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ffmpeg/libavcodec/interplayvideo.c

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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
* 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 <string.h>
#include "libavutil/intreadwrite.h"
#define BITSTREAM_READER_LE
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "decode.h"
#include "get_bits.h"
#include "hpeldsp.h"
#define PALETTE_COUNT 256
typedef struct IpvideoContext {
AVCodecContext *avctx;
HpelDSPContext hdsp;
AVFrame *second_last_frame;
AVFrame *last_frame;
/* For format 0x10 */
AVFrame *cur_decode_frame;
AVFrame *prev_decode_frame;
const unsigned char *decoding_map;
int decoding_map_size;
const unsigned char *skip_map;
int skip_map_size;
int is_16bpp;
GetByteContext stream_ptr, mv_ptr;
unsigned char *pixel_ptr;
int line_inc;
int stride;
int upper_motion_limit_offset;
uint32_t pal[256];
} IpvideoContext;
static int copy_from(IpvideoContext *s, AVFrame *src, AVFrame *dst, int delta_x, int delta_y)
{
int width = dst->width;
int current_offset = s->pixel_ptr - dst->data[0];
int x = (current_offset % dst->linesize[0]) / (1 + s->is_16bpp);
int y = current_offset / dst->linesize[0];
int dx = delta_x + x - ((delta_x + x >= width) - (delta_x + x < 0)) * width;
int dy = delta_y + y + (delta_x + x >= width) - (delta_x + x < 0);
int motion_offset = dy * src->linesize[0] + dx * (1 + s->is_16bpp);
if (motion_offset < 0) {
av_log(s->avctx, AV_LOG_ERROR, "motion offset < 0 (%d)\n", motion_offset);
return AVERROR_INVALIDDATA;
} else if (motion_offset > s->upper_motion_limit_offset) {
av_log(s->avctx, AV_LOG_ERROR, "motion offset above limit (%d >= %d)\n",
motion_offset, s->upper_motion_limit_offset);
return AVERROR_INVALIDDATA;
}
if (!src->data[0]) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid decode type, corrupted header?\n");
return AVERROR(EINVAL);
}
s->hdsp.put_pixels_tab[!s->is_16bpp][0](s->pixel_ptr, src->data[0] + motion_offset,
dst->linesize[0], 8);
return 0;
}
static int ipvideo_decode_block_opcode_0x0(IpvideoContext *s, AVFrame *frame)
{
return copy_from(s, s->last_frame, frame, 0, 0);
}
static int ipvideo_decode_block_opcode_0x1(IpvideoContext *s, AVFrame *frame)
{
return copy_from(s, s->second_last_frame, frame, 0, 0);
}
static int ipvideo_decode_block_opcode_0x2(IpvideoContext *s, AVFrame *frame)
{
unsigned char B;
int x, y;
/* copy block from 2 frames ago using a motion vector; need 1 more byte */
if (!s->is_16bpp) {
B = bytestream2_get_byte(&s->stream_ptr);
} else {
B = bytestream2_get_byte(&s->mv_ptr);
}
if (B < 56) {
x = 8 + (B % 7);
y = B / 7;
} else {
x = -14 + ((B - 56) % 29);
y = 8 + ((B - 56) / 29);
}
ff_tlog(s->avctx, "motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
return copy_from(s, s->second_last_frame, frame, x, y);
}
static int ipvideo_decode_block_opcode_0x3(IpvideoContext *s, AVFrame *frame)
{
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) {
B = bytestream2_get_byte(&s->stream_ptr);
} else {
B = bytestream2_get_byte(&s->mv_ptr);
}
if (B < 56) {
x = -(8 + (B % 7));
y = -(B / 7);
} else {
x = -(-14 + ((B - 56) % 29));
y = -( 8 + ((B - 56) / 29));
}
ff_tlog(s->avctx, "motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
return copy_from(s, frame, frame, x, y);
}
static int ipvideo_decode_block_opcode_0x4(IpvideoContext *s, AVFrame *frame)
{
int x, y;
unsigned char B, BL, BH;
/* copy a block from the previous frame; need 1 more byte */
if (!s->is_16bpp) {
B = bytestream2_get_byte(&s->stream_ptr);
} else {
B = bytestream2_get_byte(&s->mv_ptr);
}
BL = B & 0x0F;
