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FFmpeg/libavcodec/photocd.c
Andreas Rheinhardt 38ee8f80ea avcodec/photocd: Remove set-but-unused variables 
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-09-04 22:05:31 +02:00

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/*
* Kodak PhotoCD (a.k.a. ImagePac) image decoder
*
* Copyright (c) 1996-2002 Gerd Knorr
* Copyright (c) 2010 Kenneth Vermeirsch
* Copyright (c) 2020 Paul B Mahol
*
* 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
*/
/**
* @file
* Kodak PhotoCD (a.k.a. ImagePac) image decoder
*
* Supports resolutions up to 3072x2048.
*/
#define CACHED_BITSTREAM_READER !ARCH_X86_32
#include "libavutil/avassert.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "bytestream.h"
#include "get_bits.h"
#include "internal.h"
#include "thread.h"
typedef struct PhotoCDContext {
AVClass *class;
int lowres;
GetByteContext gb;
int thumbnails; //* number of thumbnails; 0 for normal image */
int resolution;
int orientation;
int streampos;
uint8_t bits[256];
uint16_t codes[256];
uint8_t syms[256];
VLC vlc[3];
} PhotoCDContext;
typedef struct ImageInfo {
uint32_t start;
uint16_t width, height;
} ImageInfo;
static const ImageInfo img_info[6] = {
{8192, 192, 128},
{47104, 384, 256},
{196608, 768, 512},
{0, 1536, 1024},
{0, 3072, 2048},
{0, 6144, 4096},
};
static av_noinline void interp_lowres(PhotoCDContext *s, AVFrame *picture,
int width, int height)
{
GetByteContext *gb = &s->gb;
int start = s->streampos + img_info[2].start;
uint8_t *ptr, *ptr1, *ptr2;
uint8_t *dst;
int fill;
ptr = picture->data[0];
ptr1 = picture->data[1];
ptr2 = picture->data[2];
bytestream2_seek(gb, start, SEEK_SET);
for (int y = 0; y < height; y += 2) {
dst = ptr;
for (int x = 0; x < width - 1; x++) {
fill = bytestream2_get_byte(gb);
*(dst++) = fill;
*(dst++) = (fill + bytestream2_peek_byte(gb) + 1) >> 1;
}
fill = bytestream2_get_byte(gb);
*(dst++) = fill;
*(dst++) = fill;
ptr += picture->linesize[0] << 1;
dst = ptr;
for (int x = 0; x < width - 1; x++) {
fill = bytestream2_get_byte(gb);
*(dst++) = fill;
*(dst++) = (fill + bytestream2_peek_byte(gb) + 1) >> 1;
}
fill = bytestream2_get_byte(gb);
*(dst++) = fill;
*(dst++) = fill;
ptr += picture->linesize[0] << 1;
dst = ptr1;
for (int x = 0; x < (width >> 1) - 1; x++) {
fill = bytestream2_get_byte(gb);
*(dst++) = fill;
*(dst++) = (fill + bytestream2_peek_byte(gb) + 1) >> 1;
}
fill = bytestream2_get_byte(gb);
*(dst++) = fill;
*(dst++) = fill;
ptr1 += picture->linesize[1] << 1;
dst = ptr2;
for (int x = 0; x < (width >> 1) - 1; x++) {
fill = bytestream2_get_byte(gb);
*(dst++) = fill;
*(dst++) = (fill + bytestream2_peek_byte(gb) + 1) >> 1;
}
fill = bytestream2_get_byte(gb);
*(dst++) = fill;
*(dst++) = fill;
ptr2 += picture->linesize[2] << 1;
}
s->streampos += bytestream2_tell(gb) - start;
}
static av_noinline void interp_lines(uint8_t *ptr, int linesize,
int width, int height)
{
const uint8_t *src1;
uint8_t *dst;
int x;
for (int y = 0; y < height - 2; y += 2) {
const uint8_t *src1 = ptr;
uint8_t *dst = ptr + linesize;
const uint8_t *src2 = dst + linesize;
for (x = 0; x < width - 2; x += 2) {
dst[x] = (src1[x] + src2[x] + 1) >> 1;
dst[x + 1] = (src1[x] + src2[x] + src1[x + 2] + src2[x + 2] + 2) >> 2;
}
dst[x] = dst[x + 1] = (src1[x] + src2[x] + 1) >> 1;
ptr += linesize << 1;
}
src1 = ptr;
dst = ptr + linesize;
for (x = 0; x < width - 2; x += 2) {
dst[x] = src1[x];
dst[x + 1] = (src1[x] + src1[x + 2] + 1) >> 1;
}
dst[x] = dst[x + 1] = src1[x];
}
static av_noinline void interp_pixels(uint8_t *ptr, int linesize,
int width, int height)
{
for (int y = height - 2; y >= 0; y -= 2) {
