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FFmpeg/libavcodec/interplayvideo.c
Stefano Sabatini 72415b2adb Define AVMediaType enum, and use it instead of enum CodecType, which 
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-30 23:30:55 +00:00

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/*
* Interplay MVE 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 libavcodec/interplayvideo.c
* Interplay MVE Video Decoder by Mike Melanson (melanson@pcisys.net)
* For more information about the Interplay MVE format, visit:
* http://www.pcisys.net/~melanson/codecs/interplay-mve.txt
* This code is written in such a way that the identifiers match up
* with the encoding descriptions in the document.
*
* This decoder presently only supports a PAL8 output colorspace.
*
* An Interplay video frame consists of 2 parts: The decoding map and
* the video data. A demuxer must load these 2 parts together in a single
* buffer before sending it through the stream to this decoder.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "avcodec.h"
#include "bytestream.h"
#include "dsputil.h"
#define ALT_BITSTREAM_READER_LE
#include "get_bits.h"
#define PALETTE_COUNT 256
/* debugging support */
#define DEBUG_INTERPLAY 0
#if DEBUG_INTERPLAY
#define debug_interplay(x,...) av_log(NULL, AV_LOG_DEBUG, x, __VA_ARGS__)
#else
static inline void debug_interplay(const char *format, ...) { }
#endif
typedef struct IpvideoContext {
AVCodecContext *avctx;
DSPContext dsp;
AVFrame second_last_frame;
AVFrame last_frame;
AVFrame current_frame;
const unsigned char *decoding_map;
int decoding_map_size;
const unsigned char *buf;
int size;
int is_16bpp;
const unsigned char *stream_ptr;
const unsigned char *stream_end;
const uint8_t *mv_ptr;
const uint8_t *mv_end;
unsigned char *pixel_ptr;
int line_inc;
int stride;
int upper_motion_limit_offset;
} IpvideoContext;
#define CHECK_STREAM_PTR(stream_ptr, stream_end, n) \
if (stream_end - stream_ptr < n) { \
av_log(s->avctx, AV_LOG_ERROR, "Interplay video warning: stream_ptr out of bounds (%p >= %p)\n", \
stream_ptr + n, stream_end); \
return -1; \
}
static int copy_from(IpvideoContext *s, AVFrame *src, int delta_x, int delta_y)
{
int current_offset = s->pixel_ptr - s->current_frame.data[0];
int motion_offset = current_offset + delta_y * s->current_frame.linesize[0]
+ delta_x * (1 + s->is_16bpp);
if (motion_offset < 0) {
av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset);
return -1;
} else if (motion_offset > s->upper_motion_limit_offset) {
av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset above limit (%d >= %d)\n",
motion_offset, s->upper_motion_limit_offset);
return -1;
}
s->dsp.put_pixels_tab[!s->is_16bpp][0](s->pixel_ptr, src->data[0] + motion_offset,
s->current_frame.linesize[0], 8);
return 0;
}
static int ipvideo_decode_block_opcode_0x0(IpvideoContext *s)
{
return copy_from(s, &s->last_frame, 0, 0);
}
static int ipvideo_decode_block_opcode_0x1(IpvideoContext *s)
{
return copy_from(s, &s->second_last_frame, 0, 0);
}
static int ipvideo_decode_block_opcode_0x2(IpvideoContext *s)
{
unsigned char B;
int x, y;
/* copy block from 2 frames ago using a motion vector; need 1 more byte */
if (!s->is_16bpp) {
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 1);
B = *s->stream_ptr++;
} else {
CHECK_STREAM_PTR(s->mv_ptr, s->mv_end, 1);
B = *s->mv_ptr++;
}
if (B < 56) {
