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avformat: add ff_reshuffle_raw_rgb() 

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-02-17 14:02:19 +01:00
parent da94d619f6
commit 090b673aba
2 changed files with 74 additions and 0 deletions
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8
libavformat/internal.h
View File

@ -560,4 +560,12 @@ void ff_format_io_close(AVFormatContext *s, AVIOContext **pb);
*/
int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds);
/**
* Reshuffles the lines to use the user specified stride.
*
* @param ppkt input and output packet
* @return negative error code or 0 or 1, 1 indicates that ppkt needs to be freed
*/
int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecContext *enc, int expected_stride);
#endif /* AVFORMAT_INTERNAL_H */

66
libavformat/rawutils.c Normal file
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@ -0,0 +1,66 @@
/*
* Raw video utils
* 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 "avformat.h"
#include "internal.h"
int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecContext *enc, int expected_stride)
{
int ret;
AVPacket *pkt = *ppkt;
int64_t bpc = enc->bits_per_coded_sample != 15 ? enc->bits_per_coded_sample : 16;
int min_stride = (enc->width * bpc + 7) >> 3;
int with_pal_size = min_stride * enc->height + 1024;
int size = bpc == 8 && pkt->size == with_pal_size ? min_stride * enc->height : pkt->size;
int stride = size / enc->height;
int padding = expected_stride - FFMIN(expected_stride, stride);
int y;
AVPacket *new_pkt;
if (pkt->size == expected_stride * enc->height)
return 0;
if (size != stride * enc->height)
return 0;
new_pkt = av_packet_alloc();
if (!new_pkt)
return AVERROR(ENOMEM);
ret = av_new_packet(new_pkt, expected_stride * enc->height);
if (ret < 0)
goto fail;
ret = av_packet_copy_props(new_pkt, pkt);
if (ret < 0)
goto fail;
for (y = 0; y<enc->height; y++) {
memcpy(new_pkt->data + y*expected_stride, pkt->data + y*stride, FFMIN(expected_stride, stride));
memset(new_pkt->data + y*expected_stride + expected_stride - padding, 0, padding);
}
*ppkt = new_pkt;
return 1;
fail:
av_packet_free(&new_pkt);
return ret;
}