mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
132 lines
3.9 KiB
C
132 lines
3.9 KiB
C
/*
|
|
* AVRn decoder
|
|
* Copyright (c) 2012 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 "avcodec.h"
|
|
#include "mjpeg.h"
|
|
#include "mjpegdec.h"
|
|
|
|
typedef struct {
|
|
MJpegDecodeContext mjpeg_ctx;
|
|
AVFrame frame;
|
|
int is_mjpeg;
|
|
int interlace; //FIXME use frame.interlaced_frame
|
|
int tff;
|
|
} AVRnContext;
|
|
|
|
static av_cold int init(AVCodecContext *avctx)
|
|
{
|
|
AVRnContext *a = avctx->priv_data;
|
|
|
|
// Support "Resolution 1:1" for Avid AVI Codec
|
|
a->is_mjpeg = avctx->extradata_size < 31 || memcmp(&avctx->extradata[28], "1:1", 3);
|
|
|
|
if(a->is_mjpeg)
|
|
return ff_mjpeg_decode_init(avctx);
|
|
|
|
if(avctx->width <= 0 || avctx->height <= 0)
|
|
return -1;
|
|
|
|
avcodec_get_frame_defaults(&a->frame);
|
|
avctx->pix_fmt = PIX_FMT_UYVY422;
|
|
|
|
if(avctx->extradata_size >= 9 && avctx->extradata[4]+28 < avctx->extradata_size) {
|
|
int ndx = avctx->extradata[4] + 4;
|
|
a->interlace = !memcmp(avctx->extradata + ndx, "1:1(", 4);
|
|
if(a->interlace) {
|
|
a->tff = avctx->extradata[ndx + 24] == 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold void end(AVCodecContext *avctx)
|
|
{
|
|
AVRnContext *a = avctx->priv_data;
|
|
AVFrame *p = &a->frame;
|
|
|
|
if(p->data[0])
|
|
avctx->release_buffer(avctx, p);
|
|
|
|
if(a->is_mjpeg)
|
|
ff_mjpeg_decode_end(avctx);
|
|
}
|
|
|
|
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
|
|
{
|
|
AVRnContext *a = avctx->priv_data;
|
|
AVFrame *p = &a->frame;
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
int true_height = buf_size / (2*avctx->width);
|
|
int y;
|
|
|
|
if(a->is_mjpeg)
|
|
return ff_mjpeg_decode_frame(avctx, data, data_size, avpkt);
|
|
|
|
if(p->data[0])
|
|
avctx->release_buffer(avctx, p);
|
|
|
|
if(buf_size < 2*avctx->width * avctx->height) {
|
|
av_log(avctx, AV_LOG_ERROR, "packet too small\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if(avctx->get_buffer(avctx, p) < 0){
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
p->pict_type= AV_PICTURE_TYPE_I;
|
|
p->key_frame= 1;
|
|
|
|
if(a->interlace) {
|
|
buf += (true_height - avctx->height)*avctx->width;
|
|
for(y = 0; y < avctx->height-1; y+=2) {
|
|
memcpy(p->data[0] + (y+ a->tff)*p->linesize[0], buf , 2*avctx->width);
|
|
memcpy(p->data[0] + (y+!a->tff)*p->linesize[0], buf + avctx->width*true_height+4, 2*avctx->width);
|
|
buf += 2*avctx->width;
|
|
}
|
|
} else {
|
|
buf += (true_height - avctx->height)*avctx->width*2;
|
|
for(y = 0; y < avctx->height; y++) {
|
|
memcpy(p->data[0] + y*p->linesize[0], buf, 2*avctx->width);
|
|
buf += 2*avctx->width;
|
|
}
|
|
}
|
|
|
|
*(AVFrame*)data = a->frame;
|
|
*data_size = sizeof(AVFrame);
|
|
return buf_size;
|
|
}
|
|
|
|
AVCodec ff_avrn_decoder = {
|
|
.name = "AVRn",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_AVRN,
|
|
.priv_data_size = sizeof(AVRnContext),
|
|
.init = init,
|
|
.close = end,
|
|
.decode = decode_frame,
|
|
.long_name = NULL_IF_CONFIG_SMALL("AVRn"),
|
|
.capabilities = CODEC_CAP_DR1,
|
|
};
|
|
|