const uint8_t *src = ptr + (y >> 1) * linesize;
uint8_t *dst = ptr + y * linesize;
dst[width - 2] = dst[width - 1] = src[(width >> 1) - 1];
for (int x = width - 4; x >= 0; x -= 2) {
dst[x] = src[x >> 1];
dst[x + 1] = (src[x >> 1] + src[(x >> 1) + 1] + 1) >> 1;
}
}
}
static av_noinline int read_hufftable(AVCodecContext *avctx, VLC *vlc)
{
PhotoCDContext *s = avctx->priv_data;
GetByteContext *gb = &s->gb;
int start = s->streampos;
int count, ret;
bytestream2_seek(gb, start, SEEK_SET);
count = bytestream2_get_byte(gb) + 1;
if (bytestream2_get_bytes_left(gb) < count * 4)
return AVERROR_INVALIDDATA;
for (int j = 0; j < count; j++) {
const int bit = bytestream2_get_byteu(gb) + 1;
const int code = bytestream2_get_be16u(gb);
const int sym = bytestream2_get_byteu(gb);
if (bit > 16)
return AVERROR_INVALIDDATA;
s->bits[j] = bit;
s->codes[j] = code >> (16 - bit);
s->syms[j] = sym;
}
ff_free_vlc(vlc);
ret = ff_init_vlc_sparse(vlc, 12, count,
s->bits, sizeof(*s->bits), sizeof(*s->bits),
s->codes, sizeof(*s->codes), sizeof(*s->codes),
s->syms, sizeof(*s->syms), sizeof(*s->syms), 0);
s->streampos = bytestream2_tell(gb);
return ret;
}
static av_noinline int decode_huff(AVCodecContext *avctx, AVFrame *frame,
int target_res, int curr_res)
{
PhotoCDContext *s = avctx->priv_data;
GetBitContext g;
GetByteContext *gb = &s->gb;
int ret, y = 0, type, height;
int start = s->streampos;
unsigned shiftreg;
const int scaling = target_res - curr_res;
const uint8_t type2idx[] = { 0, 0xff, 1, 2 };
bytestream2_seek(gb, start, SEEK_SET);
ret = init_get_bits8(&g, gb->buffer, bytestream2_get_bytes_left(gb));
if (ret < 0)
return ret;
height = img_info[curr_res].height;
while (y < height) {
uint8_t *data;
int x2, idx;
for (; get_bits_left(&g) > 0;) {
if ((show_bits(&g, 24) & 0xfff000) == 0xfff000)
break;
skip_bits(&g, 8);
}
shiftreg = show_bits_long(&g, 32) & 0xffffff00;
while (shiftreg != 0xfffffe00) {
if (get_bits_left(&g) <= 0)
return AVERROR_INVALIDDATA;
skip_bits(&g, 1);
shiftreg = show_bits_long(&g, 32) & 0xffffff00;
}
skip_bits(&g, 16);
y = show_bits_long(&g, 23) & 0x1fff;
skip_bits(&g, 8);
if (y >= height)
break;
type = get_bits(&g, 2);
skip_bits(&g, 14);
if (type == 1)
return AVERROR_INVALIDDATA;
idx = type2idx[type];
data = frame->data[idx] + (y >> !!idx) * frame->linesize[idx];
x2 = avctx->width >> (scaling + !!idx);
for (int x = 0; x < x2; x++) {
int m;
if (get_bits_left(&g) <= 0)
return AVERROR_INVALIDDATA;
m = get_vlc2(&g, s->vlc[idx].table, s->vlc[idx].bits, 2);
if (m < 0)
return AVERROR_INVALIDDATA;
m = sign_extend(m, 8);
data[x] = av_clip_uint8(data[x] + m);
}
}
s->streampos += (get_bits_count(&g) + 7) >> 3;
s->streampos = (s->streampos + 0x6000 + 2047) & ~0x7ff;
return 0;
}
static int photocd_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
PhotoCDContext *s = avctx->priv_data;
ThreadFrame frame = { .f = data };
const uint8_t *buf = avpkt->data;
GetByteContext *gb = &s->gb;
AVFrame *p = data;
uint8_t *ptr, *ptr1, *ptr2;
int ret;
if (avpkt->size < img_info[0].start)
return AVERROR_INVALIDDATA;
if (!memcmp("PCD_OPA", buf, 7)) {
s->thumbnails = AV_RL16(buf + 10);
av_log(avctx, AV_LOG_WARNING, "this is a thumbnails file, "
"reading first thumbnail only\n");
} else if (avpkt->size < 786432) {
return AVERROR_INVALIDDATA;
} else if (memcmp("PCD_IPI", buf + 0x800, 7)) {
return AVERROR_INVALIDDATA;
}
s->orientation = s->thumbnails ? buf[12] & 3 : buf[0x48] & 3;
if (s->thumbnails)
s->resolution = 0;
else if (avpkt->size <= 788480)
s->resolution = 2;
else
s->resolution = av_clip(4 - s->lowres, 0, 4);
avctx->width = img_info[s->resolution].width;
avctx->height = img_info[s->resolution].height;
