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third_party_ffmpeg/libavcodec/dsicinav.c
Michael Niedermayer 0a28a52d53 Merge commit 'dd0bfc3a6a310e3e3674ce7742672d689a9a0e93' 
* commit 'dd0bfc3a6a310e3e3674ce7742672d689a9a0e93':
  dsicinav: Bound-check the source buffer when needed

Conflicts:
	libavcodec/dsicinav.c

See: 47f0beadba
Merged-by: Michael Niedermayer <michaelni@gmx.at>
2013-07-21 11:59:16 +02:00

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/*
* Delphine Software International CIN Audio/Video Decoders
* 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 audio/video decoders
*/
#include "libavutil/channel_layout.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "mathops.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;
typedef struct CinAudioContext {
int initial_decode_frame;
int delta;
} CinAudioContext;
/* table defining a geometric sequence with multiplier = 32767 ^ (1 / 128) */
static const int16_t cinaudio_delta16_table[256] = {
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, -30210, -27853, -25680, -23677, -21829,
-20126, -18556, -17108, -15774, -14543, -13408, -12362, -11398,
-10508, -9689, -8933, -8236, -7593, -7001, -6455, -5951,
-5487, -5059, -4664, -4300, -3964, -3655, -3370, -3107,
-2865, -2641, -2435, -2245, -2070, -1908, -1759, -1622,
-1495, -1379, -1271, -1172, -1080, -996, -918, -847,
-781, -720, -663, -612, -564, -520, -479, -442,
-407, -376, -346, -319, -294, -271, -250, -230,
-212, -196, -181, -166, -153, -141, -130, -120,
-111, -102, -94, -87, -80, -74, -68, -62,
-58, -53, -49, -45, -41, -38, -35, -32,
-30, -27, -25, -23, -21, -20, -18, -17,
-15, -14, -13, -12, -11, -10, -9, -8,
-7, -6, -5, -4, -3, -2, -1, 0,
0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15,
17, 18, 20, 21, 23, 25, 27, 30,
32, 35, 38, 41, 45, 49, 53, 58,
62, 68, 74, 80, 87, 94, 102, 111,
120, 130, 141, 153, 166, 181, 196, 212,
230, 250, 271, 294, 319, 346, 376, 407,
442, 479, 520, 564, 612, 663, 720, 781,
847, 918, 996, 1080, 1172, 1271, 1379, 1495,
1622, 1759, 1908, 2070, 2245, 2435, 2641, 2865,
3107, 3370, 3655, 3964, 4300, 4664, 5059, 5487,
5951, 6455, 7001, 7593, 8236, 8933, 9689, 10508,
11398, 12362, 13408, 14543, 15774, 17108, 18556, 20126,
21829, 23677, 25680, 27853, 30210, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0
};
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;
avcodec_get_frame_defaults(&cin->frame);
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;
}
}
}
}
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;
}
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:
cin_decode_rle(buf, bitmap_frame_size,
cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
break;
case 34:
cin_decode_rle(buf, bitmap_frame_size,
cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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);
cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
break;
case 36:
bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
cin->bitmap_table[CIN_INT_BMP],
cin->bitmap_size);
cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
break;
case 37:
cin_decode_huffman(buf, bitmap_frame_size,
cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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)
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_unref(&cin->frame);
destroy_buffers(cin);
return 0;
}
static av_cold int cinaudio_decode_init(AVCodecContext *avctx)
{
CinAudioContext *cin = avctx->priv_data;
cin->initial_decode_frame = 1;
cin->delta = 0;
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
avctx->channels = 1;
avctx->channel_layout = AV_CH_LAYOUT_MONO;
return 0;
}
static int cinaudio_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
AVFrame *frame = data;
const uint8_t *buf = avpkt->data;
CinAudioContext *cin = avctx->priv_data;
const uint8_t *buf_end = buf + avpkt->size;
int16_t *samples;
int delta, ret;
/* get output buffer */
frame->nb_samples = avpkt->size - cin->initial_decode_frame;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
samples = (int16_t *)frame->data[0];
delta = cin->delta;
if (cin->initial_decode_frame) {
cin->initial_decode_frame = 0;
delta = sign_extend(AV_RL16(buf), 16);
buf += 2;
*samples++ = delta;
}
while (buf < buf_end) {
delta += cinaudio_delta16_table[*buf++];
delta = av_clip_int16(delta);
*samples++ = delta;
}
cin->delta = delta;
*got_frame_ptr = 1;
return avpkt->size;
}
AVCodec ff_dsicinvideo_decoder = {
.name = "dsicinvideo",
.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,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"),
};
AVCodec ff_dsicinaudio_decoder = {
.name = "dsicinaudio",
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_DSICINAUDIO,
.priv_data_size = sizeof(CinAudioContext),
.init = cinaudio_decode_init,
.decode = cinaudio_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN audio"),
};
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