mirror of
https://github.com/FFmpeg/FFmpeg.git
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112 lines
3.8 KiB
C
112 lines
3.8 KiB
C
/*
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* Copyright (c) 2016 Michael Niedermayer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "internal.h"
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static av_cold int m101_decode_init(AVCodecContext *avctx)
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{
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if (avctx->extradata_size < 6*4)
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return AVERROR_INVALIDDATA;
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if (avctx->extradata[2*4] == 10)
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avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
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else
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avctx->pix_fmt = AV_PIX_FMT_YUYV422;
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return 0;
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}
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static int m101_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int stride, ret;
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int x, y;
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int min_stride = 2 * avctx->width;
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int bits = avctx->extradata[2*4];
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AVFrame *frame = data;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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frame->pict_type = AV_PICTURE_TYPE_I;
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frame->key_frame = 1;
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stride = AV_RL32(avctx->extradata + 5*4);
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if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
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min_stride = (avctx->width + 15) / 16 * 20;
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if (stride < min_stride || avpkt->size < stride * (uint64_t)avctx->height) {
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av_log(avctx, AV_LOG_ERROR, "stride (%d) is invalid for packet sized %d\n",
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stride, avpkt->size);
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return AVERROR_INVALIDDATA;
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}
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frame->interlaced_frame = ((avctx->extradata[3*4] & 3) != 3);
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if (frame->interlaced_frame)
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frame->top_field_first = avctx->extradata[3*4] & 1;
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for (y = 0; y < avctx->height; y++) {
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int src_y = y;
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if (frame->interlaced_frame)
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src_y = ((y&1)^frame->top_field_first) ? y/2 : (y/2 + avctx->height/2);
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if (bits == 8) {
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uint8_t *line = frame->data[0] + y*frame->linesize[0];
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memcpy(line, buf + src_y*stride, 2*avctx->width);
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} else {
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int block;
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uint16_t *luma = (uint16_t*)&frame->data[0][y*frame->linesize[0]];
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uint16_t *cb = (uint16_t*)&frame->data[1][y*frame->linesize[1]];
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uint16_t *cr = (uint16_t*)&frame->data[2][y*frame->linesize[2]];
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for (block = 0; 16*block < avctx->width; block ++) {
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const uint8_t *buf_src = buf + src_y*stride + 40*block;
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for (x = 0; x < 16 && x + 16*block < avctx->width; x++) {
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int xd = x + 16*block;
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if (x&1) {
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luma [xd] = (4*buf_src[2*x + 0]) + ((buf_src[32 + (x>>1)]>>4)&3);
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} else {
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luma [xd] = (4*buf_src[2*x + 0]) + (buf_src[32 + (x>>1)] &3);
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cb[xd>>1] = (4*buf_src[2*x + 1]) + ((buf_src[32 + (x>>1)]>>2)&3);
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cr[xd>>1] = (4*buf_src[2*x + 3]) + (buf_src[32 + (x>>1)]>>6);
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}
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}
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}
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}
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}
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*got_frame = 1;
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return avpkt->size;
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}
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AVCodec ff_m101_decoder = {
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.name = "m101",
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.long_name = NULL_IF_CONFIG_SMALL("Matrox Uncompressed SD"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_M101,
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.init = m101_decode_init,
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.decode = m101_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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