x = 8 + (B % 7);
y = B / 7;
} else {
x = -14 + ((B - 56) % 29);
y = 8 + ((B - 56) / 29);
}
debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
return copy_from(s, &s->second_last_frame, x, y);
}
static int ipvideo_decode_block_opcode_0x3(IpvideoContext *s)
{
unsigned char B;
int x, y;
/* copy 8x8 block from current frame from an up/left block */
/* need 1 more byte for motion */
if (!s->is_16bpp) {
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 1);
B = *s->stream_ptr++;
} else {
CHECK_STREAM_PTR(s->mv_ptr, s->mv_end, 1);
B = *s->mv_ptr++;
}
if (B < 56) {
x = -(8 + (B % 7));
y = -(B / 7);
} else {
x = -(-14 + ((B - 56) % 29));
y = -( 8 + ((B - 56) / 29));
}
debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
return copy_from(s, &s->current_frame, x, y);
}
static int ipvideo_decode_block_opcode_0x4(IpvideoContext *s)
{
int x, y;
unsigned char B, BL, BH;
/* copy a block from the previous frame; need 1 more byte */
if (!s->is_16bpp) {
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 1);
B = *s->stream_ptr++;
} else {
CHECK_STREAM_PTR(s->mv_ptr, s->mv_end, 1);
B = *s->mv_ptr++;
}
BL = B & 0x0F;
BH = (B >> 4) & 0x0F;
x = -8 + BL;
y = -8 + BH;
debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
return copy_from(s, &s->last_frame, x, y);
}
static int ipvideo_decode_block_opcode_0x5(IpvideoContext *s)
{
signed char x, y;
/* copy a block from the previous frame using an expanded range;
* need 2 more bytes */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 2);
x = *s->stream_ptr++;
y = *s->stream_ptr++;
debug_interplay (" motion bytes = %d, %d\n", x, y);
return copy_from(s, &s->last_frame, x, y);
}
static int ipvideo_decode_block_opcode_0x6(IpvideoContext *s)
{
/* mystery opcode? skip multiple blocks? */
av_log(s->avctx, AV_LOG_ERROR, " Interplay video: Help! Mystery opcode 0x6 seen\n");
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0x7(IpvideoContext *s)
{
int x, y;
unsigned char P[2];
unsigned int flags;
/* 2-color encoding */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 2);
P[0] = *s->stream_ptr++;
P[1] = *s->stream_ptr++;
if (P[0] <= P[1]) {
/* need 8 more bytes from the stream */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 8);
for (y = 0; y < 8; y++) {
flags = *s->stream_ptr++ | 0x100;
for (; flags != 1; flags >>= 1)
*s->pixel_ptr++ = P[flags & 1];
s->pixel_ptr += s->line_inc;
}
} else {
/* need 2 more bytes from the stream */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 2);
flags = bytestream_get_le16(&s->stream_ptr);
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x += 2, flags >>= 1) {
s->pixel_ptr[x ] =
s->pixel_ptr[x + 1 ] =
s->pixel_ptr[x + s->stride] =
s->pixel_ptr[x + 1 + s->stride] = P[flags & 1];
}
s->pixel_ptr += s->stride * 2;
}
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s)
{
int x, y;
unsigned char P[2];
unsigned int flags = 0;
/* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
* either top and bottom or left and right halves */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 2);
P[0] = *s->stream_ptr++;
P[1] = *s->stream_ptr++;
if (P[0] <= P[1]) {
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 14);
s->stream_ptr -= 2;
for (y = 0; y < 16; y++) {
// new values for each 4x4 block
if (!(y & 3)) {
P[0] = *s->stream_ptr++; P[1] = *s->stream_ptr++;
flags = bytestream_get_le16(&s->stream_ptr);
}
for (x = 0; x < 4; x++, flags >>= 1)
