mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-04 07:21:31 +02:00
![Andreas Rheinhardt](/assets/img/avatar_default.png)
Given that the AVCodec.next pointer has now been removed, most of the AVCodecs are not modified at all any more and can therefore be made const (as this patch does); the only exceptions are the very few codecs for external libraries that have a init_static_data callback. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
169 lines
5.9 KiB
C
169 lines
5.9 KiB
C
/*
|
|
* PGX image format
|
|
* Copyright (c) 2020 Gautam Ramakrishnan
|
|
*
|
|
* 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 "bytestream.h"
|
|
#include "libavutil/imgutils.h"
|
|
|
|
static int pgx_get_number(AVCodecContext *avctx, GetByteContext *g, int *number) {
|
|
int ret = AVERROR_INVALIDDATA;
|
|
char digit;
|
|
|
|
*number = 0;
|
|
while (1) {
|
|
uint64_t temp;
|
|
if (!bytestream2_get_bytes_left(g))
|
|
return AVERROR_INVALIDDATA;
|
|
digit = bytestream2_get_byte(g);
|
|
if (digit == ' ' || digit == 0xA || digit == 0xD)
|
|
break;
|
|
else if (digit < '0' || digit > '9')
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
temp = (uint64_t)10 * (*number) + (digit - '0');
|
|
if (temp > INT_MAX)
|
|
return AVERROR_INVALIDDATA;
|
|
*number = temp;
|
|
ret = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int pgx_decode_header(AVCodecContext *avctx, GetByteContext *g,
|
|
int *depth, int *width, int *height,
|
|
int *sign)
|
|
{
|
|
int byte;
|
|
|
|
if (bytestream2_get_bytes_left(g) < 6) {
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
bytestream2_skip(g, 6);
|
|
|
|
// Is the component signed?
|
|
byte = bytestream2_peek_byte(g);
|
|
if (byte == '+') {
|
|
*sign = 0;
|
|
bytestream2_skip(g, 1);
|
|
} else if (byte == '-') {
|
|
*sign = 1;
|
|
bytestream2_skip(g, 1);
|
|
} else if (byte == 0)
|
|
goto error;
|
|
|
|
byte = bytestream2_peek_byte(g);
|
|
if (byte == ' ')
|
|
bytestream2_skip(g, 1);
|
|
else if (byte == 0)
|
|
goto error;
|
|
|
|
if (pgx_get_number(avctx, g, depth))
|
|
goto error;
|
|
if (pgx_get_number(avctx, g, width))
|
|
goto error;
|
|
if (pgx_get_number(avctx, g, height))
|
|
goto error;
|
|
|
|
if (bytestream2_peek_byte(g) == 0xA)
|
|
bytestream2_skip(g, 1);
|
|
return 0;
|
|
|
|
error:
|
|
av_log(avctx, AV_LOG_ERROR, "Error in decoding header.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
#define WRITE_FRAME(D, PIXEL, suffix) \
|
|
static inline void write_frame_ ##D(AVFrame *frame, GetByteContext *g, \
|
|
int width, int height, int sign, int depth) \
|
|
{ \
|
|
int i, j; \
|
|
for (i = 0; i < height; i++) { \
|
|
PIXEL *line = (PIXEL*)frame->data[0] + i*frame->linesize[0]/sizeof(PIXEL); \
|
|
for (j = 0; j < width; j++) { \
|
|
unsigned val; \
|
|
if (sign) \
|
|
val = (PIXEL)bytestream2_get_ ##suffix(g) + (1 << (depth - 1)); \
|
|
else \
|
|
val = bytestream2_get_ ##suffix(g); \
|
|
val <<= (D - depth); \
|
|
*(line + j) = val; \
|
|
} \
|
|
} \
|
|
} \
|
|
|
|
WRITE_FRAME(8, int8_t, byte)
|
|
WRITE_FRAME(16, int16_t, be16)
|
|
|
|
static int pgx_decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
AVFrame *p = data;
|
|
int ret;
|
|
int bpp;
|
|
int width, height, depth;
|
|
int sign = 0;
|
|
GetByteContext g;
|
|
bytestream2_init(&g, avpkt->data, avpkt->size);
|
|
|
|
if ((ret = pgx_decode_header(avctx, &g, &depth, &width, &height, &sign)) < 0)
|
|
return ret;
|
|
|
|
if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
|
|
return ret;
|
|
|
|
if (depth > 0 && depth <= 8) {
|
|
avctx->pix_fmt = AV_PIX_FMT_GRAY8;
|
|
bpp = 8;
|
|
} else if (depth > 0 && depth <= 16) {
|
|
avctx->pix_fmt = AV_PIX_FMT_GRAY16;
|
|
bpp = 16;
|
|
} else {
|
|
av_log(avctx, AV_LOG_ERROR, "depth %d is invalid or unsupported.\n", depth);
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
if (bytestream2_get_bytes_left(&g) < width * height * (bpp >> 3))
|
|
return AVERROR_INVALIDDATA;
|
|
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
|
|
return ret;
|
|
p->pict_type = AV_PICTURE_TYPE_I;
|
|
p->key_frame = 1;
|
|
avctx->bits_per_raw_sample = depth;
|
|
if (bpp == 8)
|
|
write_frame_8(p, &g, width, height, sign, depth);
|
|
else if (bpp == 16)
|
|
write_frame_16(p, &g, width, height, sign, depth);
|
|
*got_frame = 1;
|
|
return 0;
|
|
}
|
|
|
|
const AVCodec ff_pgx_decoder = {
|
|
.name = "pgx",
|
|
.long_name = NULL_IF_CONFIG_SMALL("PGX (JPEG2000 Test Format)"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_PGX,
|
|
.decode = pgx_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|