BH = (B >> 4) & 0x0F;
x = -8 + BL;
y = -8 + BH;
ff_tlog(s->avctx, "motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
return copy_from(s, s->last_frame, frame, x, y);
}
static int ipvideo_decode_block_opcode_0x5(IpvideoContext *s, AVFrame *frame)
{
signed char x, y;
/* copy a block from the previous frame using an expanded range;
* need 2 more bytes */
x = bytestream2_get_byte(&s->stream_ptr);
y = bytestream2_get_byte(&s->stream_ptr);
ff_tlog(s->avctx, "motion bytes = %d, %d\n", x, y);
return copy_from(s, s->last_frame, frame, x, y);
}
static int ipvideo_decode_block_opcode_0x6(IpvideoContext *s, AVFrame *frame)
{
/* mystery opcode? skip multiple blocks? */
av_log(s->avctx, AV_LOG_ERROR, "Help! Mystery opcode 0x6 seen\n");
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0x7(IpvideoContext *s, AVFrame *frame)
{
int x, y;
unsigned char P[2];
unsigned int flags;
if (bytestream2_get_bytes_left(&s->stream_ptr) < 4) {
av_log(s->avctx, AV_LOG_ERROR, "too little data for opcode 0x7\n");
return AVERROR_INVALIDDATA;
}
/* 2-color encoding */
P[0] = bytestream2_get_byte(&s->stream_ptr);
P[1] = bytestream2_get_byte(&s->stream_ptr);
if (P[0] <= P[1]) {
/* need 8 more bytes from the stream */
for (y = 0; y < 8; y++) {
flags = bytestream2_get_byte(&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 */
flags = bytestream2_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, AVFrame *frame)
{
int x, y;
unsigned char P[4];
unsigned int flags = 0;
if (bytestream2_get_bytes_left(&s->stream_ptr) < 12) {
av_log(s->avctx, AV_LOG_ERROR, "too little data for opcode 0x8\n");
return AVERROR_INVALIDDATA;
}
/* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
* either top and bottom or left and right halves */
P[0] = bytestream2_get_byte(&s->stream_ptr);
P[1] = bytestream2_get_byte(&s->stream_ptr);
if (P[0] <= P[1]) {
for (y = 0; y < 16; y++) {
// new values for each 4x4 block
if (!(y & 3)) {
if (y) {
P[0] = bytestream2_get_byte(&s->stream_ptr);
P[1] = bytestream2_get_byte(&s->stream_ptr);
}
flags = bytestream2_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 {
flags = bytestream2_get_le32(&s->stream_ptr);
P[2] = bytestream2_get_byte(&s->stream_ptr);
P[3] = bytestream2_get_byte(&s->stream_ptr);
if (P[2] <= P[3]) {
/* 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] = P[2];
P[1] = P[3];
flags = bytestream2_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] = P[2];
P[1] = P[3];
flags = bytestream2_get_le32(&s->stream_ptr);
}
for (x = 0; x < 8; x++, 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, AVFrame *frame)
{
int x, y;
unsigned char P[4];
if (bytestream2_get_bytes_left(&s->stream_ptr) < 8) {
av_log(s->avctx, AV_LOG_ERROR, "too little data for opcode 0x9\n");
return AVERROR_INVALIDDATA;
}
/* 4-color encoding */
bytestream2_get_buffer(&s->stream_ptr, P, 4);
if (P[0] <= P[1]) {
if (P[2] <= P[3]) {
/* 1 of 4 colors for each pixel, need 16 more bytes */
for (y = 0; y < 8; y++) {
/* get the next set of 8 2-bit flags */
int flags = bytestream2_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 */
flags = bytestream2_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 */
flags = bytestream2_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, AVFrame *frame)
{
int x, y;
unsigned char P[8];
int flags = 0;
if (bytestream2_get_bytes_left(&s->stream_ptr) < 16) {
av_log(s->avctx, AV_LOG_ERROR, "too little data for opcode 0xA\n");
return AVERROR_INVALIDDATA;
}
bytestream2_get_buffer(&s->stream_ptr, P, 4);
/* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
* either top and bottom or left and right halves */
