1/* 2 * y41p decoder 3 * 4 * Copyright (c) 2012 Paul B Mahol 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 y41p_decode_init(AVCodecContext *avctx) 27{ 28 avctx->pix_fmt = AV_PIX_FMT_YUV411P; 29 avctx->bits_per_raw_sample = 12; 30 31 if (avctx->width & 7) { 32 av_log(avctx, AV_LOG_WARNING, "y41p requires width to be divisible by 8.\n"); 33 } 34 35 return 0; 36} 37 38static int y41p_decode_frame(AVCodecContext *avctx, void *data, 39 int *got_frame, AVPacket *avpkt) 40{ 41 AVFrame *pic = data; 42 uint8_t *src = avpkt->data; 43 uint8_t *y, *u, *v; 44 int i, j, ret; 45 46 if (avpkt->size < 1.5 * avctx->height * avctx->width) { 47 av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n"); 48 return AVERROR(EINVAL); 49 } 50 51 if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) 52 return ret; 53 54 pic->key_frame = 1; 55 pic->pict_type = AV_PICTURE_TYPE_I; 56 57 for (i = avctx->height - 1; i >= 0 ; i--) { 58 y = &pic->data[0][i * pic->linesize[0]]; 59 u = &pic->data[1][i * pic->linesize[1]]; 60 v = &pic->data[2][i * pic->linesize[2]]; 61 for (j = 0; j < avctx->width; j += 8) { 62 *(u++) = *src++; 63 *(y++) = *src++; 64 *(v++) = *src++; 65 *(y++) = *src++; 66 67 *(u++) = *src++; 68 *(y++) = *src++; 69 *(v++) = *src++; 70 *(y++) = *src++; 71 72 *(y++) = *src++; 73 *(y++) = *src++; 74 *(y++) = *src++; 75 *(y++) = *src++; 76 } 77 } 78 79 *got_frame = 1; 80 81 return avpkt->size; 82} 83 84AVCodec ff_y41p_decoder = { 85 .name = "y41p", 86 .long_name = NULL_IF_CONFIG_SMALL("Uncompressed YUV 4:1:1 12-bit"), 87 .type = AVMEDIA_TYPE_VIDEO, 88 .id = AV_CODEC_ID_Y41P, 89 .init = y41p_decode_init, 90 .decode = y41p_decode_frame, 91 .capabilities = CODEC_CAP_DR1, 92}; 93