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 26static av_cold int yuv4_decode_init(AVCodecContext *avctx) 27{ 28 avctx->pix_fmt = AV_PIX_FMT_YUV420P; 29 30 return 0; 31} 32 33static 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 76AVCodec 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}; 85