*s->pixel_ptr++ = P[flags & 1];
s->pixel_ptr += s->stride - 4;
// switch to right half
if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
}
} else {
/* need 10 more bytes */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 10);
if (s->stream_ptr[4] <= s->stream_ptr[5]) {
flags = bytestream_get_le32(&s->stream_ptr);
/* vertical split; left & right halves are 2-color encoded */
for (y = 0; y < 16; y++) {
for (x = 0; x < 4; x++, flags >>= 1)
*s->pixel_ptr++ = P[flags & 1];
s->pixel_ptr += s->stride - 4;
// switch to right half
if (y == 7) {
s->pixel_ptr -= 8 * s->stride - 4;
P[0] = *s->stream_ptr++; P[1] = *s->stream_ptr++;
flags = bytestream_get_le32(&s->stream_ptr);
}
}
} else {
/* horizontal split; top & bottom halves are 2-color encoded */
for (y = 0; y < 8; y++) {
if (y == 4) {
P[0] = *s->stream_ptr++;
P[1] = *s->stream_ptr++;
}
flags = *s->stream_ptr++ | 0x100;
for (; flags != 1; flags >>= 1)
*s->pixel_ptr++ = P[flags & 1];
s->pixel_ptr += s->line_inc;
}
}
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
{
int x, y;
unsigned char P[4];
/* 4-color encoding */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 4);
memcpy(P, s->stream_ptr, 4);
s->stream_ptr += 4;
if (P[0] <= P[1]) {
if (P[2] <= P[3]) {
/* 1 of 4 colors for each pixel, need 16 more bytes */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 16);
for (y = 0; y < 8; y++) {
/* get the next set of 8 2-bit flags */
int flags = bytestream_get_le16(&s->stream_ptr);
for (x = 0; x < 8; x++, flags >>= 2)
*s->pixel_ptr++ = P[flags & 0x03];
s->pixel_ptr += s->line_inc;
}
} else {
uint32_t flags;
/* 1 of 4 colors for each 2x2 block, need 4 more bytes */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 4);
flags = bytestream_get_le32(&s->stream_ptr);
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x += 2, flags >>= 2) {
s->pixel_ptr[x ] =
s->pixel_ptr[x + 1 ] =
s->pixel_ptr[x + s->stride] =
s->pixel_ptr[x + 1 + s->stride] = P[flags & 0x03];
}
s->pixel_ptr += s->stride * 2;
}
}
} else {
uint64_t flags;
/* 1 of 4 colors for each 2x1 or 1x2 block, need 8 more bytes */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 8);
flags = bytestream_get_le64(&s->stream_ptr);
if (P[2] <= P[3]) {
for (y = 0; y < 8; y++) {
for (x = 0; x < 8; x += 2, flags >>= 2) {
s->pixel_ptr[x ] =
s->pixel_ptr[x + 1] = P[flags & 0x03];
}
s->pixel_ptr += s->stride;
}
} else {
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x++, flags >>= 2) {
s->pixel_ptr[x ] =
s->pixel_ptr[x + s->stride] = P[flags & 0x03];
}
s->pixel_ptr += s->stride * 2;
}
}
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s)
{
int x, y;
unsigned char P[4];
int flags = 0;
/* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
* either top and bottom or left and right halves */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 24);
if (s->stream_ptr[0] <= s->stream_ptr[1]) {
/* 4-color encoding for each quadrant; need 32 bytes */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 32);
for (y = 0; y < 16; y++) {
// new values for each 4x4 block
if (!(y & 3)) {
memcpy(P, s->stream_ptr, 4);
s->stream_ptr += 4;
flags = bytestream_get_le32(&s->stream_ptr);
}
for (x = 0; x < 4; x++, flags >>= 2)
*s->pixel_ptr++ = P[flags & 0x03];
s->pixel_ptr += s->stride - 4;
// switch to right half
if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
}
} else {
// vertical split?
