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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * AVID Meridien decoder |
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| 3 | * |
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| 4 | * Copyright (c) 2012 Carl Eugen Hoyos |
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| 5 | * |
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| 6 | * This file is part of FFmpeg. |
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| 7 | * |
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| 8 | * FFmpeg is free software; you can redistribute it and/or |
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| 9 | * modify it under the terms of the GNU Lesser General Public |
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| 10 | * License as published by the Free Software Foundation; either |
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| 11 | * version 2.1 of the License, or (at your option) any later version. |
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| 12 | * |
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| 13 | * FFmpeg is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * Lesser General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU Lesser General Public |
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| 19 | * License along with FFmpeg; if not, write to the Free Software |
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| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 21 | */ |
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| 22 | |||
| 23 | #include "avcodec.h" |
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| 24 | #include "internal.h" |
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| 25 | #include "libavutil/intreadwrite.h" |
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| 26 | |||
| 27 | static av_cold int avui_decode_init(AVCodecContext *avctx) |
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| 28 | { |
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| 29 | avctx->pix_fmt = AV_PIX_FMT_YUVA422P; |
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| 30 | return 0; |
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| 31 | } |
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| 32 | |||
| 33 | static int avui_decode_frame(AVCodecContext *avctx, void *data, |
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| 34 | int *got_frame, AVPacket *avpkt) |
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| 35 | { |
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| 36 | int ret; |
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| 37 | AVFrame *pic = data; |
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| 38 | const uint8_t *src = avpkt->data, *extradata = avctx->extradata; |
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| 39 | const uint8_t *srca; |
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| 40 | uint8_t *y, *u, *v, *a; |
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| 41 | int transparent, interlaced = 1, skip, opaque_length, i, j, k; |
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| 42 | uint32_t extradata_size = avctx->extradata_size; |
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| 43 | |||
| 44 | while (extradata_size >= 24) { |
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| 45 | uint32_t atom_size = AV_RB32(extradata); |
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| 46 | if (!memcmp(&extradata[4], "APRGAPRG0001", 12)) { |
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| 47 | interlaced = extradata[19] != 1; |
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| 48 | break; |
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| 49 | } |
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| 50 | if (atom_size && atom_size <= extradata_size) { |
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| 51 | extradata += atom_size; |
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| 52 | extradata_size -= atom_size; |
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| 53 | } else { |
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| 54 | break; |
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| 55 | } |
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| 56 | } |
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| 57 | if (avctx->height == 486) { |
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| 58 | skip = 10; |
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| 59 | } else { |
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| 60 | skip = 16; |
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| 61 | } |
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| 62 | opaque_length = 2 * avctx->width * (avctx->height + skip) + 4 * interlaced; |
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| 63 | if (avpkt->size < opaque_length) { |
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| 64 | av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n"); |
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| 65 | return AVERROR(EINVAL); |
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| 66 | } |
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| 67 | transparent = avctx->bits_per_coded_sample == 32 && |
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| 68 | avpkt->size >= opaque_length * 2 + 4; |
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| 69 | srca = src + opaque_length + 5; |
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| 70 | |||
| 71 | if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
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| 72 | return ret; |
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| 73 | |||
| 74 | pic->key_frame = 1; |
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| 75 | pic->pict_type = AV_PICTURE_TYPE_I; |
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| 76 | |||
| 77 | if (!interlaced) { |
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| 78 | src += avctx->width * skip; |
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| 79 | srca += avctx->width * skip; |
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| 80 | } |
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| 81 | |||
| 82 | for (i = 0; i < interlaced + 1; i++) { |
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| 83 | src += avctx->width * skip; |
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| 84 | srca += avctx->width * skip; |
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| 85 | if (interlaced && avctx->height == 486) { |
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| 86 | y = pic->data[0] + (1 - i) * pic->linesize[0]; |
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| 87 | u = pic->data[1] + (1 - i) * pic->linesize[1]; |
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| 88 | v = pic->data[2] + (1 - i) * pic->linesize[2]; |
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| 89 | a = pic->data[3] + (1 - i) * pic->linesize[3]; |
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| 90 | } else { |
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| 91 | y = pic->data[0] + i * pic->linesize[0]; |
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| 92 | u = pic->data[1] + i * pic->linesize[1]; |
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| 93 | v = pic->data[2] + i * pic->linesize[2]; |
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| 94 | a = pic->data[3] + i * pic->linesize[3]; |
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| 95 | } |
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| 96 | |||
| 97 | for (j = 0; j < avctx->height >> interlaced; j++) { |
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| 98 | for (k = 0; k < avctx->width >> 1; k++) { |
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| 99 | u[ k ] = *src++; |
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| 100 | y[2 * k ] = *src++; |
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| 101 | a[2 * k ] = 0xFF - (transparent ? *srca++ : 0); |
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| 102 | srca++; |
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| 103 | v[ k ] = *src++; |
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| 104 | y[2 * k + 1] = *src++; |
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| 105 | a[2 * k + 1] = 0xFF - (transparent ? *srca++ : 0); |
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| 106 | srca++; |
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| 107 | } |
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| 108 | |||
| 109 | y += (interlaced + 1) * pic->linesize[0]; |
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| 110 | u += (interlaced + 1) * pic->linesize[1]; |
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| 111 | v += (interlaced + 1) * pic->linesize[2]; |
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| 112 | a += (interlaced + 1) * pic->linesize[3]; |
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| 113 | } |
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| 114 | src += 4; |
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| 115 | srca += 4; |
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| 116 | } |
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| 117 | *got_frame = 1; |
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| 118 | |||
| 119 | return avpkt->size; |
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| 120 | } |
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| 121 | |||
| 122 | AVCodec ff_avui_decoder = { |
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| 123 | .name = "avui", |
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| 124 | .long_name = NULL_IF_CONFIG_SMALL("Avid Meridien Uncompressed"), |
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| 125 | .type = AVMEDIA_TYPE_VIDEO, |
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| 126 | .id = AV_CODEC_ID_AVUI, |
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| 127 | .init = avui_decode_init, |
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| 128 | .decode = avui_decode_frame, |
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| 129 | .capabilities = CODEC_CAP_DR1, |
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| 130 | }; |