yading@10: /*
yading@10:  * Cirrus Logic AccuPak (CLJR) codec
yading@10:  * Copyright (c) 2003 Alex Beregszaszi
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Cirrus Logic AccuPak codec.
yading@10:  */
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "get_bits.h"
yading@10: #include "internal.h"
yading@10: #include "put_bits.h"
yading@10: 
yading@10: #if CONFIG_CLJR_DECODER
yading@10: static int decode_frame(AVCodecContext *avctx,
yading@10:                         void *data, int *got_frame,
yading@10:                         AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size       = avpkt->size;
yading@10:     GetBitContext gb;
yading@10:     AVFrame * const p = data;
yading@10:     int x, y, ret;
yading@10: 
yading@10:     if (avctx->height <= 0 || avctx->width <= 0) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (buf_size / avctx->height < avctx->width) {
yading@10:         av_log(avctx, AV_LOG_ERROR,
yading@10:                "Resolution larger than buffer size. Invalid header?\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
yading@10:         return ret;
yading@10:     p->pict_type = AV_PICTURE_TYPE_I;
yading@10:     p->key_frame = 1;
yading@10: 
yading@10:     init_get_bits(&gb, buf, buf_size * 8);
yading@10: 
yading@10:     for (y = 0; y < avctx->height; y++) {
yading@10:         uint8_t *luma = &p->data[0][y * p->linesize[0]];
yading@10:         uint8_t *cb   = &p->data[1][y * p->linesize[1]];
yading@10:         uint8_t *cr   = &p->data[2][y * p->linesize[2]];
yading@10:         for (x = 0; x < avctx->width; x += 4) {
yading@10:             luma[3] = (get_bits(&gb, 5)*33) >> 2;
yading@10:             luma[2] = (get_bits(&gb, 5)*33) >> 2;
yading@10:             luma[1] = (get_bits(&gb, 5)*33) >> 2;
yading@10:             luma[0] = (get_bits(&gb, 5)*33) >> 2;
yading@10:             luma += 4;
yading@10:             *(cb++) = get_bits(&gb, 6) << 2;
yading@10:             *(cr++) = get_bits(&gb, 6) << 2;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: static av_cold int decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     avctx->pix_fmt = AV_PIX_FMT_YUV411P;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_cljr_decoder = {
yading@10:     .name           = "cljr",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_CLJR,
yading@10:     .init           = decode_init,
yading@10:     .decode         = decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
yading@10: };
yading@10: #endif
yading@10: 
yading@10: #if CONFIG_CLJR_ENCODER
yading@10: typedef struct CLJRContext {
yading@10:     AVClass        *avclass;
yading@10:     AVFrame         picture;
yading@10:     int             dither_type;
yading@10: } CLJRContext;
yading@10: 
yading@10: static av_cold int encode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     CLJRContext * const a = avctx->priv_data;
yading@10: 
yading@10:     avctx->coded_frame = &a->picture;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
yading@10:                         const AVFrame *p, int *got_packet)
yading@10: {
yading@10:     CLJRContext *a = avctx->priv_data;
yading@10:     PutBitContext pb;
yading@10:     int x, y, ret;
yading@10:     uint32_t dither= avctx->frame_number;
yading@10:     static const uint32_t ordered_dither[2][2] =
yading@10:     {
yading@10:         { 0x10400000, 0x104F0000 },
yading@10:         { 0xCB2A0000, 0xCB250000 },
yading@10:     };
yading@10: 
yading@10:     if ((ret = ff_alloc_packet2(avctx, pkt, 32*avctx->height*avctx->width/4)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
yading@10:     avctx->coded_frame->key_frame = 1;
yading@10: 
yading@10:     init_put_bits(&pb, pkt->data, pkt->size);
yading@10: 
yading@10:     for (y = 0; y < avctx->height; y++) {
yading@10:         uint8_t *luma = &p->data[0][y * p->linesize[0]];
yading@10:         uint8_t *cb   = &p->data[1][y * p->linesize[1]];
yading@10:         uint8_t *cr   = &p->data[2][y * p->linesize[2]];
yading@10:         for (x = 0; x < avctx->width; x += 4) {
yading@10:             switch (a->dither_type) {
yading@10:             case 0: dither = 0x492A0000;                       break;
yading@10:             case 1: dither = dither * 1664525 + 1013904223;    break;
yading@10:             case 2: dither = ordered_dither[ y&1 ][ (x>>2)&1 ];break;
yading@10:             }
yading@10:             put_bits(&pb, 5, (249*(luma[3] +  (dither>>29)   )) >> 11);
yading@10:             put_bits(&pb, 5, (249*(luma[2] + ((dither>>26)&7))) >> 11);
yading@10:             put_bits(&pb, 5, (249*(luma[1] + ((dither>>23)&7))) >> 11);
yading@10:             put_bits(&pb, 5, (249*(luma[0] + ((dither>>20)&7))) >> 11);
yading@10:             luma += 4;
yading@10:             put_bits(&pb, 6, (253*(*(cb++) + ((dither>>18)&3))) >> 10);
yading@10:             put_bits(&pb, 6, (253*(*(cr++) + ((dither>>16)&3))) >> 10);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     flush_put_bits(&pb);
yading@10: 
yading@10:     pkt->size   = put_bits_count(&pb) / 8;
yading@10:     pkt->flags |= AV_PKT_FLAG_KEY;
yading@10:     *got_packet = 1;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: #define OFFSET(x) offsetof(CLJRContext, x)
yading@10: #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
yading@10: static const AVOption options[] = {
yading@10:     { "dither_type",   "Dither type",   OFFSET(dither_type),        AV_OPT_TYPE_INT, { .i64=1 }, 0, 2, VE},
yading@10:     { NULL },
yading@10: };
yading@10: 
yading@10: static const AVClass class = {
yading@10:     .class_name = "cljr encoder",
yading@10:     .item_name  = av_default_item_name,
yading@10:     .option     = options,
yading@10:     .version    = LIBAVUTIL_VERSION_INT,
yading@10: };
yading@10: 
yading@10: AVCodec ff_cljr_encoder = {
yading@10:     .name           = "cljr",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_CLJR,
yading@10:     .priv_data_size = sizeof(CLJRContext),
yading@10:     .init           = encode_init,
yading@10:     .encode2        = encode_frame,
yading@10:     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,
yading@10:                                                    AV_PIX_FMT_NONE },
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
yading@10:     .priv_class     = &class,
yading@10: };
yading@10: #endif