if (P[0] <= P[1]) {
/* 4-color encoding for each quadrant; need 32 bytes */
for (y = 0; y < 16; y++) {
// new values for each 4x4 block
if (!(y & 3)) {
if (y) bytestream2_get_buffer(&s->stream_ptr, P, 4);
flags = bytestream2_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;
uint64_t flags = bytestream2_get_le64(&s->stream_ptr);
bytestream2_get_buffer(&s->stream_ptr, P + 4, 4);
vert = P[4] <= P[5];
/* 4-color encoding for either left and right or top and bottom
* halves */
for (y = 0; y < 16; y++) {
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;
// load values for second half
if (y == 7) {
memcpy(P, P + 4, 4);
flags = bytestream2_get_le64(&s->stream_ptr);
}
}
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xB(IpvideoContext *s, AVFrame *frame)
{
int y;
/* 64-color encoding (each pixel in block is a different color) */
for (y = 0; y < 8; y++) {
bytestream2_get_buffer(&s->stream_ptr, s->pixel_ptr, 8);
s->pixel_ptr += s->stride;
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xC(IpvideoContext *s, AVFrame *frame)
{
int x, y;
/* 16-color block encoding: each 2x2 block is a different color */
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] = bytestream2_get_byte(&s->stream_ptr);
}
s->pixel_ptr += s->stride * 2;
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xD(IpvideoContext *s, AVFrame *frame)
{
int y;
unsigned char P[2];
if (bytestream2_get_bytes_left(&s->stream_ptr) < 4) {
av_log(s->avctx, AV_LOG_ERROR, "too little data for opcode 0xD\n");
return AVERROR_INVALIDDATA;
}
/* 4-color block encoding: each 4x4 block is a different color */
for (y = 0; y < 8; y++) {
if (!(y & 3)) {
P[0] = bytestream2_get_byte(&s->stream_ptr);
P[1] = bytestream2_get_byte(&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, AVFrame *frame)
{
int y;
unsigned char pix;
/* 1-color encoding: the whole block is 1 solid color */
pix = bytestream2_get_byte(&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, AVFrame *frame)
{
int x, y;
unsigned char sample[2];
/* dithered encoding */
sample[0] = bytestream2_get_byte(&s->stream_ptr);
sample[1] = bytestream2_get_byte(&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, AVFrame *frame)
{
signed char x, y;
/* copy a block from the second last frame using an expanded range */
x = bytestream2_get_byte(&s->stream_ptr);
y = bytestream2_get_byte(&s->stream_ptr);
ff_tlog(s->avctx, "motion bytes = %d, %d\n", x, y);
return copy_from(s, s->second_last_frame, frame, x, y);
}
static int ipvideo_decode_block_opcode_0x7_16(IpvideoContext *s, AVFrame *frame)
{
int x, y;
uint16_t P[2];
unsigned int flags;
uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
/* 2-color encoding */
P[0] = bytestream2_get_le16(&s->stream_ptr);
P[1] = bytestream2_get_le16(&s->stream_ptr);
if (!(P[0] & 0x8000)) {
for (y = 0; y < 8; y++) {
flags = bytestream2_get_byte(&s->stream_ptr) | 0x100;
for (; flags != 1; flags >>= 1)
*pixel_ptr++ = P[flags & 1];
pixel_ptr += s->line_inc;
}
} else {
flags = bytestream2_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, AVFrame *frame)
{
int x, y;
uint16_t P[4];
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 */
P[0] = bytestream2_get_le16(&s->stream_ptr);
P[1] = bytestream2_get_le16(&s->stream_ptr);
if (!(P[0] & 0x8000)) {
for (y = 0; y < 16; y++) {
// new values for each 4x4 block
if (!(y & 3)) {
if (y) {
P[0] = bytestream2_get_le16(&s->stream_ptr);
P[1] = bytestream2_get_le16(&s->stream_ptr);
}
flags = bytestream2_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 {
flags = bytestream2_get_le32(&s->stream_ptr);
P[2] = bytestream2_get_le16(&s->stream_ptr);
