a247ac640d
Given that the AVCodec.next pointer has now been removed, most of the AVCodecs are not modified at all any more and can therefore be made const (as this patch does); the only exceptions are the very few codecs for external libraries that have a init_static_data callback. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
123 lines
4.2 KiB
C
123 lines
4.2 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/common.h"
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#include "libavutil/opt.h"
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#include "avcodec.h"
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#include "internal.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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if ((ret = ff_alloc_packet2(avctx, pkt, 32*avctx->height*avctx->width/4, 0)) < 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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pkt->size = put_bytes_output(&pb);
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pkt->flags |= AV_PKT_FLAG_KEY;
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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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.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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