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FFmpeg/libavcodec/dsicinvideo.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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/*
* Delphine Software International CIN video decoder
* Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
*
* 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
* Delphine Software International CIN video decoder
*/
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "internal.h"
typedef enum CinVideoBitmapIndex {
CIN_CUR_BMP = 0, /* current */
CIN_PRE_BMP = 1, /* previous */
CIN_INT_BMP = 2 /* intermediate */
} CinVideoBitmapIndex;
typedef struct CinVideoContext {
AVCodecContext *avctx;
AVFrame *frame;
unsigned int bitmap_size;
uint32_t palette[256];
uint8_t *bitmap_table[3];
} CinVideoContext;
static av_cold void destroy_buffers(CinVideoContext *cin)
{
int i;
for (i = 0; i < 3; ++i)
av_freep(&cin->bitmap_table[i]);
}
static av_cold int allocate_buffers(CinVideoContext *cin)
{
int i;
for (i = 0; i < 3; ++i) {
cin->bitmap_table[i] = av_mallocz(cin->bitmap_size);
if (!cin->bitmap_table[i]) {
av_log(cin->avctx, AV_LOG_ERROR, "Can't allocate bitmap buffers.\n");
return AVERROR(ENOMEM);
}
}
return 0;
}
static av_cold int cinvideo_decode_init(AVCodecContext *avctx)
{
CinVideoContext *cin = avctx->priv_data;
cin->avctx = avctx;
avctx->pix_fmt = AV_PIX_FMT_PAL8;
cin->frame = av_frame_alloc();
if (!cin->frame)
return AVERROR(ENOMEM);
cin->bitmap_size = avctx->width * avctx->height;
if (allocate_buffers(cin))
return AVERROR(ENOMEM);
return 0;
}
static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst,
int size)
{
while (size--)
*dst++ += *src++;
}
static int cin_decode_huffman(const unsigned char *src, int src_size,
unsigned char *dst, int dst_size)
{
int b, huff_code = 0;
unsigned char huff_code_table[15];
unsigned char *dst_cur = dst;
unsigned char *dst_end = dst + dst_size;
const unsigned char *src_end = src + src_size;
memcpy(huff_code_table, src, 15);
src += 15;
while (src < src_end) {
huff_code = *src++;
if ((huff_code >> 4) == 15) {
b = huff_code << 4;
huff_code = *src++;
*dst_cur++ = b | (huff_code >> 4);
} else
*dst_cur++ = huff_code_table[huff_code >> 4];
if (dst_cur >= dst_end)
break;
huff_code &= 15;
if (huff_code == 15) {
*dst_cur++ = *src++;
} else
*dst_cur++ = huff_code_table[huff_code];
if (dst_cur >= dst_end)
break;
}
return dst_cur - dst;
}
static int cin_decode_lzss(const unsigned char *src, int src_size,
unsigned char *dst, int dst_size)
{
uint16_t cmd;
int i, sz, offset, code;
unsigned char *dst_end = dst + dst_size, *dst_start = dst;
const unsigned char *src_end = src + src_size;
while (src < src_end && dst < dst_end) {
code = *src++;
for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) {
if (code & (1 << i)) {
*dst++ = *src++;
} else {
cmd = AV_RL16(src);
src += 2;
offset = cmd >> 4;
if ((int)(dst - dst_start) < offset + 1)
return AVERROR_INVALIDDATA;
sz = (cmd & 0xF) + 2;
/* don't use memcpy/memmove here as the decoding routine
* (ab)uses buffer overlappings to repeat bytes in the
* destination */
sz = FFMIN(sz, dst_end - dst);
while (sz--) {
*dst = *(dst - offset - 1);
++dst;
}
}
}
}
if (dst_end - dst > dst_size - dst_size/10)
return AVERROR_INVALIDDATA;
return 0;
}
static int cin_decode_rle(const unsigned char *src, int src_size,
unsigned char *dst, int dst_size)
{
int len, code;
unsigned char *dst_end = dst + dst_size;
const unsigned char *src_end = src + src_size;
while (src + 1 < src_end && dst < dst_end) {
code = *src++;
if (code & 0x80) {
len = code - 0x7F;
memset(dst, *src++, FFMIN(len, dst_end - dst));
} else {
len = code + 1;
if (len > src_end-src) {
