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 "codec_internal.h" 29#include "get_bits.h" 30#include "internal.h" 31 32static int decode_frame(AVCodecContext *avctx, AVFrame *p, 33 int *got_frame, AVPacket *avpkt) 34{ 35 const uint8_t *buf = avpkt->data; 36 int buf_size = avpkt->size; 37 GetBitContext gb; 38 int x, y, ret; 39 40 if (avctx->height <= 0 || avctx->width <= 0) { 41 av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n"); 42 return AVERROR_INVALIDDATA; 43 } 44 45 if (buf_size / avctx->height < avctx->width) { 46 av_log(avctx, AV_LOG_ERROR, 47 "Resolution larger than buffer size. Invalid header?\n"); 48 return AVERROR_INVALIDDATA; 49 } 50 51 if ((ret = ff_get_buffer(avctx, p, 0)) < 0) 52 return ret; 53 p->pict_type = AV_PICTURE_TYPE_I; 54 p->key_frame = 1; 55 56 init_get_bits(&gb, buf, buf_size * 8); 57 58 for (y = 0; y < avctx->height; y++) { 59 uint8_t *luma = &p->data[0][y * p->linesize[0]]; 60 uint8_t *cb = &p->data[1][y * p->linesize[1]]; 61 uint8_t *cr = &p->data[2][y * p->linesize[2]]; 62 for (x = 0; x < avctx->width; x += 4) { 63 luma[3] = (get_bits(&gb, 5)*33) >> 2; 64 luma[2] = (get_bits(&gb, 5)*33) >> 2; 65 luma[1] = (get_bits(&gb, 5)*33) >> 2; 66 luma[0] = (get_bits(&gb, 5)*33) >> 2; 67 luma += 4; 68 *(cb++) = get_bits(&gb, 6) << 2; 69 *(cr++) = get_bits(&gb, 6) << 2; 70 } 71 } 72 73 *got_frame = 1; 74 75 return buf_size; 76} 77 78static av_cold int decode_init(AVCodecContext *avctx) 79{ 80 avctx->pix_fmt = AV_PIX_FMT_YUV411P; 81 return 0; 82} 83 84const FFCodec ff_cljr_decoder = { 85 .p.name = "cljr", 86 .p.long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"), 87 .p.type = AVMEDIA_TYPE_VIDEO, 88 .p.id = AV_CODEC_ID_CLJR, 89 .init = decode_init, 90 FF_CODEC_DECODE_CB(decode_frame), 91 .p.capabilities = AV_CODEC_CAP_DR1, 92 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 93}; 94 95