int vert = s->stream_ptr[12] <= s->stream_ptr[13];
uint64_t flags = 0;
/* 4-color encoding for either left and right or top and bottom
* halves */
for (y = 0; y < 16; y++) {
// load values for each half
if (!(y & 7)) {
memcpy(P, s->stream_ptr, 4);
s->stream_ptr += 4;
flags = bytestream_get_le64(&s->stream_ptr);
}
for (x = 0; x < 4; x++, flags >>= 2)
*s->pixel_ptr++ = P[flags & 0x03];
if (vert) {
s->pixel_ptr += s->stride - 4;
// switch to right half
if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
} else if (y & 1) s->pixel_ptr += s->line_inc;
}
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xB(IpvideoContext *s)
{
int y;
/* 64-color encoding (each pixel in block is a different color) */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 64);
for (y = 0; y < 8; y++) {
memcpy(s->pixel_ptr, s->stream_ptr, 8);
s->stream_ptr += 8;
s->pixel_ptr += s->stride;
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xC(IpvideoContext *s)
{
int x, y;
/* 16-color block encoding: each 2x2 block is a different color */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 16);
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x += 2) {
s->pixel_ptr[x ] =
s->pixel_ptr[x + 1 ] =
s->pixel_ptr[x + s->stride] =
s->pixel_ptr[x + 1 + s->stride] = *s->stream_ptr++;
}
s->pixel_ptr += s->stride * 2;
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xD(IpvideoContext *s)
{
int y;
unsigned char P[2];
/* 4-color block encoding: each 4x4 block is a different color */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 4);
for (y = 0; y < 8; y++) {
if (!(y & 3)) {
P[0] = *s->stream_ptr++;
P[1] = *s->stream_ptr++;
}
memset(s->pixel_ptr, P[0], 4);
memset(s->pixel_ptr + 4, P[1], 4);
s->pixel_ptr += s->stride;
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xE(IpvideoContext *s)
{
int y;
unsigned char pix;
/* 1-color encoding: the whole block is 1 solid color */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 1);
pix = *s->stream_ptr++;
for (y = 0; y < 8; y++) {
memset(s->pixel_ptr, pix, 8);
s->pixel_ptr += s->stride;
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xF(IpvideoContext *s)
{
int x, y;
unsigned char sample[2];
/* dithered encoding */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 2);
sample[0] = *s->stream_ptr++;
sample[1] = *s->stream_ptr++;
for (y = 0; y < 8; y++) {
for (x = 0; x < 8; x += 2) {
*s->pixel_ptr++ = sample[ y & 1 ];
*s->pixel_ptr++ = sample[!(y & 1)];
}
s->pixel_ptr += s->line_inc;
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0x6_16(IpvideoContext *s)
{
signed char x, y;
/* copy a block from the second last frame using an expanded range */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 2);
x = *s->stream_ptr++;
y = *s->stream_ptr++;
debug_interplay (" motion bytes = %d, %d\n", x, y);
return copy_from(s, &s->second_last_frame, x, y);
}
static int ipvideo_decode_block_opcode_0x7_16(IpvideoContext *s)
{
int x, y;
uint16_t P[2];
unsigned int flags;
uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
/* 2-color encoding */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 4);
P[0] = bytestream_get_le16(&s->stream_ptr);
P[1] = bytestream_get_le16(&s->stream_ptr);
if (!(P[0] & 0x8000)) {
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 8);
for (y = 0; y < 8; y++) {
flags = *s->stream_ptr++ | 0x100;
for (; flags != 1; flags >>= 1)
*pixel_ptr++ = P[flags & 1];
pixel_ptr += s->line_inc;
}
} else {
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 2);
flags = bytestream_get_le16(&s->stream_ptr);
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x += 2, flags >>= 1) {
pixel_ptr[x ] =
pixel_ptr[x + 1 ] =
pixel_ptr[x + s->stride] =
pixel_ptr[x + 1 + s->stride] = P[flags & 1];
}
pixel_ptr += s->stride * 2;
}
}
return 0;
}
static int ipvideo_decode_block_opcode_0x8_16(IpvideoContext *s)
{
int x, y;
uint16_t P[2];
unsigned int flags = 0;
uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
/* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
