| 1 | /* |
| 2 | * libquicktime yuv4 decoder |
| 3 | * |
| 4 | * Copyright (c) 2011 Carl Eugen Hoyos |
| 5 | * |
| 6 | * This file is part of FFmpeg. |
| 7 | * |
| 8 | * FFmpeg 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 | * FFmpeg 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 FFmpeg; 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" |
| 24 | #include "internal.h" |
| 25 | |
| 26 | static av_cold int yuv4_decode_init(AVCodecContext *avctx) |
| 27 | { |
| 28 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| 29 | |
| 30 | return 0; |
| 31 | } |
| 32 | |
| 33 | static int yuv4_decode_frame(AVCodecContext *avctx, void *data, |
| 34 | int *got_frame, AVPacket *avpkt) |
| 35 | { |
| 36 | AVFrame *pic = data; |
| 37 | const uint8_t *src = avpkt->data; |
| 38 | uint8_t *y, *u, *v; |
| 39 | int i, j, ret; |
| 40 | |
| 41 | if (avpkt->size < 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1)) { |
| 42 | av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n"); |
| 43 | return AVERROR(EINVAL); |
| 44 | } |
| 45 | |
| 46 | if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
| 47 | return ret; |
| 48 | |
| 49 | pic->key_frame = 1; |
| 50 | pic->pict_type = AV_PICTURE_TYPE_I; |
| 51 | |
| 52 | y = pic->data[0]; |
| 53 | u = pic->data[1]; |
| 54 | v = pic->data[2]; |
| 55 | |
| 56 | for (i = 0; i < (avctx->height + 1) >> 1; i++) { |
| 57 | for (j = 0; j < (avctx->width + 1) >> 1; j++) { |
| 58 | u[j] = *src++ ^ 0x80; |
| 59 | v[j] = *src++ ^ 0x80; |
| 60 | y[ 2 * j ] = *src++; |
| 61 | y[ 2 * j + 1] = *src++; |
| 62 | y[pic->linesize[0] + 2 * j ] = *src++; |
| 63 | y[pic->linesize[0] + 2 * j + 1] = *src++; |
| 64 | } |
| 65 | |
| 66 | y += 2 * pic->linesize[0]; |
| 67 | u += pic->linesize[1]; |
| 68 | v += pic->linesize[2]; |
| 69 | } |
| 70 | |
| 71 | *got_frame = 1; |
| 72 | |
| 73 | return avpkt->size; |
| 74 | } |
| 75 | |
| 76 | AVCodec ff_yuv4_decoder = { |
| 77 | .name = "yuv4", |
| 78 | .long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"), |
| 79 | .type = AVMEDIA_TYPE_VIDEO, |
| 80 | .id = AV_CODEC_ID_YUV4, |
| 81 | .init = yuv4_decode_init, |
| 82 | .decode = yuv4_decode_frame, |
| 83 | .capabilities = CODEC_CAP_DR1, |
| 84 | }; |