projects / libav.git / blame
| Commit | Line | Data |
|---|---|---|
| 19341c58 KS |
1 | /* |
| 2 | * Dxtory decoder | |
| 3 | * | |
| 4 | * Copyright (c) 2011 Konstantin Shishkov | |
| 5 | * | |
| 6 | * This file is part of Libav. | |
| 7 | * | |
| 8 | * Libav is free software; you can redistribute it and/or | |
| 9 | * modify it under the terms of the GNU Lesser General Public | |
| 10 | * License as published by the Free Software Foundation; either | |
| 11 | * version 2.1 of the License, or (at your option) any later version. | |
| 12 | * | |
| 13 | * Libav is distributed in the hope that it will be useful, | |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 16 | * Lesser General Public License for more details. | |
| 17 | * | |
| 18 | * You should have received a copy of the GNU Lesser General Public | |
| 19 | * License along with Libav; if not, write to the Free Software | |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 21 | */ | |
| 22 | ||
| 23 | #include "avcodec.h" | |
| 1d9c2dc8 | 24 | #include "libavutil/common.h" |
| 19341c58 KS |
25 | #include "libavutil/intreadwrite.h" |
| 26 | ||
| 27 | static av_cold int decode_init(AVCodecContext *avctx) | |
| 28 | { | |
| 716d413c | 29 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| 19341c58 KS |
30 | avctx->coded_frame = avcodec_alloc_frame(); |
| 31 | if (!avctx->coded_frame) | |
| 32 | return AVERROR(ENOMEM); | |
| 33 | ||
| 34 | return 0; | |
| 35 | } | |
| 36 | ||
| 37 | static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, | |
| 38 | AVPacket *avpkt) | |
| 39 | { | |
| 40 | int h, w; | |
| 41 | AVFrame *pic = avctx->coded_frame; | |
| 42 | const uint8_t *src = avpkt->data; | |
| 43 | uint8_t *Y1, *Y2, *U, *V; | |
| 44 | int ret; | |
| 45 | ||
| 46 | if (pic->data[0]) | |
| 47 | avctx->release_buffer(avctx, pic); | |
| 48 | ||
| 49 | if (avpkt->size < avctx->width * avctx->height * 3 / 2 + 16) { | |
| 50 | av_log(avctx, AV_LOG_ERROR, "packet too small\n"); | |
| 51 | return AVERROR_INVALIDDATA; | |
| 52 | } | |
| 53 | ||
| 54 | pic->reference = 0; | |
| 55 | if ((ret = avctx->get_buffer(avctx, pic)) < 0) | |
| 56 | return ret; | |
| 57 | ||
| 58 | pic->pict_type = AV_PICTURE_TYPE_I; | |
| 59 | pic->key_frame = 1; | |
| 60 | ||
| 61 | if (AV_RL32(src) != 0x01000002) { | |
| 62 | av_log_ask_for_sample(avctx, "Unknown frame header %X\n", AV_RL32(src)); | |
| 63 | return AVERROR_PATCHWELCOME; | |
| 64 | } | |
| 65 | src += 16; | |
| 66 | ||
| 67 | Y1 = pic->data[0]; | |
| 68 | Y2 = pic->data[0] + pic->linesize[0]; | |
| 69 | U = pic->data[1]; | |
| 70 | V = pic->data[2]; | |
| 71 | for (h = 0; h < avctx->height; h += 2) { | |
| 72 | for (w = 0; w < avctx->width; w += 2) { | |
| 73 | AV_WN16A(Y1 + w, AV_RN16A(src)); | |
| 74 | AV_WN16A(Y2 + w, AV_RN16A(src + 2)); | |
| 75 | U[w >> 1] = src[4] + 0x80; | |
| 76 | V[w >> 1] = src[5] + 0x80; | |
| 77 | src += 6; | |
| 78 | } | |
| 79 | Y1 += pic->linesize[0] << 1; | |
| 80 | Y2 += pic->linesize[0] << 1; | |
| 81 | U += pic->linesize[1]; | |
| 82 | V += pic->linesize[2]; | |
| 83 | } | |
| 84 | ||
| 85 | *data_size = sizeof(AVFrame); | |
| 86 | *(AVFrame*)data = *pic; | |
| 87 | ||
| 88 | return avpkt->size; | |
| 89 | } | |
| 90 | ||
| 91 | static av_cold int decode_close(AVCodecContext *avctx) | |
| 92 | { | |
| 93 | AVFrame *pic = avctx->coded_frame; | |
| 94 | if (pic->data[0]) | |
| 95 | avctx->release_buffer(avctx, pic); | |
| 96 | av_freep(&avctx->coded_frame); | |
| 97 | ||
| 98 | return 0; | |
| 99 | } | |
| 100 | ||
| 101 | AVCodec ff_dxtory_decoder = { | |
| 102 | .name = "dxtory", | |
| 103 | .long_name = NULL_IF_CONFIG_SMALL("Dxtory"), | |
| 104 | .type = AVMEDIA_TYPE_VIDEO, | |
| 36ef5369 | 105 | .id = AV_CODEC_ID_DXTORY, |
| 19341c58 KS |
106 | .init = decode_init, |
| 107 | .close = decode_close, | |
| 108 | .decode = decode_frame, | |
| 109 | .capabilities = CODEC_CAP_DR1, | |
| 110 | }; |