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FFmpeg/libavcodec/pnmdec.c

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/*
* 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 "internal.h"
#include "put_bits.h"
#include "pnm.h"
static void samplecpy(uint8_t *dst, const uint8_t *src, int n, int maxval)
{
if (maxval <= 255) {
memcpy(dst, src, n);
} else {
int i;
for (i=0; i<n/2; i++) {
((uint16_t *)dst)[i] = AV_RB16(src+2*i);
}
}
}
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, k, n, linesize, h, upgrade = 0, is_mono = 0;
unsigned char *ptr;
int components, sample_len, ret;
float scale;
s->bytestream_start =
s->bytestream = (uint8_t *)buf;
s->bytestream_end = (uint8_t *)buf + buf_size;
if ((ret = ff_pnm_decode_header(avctx, s)) < 0)
return ret;
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 = av_log2(s->maxval) + 1;
switch (avctx->pix_fmt) {
default:
return AVERROR(EINVAL);
case AV_PIX_FMT_RGBA64:
n = avctx->width * 8;
components=4;
sample_len=16;
if (s->maxval < 65535)
upgrade = 2;
goto do_read;
case AV_PIX_FMT_RGB48:
n = avctx->width * 6;
components=3;
sample_len=16;
if (s->maxval < 65535)
upgrade = 2;
goto do_read;
case AV_PIX_FMT_RGBA:
n = avctx->width * 4;
components=4;
sample_len=8;
goto do_read;
case AV_PIX_FMT_RGB24:
n = avctx->width * 3;
components=3;
sample_len=8;
if (s->maxval < 255)
upgrade = 1;
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_GRAY8A:
n = avctx->width * 2;
components=2;
sample_len=8;
goto do_read;
case AV_PIX_FMT_GRAY16:
n = avctx->width * 2;
components=1;
sample_len=16;
if (s->maxval < 65535)
upgrade = 2;
goto do_read;
case AV_PIX_FMT_YA16:
n = avctx->width * 4;
components=2;
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;
is_mono = 1;
do_read:
ptr = p->data[0];
linesize = p->linesize[0];
if (n * avctx->height > s->bytestream_end - s->bytestream)
return AVERROR_INVALIDDATA;
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;
unsigned 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 AVERROR_INVALIDDATA;
if (is_mono) {
/* read a single digit */
v = (*s->bytestream++)&1;
} else {
/* read a sequence of digits */
for (k = 0; k < 6 && c <= 9; k += 1) {
v = 10*v + c;
c = (*s->bytestream++) - '0';
}
if (v > s->maxval) {
av_log(avctx, AV_LOG_ERROR, "value %d larger than maxval %d\n", v, s->maxval);
return AVERROR_INVALIDDATA;
}
}
if (sample_len == 16) {
((uint16_t*)ptr)[j] = (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval;
} else
put_bits(&pb, sample_len, (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval);
}
if (sample_len != 16)
flush_put_bits(&pb);
ptr+= linesize;
}
}else{
for (i = 0; i < avctx->height; i++) {
if (!upgrade)
samplecpy(ptr, s->bytestream, n, s->maxval);
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_RB16(s->bytestream + 2*j);
((uint16_t *)ptr)[j] = (v * f + 16384) >> 15;
}
}
s->bytestream += n;
ptr += linesize;
}
}
break;
case AV_PIX_FMT_YUV420P:
case AV_PIX_FMT_YUV420P9:
case AV_PIX_FMT_YUV420P10:
{
unsigned char *ptr1, *ptr2;
n = avctx->width;
ptr = p->data[0];
linesize = p->linesize[0];
if (s->maxval >= 256)
n *= 2;
if (n * avctx->height * 3 / 2 > s->bytestream_end - s->bytestream)
return AVERROR_INVALIDDATA;
for (i = 0; i < avctx->height; i++) {
samplecpy(ptr, s->bytestream, n, s->maxval);
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++) {
samplecpy(ptr1, s->bytestream, n, s->maxval);
s->bytestream += n;
samplecpy(ptr2, s->bytestream, n, s->maxval);
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 (n * avctx->height * 3 / 2 > s->bytestream_end - s->bytestream)
return AVERROR_INVALIDDATA;
for (i = 0; i < avctx->height; i++) {
for (j = 0; j < n / 2; j++) {
v = AV_RB16(s->bytestream + 2*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_RB16(s->bytestream + 2*j);
ptr1[j] = (v * f + 16384) >> 15;
}
s->bytestream += n;
for (j = 0; j < n / 2; j++) {
v = AV_RB16(s->bytestream + 2*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_GBRPF32:
if (avctx->width * avctx->height * 12 > s->bytestream_end - s->bytestream)
return AVERROR_INVALIDDATA;
scale = 1.f / s->scale;
if (s->endian) {
float *r, *g, *b;
r = (float *)p->data[2];
g = (float *)p->data[0];
b = (float *)p->data[1];
for (int i = 0; i < avctx->height; i++) {
for (int j = 0; j < avctx->width; j++) {
r[j] = av_int2float(AV_RL32(s->bytestream+0)) * scale;
g[j] = av_int2float(AV_RL32(s->bytestream+4)) * scale;
b[j] = av_int2float(AV_RL32(s->bytestream+8)) * scale;
s->bytestream += 12;
}
r += p->linesize[2] / 4;
g += p->linesize[0] / 4;
b += p->linesize[1] / 4;
}
} else {
float *r, *g, *b;
r = (float *)p->data[2];
g = (float *)p->data[0];
b = (float *)p->data[1];
for (int i = 0; i < avctx->height; i++) {
for (int j = 0; j < avctx->width; j++) {
r[j] = av_int2float(AV_RB32(s->bytestream+0)) * scale;
g[j] = av_int2float(AV_RB32(s->bytestream+4)) * scale;
b[j] = av_int2float(AV_RB32(s->bytestream+8)) * scale;
s->bytestream += 12;
}
r += p->linesize[2] / 4;
g += p->linesize[0] / 4;
b += p->linesize[1] / 4;
}
}
break;
case AV_PIX_FMT_GRAYF32:
if (avctx->width * avctx->height * 4 > s->bytestream_end - s->bytestream)
return AVERROR_INVALIDDATA;
scale = 1.f / s->scale;
if (s->endian) {
float *g = (float *)p->data[0];
for (int i = 0; i < avctx->height; i++) {
for (int j = 0; j < avctx->width; j++) {
g[j] = av_int2float(AV_RL32(s->bytestream)) * scale;
s->bytestream += 4;
}
g += p->linesize[0] / 4;
}
} else {
float *g = (float *)p->data[0];
for (int i = 0; i < avctx->height; i++) {
for (int j = 0; j < avctx->width; j++) {
g[j] = av_int2float(AV_RB32(s->bytestream)) * scale;
s->bytestream += 4;
}
g += p->linesize[0] / 4;
}
}
break;
}
*got_frame = 1;
return s->bytestream - s->bytestream_start;
}
#if CONFIG_PGM_DECODER
const 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
const 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
const 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
const 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
const 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
#if CONFIG_PFM_DECODER
const AVCodec ff_pfm_decoder = {
.name = "pfm",
.long_name = NULL_IF_CONFIG_SMALL("PFM (Portable FloatMap) image"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_PFM,
.priv_data_size = sizeof(PNMContext),
.decode = pnm_decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
};
#endif