mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
118 lines
4.1 KiB
C
118 lines
4.1 KiB
C
/*
|
|
* Copyright (c) 2016 Michael Niedermayer
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
|
|
|
|
static av_cold int m101_decode_init(AVCodecContext *avctx)
|
|
{
|
|
if (avctx->extradata_size < 6*4) {
|
|
avpriv_request_sample(avctx, "Missing or too small extradata (size %d)", avctx->extradata_size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (avctx->extradata[2*4] == 10)
|
|
avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
|
|
else if (avctx->extradata[2*4] == 8) {
|
|
avctx->pix_fmt = AV_PIX_FMT_YUYV422;
|
|
} else {
|
|
avpriv_request_sample(avctx, "BPS %d", avctx->extradata[2*4]);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int m101_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
|
|
AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int stride, ret;
|
|
int x, y;
|
|
int min_stride = 2 * avctx->width;
|
|
int bits = avctx->extradata[2*4];
|
|
AVFrame *frame = data;
|
|
|
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
|
|
return ret;
|
|
frame->pict_type = AV_PICTURE_TYPE_I;
|
|
frame->key_frame = 1;
|
|
|
|
stride = AV_RL32(avctx->extradata + 5*4);
|
|
|
|
if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
|
|
min_stride = (avctx->width + 15) / 16 * 40;
|
|
|
|
if (stride < min_stride || avpkt->size < stride * (uint64_t)avctx->height) {
|
|
av_log(avctx, AV_LOG_ERROR, "stride (%d) is invalid for packet sized %d\n",
|
|
stride, avpkt->size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
frame->interlaced_frame = ((avctx->extradata[3*4] & 3) != 3);
|
|
if (frame->interlaced_frame)
|
|
frame->top_field_first = avctx->extradata[3*4] & 1;
|
|
|
|
for (y = 0; y < avctx->height; y++) {
|
|
int src_y = y;
|
|
if (frame->interlaced_frame)
|
|
src_y = ((y&1)^frame->top_field_first) ? y/2 : (y/2 + avctx->height/2);
|
|
if (bits == 8) {
|
|
uint8_t *line = frame->data[0] + y*frame->linesize[0];
|
|
memcpy(line, buf + src_y*stride, 2*avctx->width);
|
|
} else {
|
|
int block;
|
|
uint16_t *luma = (uint16_t*)&frame->data[0][y*frame->linesize[0]];
|
|
uint16_t *cb = (uint16_t*)&frame->data[1][y*frame->linesize[1]];
|
|
uint16_t *cr = (uint16_t*)&frame->data[2][y*frame->linesize[2]];
|
|
for (block = 0; 16*block < avctx->width; block ++) {
|
|
const uint8_t *buf_src = buf + src_y*stride + 40*block;
|
|
for (x = 0; x < 16 && x + 16*block < avctx->width; x++) {
|
|
int xd = x + 16*block;
|
|
if (x&1) {
|
|
luma [xd] = (4*buf_src[2*x + 0]) + ((buf_src[32 + (x>>1)]>>4)&3);
|
|
} else {
|
|
luma [xd] = (4*buf_src[2*x + 0]) + (buf_src[32 + (x>>1)] &3);
|
|
cb[xd>>1] = (4*buf_src[2*x + 1]) + ((buf_src[32 + (x>>1)]>>2)&3);
|
|
cr[xd>>1] = (4*buf_src[2*x + 3]) + (buf_src[32 + (x>>1)]>>6);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
*got_frame = 1;
|
|
return avpkt->size;
|
|
}
|
|
|
|
const AVCodec ff_m101_decoder = {
|
|
.name = "m101",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Matrox Uncompressed SD"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_M101,
|
|
.init = m101_decode_init,
|
|
.decode = m101_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
|
|
};
|