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122 lines
4.1 KiB
C
122 lines
4.1 KiB
C
/*
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* Cirrus Logic AccuPak (CLJR) encoder
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* Copyright (c) 2003 Alex Beregszaszi
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Cirrus Logic AccuPak encoder.
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*/
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#include "libavutil/opt.h"
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#include "avcodec.h"
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#include "encode.h"
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#include "put_bits.h"
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typedef struct CLJRContext {
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AVClass *avclass;
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int dither_type;
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} CLJRContext;
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static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *p, int *got_packet)
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{
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CLJRContext *a = avctx->priv_data;
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PutBitContext pb;
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int x, y, ret;
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uint32_t dither= avctx->frame_number;
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static const uint32_t ordered_dither[2][2] =
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{
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{ 0x10400000, 0x104F0000 },
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{ 0xCB2A0000, 0xCB250000 },
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};
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if (avctx->width%4 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
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av_log(avctx, AV_LOG_ERROR,
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"Widths which are not a multiple of 4 might fail with some decoders, "
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"use vstrict=-1 / -strict -1 to use %d anyway.\n", avctx->width);
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return AVERROR_EXPERIMENTAL;
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}
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ret = ff_get_encode_buffer(avctx, pkt, 4 * avctx->height * ((avctx->width + 3) / 4), 0);
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if (ret < 0)
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return ret;
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init_put_bits(&pb, pkt->data, pkt->size);
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for (y = 0; y < avctx->height; y++) {
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uint8_t *luma = &p->data[0][y * p->linesize[0]];
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uint8_t *cb = &p->data[1][y * p->linesize[1]];
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uint8_t *cr = &p->data[2][y * p->linesize[2]];
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uint8_t luma_tmp[4];
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for (x = 0; x < avctx->width; x += 4) {
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switch (a->dither_type) {
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case 0: dither = 0x492A0000; break;
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case 1: dither = dither * 1664525 + 1013904223; break;
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case 2: dither = ordered_dither[ y&1 ][ (x>>2)&1 ];break;
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}
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if (x+3 >= avctx->width) {
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memset(luma_tmp, 0, sizeof(luma_tmp));
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memcpy(luma_tmp, luma, avctx->width - x);
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luma = luma_tmp;
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}
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put_bits(&pb, 5, (249*(luma[3] + (dither>>29) )) >> 11);
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put_bits(&pb, 5, (249*(luma[2] + ((dither>>26)&7))) >> 11);
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put_bits(&pb, 5, (249*(luma[1] + ((dither>>23)&7))) >> 11);
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put_bits(&pb, 5, (249*(luma[0] + ((dither>>20)&7))) >> 11);
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luma += 4;
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put_bits(&pb, 6, (253*(*(cb++) + ((dither>>18)&3))) >> 10);
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put_bits(&pb, 6, (253*(*(cr++) + ((dither>>16)&3))) >> 10);
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}
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}
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flush_put_bits(&pb);
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*got_packet = 1;
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return 0;
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}
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#define OFFSET(x) offsetof(CLJRContext, x)
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#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "dither_type", "Dither type", OFFSET(dither_type), AV_OPT_TYPE_INT, { .i64=1 }, 0, 2, VE},
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{ NULL },
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};
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static const AVClass cljr_class = {
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.class_name = "cljr encoder",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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const AVCodec ff_cljr_encoder = {
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.name = "cljr",
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.long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_CLJR,
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.capabilities = AV_CODEC_CAP_DR1,
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.priv_data_size = sizeof(CLJRContext),
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.encode2 = encode_frame,
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.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_NONE },
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.priv_class = &cljr_class,
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};
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