture.data[2][y * a->picture.linesize[2]];
+ for (x = 0; x < avctx->width; x += 4) {
+ luma[3] = (get_bits(&gb, 5)*33) >> 2;
+ luma[2] = (get_bits(&gb, 5)*33) >> 2;
+ luma[1] = (get_bits(&gb, 5)*33) >> 2;
+ luma[0] = (get_bits(&gb, 5)*33) >> 2;
+ luma += 4;
*(cb++) = get_bits(&gb, 6) << 2;
*(cr++) = get_bits(&gb, 6) << 2;
}
}
- *picture= *(AVFrame*)&a->picture;
+ *picture = a->picture;
*data_size = sizeof(AVPicture);
- emms_c();
-
return buf_size;
}
#endif
#if CONFIG_CLJR_ENCODER
-static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
+static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
+ int buf_size, void *data)
+{
+ CLJRContext *a = avctx->priv_data;
PutBitContext pb;
AVFrame *p = data;
int x, y;
+ uint32_t dither= avctx->frame_number;
+ static const uint32_t ordered_dither[2][2] =
+ {
+ { 0x10400000, 0x104F0000 },
+ { 0xCB2A0000, 0xCB250000 },
+ };
- p->pict_type= AV_PICTURE_TYPE_I;
- p->key_frame= 1;
+ p->pict_type = AV_PICTURE_TYPE_I;
+ p->key_frame = 1;
init_put_bits(&pb, buf, buf_size / 8);
uint8_t *cb = &p->data[1][y * p->linesize[1]];
uint8_t *cr = &p->data[2][y * p->linesize[2]];
for (x = 0; x < avctx->width; x += 4) {
- put_bits(&pb, 5, luma[3] >> 3);
- put_bits(&pb, 5, luma[2] >> 3);
- put_bits(&pb, 5, luma[1] >> 3);
- put_bits(&pb, 5, luma[0] >> 3);
+ switch (a->dither_type) {
+ case 0: dither = 0x492A0000; break;
+ case 1: dither = dither * 1664525 + 1013904223; break;
+ case 2: dither = ordered_dither[ y&1 ][ (x>>2)&1 ];break;
+ }
+ put_bits(&pb, 5, (249*(luma[3] + (dither>>29) )) >> 11);
+ put_bits(&pb, 5, (249*(luma[2] + ((dither>>26)&7))) >> 11);
+ put_bits(&pb, 5, (249*(luma[1] + ((dither>>23)&7))) >> 11);
+ put_bits(&pb, 5, (249*(luma[0] + ((dither>>20)&7))) >> 11);
luma += 4;
- put_bits(&pb, 6, *(cb++) >> 2);
- put_bits(&pb, 6, *(cr++) >> 2);
+ put_bits(&pb, 6, (253*(*(cb++) + ((dither>>18)&3))) >> 10);
+ put_bits(&pb, 6, (253*(*(cr++) + ((dither>>16)&3))) >> 10);
}
}
flush_put_bits(&pb);
- emms_c();
-
return put_bits_count(&pb) / 8;
}
+#define OFFSET(x) offsetof(CLJRContext, x)
+#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
+static const AVOption options[] = {
+ { "dither_type", "Dither type", OFFSET(dither_type), AV_OPT_TYPE_INT, { .dbl=1 }, 0, 2, VE},
+ { NULL },
+};
+
+static const AVClass class = {
+ .class_name = "cljr encoder",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
AVCodec ff_cljr_encoder = {
.name = "cljr",
.type = AVMEDIA_TYPE_VIDEO,
.pix_fmts = (const enum PixelFormat[]) { PIX_FMT_YUV411P,
PIX_FMT_NONE },
.long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
+ .priv_class = &class,
};
#endif
projects / ffmpeg / blobdiff