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/*
* Cirrus Logic AccuPak (CLJR) encoder
* Copyright (c) 2003 Alex Beregszaszi
*
* This file is part of FFmpeg.
*
* 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.
*
* 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Cirrus Logic AccuPak encoder.
*/
#include "libavutil/opt.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "encode.h"
#include "put_bits.h"
typedef struct CLJRContext {
AVClass *avclass;
int dither_type;
} CLJRContext;
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *p, int *got_packet)
{
CLJRContext *a = avctx->priv_data;
PutBitContext pb;
int x, y, ret;
uint32_t dither= avctx->frame_number;
static const uint32_t ordered_dither[2][2] =
{
{ 0x10400000, 0x104F0000 },
{ 0xCB2A0000, 0xCB250000 },
};
if (avctx->width%4 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
av_log(avctx, AV_LOG_ERROR,
"Widths which are not a multiple of 4 might fail with some decoders, "
"use vstrict=-1 / -strict -1 to use %d anyway.\n", avctx->width);
return AVERROR_EXPERIMENTAL;
}
ret = ff_get_encode_buffer(avctx, pkt, 4 * avctx->height * ((avctx->width + 3) / 4), 0);
if (ret < 0)
return ret;
init_put_bits(&pb, pkt->data, pkt->size);
for (y = 0; y < avctx->height; y++) {
const uint8_t *luma = &p->data[0][y * p->linesize[0]];
const uint8_t *cb = &p->data[1][y * p->linesize[1]];
const uint8_t *cr = &p->data[2][y * p->linesize[2]];
uint8_t luma_tmp[4];
for (x = 0; x < avctx->width; x += 4) {
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;
}
if (x+3 >= avctx->width) {
memset(luma_tmp, 0, sizeof(luma_tmp));
memcpy(luma_tmp, luma, avctx->width - x);
luma = luma_tmp;
}
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, (253*(*(cb++) + ((dither>>18)&3))) >> 10);
put_bits(&pb, 6, (253*(*(cr++) + ((dither>>16)&3))) >> 10);
}
}
flush_put_bits(&pb);
*got_packet = 1;
return 0;
}
#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, { .i64=1 }, 0, 2, VE},
{ NULL },
};
static const AVClass cljr_class = {
.class_name = "cljr encoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFCodec ff_cljr_encoder = {
.p.name = "cljr",
CODEC_LONG_NAME("Cirrus Logic AccuPak"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_CLJR,
.p.capabilities = AV_CODEC_CAP_DR1,
.priv_data_size = sizeof(CLJRContext),
FF_CODEC_ENCODE_CB(encode_frame),
.p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,
AV_PIX_FMT_NONE },
.p.priv_class = &cljr_class,
};
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