mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-11 09:57:54 +02:00
![Michael Niedermayer](/assets/img/avatar_default.png)
* commit 'e50f5d3cf9ef9a16982a5cb4d8b1916cd963aa5b': Alias PIX image encoder and decoder Conflicts: Changelog libavcodec/allcodecs.c libavcodec/version.h libavformat/img2enc.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
129 lines
3.8 KiB
C
129 lines
3.8 KiB
C
/*
|
|
* Alias PIX image decoder
|
|
* Copyright (C) 2014 Vittorio Giovara <vittorio.giovara@gmail.com>
|
|
*
|
|
* 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 "bytestream.h"
|
|
#include "internal.h"
|
|
|
|
#define ALIAS_HEADER_SIZE 10
|
|
|
|
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
|
|
AVPacket *avpkt)
|
|
{
|
|
AVFrame *f = data;
|
|
GetByteContext gb;
|
|
int width, height, ret, bits_pixel, pixel;
|
|
uint8_t *out_buf;
|
|
uint8_t count;
|
|
int x, y;
|
|
|
|
bytestream2_init(&gb, avpkt->data, avpkt->size);
|
|
|
|
if (bytestream2_get_bytes_left(&gb) < ALIAS_HEADER_SIZE) {
|
|
av_log(avctx, AV_LOG_ERROR, "Header too small %d.\n", avpkt->size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
width = bytestream2_get_be16u(&gb);
|
|
height = bytestream2_get_be16u(&gb);
|
|
bytestream2_skipu(&gb, 4); // obsolete X, Y offset
|
|
bits_pixel = bytestream2_get_be16u(&gb);
|
|
|
|
if (bits_pixel == 24)
|
|
avctx->pix_fmt = AV_PIX_FMT_BGR24;
|
|
else if (bits_pixel == 8)
|
|
avctx->pix_fmt = AV_PIX_FMT_GRAY8;
|
|
else {
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid pixel format.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
ret = ff_set_dimensions(avctx, width, height);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = ff_get_buffer(avctx, f, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
f->pict_type = AV_PICTURE_TYPE_I;
|
|
f->key_frame = 1;
|
|
|
|
x = 0;
|
|
y = 1;
|
|
out_buf = f->data[0];
|
|
while (bytestream2_get_bytes_left(&gb) > 0) {
|
|
int i;
|
|
|
|
/* set buffer at the right position at every new line */
|
|
if (x == avctx->width) {
|
|
x = 0;
|
|
out_buf = f->data[0] + f->linesize[0] * y++;
|
|
if (y > avctx->height) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"Ended frame decoding with %d bytes left.\n",
|
|
bytestream2_get_bytes_left(&gb));
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
|
|
/* read packet and copy data */
|
|
count = bytestream2_get_byteu(&gb);
|
|
if (!count || x + count > avctx->width) {
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid run length %d.\n", count);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
|
|
pixel = bytestream2_get_be24(&gb);
|
|
for (i = 0; i < count; i++) {
|
|
AV_WB24(out_buf, pixel);
|
|
out_buf += 3;
|
|
}
|
|
} else { // AV_PIX_FMT_GRAY8
|
|
pixel = bytestream2_get_byte(&gb);
|
|
for (i = 0; i < count; i++)
|
|
*out_buf++ = pixel;
|
|
}
|
|
|
|
x += i;
|
|
}
|
|
|
|
if (x != width || y != height) {
|
|
av_log(avctx, AV_LOG_ERROR, "Picture stopped at %d,%d.\n", x, y);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
*got_frame = 1;
|
|
return avpkt->size;
|
|
}
|
|
|
|
AVCodec ff_alias_pix_decoder = {
|
|
.name = "alias_pix",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_ALIAS_PIX,
|
|
.decode = decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
};
|