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| | 1 | /* |
| | 2 | * Copyright (c) 2016 Michael Niedermayer |
| | 3 | * |
| | 4 | * This file is part of FFmpeg. |
| | 5 | * |
| | 6 | * FFmpeg is free software; you can redistribute it and/or |
| | 7 | * modify it under the terms of the GNU Lesser General Public |
| | 8 | * License as published by the Free Software Foundation; either |
| | 9 | * version 2.1 of the License, or (at your option) any later version. |
| | 10 | * |
| | 11 | * FFmpeg is distributed in the hope that it will be useful, |
| | 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| | 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| | 14 | * Lesser General Public License for more details. |
| | 15 | * |
| | 16 | * You should have received a copy of the GNU Lesser General Public |
| | 17 | * License along with FFmpeg; if not, write to the Free Software |
| | 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| | 19 | */ |
| | 20 | |
| | 21 | #include "libavutil/intreadwrite.h" |
| | 22 | |
| | 23 | #include "avcodec.h" |
| | 24 | #include "internal.h" |
| | 25 | |
| | 26 | |
| | 27 | static av_cold int m101_decode_init(AVCodecContext *avctx) |
| | 28 | { |
| | 29 | if (avctx->extradata_size < 6*4) |
| | 30 | return AVERROR_INVALIDDATA; |
| | 31 | |
| | 32 | if (avctx->extradata[2*4] == 10) |
| | 33 | avctx->pix_fmt = AV_PIX_FMT_YUV422P10; |
| | 34 | else |
| | 35 | avctx->pix_fmt = AV_PIX_FMT_YUYV422; |
| | 36 | |
| | 37 | |
| | 38 | return 0; |
| | 39 | } |
| | 40 | |
| | 41 | static int m101_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
| | 42 | AVPacket *avpkt) |
| | 43 | { |
| | 44 | const uint8_t *buf = avpkt->data; |
| | 45 | int stride, ret; |
| | 46 | int x, y; |
| | 47 | int min_stride = 2 * avctx->width; |
| | 48 | uint8_t *line; |
| | 49 | int bits = avctx->extradata[2*4]; |
| | 50 | AVFrame *frame = data; |
| | 51 | |
| | 52 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| | 53 | return ret; |
| | 54 | frame->pict_type = AV_PICTURE_TYPE_I; |
| | 55 | frame->key_frame = 1; |
| | 56 | |
| | 57 | stride = AV_RL32(avctx->extradata + 5*4); |
| | 58 | |
| | 59 | if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10) |
| | 60 | min_stride = (avctx->width + 15) / 16 * 20; |
| | 61 | |
| | 62 | if (stride < min_stride || avpkt->size < stride * (uint64_t)avctx->height) { |
| | 63 | av_log(avctx, AV_LOG_ERROR, "stride (%d) is invalid for packet sized %d\n", |
| | 64 | stride, avpkt->size); |
| | 65 | return AVERROR_INVALIDDATA; |
| | 66 | } |
| | 67 | |
| | 68 | line = frame->data[0]; |
| | 69 | frame->interlaced_frame = ((avctx->extradata[3*4] & 3) != 3); |
| | 70 | if (frame->interlaced_frame) |
| | 71 | frame->top_field_first = avctx->extradata[3*4] & 1; |
| | 72 | |
| | 73 | for (y = 0; y < avctx->height; y++) { |
| | 74 | int src_y = y; |
| | 75 | if (frame->interlaced_frame) |
| | 76 | src_y = ((y&1)^frame->top_field_first) ? y/2 : (y/2 + avctx->height/2); |
| | 77 | if (bits == 8) { |
| | 78 | for (x = 0; x < avctx->width; x++) { |
| | 79 | line[y*frame->linesize[0] + 2*x + 0] = buf[src_y*stride + 2*x + 0]; |
| | 80 | line[y*frame->linesize[0] + 2*x + 1] = buf[src_y*stride + 2*x + 1]; |
| | 81 | } |
| | 82 | } else { |
| | 83 | int block; |
| | 84 | uint16_t *luma = (uint16_t*)&frame->data[0][y*frame->linesize[0]]; |
| | 85 | uint16_t *cb = (uint16_t*)&frame->data[1][y*frame->linesize[1]]; |
| | 86 | uint16_t *cr = (uint16_t*)&frame->data[2][y*frame->linesize[2]]; |
| | 87 | for (block = 0; 16*block < avctx->width; block ++) { |
| | 88 | const uint8_t *buf_src = buf + src_y*stride + 40*block; |
| | 89 | for (x = 0; x < 16 && x + 16*block < avctx->width; x++) { |
| | 90 | int xd = x + 16*block; |
| | 91 | if (!(x&1)) { |
| | 92 | luma [xd] = (4*buf_src[2*x + 0]) + (buf_src[32 + (x>>1)] &3); |
| | 93 | cb[xd>>1] = (4*buf_src[2*x + 1]) + ((buf_src[32 + (x>>1)]>>2)&3); |
| | 94 | cr[xd>>1] = (4*buf_src[2*x + 3]) + (buf_src[32 + (x>>1)]>>6); |
| | 95 | } else { |
| | 96 | luma [xd] = (4*buf_src[2*x + 0]) + ((buf_src[32 + (x>>1)]>>4)&3); |
| | 97 | } |
| | 98 | } |
| | 99 | } |
| | 100 | } |
| | 101 | } |
| | 102 | |
| | 103 | *got_frame = 1; |
| | 104 | return avpkt->size; |
| | 105 | } |
| | 106 | |
| | 107 | AVCodec ff_m101_decoder = { |
| | 108 | .name = "m101", |
| | 109 | .long_name = NULL_IF_CONFIG_SMALL("Matrox Uncompressed SD"), |
| | 110 | .type = AVMEDIA_TYPE_VIDEO, |
| | 111 | .id = AV_CODEC_ID_M101, |
| | 112 | .priv_data_size = 0, |
| | 113 | .init = m101_decode_init, |
| | 114 | .decode = m101_decode_frame, |
| | 115 | .capabilities = AV_CODEC_CAP_DR1, |
| | 116 | }; |