| 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 | |
| 27 | static av_cold int avui_decode_init(AVCodecContext *avctx) |
| 28 | { |
| 29 | avctx->pix_fmt = AV_PIX_FMT_YUVA422P; |
| 30 | return 0; |
| 31 | } |
| 32 | |
| 33 | static 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 | |
| 122 | AVCodec 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 | }; |