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/* |
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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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✓✓✗✓
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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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✗✓ |
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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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✓✓ |
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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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✓✓ |
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for (x = 0; x < avctx->width; x += 4) { |
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✗✓✗✗
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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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✓✓ |
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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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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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}; |