* either top and bottom or left and right halves */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 4);
P[0] = bytestream_get_le16(&s->stream_ptr);
P[1] = bytestream_get_le16(&s->stream_ptr);
if (!(P[0] & 0x8000)) {
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 24);
s->stream_ptr -= 4;
for (y = 0; y < 16; y++) {
// new values for each 4x4 block
if (!(y & 3)) {
P[0] = bytestream_get_le16(&s->stream_ptr);
P[1] = bytestream_get_le16(&s->stream_ptr);
flags = bytestream_get_le16(&s->stream_ptr);
}
for (x = 0; x < 4; x++, flags >>= 1)
*pixel_ptr++ = P[flags & 1];
pixel_ptr += s->stride - 4;
// switch to right half
if (y == 7) pixel_ptr -= 8 * s->stride - 4;
}
} else {
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 12);
if (!(AV_RL16(s->stream_ptr + 4) & 0x8000)) {
flags = bytestream_get_le32(&s->stream_ptr);
/* vertical split; left & right halves are 2-color encoded */
for (y = 0; y < 16; y++) {
for (x = 0; x < 4; x++, flags >>= 1)
*pixel_ptr++ = P[flags & 1];
pixel_ptr += s->stride - 4;
// switch to right half
if (y == 7) {
pixel_ptr -= 8 * s->stride - 4;
P[0] = bytestream_get_le16(&s->stream_ptr);
P[1] = bytestream_get_le16(&s->stream_ptr);
flags = bytestream_get_le32(&s->stream_ptr);
}
}
} else {
/* horizontal split; top & bottom halves are 2-color encoded */
for (y = 0; y < 8; y++) {
if (y == 4) {
P[0] = bytestream_get_le16(&s->stream_ptr);
P[1] = bytestream_get_le16(&s->stream_ptr);
}
flags = *s->stream_ptr++ | 0x100;
for (; flags != 1; flags >>= 1)
*pixel_ptr++ = P[flags & 1];
pixel_ptr += s->line_inc;
}
}
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0x9_16(IpvideoContext *s)
{
int x, y;
uint16_t P[4];
uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
/* 4-color encoding */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 8);
for (x = 0; x < 4; x++)
P[x] = bytestream_get_le16(&s->stream_ptr);
if (!(P[0] & 0x8000)) {
if (!(P[2] & 0x8000)) {
/* 1 of 4 colors for each pixel */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 16);
for (y = 0; y < 8; y++) {
/* get the next set of 8 2-bit flags */
int flags = bytestream_get_le16(&s->stream_ptr);
for (x = 0; x < 8; x++, flags >>= 2)
*pixel_ptr++ = P[flags & 0x03];
pixel_ptr += s->line_inc;
}
} else {
uint32_t flags;
/* 1 of 4 colors for each 2x2 block */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 4);
flags = bytestream_get_le32(&s->stream_ptr);
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x += 2, flags >>= 2) {
pixel_ptr[x ] =
pixel_ptr[x + 1 ] =
pixel_ptr[x + s->stride] =
pixel_ptr[x + 1 + s->stride] = P[flags & 0x03];
}
pixel_ptr += s->stride * 2;
}
}
} else {
uint64_t flags;
/* 1 of 4 colors for each 2x1 or 1x2 block */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 8);
flags = bytestream_get_le64(&s->stream_ptr);
if (!(P[2] & 0x8000)) {
for (y = 0; y < 8; y++) {
for (x = 0; x < 8; x += 2, flags >>= 2) {
pixel_ptr[x ] =
pixel_ptr[x + 1] = P[flags & 0x03];
}
pixel_ptr += s->stride;
}
} else {
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x++, flags >>= 2) {
pixel_ptr[x ] =
pixel_ptr[x + s->stride] = P[flags & 0x03];
}
pixel_ptr += s->stride * 2;
}
}
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xA_16(IpvideoContext *s)
{
int x, y;
uint16_t P[4];
int flags = 0;
uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
/* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
* either top and bottom or left and right halves */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 24);
if (!(AV_RL16(s->stream_ptr) & 0x8000)) {
/* 4-color encoding for each quadrant */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 48);
for (y = 0; y < 16; y++) {
// new values for each 4x4 block
if (!(y & 3)) {
for (x = 0; x < 4; x++)
P[x] = bytestream_get_le16(&s->stream_ptr);
flags = bytestream_get_le32(&s->stream_ptr);
}
for (x = 0; x < 4; x++, flags >>= 2)
*pixel_ptr++ = P[flags & 0x03];
pixel_ptr += s->stride - 4;
// switch to right half
if (y == 7) pixel_ptr -= 8 * s->stride - 4;
}
} else {
// vertical split?