av_log(NULL, AV_LOG_ERROR, "RLE overread\n");
return AVERROR_INVALIDDATA;
}
memcpy(dst, src, FFMIN3(len, dst_end - dst, src_end - src));
src += len;
}
dst += len;
}
if (dst_end - dst > dst_size - dst_size/10)
return AVERROR_INVALIDDATA;
return 0;
}
static int cinvideo_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
CinVideoContext *cin = avctx->priv_data;
int i, y, palette_type, palette_colors_count,
bitmap_frame_type, bitmap_frame_size, res = 0;
palette_type = buf[0];
palette_colors_count = AV_RL16(buf + 1);
bitmap_frame_type = buf[3];
buf += 4;
bitmap_frame_size = buf_size - 4;
/* handle palette */
if (bitmap_frame_size < palette_colors_count * (3 + (palette_type != 0)))
return AVERROR_INVALIDDATA;
if (palette_type == 0) {
if (palette_colors_count > 256)
return AVERROR_INVALIDDATA;
for (i = 0; i < palette_colors_count; ++i) {
cin->palette[i] = 0xFFU << 24 | bytestream_get_le24(&buf);
bitmap_frame_size -= 3;
}
} else {
for (i = 0; i < palette_colors_count; ++i) {
cin->palette[buf[0]] = 0xFFU << 24 | AV_RL24(buf + 1);
buf += 4;
bitmap_frame_size -= 4;
}
}
/* note: the decoding routines below assumes that
* surface.width = surface.pitch */
switch (bitmap_frame_type) {
case 9:
res = cin_decode_rle(buf, bitmap_frame_size,
cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
if (res < 0)
return res;
break;
case 34:
res = cin_decode_rle(buf, bitmap_frame_size,
cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
if (res < 0)
return res;
cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
break;
case 35:
bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
res = cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
if (res < 0)
return res;
break;
case 36:
bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
cin->bitmap_table[CIN_INT_BMP],
cin->bitmap_size);
res = cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
if (res < 0)
return res;
cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
break;
case 37:
res = cin_decode_huffman(buf, bitmap_frame_size,
cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
if (cin->bitmap_size - avctx->discard_damaged_percentage*cin->bitmap_size/100 > res)
return AVERROR_INVALIDDATA;
break;
case 38:
res = cin_decode_lzss(buf, bitmap_frame_size,
cin->bitmap_table[CIN_CUR_BMP],
cin->bitmap_size);
if (res < 0)
return res;
break;
case 39:
res = cin_decode_lzss(buf, bitmap_frame_size,
cin->bitmap_table[CIN_CUR_BMP],
cin->bitmap_size);
if (res < 0)
return res;
cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
break;
}
if ((res = ff_reget_buffer(avctx, cin->frame, 0)) < 0)
return res;
memcpy(cin->frame->data[1], cin->palette, sizeof(cin->palette));
cin->frame->palette_has_changed = 1;
for (y = 0; y < cin->avctx->height; ++y)
memcpy(cin->frame->data[0] + (cin->avctx->height - 1 - y) * cin->frame->linesize[0],
cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,
cin->avctx->width);
FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP],
cin->bitmap_table[CIN_PRE_BMP]);
if ((res = av_frame_ref(rframe, cin->frame)) < 0)
return res;
*got_frame = 1;
return buf_size;
}
static av_cold int cinvideo_decode_end(AVCodecContext *avctx)
{
CinVideoContext *cin = avctx->priv_data;
av_frame_free(&cin->frame);
destroy_buffers(cin);
return 0;
}
const FFCodec ff_dsicinvideo_decoder = {
.p.name = "dsicinvideo",
.p.long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_DSICINVIDEO,
.priv_data_size = sizeof(CinVideoContext),
.init = cinvideo_decode_init,
.close = cinvideo_decode_end,
FF_CODEC_DECODE_CB(cinvideo_decode_frame),
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
.p.capabilities = AV_CODEC_CAP_DR1,
};
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