P[3] = bytestream2_get_le16(&s->stream_ptr);
if (!(P[2] & 0x8000)) {
/* 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] = P[2];
P[1] = P[3];
flags = bytestream2_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] = P[2];
P[1] = P[3];
flags = bytestream2_get_le32(&s->stream_ptr);
}
for (x = 0; x < 8; x++, 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, AVFrame *frame)
{
int x, y;
uint16_t P[4];
uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
/* 4-color encoding */
for (x = 0; x < 4; x++)
P[x] = bytestream2_get_le16(&s->stream_ptr);
if (!(P[0] & 0x8000)) {
if (!(P[2] & 0x8000)) {
/* 1 of 4 colors for each pixel */
for (y = 0; y < 8; y++) {
/* get the next set of 8 2-bit flags */
int flags = bytestream2_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 */
flags = bytestream2_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 */
flags = bytestream2_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, AVFrame *frame)
{
int x, y;
uint16_t P[8];
int flags = 0;
uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
for (x = 0; x < 4; x++)
P[x] = bytestream2_get_le16(&s->stream_ptr);
/* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
* either top and bottom or left and right halves */
if (!(P[0] & 0x8000)) {
/* 4-color encoding for each quadrant */
for (y = 0; y < 16; y++) {
// new values for each 4x4 block
if (!(y & 3)) {
if (y)
for (x = 0; x < 4; x++)
P[x] = bytestream2_get_le16(&s->stream_ptr);
flags = bytestream2_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;
uint64_t flags = bytestream2_get_le64(&s->stream_ptr);
for (x = 4; x < 8; x++)
P[x] = bytestream2_get_le16(&s->stream_ptr);
vert = !(P[4] & 0x8000);
/* 4-color encoding for either left and right or top and bottom
* halves */
for (y = 0; y < 16; y++) {
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;
// load values for second half
if (y == 7) {
memcpy(P, P + 4, 8);
flags = bytestream2_get_le64(&s->stream_ptr);
}
}
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xB_16(IpvideoContext *s, AVFrame *frame)
{
int x, y;
uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
/* 64-color encoding (each pixel in block is a different color) */
for (y = 0; y < 8; y++) {
for (x = 0; x < 8; x++)
pixel_ptr[x] = bytestream2_get_le16(&s->stream_ptr);
pixel_ptr += s->stride;
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xC_16(IpvideoContext *s, AVFrame *frame)
{
int x, y;
uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
/* 16-color block encoding: each 2x2 block is a different color */
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] = bytestream2_get_le16(&s->stream_ptr);
}
pixel_ptr += s->stride * 2;
}
/* report success */
return 0;
}
static int ipvideo_decode_block_opcode_0xD_16(IpvideoContext *s, AVFrame *frame)
{
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 */
for (y = 0; y < 8; y++) {
if (!(y & 3)) {
P[0] = bytestream2_get_le16(&s->stream_ptr);
P[1] = bytestream2_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, AVFrame *frame)
{
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 */
pix = bytestream2_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, AVFrame *frame) = {
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, AVFrame *frame) = {
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_format_06_firstpass(IpvideoContext *s, AVFrame *frame, int16_t opcode)
{
int line;
if (!opcode) {
for (line = 0; line < 8; ++line) {
bytestream2_get_buffer(&s->stream_ptr, s->pixel_ptr, 8);
s->pixel_ptr += s->stride;
}
} else {
/* Don't try to copy second_last_frame data on the first frames */
