mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
def97856de
Express bitfields more simply. Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
289 lines
9.4 KiB
C
289 lines
9.4 KiB
C
/*
|
|
* PNM image format
|
|
* Copyright (c) 2002, 2003 Fabrice Bellard
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "bytestream.h"
|
|
#include "internal.h"
|
|
#include "put_bits.h"
|
|
#include "pnm.h"
|
|
|
|
|
|
static int pnm_decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
PNMContext * const s = avctx->priv_data;
|
|
AVFrame * const p = data;
|
|
int i, j, n, linesize, h, upgrade = 0;
|
|
unsigned char *ptr;
|
|
int components, sample_len, ret;
|
|
|
|
s->bytestream_start =
|
|
s->bytestream = buf;
|
|
s->bytestream_end = buf + buf_size;
|
|
|
|
if ((ret = ff_pnm_decode_header(avctx, s)) < 0)
|
|
return ret;
|
|
|
|
if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return ret;
|
|
}
|
|
p->pict_type = AV_PICTURE_TYPE_I;
|
|
p->key_frame = 1;
|
|
|
|
switch (avctx->pix_fmt) {
|
|
default:
|
|
return AVERROR(EINVAL);
|
|
case AV_PIX_FMT_RGB48BE:
|
|
n = avctx->width * 6;
|
|
components=3;
|
|
sample_len=16;
|
|
goto do_read;
|
|
case AV_PIX_FMT_RGB24:
|
|
n = avctx->width * 3;
|
|
components=3;
|
|
sample_len=8;
|
|
goto do_read;
|
|
case AV_PIX_FMT_GRAY8:
|
|
n = avctx->width;
|
|
components=1;
|
|
sample_len=8;
|
|
if (s->maxval < 255)
|
|
upgrade = 1;
|
|
goto do_read;
|
|
case AV_PIX_FMT_GRAY16BE:
|
|
case AV_PIX_FMT_GRAY16LE:
|
|
n = avctx->width * 2;
|
|
components=1;
|
|
sample_len=16;
|
|
if (s->maxval < 65535)
|
|
upgrade = 2;
|
|
goto do_read;
|
|
case AV_PIX_FMT_MONOWHITE:
|
|
case AV_PIX_FMT_MONOBLACK:
|
|
n = (avctx->width + 7) >> 3;
|
|
components=1;
|
|
sample_len=1;
|
|
do_read:
|
|
ptr = p->data[0];
|
|
linesize = p->linesize[0];
|
|
if (s->bytestream + n * avctx->height > s->bytestream_end)
|
|
return AVERROR_INVALIDDATA;
|
|
if(s->type < 4){
|
|
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;
|
|
while(s->bytestream < s->bytestream_end && (*s->bytestream < '0' || *s->bytestream > '9' ))
|
|
s->bytestream++;
|
|
if(s->bytestream >= s->bytestream_end)
|
|
return AVERROR_INVALIDDATA;
|
|
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 AV_PIX_FMT_YUV420P:
|
|
case AV_PIX_FMT_YUV420P9BE:
|
|
case AV_PIX_FMT_YUV420P10BE:
|
|
{
|
|
unsigned char *ptr1, *ptr2;
|
|
|
|
n = avctx->width;
|
|
ptr = p->data[0];
|
|
linesize = p->linesize[0];
|
|
if (s->maxval >= 256)
|
|
n *= 2;
|
|
if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end)
|
|
return AVERROR_INVALIDDATA;
|
|
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;
|
|
case AV_PIX_FMT_YUV420P16:
|
|
{
|
|
uint16_t *ptr1, *ptr2;
|
|
const int f = (65535 * 32768 + s->maxval / 2) / s->maxval;
|
|
unsigned int j, v;
|
|
|
|
n = avctx->width * 2;
|
|
ptr = p->data[0];
|
|
linesize = p->linesize[0];
|
|
if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end)
|
|
return AVERROR_INVALIDDATA;
|
|
for (i = 0; i < avctx->height; i++) {
|
|
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;
|
|
}
|
|
ptr1 = (uint16_t*)p->data[1];
|
|
ptr2 = (uint16_t*)p->data[2];
|
|
n >>= 1;
|
|
h = avctx->height >> 1;
|
|
for (i = 0; i < h; i++) {
|
|
for (j = 0; j < n / 2; j++) {
|
|
v = av_be2ne16(((uint16_t *)s->bytestream)[j]);
|
|
ptr1[j] = (v * f + 16384) >> 15;
|
|
}
|
|
s->bytestream += n;
|
|
|
|
for (j = 0; j < n / 2; j++) {
|
|
v = av_be2ne16(((uint16_t *)s->bytestream)[j]);
|
|
ptr2[j] = (v * f + 16384) >> 15;
|
|
}
|
|
s->bytestream += n;
|
|
|
|
ptr1 += p->linesize[1] / 2;
|
|
ptr2 += p->linesize[2] / 2;
|
|
}
|
|
}
|
|
break;
|
|
case AV_PIX_FMT_RGB32:
|
|
ptr = p->data[0];
|
|
linesize = p->linesize[0];
|
|
if (s->bytestream + avctx->width * avctx->height * 4 > s->bytestream_end)
|
|
return AVERROR_INVALIDDATA;
|
|
for (i = 0; i < avctx->height; i++) {
|
|
int j, r, g, b, a;
|
|
|
|
for (j = 0; j < avctx->width; j++) {
|
|
r = *s->bytestream++;
|
|
g = *s->bytestream++;
|
|
b = *s->bytestream++;
|
|
a = *s->bytestream++;
|
|
((uint32_t *)ptr)[j] = (a << 24) | (r << 16) | (g << 8) | b;
|
|
}
|
|
ptr += linesize;
|
|
}
|
|
break;
|
|
}
|
|
*got_frame = 1;
|
|
|
|
return s->bytestream - s->bytestream_start;
|
|
}
|
|
|
|
|
|
#if CONFIG_PGM_DECODER
|
|
AVCodec ff_pgm_decoder = {
|
|
.name = "pgm",
|
|
.long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_PGM,
|
|
.priv_data_size = sizeof(PNMContext),
|
|
.decode = pnm_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|
|
#endif
|
|
|
|
#if CONFIG_PGMYUV_DECODER
|
|
AVCodec ff_pgmyuv_decoder = {
|
|
.name = "pgmyuv",
|
|
.long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_PGMYUV,
|
|
.priv_data_size = sizeof(PNMContext),
|
|
.decode = pnm_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|
|
#endif
|
|
|
|
#if CONFIG_PPM_DECODER
|
|
AVCodec ff_ppm_decoder = {
|
|
.name = "ppm",
|
|
.long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_PPM,
|
|
.priv_data_size = sizeof(PNMContext),
|
|
.decode = pnm_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|
|
#endif
|
|
|
|
#if CONFIG_PBM_DECODER
|
|
AVCodec ff_pbm_decoder = {
|
|
.name = "pbm",
|
|
.long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_PBM,
|
|
.priv_data_size = sizeof(PNMContext),
|
|
.decode = pnm_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|
|
#endif
|
|
|
|
#if CONFIG_PAM_DECODER
|
|
AVCodec ff_pam_decoder = {
|
|
.name = "pam",
|
|
.long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_PAM,
|
|
.priv_data_size = sizeof(PNMContext),
|
|
.decode = pnm_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|
|
#endif
|