1/* 2 * Cirrus Logic AccuPak (CLJR) decoder 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 decoder. 25 */ 26 27#include "avcodec.h" 28#include "get_bits.h" 29#include "internal.h" 30 31static int decode_frame(AVCodecContext *avctx, 32 void *data, int *got_frame, 33 AVPacket *avpkt) 34{ 35 const uint8_t *buf = avpkt->data; 36 int buf_size = avpkt->size; 37 GetBitContext gb; 38 AVFrame * const p = data; 39 int x, y, ret; 40 41 if (avctx->height <= 0 || avctx->width <= 0) { 42 av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n"); 43 return AVERROR_INVALIDDATA; 44 } 45 46 if (buf_size / avctx->height < avctx->width) { 47 av_log(avctx, AV_LOG_ERROR, 48 "Resolution larger than buffer size. Invalid header?\n"); 49 return AVERROR_INVALIDDATA; 50 } 51 52 if ((ret = ff_get_buffer(avctx, p, 0)) < 0) 53 return ret; 54 p->pict_type = AV_PICTURE_TYPE_I; 55 p->key_frame = 1; 56 57 init_get_bits(&gb, buf, buf_size * 8); 58 59 for (y = 0; y < avctx->height; y++) { 60 uint8_t *luma = &p->data[0][y * p->linesize[0]]; 61 uint8_t *cb = &p->data[1][y * p->linesize[1]]; 62 uint8_t *cr = &p->data[2][y * p->linesize[2]]; 63 for (x = 0; x < avctx->width; x += 4) { 64 luma[3] = (get_bits(&gb, 5)*33) >> 2; 65 luma[2] = (get_bits(&gb, 5)*33) >> 2; 66 luma[1] = (get_bits(&gb, 5)*33) >> 2; 67 luma[0] = (get_bits(&gb, 5)*33) >> 2; 68 luma += 4; 69 *(cb++) = get_bits(&gb, 6) << 2; 70 *(cr++) = get_bits(&gb, 6) << 2; 71 } 72 } 73 74 *got_frame = 1; 75 76 return buf_size; 77} 78 79static av_cold int decode_init(AVCodecContext *avctx) 80{ 81 avctx->pix_fmt = AV_PIX_FMT_YUV411P; 82 return 0; 83} 84 85AVCodec ff_cljr_decoder = { 86 .name = "cljr", 87 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"), 88 .type = AVMEDIA_TYPE_VIDEO, 89 .id = AV_CODEC_ID_CLJR, 90 .init = decode_init, 91 .decode = decode_frame, 92 .capabilities = CODEC_CAP_DR1, 93}; 94 95