0,0 → 1,131 |
/* |
* 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 "internal.h" |
#include "mjpeg.h" |
#include "mjpegdec.h" |
#include "libavutil/imgutils.h" |
|
typedef struct { |
MJpegDecodeContext mjpeg_ctx; |
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; |
int ret; |
|
// 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 && avctx->lowres) { |
av_log(avctx, AV_LOG_ERROR, "lowres is not possible with rawvideo\n"); |
return AVERROR(EINVAL); |
} |
|
if(a->is_mjpeg) |
return ff_mjpeg_decode_init(avctx); |
|
if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0) |
return ret; |
|
avctx->pix_fmt = AV_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; |
} |
} |
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return 0; |
} |
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static av_cold int end(AVCodecContext *avctx) |
{ |
AVRnContext *a = avctx->priv_data; |
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if(a->is_mjpeg) |
ff_mjpeg_decode_end(avctx); |
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return 0; |
} |
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static int decode_frame(AVCodecContext *avctx, void *data, |
int *got_frame, AVPacket *avpkt) |
{ |
AVRnContext *a = avctx->priv_data; |
AVFrame *p = data; |
const uint8_t *buf = avpkt->data; |
int buf_size = avpkt->size; |
int y, ret, true_height; |
|
if(a->is_mjpeg) |
return ff_mjpeg_decode_frame(avctx, data, got_frame, avpkt); |
|
true_height = buf_size / (2*avctx->width); |
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if(buf_size < 2*avctx->width * avctx->height) { |
av_log(avctx, AV_LOG_ERROR, "packet too small\n"); |
return AVERROR_INVALIDDATA; |
} |
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
return ret; |
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; |
} |
} |
|
*got_frame = 1; |
return buf_size; |
} |
|
AVCodec ff_avrn_decoder = { |
.name = "avrn", |
.long_name = NULL_IF_CONFIG_SMALL("Avid AVI Codec"), |
.type = AVMEDIA_TYPE_VIDEO, |
.id = AV_CODEC_ID_AVRN, |
.priv_data_size = sizeof(AVRnContext), |
.init = init, |
.close = end, |
.decode = decode_frame, |
.capabilities = CODEC_CAP_DR1, |
.max_lowres = 3, |
}; |