| 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 | |
| 31 | static 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 | |
| 79 | static av_cold int decode_init(AVCodecContext *avctx) |
| 80 | { |
| 81 | avctx->pix_fmt = AV_PIX_FMT_YUV411P; |
| 82 | return 0; |
| 83 | } |
| 84 | |
| 85 | AVCodec 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 | |