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  1. /*
  2.  * Cirrus Logic AccuPak (CLJR) encoder
  3.  * Copyright (c) 2003 Alex Beregszaszi
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * Cirrus Logic AccuPak encoder.
  25.  */
  26.  
  27. #include "libavutil/common.h"
  28. #include "libavutil/opt.h"
  29.  
  30. #include "avcodec.h"
  31. #include "internal.h"
  32. #include "put_bits.h"
  33.  
  34. typedef struct CLJRContext {
  35.     AVClass        *avclass;
  36.     int             dither_type;
  37. } CLJRContext;
  38.  
  39. static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  40.                         const AVFrame *p, int *got_packet)
  41. {
  42.     CLJRContext *a = avctx->priv_data;
  43.     PutBitContext pb;
  44.     int x, y, ret;
  45.     uint32_t dither= avctx->frame_number;
  46.     static const uint32_t ordered_dither[2][2] =
  47.     {
  48.         { 0x10400000, 0x104F0000 },
  49.         { 0xCB2A0000, 0xCB250000 },
  50.     };
  51.  
  52.     if (avctx->width%4 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
  53.          av_log(avctx, AV_LOG_ERROR,
  54.                 "Widths which are not a multiple of 4 might fail with some decoders, "
  55.                 "use vstrict=-1 / -strict -1 to use %d anyway.\n", avctx->width);
  56.          return AVERROR_EXPERIMENTAL;
  57.     }
  58.  
  59.     if ((ret = ff_alloc_packet2(avctx, pkt, 32*avctx->height*avctx->width/4, 0)) < 0)
  60.         return ret;
  61.  
  62.     init_put_bits(&pb, pkt->data, pkt->size);
  63.  
  64.     for (y = 0; y < avctx->height; y++) {
  65.         uint8_t *luma = &p->data[0][y * p->linesize[0]];
  66.         uint8_t *cb   = &p->data[1][y * p->linesize[1]];
  67.         uint8_t *cr   = &p->data[2][y * p->linesize[2]];
  68.         uint8_t luma_tmp[4];
  69.         for (x = 0; x < avctx->width; x += 4) {
  70.             switch (a->dither_type) {
  71.             case 0: dither = 0x492A0000;                       break;
  72.             case 1: dither = dither * 1664525 + 1013904223;    break;
  73.             case 2: dither = ordered_dither[ y&1 ][ (x>>2)&1 ];break;
  74.             }
  75.             if (x+3 >= avctx->width) {
  76.                 memset(luma_tmp, 0, sizeof(luma_tmp));
  77.                 memcpy(luma_tmp, luma, avctx->width - x);
  78.                 luma = luma_tmp;
  79.             }
  80.             put_bits(&pb, 5, (249*(luma[3] +  (dither>>29)   )) >> 11);
  81.             put_bits(&pb, 5, (249*(luma[2] + ((dither>>26)&7))) >> 11);
  82.             put_bits(&pb, 5, (249*(luma[1] + ((dither>>23)&7))) >> 11);
  83.             put_bits(&pb, 5, (249*(luma[0] + ((dither>>20)&7))) >> 11);
  84.             luma += 4;
  85.             put_bits(&pb, 6, (253*(*(cb++) + ((dither>>18)&3))) >> 10);
  86.             put_bits(&pb, 6, (253*(*(cr++) + ((dither>>16)&3))) >> 10);
  87.         }
  88.     }
  89.  
  90.     flush_put_bits(&pb);
  91.  
  92.     pkt->size   = put_bits_count(&pb) / 8;
  93.     pkt->flags |= AV_PKT_FLAG_KEY;
  94.     *got_packet = 1;
  95.     return 0;
  96. }
  97.  
  98. #define OFFSET(x) offsetof(CLJRContext, x)
  99. #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
  100. static const AVOption options[] = {
  101.     { "dither_type",   "Dither type",   OFFSET(dither_type),        AV_OPT_TYPE_INT, { .i64=1 }, 0, 2, VE},
  102.     { NULL },
  103. };
  104.  
  105. static const AVClass cljr_class = {
  106.     .class_name = "cljr encoder",
  107.     .item_name  = av_default_item_name,
  108.     .option     = options,
  109.     .version    = LIBAVUTIL_VERSION_INT,
  110. };
  111.  
  112. AVCodec ff_cljr_encoder = {
  113.     .name           = "cljr",
  114.     .long_name      = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
  115.     .type           = AVMEDIA_TYPE_VIDEO,
  116.     .id             = AV_CODEC_ID_CLJR,
  117.     .priv_data_size = sizeof(CLJRContext),
  118.     .encode2        = encode_frame,
  119.     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,
  120.                                                    AV_PIX_FMT_NONE },
  121.     .priv_class     = &cljr_class,
  122. };
  123.