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FFmpeg/libavcodec/dsicinvideo.c
James Almer 9ea6d2149e avcodec/decode: add a flags parameter to ff_reget_buffer() 
Some decoders may not need a writable buffer in some specific cases, but only
a reference to the existing buffer with updated frame properties instead, for
the purpose of returning duplicate frames. For this, the
FF_REGET_BUFFER_FLAG_READONLY flag is added, which will prevent potential
allocations and buffer copies when they are not needed.

Signed-off-by: James Almer <jamrial@gmail.com>
2019-09-04 10:07:12 -03:00

337 lines
10 KiB
C
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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 "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");
destroy_buffers(cin);
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,
void *data, 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(data, 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;
}
AVCodec ff_dsicinvideo_decoder = {
.name = "dsicinvideo",
.long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_DSICINVIDEO,
.priv_data_size = sizeof(CinVideoContext),
.init = cinvideo_decode_init,
.close = cinvideo_decode_end,
.decode = cinvideo_decode_frame,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
.capabilities = AV_CODEC_CAP_DR1,
};
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