if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
return ret;
p->pict_type = AV_PICTURE_TYPE_I;
p->key_frame = 1;
bytestream2_init(gb, avpkt->data, avpkt->size);
if (s->resolution < 3) {
ptr = p->data[0];
ptr1 = p->data[1];
ptr2 = p->data[2];
if (s->thumbnails)
bytestream2_seek(gb, 10240, SEEK_SET);
else
bytestream2_seek(gb, img_info[s->resolution].start, SEEK_SET);
for (int y = 0; y < avctx->height; y += 2) {
bytestream2_get_buffer(gb, ptr, avctx->width);
ptr += p->linesize[0];
bytestream2_get_buffer(gb, ptr, avctx->width);
ptr += p->linesize[0];
bytestream2_get_buffer(gb, ptr1, avctx->width >> 1);
ptr1 += p->linesize[1];
bytestream2_get_buffer(gb, ptr2, avctx->width >> 1);
ptr2 += p->linesize[2];
}
} else {
s->streampos = 0;
ptr = p->data[0];
ptr1 = p->data[1];
ptr2 = p->data[2];
interp_lowres(s, p, img_info[2].width, img_info[2].height);
interp_lines(ptr1, p->linesize[1], img_info[2].width, img_info[2].height);
interp_lines(ptr2, p->linesize[2], img_info[2].width, img_info[2].height);
if (s->resolution == 4) {
interp_pixels(ptr1, p->linesize[1], img_info[3].width, img_info[3].height);
interp_lines (ptr1, p->linesize[1], img_info[3].width, img_info[3].height);
interp_pixels(ptr2, p->linesize[2], img_info[3].width, img_info[3].height);
interp_lines (ptr2, p->linesize[2], img_info[3].width, img_info[3].height);
}
interp_lines(ptr, p->linesize[0], img_info[3].width, img_info[3].height);
s->streampos = 0xc2000;
for (int n = 0; n < 3; n++) {
if ((ret = read_hufftable(avctx, &s->vlc[n])) < 0)
return ret;
}
s->streampos = (s->streampos + 2047) & ~0x3ff;
if (decode_huff(avctx, p, s->resolution, 3) < 0)
return AVERROR_INVALIDDATA;
if (s->resolution == 4) {
interp_pixels(ptr, p->linesize[0], img_info[4].width, img_info[4].height);
interp_lines (ptr, p->linesize[0], img_info[4].width, img_info[4].height);
for (int n = 0; n < 3; n++) {
if ((ret = read_hufftable(avctx, &s->vlc[n])) < 0)
return ret;
}
s->streampos = (s->streampos + 2047) & ~0x3ff;
if (decode_huff(avctx, p, 4, 4) < 0)
return AVERROR_INVALIDDATA;
}
}
{
ptr1 = p->data[1];
ptr2 = p->data[2];
for (int y = 0; y < avctx->height >> 1; y++) {
for (int x = 0; x < avctx->width >> 1; x++) {
ptr1[x] = av_clip_uint8(ptr1[x] - 28);
ptr2[x] = av_clip_uint8(ptr2[x] - 9);
}
ptr1 += p->linesize[1];
ptr2 += p->linesize[2];
}
}
*got_frame = 1;
return 0;
}
static av_cold int photocd_decode_init(AVCodecContext *avctx)
{
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
avctx->colorspace = AVCOL_SPC_BT709;
avctx->color_primaries = AVCOL_PRI_BT709;
avctx->color_trc = AVCOL_TRC_IEC61966_2_1;
avctx->color_range = AVCOL_RANGE_JPEG;
return 0;
}
static av_cold int photocd_decode_close(AVCodecContext *avctx)
{
PhotoCDContext *s = avctx->priv_data;
for (int i = 0; i < 3; i++)
ff_free_vlc(&s->vlc[i]);
return 0;
}
#define OFFSET(x) offsetof(PhotoCDContext, x)
#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
{ "lowres", "Lower the decoding resolution by a power of two",
OFFSET(lowres), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 4, VD },
{ NULL },
};
static const AVClass photocd_class = {
.class_name = "photocd",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVCodec ff_photocd_decoder = {
.name = "photocd",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_PHOTOCD,
.priv_data_size = sizeof(PhotoCDContext),
.priv_class = &photocd_class,
.init = photocd_decode_init,
.close = photocd_decode_close,
.decode = photocd_decode_frame,
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
.long_name = NULL_IF_CONFIG_SMALL("Kodak Photo CD"),
};
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