mirror of https://git.ffmpeg.org/ffmpeg.git
208 lines
6.4 KiB
C
208 lines
6.4 KiB
C
/*
|
|
* PNM image format
|
|
* Copyright (c) 2002, 2003 Fabrice Bellard
|
|
*
|
|
* 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 <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "libavutil/imgutils.h"
|
|
#include "avcodec.h"
|
|
#include "pnm.h"
|
|
|
|
static inline int pnm_space(int c)
|
|
{
|
|
return c == ' ' || c == '\n' || c == '\r' || c == '\t';
|
|
}
|
|
|
|
static void pnm_get(PNMContext *sc, char *str, int buf_size)
|
|
{
|
|
char *s;
|
|
int c;
|
|
|
|
/* skip spaces and comments */
|
|
while (sc->bytestream < sc->bytestream_end) {
|
|
c = *sc->bytestream++;
|
|
if (c == '#') {
|
|
while (c != '\n' && sc->bytestream < sc->bytestream_end) {
|
|
c = *sc->bytestream++;
|
|
}
|
|
} else if (!pnm_space(c)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
s = str;
|
|
while (sc->bytestream < sc->bytestream_end && !pnm_space(c)) {
|
|
if ((s - str) < buf_size - 1)
|
|
*s++ = c;
|
|
c = *sc->bytestream++;
|
|
}
|
|
*s = '\0';
|
|
}
|
|
|
|
int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s)
|
|
{
|
|
char buf1[32], tuple_type[32];
|
|
int h, w, depth, maxval;
|
|
|
|
pnm_get(s, buf1, sizeof(buf1));
|
|
s->type= buf1[1]-'0';
|
|
if(buf1[0] != 'P')
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (s->type==1 || s->type==4) {
|
|
avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
|
|
} else if (s->type==2 || s->type==5) {
|
|
if (avctx->codec_id == AV_CODEC_ID_PGMYUV)
|
|
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
|
|
else
|
|
avctx->pix_fmt = AV_PIX_FMT_GRAY8;
|
|
} else if (s->type==3 || s->type==6) {
|
|
avctx->pix_fmt = AV_PIX_FMT_RGB24;
|
|
} else if (s->type==7) {
|
|
w = -1;
|
|
h = -1;
|
|
maxval = -1;
|
|
depth = -1;
|
|
tuple_type[0] = '\0';
|
|
for (;;) {
|
|
pnm_get(s, buf1, sizeof(buf1));
|
|
if (!strcmp(buf1, "WIDTH")) {
|
|
pnm_get(s, buf1, sizeof(buf1));
|
|
w = strtol(buf1, NULL, 10);
|
|
} else if (!strcmp(buf1, "HEIGHT")) {
|
|
pnm_get(s, buf1, sizeof(buf1));
|
|
h = strtol(buf1, NULL, 10);
|
|
} else if (!strcmp(buf1, "DEPTH")) {
|
|
pnm_get(s, buf1, sizeof(buf1));
|
|
depth = strtol(buf1, NULL, 10);
|
|
} else if (!strcmp(buf1, "MAXVAL")) {
|
|
pnm_get(s, buf1, sizeof(buf1));
|
|
maxval = strtol(buf1, NULL, 10);
|
|
} else if (!strcmp(buf1, "TUPLTYPE") ||
|
|
/* libavcodec used to write invalid files */
|
|
!strcmp(buf1, "TUPLETYPE")) {
|
|
pnm_get(s, tuple_type, sizeof(tuple_type));
|
|
} else if (!strcmp(buf1, "ENDHDR")) {
|
|
break;
|
|
} else {
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
/* check that all tags are present */
|
|
if (w <= 0 || h <= 0 || maxval <= 0 || depth <= 0 || tuple_type[0] == '\0' || av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
avctx->width = w;
|
|
avctx->height = h;
|
|
s->maxval = maxval;
|
|
if (depth == 1) {
|
|
if (maxval == 1) {
|
|
avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
|
|
} else if (maxval == 255) {
|
|
avctx->pix_fmt = AV_PIX_FMT_GRAY8;
|
|
} else {
|
|
avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
|
|
}
|
|
} else if (depth == 2) {
|
|
if (maxval == 255)
|
|
avctx->pix_fmt = AV_PIX_FMT_GRAY8A;
|
|
} else if (depth == 3) {
|
|
if (maxval < 256) {
|
|
avctx->pix_fmt = AV_PIX_FMT_RGB24;
|
|
} else {
|
|
avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
|
|
}
|
|
} else if (depth == 4) {
|
|
if (maxval < 256) {
|
|
avctx->pix_fmt = AV_PIX_FMT_RGBA;
|
|
} else {
|
|
avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
|
|
}
|
|
} else {
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
return 0;
|
|
} else {
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
pnm_get(s, buf1, sizeof(buf1));
|
|
w = atoi(buf1);
|
|
pnm_get(s, buf1, sizeof(buf1));
|
|
h = atoi(buf1);
|
|
if(w <= 0 || h <= 0 || av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
avctx->width = w;
|
|
avctx->height = h;
|
|
|
|
if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE && avctx->pix_fmt != AV_PIX_FMT_MONOBLACK) {
|
|
pnm_get(s, buf1, sizeof(buf1));
|
|
s->maxval = atoi(buf1);
|
|
if (s->maxval <= 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid maxval: %d\n", s->maxval);
|
|
s->maxval = 255;
|
|
}
|
|
if (s->maxval >= 256) {
|
|
if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
|
|
avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
|
|
} else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
|
|
avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
|
|
} else {
|
|
av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format\n");
|
|
avctx->pix_fmt = AV_PIX_FMT_NONE;
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
}else
|
|
s->maxval=1;
|
|
/* more check if YUV420 */
|
|
if (avctx->pix_fmt == AV_PIX_FMT_YUV420P) {
|
|
if ((avctx->width & 1) != 0)
|
|
return AVERROR_INVALIDDATA;
|
|
h = (avctx->height * 2);
|
|
if ((h % 3) != 0)
|
|
return AVERROR_INVALIDDATA;
|
|
h /= 3;
|
|
avctx->height = h;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
av_cold int ff_pnm_end(AVCodecContext *avctx)
|
|
{
|
|
PNMContext *s = avctx->priv_data;
|
|
|
|
if (s->picture.data[0])
|
|
avctx->release_buffer(avctx, &s->picture);
|
|
|
|
return 0;
|
|
}
|
|
|
|
av_cold int ff_pnm_init(AVCodecContext *avctx)
|
|
{
|
|
PNMContext *s = avctx->priv_data;
|
|
|
|
avcodec_get_frame_defaults(&s->picture);
|
|
avctx->coded_frame = &s->picture;
|
|
|
|
return 0;
|
|
}
|