int vert = !(AV_RL16(s->stream_ptr + 16) & 0x8000);
uint64_t flags = 0;
/* 4-color encoding for either left and right or top and bottom
* halves */
for (y = 0; y < 16; y++) {
// load values for each half
if (!(y & 7)) {
for (x = 0; x < 4; x++)
P[x] = bytestream_get_le16(&s->stream_ptr);
flags = bytestream_get_le64(&s->stream_ptr);
}
for (x = 0; x < 4; x++, flags >>= 2)
*pixel_ptr++ = P[flags & 0x03];
if (vert) {
pixel_ptr += s->stride - 4;
// switch to right half
if (y == 7) pixel_ptr -= 8 * s->stride - 4;
} else if (y & 1) pixel_ptr += s->line_inc;
}
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xB_16(IpvideoContext *s)
{
int x, y;
uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
/* 64-color encoding (each pixel in block is a different color) */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 128);
for (y = 0; y < 8; y++) {
for (x = 0; x < 8; x++)
pixel_ptr[x] = bytestream_get_le16(&s->stream_ptr);
pixel_ptr += s->stride;
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xC_16(IpvideoContext *s)
{
int x, y;
uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
/* 16-color block encoding: each 2x2 block is a different color */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 32);
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x += 2) {
pixel_ptr[x ] =
pixel_ptr[x + 1 ] =
pixel_ptr[x + s->stride] =
pixel_ptr[x + 1 + s->stride] = bytestream_get_le16(&s->stream_ptr);
}
pixel_ptr += s->stride * 2;
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xD_16(IpvideoContext *s)
{
int x, y;
uint16_t P[2];
uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
/* 4-color block encoding: each 4x4 block is a different color */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 8);
for (y = 0; y < 8; y++) {
if (!(y & 3)) {
P[0] = bytestream_get_le16(&s->stream_ptr);
P[1] = bytestream_get_le16(&s->stream_ptr);
}
for (x = 0; x < 8; x++)
pixel_ptr[x] = P[x >> 2];
pixel_ptr += s->stride;
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xE_16(IpvideoContext *s)
{
int x, y;
uint16_t pix;
uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
/* 1-color encoding: the whole block is 1 solid color */
CHECK_STREAM_PTR(s->stream_ptr, s->stream_end, 2);
pix = bytestream_get_le16(&s->stream_ptr);
for (y = 0; y < 8; y++) {
for (x = 0; x < 8; x++)
pixel_ptr[x] = pix;
pixel_ptr += s->stride;
}
/* report success */
return 0;
}
static int (* const ipvideo_decode_block[])(IpvideoContext *s) = {
ipvideo_decode_block_opcode_0x0, ipvideo_decode_block_opcode_0x1,
ipvideo_decode_block_opcode_0x2, ipvideo_decode_block_opcode_0x3,
ipvideo_decode_block_opcode_0x4, ipvideo_decode_block_opcode_0x5,
ipvideo_decode_block_opcode_0x6, ipvideo_decode_block_opcode_0x7,
ipvideo_decode_block_opcode_0x8, ipvideo_decode_block_opcode_0x9,
ipvideo_decode_block_opcode_0xA, ipvideo_decode_block_opcode_0xB,
ipvideo_decode_block_opcode_0xC, ipvideo_decode_block_opcode_0xD,
ipvideo_decode_block_opcode_0xE, ipvideo_decode_block_opcode_0xF,
};
static int (* const ipvideo_decode_block16[])(IpvideoContext *s) = {
ipvideo_decode_block_opcode_0x0, ipvideo_decode_block_opcode_0x1,
ipvideo_decode_block_opcode_0x2, ipvideo_decode_block_opcode_0x3,
ipvideo_decode_block_opcode_0x4, ipvideo_decode_block_opcode_0x5,
ipvideo_decode_block_opcode_0x6_16, ipvideo_decode_block_opcode_0x7_16,
ipvideo_decode_block_opcode_0x8_16, ipvideo_decode_block_opcode_0x9_16,
ipvideo_decode_block_opcode_0xA_16, ipvideo_decode_block_opcode_0xB_16,
ipvideo_decode_block_opcode_0xC_16, ipvideo_decode_block_opcode_0xD_16,
ipvideo_decode_block_opcode_0xE_16, ipvideo_decode_block_opcode_0x1,
};
static void ipvideo_decode_opcodes(IpvideoContext *s)
{
int x, y;
unsigned char opcode;
int ret;
static int frame = 0;
GetBitContext gb;
debug_interplay("------------------ frame %d\n", frame);
frame++;
if (!s->is_16bpp) {
/* this is PAL8, so make the palette available */
