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Pomme/src/Video/Cinepak.cpp

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// Adapted from ffmpeg
// ---- Begin ffmpeg copyright notices ----
/*
* Cinepak Video Decoder
* Copyright (C) 2003 The FFmpeg project
*
* 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
* Cinepak video decoder
* @author Ewald Snel <ewald@rambo.its.tudelft.nl>
*
* Cinepak colorspace support (c) 2013 Rl, Aetey Global Technologies AB
* @author Cinepak colorspace, Rl, Aetey Global Technologies AB
*/
// ---- End ffmpeg copyright notices ----
#include "Video/Cinepak.h"
#include <cstring>
#include <fstream>
class CinepakException : public std::runtime_error
{
public:
CinepakException(const char* m) : std::runtime_error(m)
{}
};
static uint8_t av_clip_uint8(int x)
{
return x > 255 ? 255 : (x < 0 ? 0 : x);
}
static uint16_t AV_RB16(const uint8_t* in)
{
return ((uint16_t)in[0] << 8)
| ((uint16_t)in[1]);
}
static uint32_t AV_RB24(const uint8_t* in)
{
return ((uint32_t)in[0] << 16)
| ((uint32_t)in[1] << 8)
| (uint32_t)in[2];
}
static uint32_t AV_RB32(const uint8_t* in)
{
return ((uint32_t)in[0] << 24)
| ((uint32_t)in[1] << 16)
| ((uint32_t)in[2] << 8)
| (uint32_t)in[3];
}
static void cinepak_decode_codebook (cvid_codebook *codebook,
int chunk_id, int size, const uint8_t *data)
{
const uint8_t *eod = (data + size);
uint32_t flag, mask;
int i, n;
uint8_t *p;
/* check if this chunk contains 4- or 6-element vectors */
n = (chunk_id & 0x04) ? 4 : 6;
flag = 0;
mask = 0;
p = codebook[0];
for (i=0; i < 256; i++) {
if ((chunk_id & 0x01) && !(mask >>= 1)) {
if ((data + 4) > eod)
break;
flag = AV_RB32 (data);
data += 4;
mask = 0x80000000;
}
if (!(chunk_id & 0x01) || (flag & mask)) {
int k, kk;
if ((data + n) > eod)
break;
for (k = 0; k < 4; ++k) {
int r = *data++;
for (kk = 0; kk < 3; ++kk)
*p++ = r;
}
if (n == 6) {
int r, g, b, u, v;
u = *(int8_t *)data++;
v = *(int8_t *)data++;
p -= 12;
for(k=0; k<4; ++k) {
r = *p++ + v*2;
g = *p++ - (u/2) - v;
b = *p + u*2;
p -= 2;
*p++ = av_clip_uint8(r);
*p++ = av_clip_uint8(g);
*p++ = av_clip_uint8(b);
}
}
} else {
p += 12;
}
}
}
void cinepak_decode_vectors (
CinepakContext *s,
cvid_strip *strip,
int chunk_id,
int size,
const uint8_t *data)
{
const uint8_t *eod = (data + size);
uint32_t flag, mask;
uint8_t *cb0, *cb1, *cb2, *cb3;
int x, y;
uint8_t *ip0, *ip1, *ip2, *ip3;
flag = 0;
mask = 0;
for (y=strip->y1; y < strip->y2; y+=4) {
/* take care of y dimension not being multiple of 4, such streams exist */
ip0 = ip1 = ip2 = ip3 = s->frame_data0 +
(strip->x1*3) + (y * s->frame_linesize0);
if(s->avctx_height - y > 1) {
ip1 = ip0 + s->frame_linesize0;
if(s->avctx_height - y > 2) {
ip2 = ip1 + s->frame_linesize0;
if(s->avctx_height - y > 3) {
ip3 = ip2 + s->frame_linesize0;
}
}
}
/* to get the correct picture for not-multiple-of-4 cases let us fill each
