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FFmpeg/libavcodec/photocd.c
Andreas Rheinhardt 4243da4ff4 avcodec/codec_internal: Use union for FFCodec decode/encode callbacks 
This is possible, because every given FFCodec has to implement
exactly one of these. Doing so decreases sizeof(FFCodec) and
therefore decreases the size of the binary.
Notice that in case of position-independent code the decrease
is in .data.rel.ro, so that this translates to decreased
memory consumption.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-04-05 20:02:37 +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/intreadwrite.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.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, 12) == 0xfff)
break;
skip_bits(&g, 8);
}
shiftreg = show_bits(&g, 24);
while (shiftreg != 0xfffffe) {
if (get_bits_left(&g) <= 0)
return AVERROR_INVALIDDATA;
skip_bits(&g, 1);
shiftreg = show_bits(&g, 24);
}
skip_bits(&g, 24);
y = show_bits(&g, 15) & 0x1fff;
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, AVFrame *p,
int *got_frame, AVPacket *avpkt)
{
PhotoCDContext *s = avctx->priv_data;
const uint8_t *buf = avpkt->data;
GetByteContext *gb = &s->gb;
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);
ret = ff_set_dimensions(avctx, img_info[s->resolution].width, img_info[s->resolution].height);
if (ret < 0)
return ret;
if ((ret = ff_thread_get_buffer(avctx, p, 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,
};
const FFCodec ff_photocd_decoder = {
.p.name = "photocd",
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_PHOTOCD,
.priv_data_size = sizeof(PhotoCDContext),
.p.priv_class = &photocd_class,
.init = photocd_decode_init,
.close = photocd_decode_close,
FF_CODEC_DECODE_CB(photocd_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
.p.long_name = NULL_IF_CONFIG_SMALL("Kodak Photo CD"),
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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