Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

263 lines (246 sloc) 8.406 kb
/*
* 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 "avcodec.h"
#include "put_bits.h"
#include "pnm.h"
static int pnm_decode_frame(AVCodecContext *avctx, void *data,
int *data_size, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
PNMContext * const s = avctx->priv_data;
AVFrame *picture = data;
AVFrame * const p = &s->picture;
int i, j, n, linesize, h, upgrade = 0, is_mono = 0;
unsigned char *ptr;
int components, sample_len;
s->bytestream_start =
s->bytestream = (uint8_t *)buf;
s->bytestream_end = (uint8_t *)buf + buf_size;
if (ff_pnm_decode_header(avctx, s) < 0)
return -1;
if (p->data[0])
avctx->release_buffer(avctx, p);
p->reference = 0;
if (avctx->get_buffer(avctx, p) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
p->pict_type = AV_PICTURE_TYPE_I;
p->key_frame = 1;
switch (avctx->pix_fmt) {
default:
return -1;
case PIX_FMT_RGBA64BE:
n = avctx->width * 8;
components=4;
sample_len=16;
goto do_read;
case PIX_FMT_RGB48BE:
n = avctx->width * 6;
components=3;
sample_len=16;
goto do_read;
case PIX_FMT_RGBA:
n = avctx->width * 4;
components=4;
sample_len=8;
goto do_read;
case PIX_FMT_RGB24:
n = avctx->width * 3;
components=3;
sample_len=8;
goto do_read;
case PIX_FMT_GRAY8:
n = avctx->width;
components=1;
sample_len=8;
if (s->maxval < 255)
upgrade = 1;
goto do_read;
case PIX_FMT_GRAY8A:
n = avctx->width * 2;
components=2;
sample_len=8;
goto do_read;
case PIX_FMT_GRAY16BE:
case PIX_FMT_GRAY16LE:
n = avctx->width * 2;
components=1;
sample_len=16;
if (s->maxval < 65535)
upgrade = 2;
goto do_read;
case PIX_FMT_MONOWHITE:
case PIX_FMT_MONOBLACK:
n = (avctx->width + 7) >> 3;
components=1;
sample_len=1;
is_mono = 1;
do_read:
ptr = p->data[0];
linesize = p->linesize[0];
if (s->bytestream + n * avctx->height > s->bytestream_end)
return -1;
if(s->type < 4 || (is_mono && s->type==7)){
for (i=0; i<avctx->height; i++) {
PutBitContext pb;
init_put_bits(&pb, ptr, linesize);
for(j=0; j<avctx->width * components; j++){
unsigned int c=0;
int v=0;
if(s->type < 4)
while(s->bytestream < s->bytestream_end && (*s->bytestream < '0' || *s->bytestream > '9' ))
s->bytestream++;
if(s->bytestream >= s->bytestream_end)
return -1;
if (is_mono) {
/* read a single digit */
v = (*s->bytestream++)&1;
} else {
/* read a sequence of digits */
do {
v = 10*v + c;
c = (*s->bytestream++) - '0';
} while (c <= 9);
}
put_bits(&pb, sample_len, (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval);
}
flush_put_bits(&pb);
ptr+= linesize;
}
}else{
for (i = 0; i < avctx->height; i++) {
if (!upgrade)
memcpy(ptr, s->bytestream, n);
else if (upgrade == 1) {
unsigned int j, f = (255 * 128 + s->maxval / 2) / s->maxval;
for (j = 0; j < n; j++)
ptr[j] = (s->bytestream[j] * f + 64) >> 7;
} else if (upgrade == 2) {
unsigned int j, v, f = (65535 * 32768 + s->maxval / 2) / s->maxval;
for (j = 0; j < n / 2; j++) {
v = av_be2ne16(((uint16_t *)s->bytestream)[j]);
((uint16_t *)ptr)[j] = (v * f + 16384) >> 15;
}
}
s->bytestream += n;
ptr += linesize;
}
}
break;
case PIX_FMT_YUV420P:
{
unsigned char *ptr1, *ptr2;
n = avctx->width;
ptr = p->data[0];
linesize = p->linesize[0];
if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end)
return -1;
for (i = 0; i < avctx->height; i++) {
memcpy(ptr, s->bytestream, n);
s->bytestream += n;
ptr += linesize;
}
ptr1 = p->data[1];
ptr2 = p->data[2];
n >>= 1;
h = avctx->height >> 1;
for (i = 0; i < h; i++) {
memcpy(ptr1, s->bytestream, n);
s->bytestream += n;
memcpy(ptr2, s->bytestream, n);
s->bytestream += n;
ptr1 += p->linesize[1];
ptr2 += p->linesize[2];
}
}
break;
}
*picture = s->picture;
*data_size = sizeof(AVPicture);
return s->bytestream - s->bytestream_start;
}
#if CONFIG_PGM_DECODER
AVCodec ff_pgm_decoder = {
.name = "pgm",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_PGM,
.priv_data_size = sizeof(PNMContext),
.init = ff_pnm_init,
.close = ff_pnm_end,
.decode = pnm_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
};
#endif
#if CONFIG_PGMYUV_DECODER
AVCodec ff_pgmyuv_decoder = {
.name = "pgmyuv",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_PGMYUV,
.priv_data_size = sizeof(PNMContext),
.init = ff_pnm_init,
.close = ff_pnm_end,
.decode = pnm_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
};
#endif
#if CONFIG_PPM_DECODER
AVCodec ff_ppm_decoder = {
.name = "ppm",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_PPM,
.priv_data_size = sizeof(PNMContext),
.init = ff_pnm_init,
.close = ff_pnm_end,
.decode = pnm_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
};
#endif
#if CONFIG_PBM_DECODER
AVCodec ff_pbm_decoder = {
.name = "pbm",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_PBM,
.priv_data_size = sizeof(PNMContext),
.init = ff_pnm_init,
.close = ff_pnm_end,
.decode = pnm_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
};
#endif
#if CONFIG_PAM_DECODER
AVCodec ff_pam_decoder = {
.name = "pam",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_PAM,
.priv_data_size = sizeof(PNMContext),
.init = ff_pnm_init,
.close = ff_pnm_end,
.decode = pnm_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
};
#endif
Jump to Line
Something went wrong with that request. Please try again.