1/* 2 * AVID Meridien decoder 3 * 4 * Copyright (c) 2012 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#include "libavutil/intreadwrite.h" 26 27static av_cold int avui_decode_init(AVCodecContext *avctx) 28{ 29 avctx->pix_fmt = AV_PIX_FMT_YUVA422P; 30 return 0; 31} 32 33static int avui_decode_frame(AVCodecContext *avctx, void *data, 34 int *got_frame, AVPacket *avpkt) 35{ 36 int ret; 37 AVFrame *pic = data; 38 const uint8_t *src = avpkt->data, *extradata = avctx->extradata; 39 const uint8_t *srca; 40 uint8_t *y, *u, *v, *a; 41 int transparent, interlaced = 1, skip, opaque_length, i, j, k; 42 uint32_t extradata_size = avctx->extradata_size; 43 44 while (extradata_size >= 24) { 45 uint32_t atom_size = AV_RB32(extradata); 46 if (!memcmp(&extradata[4], "APRGAPRG0001", 12)) { 47 interlaced = extradata[19] != 1; 48 break; 49 } 50 if (atom_size && atom_size <= extradata_size) { 51 extradata += atom_size; 52 extradata_size -= atom_size; 53 } else { 54 break; 55 } 56 } 57 if (avctx->height == 486) { 58 skip = 10; 59 } else { 60 skip = 16; 61 } 62 opaque_length = 2 * avctx->width * (avctx->height + skip) + 4 * interlaced; 63 if (avpkt->size < opaque_length) { 64 av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n"); 65 return AVERROR(EINVAL); 66 } 67 transparent = avctx->bits_per_coded_sample == 32 && 68 avpkt->size >= opaque_length * 2 + 4; 69 srca = src + opaque_length + 5; 70 71 if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) 72 return ret; 73 74 pic->key_frame = 1; 75 pic->pict_type = AV_PICTURE_TYPE_I; 76 77 if (!interlaced) { 78 src += avctx->width * skip; 79 srca += avctx->width * skip; 80 } 81 82 for (i = 0; i < interlaced + 1; i++) { 83 src += avctx->width * skip; 84 srca += avctx->width * skip; 85 if (interlaced && avctx->height == 486) { 86 y = pic->data[0] + (1 - i) * pic->linesize[0]; 87 u = pic->data[1] + (1 - i) * pic->linesize[1]; 88 v = pic->data[2] + (1 - i) * pic->linesize[2]; 89 a = pic->data[3] + (1 - i) * pic->linesize[3]; 90 } else { 91 y = pic->data[0] + i * pic->linesize[0]; 92 u = pic->data[1] + i * pic->linesize[1]; 93 v = pic->data[2] + i * pic->linesize[2]; 94 a = pic->data[3] + i * pic->linesize[3]; 95 } 96 97 for (j = 0; j < avctx->height >> interlaced; j++) { 98 for (k = 0; k < avctx->width >> 1; k++) { 99 u[ k ] = *src++; 100 y[2 * k ] = *src++; 101 a[2 * k ] = 0xFF - (transparent ? *srca++ : 0); 102 srca++; 103 v[ k ] = *src++; 104 y[2 * k + 1] = *src++; 105 a[2 * k + 1] = 0xFF - (transparent ? *srca++ : 0); 106 srca++; 107 } 108 109 y += (interlaced + 1) * pic->linesize[0]; 110 u += (interlaced + 1) * pic->linesize[1]; 111 v += (interlaced + 1) * pic->linesize[2]; 112 a += (interlaced + 1) * pic->linesize[3]; 113 } 114 src += 4; 115 srca += 4; 116 } 117 *got_frame = 1; 118 119 return avpkt->size; 120} 121 122AVCodec ff_avui_decoder = { 123 .name = "avui", 124 .long_name = NULL_IF_CONFIG_SMALL("Avid Meridien Uncompressed"), 125 .type = AVMEDIA_TYPE_VIDEO, 126 .id = AV_CODEC_ID_AVUI, 127 .init = avui_decode_init, 128 .decode = avui_decode_frame, 129 .capabilities = CODEC_CAP_DR1, 130}; 131