* block from the bottom up, thus possibly overwriting the bottommost line
* more than once but ending with the correct data in place
* (instead of in-loop checking) */
for (x=strip->x1; x < strip->x2; x+=4) {
if ((chunk_id & 0x01) && !(mask >>= 1)) {
if ((data + 4) > eod)
throw CinepakException("invalid data");
flag = AV_RB32 (data);
data += 4;
mask = 0x80000000;
}
if (!(chunk_id & 0x01) || (flag & mask)) {
if (!(chunk_id & 0x02) && !(mask >>= 1)) {
if ((data + 4) > eod)
throw CinepakException("invalid data");
flag = AV_RB32 (data);
data += 4;
mask = 0x80000000;
}
if ((chunk_id & 0x02) || (~flag & mask)) {
uint8_t *p;
if (data >= eod)
throw CinepakException("invalid data");
p = strip->v1_codebook[*data++];
p += 6;
memcpy(ip3 + 0, p, 3); memcpy(ip3 + 3, p, 3);
memcpy(ip2 + 0, p, 3); memcpy(ip2 + 3, p, 3);
p += 3; /* ... + 9 */
memcpy(ip3 + 6, p, 3); memcpy(ip3 + 9, p, 3);
memcpy(ip2 + 6, p, 3); memcpy(ip2 + 9, p, 3);
p -= 9; /* ... + 0 */
memcpy(ip1 + 0, p, 3); memcpy(ip1 + 3, p, 3);
memcpy(ip0 + 0, p, 3); memcpy(ip0 + 3, p, 3);
p += 3; /* ... + 3 */
memcpy(ip1 + 6, p, 3); memcpy(ip1 + 9, p, 3);
memcpy(ip0 + 6, p, 3); memcpy(ip0 + 9, p, 3);
} else if (flag & mask) {
if ((data + 4) > eod)
throw CinepakException("invalid data");
cb0 = strip->v4_codebook[*data++];
cb1 = strip->v4_codebook[*data++];
cb2 = strip->v4_codebook[*data++];
cb3 = strip->v4_codebook[*data++];
memcpy(ip3 + 0, cb2 + 6, 6);
memcpy(ip3 + 6, cb3 + 6, 6);
memcpy(ip2 + 0, cb2 + 0, 6);
memcpy(ip2 + 6, cb3 + 0, 6);
memcpy(ip1 + 0, cb0 + 6, 6);
memcpy(ip1 + 6, cb1 + 6, 6);
memcpy(ip0 + 0, cb0 + 0, 6);
memcpy(ip0 + 6, cb1 + 0, 6);
}
}
ip0 += 12; ip1 += 12;
ip2 += 12; ip3 += 12;
}
}
}
void cinepak_decode_strip (
CinepakContext *s,
cvid_strip *strip,
const uint8_t *data,
int size)
{
const uint8_t *eod = (data + size);
int chunk_id, chunk_size;
/* coordinate sanity checks */
if (strip->x2 > s->width ||
strip->y2 > s->height ||
strip->x1 >= strip->x2 || strip->y1 >= strip->y2)
throw CinepakException("invalid data");
while ((data + 4) <= eod) {
chunk_id = data[0];
chunk_size = AV_RB24 (&data[1]) - 4;
if(chunk_size < 0)
throw CinepakException("invalid data");
data += 4;
chunk_size = ((data + chunk_size) > eod) ? (eod - data) : chunk_size;
switch (chunk_id) {
case 0x20:
case 0x21:
case 0x24:
case 0x25:
cinepak_decode_codebook (strip->v4_codebook, chunk_id, chunk_size, data);
break;
case 0x22:
case 0x23:
case 0x26:
case 0x27:
cinepak_decode_codebook (strip->v1_codebook, chunk_id, chunk_size, data);
break;
case 0x30:
case 0x31:
case 0x32:
cinepak_decode_vectors (s, strip, chunk_id, chunk_size, data);
return;
}
data += chunk_size;
}
throw CinepakException("invalid data");
}
void cinepak_predecode_check (CinepakContext *s)
{
int num_strips;
int encoded_buf_size;
num_strips = AV_RB16 (&s->data[8]);
encoded_buf_size = AV_RB24(&s->data[1]);
if (s->size < encoded_buf_size)