memcpy(s->current_frame.data[1], s->avctx->palctrl->palette, PALETTE_COUNT * 4);
s->stride = s->current_frame.linesize[0];
s->stream_ptr = s->buf + 14; /* data starts 14 bytes in */
s->stream_end = s->buf + s->size;
} else {
s->stride = s->current_frame.linesize[0] >> 1;
s->stream_ptr = s->buf + 16;
s->stream_end =
s->mv_ptr = s->buf + 14 + AV_RL16(s->buf+14);
s->mv_end = s->buf + s->size;
}
s->line_inc = s->stride - 8;
s->upper_motion_limit_offset = (s->avctx->height - 8) * s->current_frame.linesize[0]
+ (s->avctx->width - 8) * (1 + s->is_16bpp);
init_get_bits(&gb, s->decoding_map, s->decoding_map_size * 8);
for (y = 0; y < s->avctx->height; y += 8) {
for (x = 0; x < s->avctx->width; x += 8) {
opcode = get_bits(&gb, 4);
debug_interplay(" block @ (%3d, %3d): encoding 0x%X, data ptr @ %p\n",
x, y, opcode, s->stream_ptr);
if (!s->is_16bpp) {
s->pixel_ptr = s->current_frame.data[0] + x
+ y*s->current_frame.linesize[0];
ret = ipvideo_decode_block[opcode](s);
} else {
s->pixel_ptr = s->current_frame.data[0] + x*2
+ y*s->current_frame.linesize[0];
ret = ipvideo_decode_block16[opcode](s);
}
if (ret != 0) {
av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode problem on frame %d, @ block (%d, %d)\n",
frame, x, y);
return;
}
}
}
if (s->stream_end - s->stream_ptr > 1) {
av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode finished with %td bytes left over\n",
s->stream_end - s->stream_ptr);
}
}
static av_cold int ipvideo_decode_init(AVCodecContext *avctx)
{
IpvideoContext *s = avctx->priv_data;
s->avctx = avctx;
s->is_16bpp = avctx->bits_per_coded_sample == 16;
avctx->pix_fmt = s->is_16bpp ? PIX_FMT_RGB555 : PIX_FMT_PAL8;
if (!s->is_16bpp && s->avctx->palctrl == NULL) {
av_log(avctx, AV_LOG_ERROR, " Interplay video: palette expected.\n");
return -1;
}
dsputil_init(&s->dsp, avctx);
/* decoding map contains 4 bits of information per 8x8 block */
s->decoding_map_size = avctx->width * avctx->height / (8 * 8 * 2);
s->current_frame.data[0] = s->last_frame.data[0] =
s->second_last_frame.data[0] = NULL;
return 0;
}
static int ipvideo_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
IpvideoContext *s = avctx->priv_data;
AVPaletteControl *palette_control = avctx->palctrl;
/* compressed buffer needs to be large enough to at least hold an entire
* decoding map */
if (buf_size < s->decoding_map_size)
return buf_size;
s->decoding_map = buf;
s->buf = buf + s->decoding_map_size;
s->size = buf_size - s->decoding_map_size;
s->current_frame.reference = 3;
if (avctx->get_buffer(avctx, &s->current_frame)) {
av_log(avctx, AV_LOG_ERROR, " Interplay Video: get_buffer() failed\n");
return -1;
}
ipvideo_decode_opcodes(s);
if (!s->is_16bpp && palette_control->palette_changed) {
palette_control->palette_changed = 0;
s->current_frame.palette_has_changed = 1;
}
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->current_frame;
/* shuffle frames */
if (s->second_last_frame.data[0])
avctx->release_buffer(avctx, &s->second_last_frame);
s->second_last_frame = s->last_frame;
s->last_frame = s->current_frame;
s->current_frame.data[0] = NULL; /* catch any access attempts */
/* report that the buffer was completely consumed */
return buf_size;
}
static av_cold int ipvideo_decode_end(AVCodecContext *avctx)
{
IpvideoContext *s = avctx->priv_data;
/* release the last frame */
if (s->last_frame.data[0])
avctx->release_buffer(avctx, &s->last_frame);
if (s->second_last_frame.data[0])
avctx->release_buffer(avctx, &s->second_last_frame);
return 0;
}
AVCodec interplay_video_decoder = {
"interplayvideo",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_INTERPLAY_VIDEO,
sizeof(IpvideoContext),
ipvideo_decode_init,
NULL,
ipvideo_decode_end,
ipvideo_decode_frame,
CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Interplay MVE video"),
};
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