2 * Copyright (c) 2016 Michael Niedermayer
4 * This file is part of FFmpeg.
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.
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.
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
21 #include "libavutil/intreadwrite.h"
27 static av_cold int m101_decode_init(AVCodecContext *avctx)
29 if (avctx->extradata_size < 6*4)
30 return AVERROR_INVALIDDATA;
32 if (avctx->extradata[2*4] == 10)
33 avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
35 avctx->pix_fmt = AV_PIX_FMT_YUYV422;
41 static int m101_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
44 const uint8_t *buf = avpkt->data;
47 int min_stride = 2 * avctx->width;
48 int bits = avctx->extradata[2*4];
49 AVFrame *frame = data;
51 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
53 frame->pict_type = AV_PICTURE_TYPE_I;
56 stride = AV_RL32(avctx->extradata + 5*4);
58 if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
59 min_stride = (avctx->width + 15) / 16 * 20;
61 if (stride < min_stride || avpkt->size < stride * (uint64_t)avctx->height) {
62 av_log(avctx, AV_LOG_ERROR, "stride (%d) is invalid for packet sized %d\n",
64 return AVERROR_INVALIDDATA;
67 frame->interlaced_frame = ((avctx->extradata[3*4] & 3) != 3);
68 if (frame->interlaced_frame)
69 frame->top_field_first = avctx->extradata[3*4] & 1;
71 for (y = 0; y < avctx->height; y++) {
73 if (frame->interlaced_frame)
74 src_y = ((y&1)^frame->top_field_first) ? y/2 : (y/2 + avctx->height/2);
76 uint8_t *line = frame->data[0] + y*frame->linesize[0];
77 memcpy(line, buf + src_y*stride, 2*avctx->width);
80 uint16_t *luma = (uint16_t*)&frame->data[0][y*frame->linesize[0]];
81 uint16_t *cb = (uint16_t*)&frame->data[1][y*frame->linesize[1]];
82 uint16_t *cr = (uint16_t*)&frame->data[2][y*frame->linesize[2]];
83 for (block = 0; 16*block < avctx->width; block ++) {
84 const uint8_t *buf_src = buf + src_y*stride + 40*block;
85 for (x = 0; x < 16 && x + 16*block < avctx->width; x++) {
86 int xd = x + 16*block;
88 luma [xd] = (4*buf_src[2*x + 0]) + ((buf_src[32 + (x>>1)]>>4)&3);
90 luma [xd] = (4*buf_src[2*x + 0]) + (buf_src[32 + (x>>1)] &3);
91 cb[xd>>1] = (4*buf_src[2*x + 1]) + ((buf_src[32 + (x>>1)]>>2)&3);
92 cr[xd>>1] = (4*buf_src[2*x + 3]) + (buf_src[32 + (x>>1)]>>6);
103 AVCodec ff_m101_decoder = {
105 .long_name = NULL_IF_CONFIG_SMALL("Matrox Uncompressed SD"),
106 .type = AVMEDIA_TYPE_VIDEO,
107 .id = AV_CODEC_ID_M101,
108 .init = m101_decode_init,
109 .decode = m101_decode_frame,
110 .capabilities = AV_CODEC_CAP_DR1,