throw CinepakException("invalid data");
if (s->size < 10 /*+ s->sega_film_skip_bytes*/ + num_strips * 12)
throw CinepakException("invalid data");
if (num_strips) {
const uint8_t* data = s->data + 10; //+ s->sega_film_skip_bytes;
int strip_size = AV_RB24 (data + 1);
if (strip_size < 12 || strip_size > encoded_buf_size)
throw CinepakException("invalid data");
}
}
static void cinepak_decode (CinepakContext *s)
{
const uint8_t *eod = (s->data + s->size);
int i, strip_size, frame_flags, num_strips;
int y0 = 0;
frame_flags = s->data[0];
num_strips = AV_RB16 (&s->data[8]);
s->data += 10;
num_strips = std::min(num_strips, CINEPAK_MAX_STRIPS);
// s->frame->key_frame = 0;
for (i=0; i < num_strips; i++) {
if ((s->data + 12) > eod)
throw CinepakException("invalid data");
s->strips[i].id = s->data[0];
/* zero y1 means "relative to the previous stripe" */
if (!(s->strips[i].y1 = AV_RB16 (&s->data[4])))
s->strips[i].y2 = (s->strips[i].y1 = y0) + AV_RB16 (&s->data[8]);
else
s->strips[i].y2 = AV_RB16 (&s->data[8]);
s->strips[i].x1 = AV_RB16 (&s->data[6]);
s->strips[i].x2 = AV_RB16 (&s->data[10]);
// if (s->strips[i].id == 0x10)
// s->frame->key_frame = 1;
strip_size = AV_RB24 (&s->data[1]) - 12;
if (strip_size < 0)
throw CinepakException("invalid data");
s->data += 12;
strip_size = ((s->data + strip_size) > eod) ? (eod - s->data) : strip_size;
if ((i > 0) && !(frame_flags & 0x01)) {
memcpy (s->strips[i].v4_codebook, s->strips[i-1].v4_codebook,
sizeof(s->strips[i].v4_codebook));
memcpy (s->strips[i].v1_codebook, s->strips[i-1].v1_codebook,
sizeof(s->strips[i].v1_codebook));
}
cinepak_decode_strip (s, &s->strips[i], s->data, strip_size);
s->data += strip_size;
y0 = s->strips[i].y2;
}
}
CinepakContext::CinepakContext(int _width, int _height)
: strips(CINEPAK_MAX_STRIPS)
{
avctx_width = _width;
avctx_height = _height;
width = (avctx_width + 3) & ~3;
height = (avctx_height + 3) & ~3;
frame_data0 = new uint8_t[width * height * 3];
frame_linesize0 = width*3;
if (!frame_data0)
throw CinepakException("couldn't allocate frame");
}
void CinepakContext::DecodeFrame(const uint8_t* packet_data, const int packet_size)
{
if (packet_size < 10)
throw CinepakException("invalid data -- input buffer too small?");
this->data = packet_data;
this->size = packet_size;
int num_strips = AV_RB16 (&this->data[8]);
//Empty frame, do not waste time
if (!num_strips)
return;
cinepak_predecode_check(this);
cinepak_decode(this);
}
CinepakContext::~CinepakContext()
{
delete[] frame_data0;
}
void CinepakContext::DumpFrameTGA(const char* outFN)
{
std::ofstream out(outFN, std::ios::out | std::ios::binary);
uint16_t TGAhead[] = { 0, 2, 0, 0, 0, 0, (uint16_t)width, (uint16_t)height, 24 };
out.write(reinterpret_cast<char*>(&TGAhead), sizeof(TGAhead));
out.write(reinterpret_cast<char*>(frame_data0), width*height*3);
}
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