if (s->avctx->frame_num > 2)
copy_from(s, s->second_last_frame, frame, 0, 0);
}
}
static void ipvideo_format_06_secondpass(IpvideoContext *s, AVFrame *frame, int16_t opcode)
{
int off_x, off_y;
if (opcode < 0) {
off_x = ((uint16_t)opcode - 0xC000) % frame->width;
off_y = ((uint16_t)opcode - 0xC000) / frame->width;
copy_from(s, s->last_frame, frame, off_x, off_y);
} else if (opcode > 0) {
off_x = ((uint16_t)opcode - 0x4000) % frame->width;
off_y = ((uint16_t)opcode - 0x4000) / frame->width;
copy_from(s, frame, frame, off_x, off_y);
}
}
static void (* const ipvideo_format_06_passes[])(IpvideoContext *s, AVFrame *frame, int16_t op) = {
ipvideo_format_06_firstpass, ipvideo_format_06_secondpass,
};
static void ipvideo_decode_format_06_opcodes(IpvideoContext *s, AVFrame *frame)
{
int pass, x, y;
int16_t opcode;
GetByteContext decoding_map_ptr;
/* this is PAL8, so make the palette available */
memcpy(frame->data[1], s->pal, AVPALETTE_SIZE);
s->stride = frame->linesize[0];
s->line_inc = s->stride - 8;
s->upper_motion_limit_offset = (s->avctx->height - 8) * frame->linesize[0]
+ (s->avctx->width - 8) * (1 + s->is_16bpp);
bytestream2_init(&decoding_map_ptr, s->decoding_map, s->decoding_map_size);
for (pass = 0; pass < 2; ++pass) {
bytestream2_seek(&decoding_map_ptr, 0, SEEK_SET);
for (y = 0; y < s->avctx->height; y += 8) {
for (x = 0; x < s->avctx->width; x += 8) {
opcode = bytestream2_get_le16(&decoding_map_ptr);
ff_tlog(s->avctx,
" block @ (%3d, %3d): opcode 0x%X, data ptr offset %d\n",
x, y, opcode, bytestream2_tell(&s->stream_ptr));
s->pixel_ptr = frame->data[0] + x + y * frame->linesize[0];
ipvideo_format_06_passes[pass](s, frame, opcode);
}
}
}
if (bytestream2_get_bytes_left(&s->stream_ptr) > 1) {
av_log(s->avctx, AV_LOG_DEBUG,
"decode finished with %d bytes left over\n",
bytestream2_get_bytes_left(&s->stream_ptr));
}
}
static void ipvideo_format_10_firstpass(IpvideoContext *s, AVFrame *frame, int16_t opcode)
{
int line;
if (!opcode) {
for (line = 0; line < 8; ++line) {
bytestream2_get_buffer(&s->stream_ptr, s->pixel_ptr, 8);
s->pixel_ptr += s->stride;
}
}
}
static void ipvideo_format_10_secondpass(IpvideoContext *s, AVFrame *frame, int16_t opcode)
{
int off_x, off_y;
if (opcode < 0) {
off_x = ((uint16_t)opcode - 0xC000) % s->cur_decode_frame->width;
off_y = ((uint16_t)opcode - 0xC000) / s->cur_decode_frame->width;
copy_from(s, s->prev_decode_frame, s->cur_decode_frame, off_x, off_y);
} else if (opcode > 0) {
off_x = ((uint16_t)opcode - 0x4000) % s->cur_decode_frame->width;
off_y = ((uint16_t)opcode - 0x4000) / s->cur_decode_frame->width;
copy_from(s, s->cur_decode_frame, s->cur_decode_frame, off_x, off_y);
}
}
static void (* const ipvideo_format_10_passes[])(IpvideoContext *s, AVFrame *frame, int16_t op) = {
ipvideo_format_10_firstpass, ipvideo_format_10_secondpass,
};
static void ipvideo_decode_format_10_opcodes(IpvideoContext *s, AVFrame *frame)
{
int pass, x, y, changed_block;
int16_t opcode, skip;
GetByteContext decoding_map_ptr;
GetByteContext skip_map_ptr;
bytestream2_skip(&s->stream_ptr, 14); /* data starts 14 bytes in */
/* this is PAL8, so make the palette available */
memcpy(frame->data[1], s->pal, AVPALETTE_SIZE);
s->stride = frame->linesize[0];
s->line_inc = s->stride - 8;
s->upper_motion_limit_offset = (s->avctx->height - 8) * frame->linesize[0]
+ (s->avctx->width - 8) * (1 + s->is_16bpp);
bytestream2_init(&decoding_map_ptr, s->decoding_map, s->decoding_map_size);
bytestream2_init(&skip_map_ptr, s->skip_map, s->skip_map_size);
for (pass = 0; pass < 2; ++pass) {
bytestream2_seek(&decoding_map_ptr, 0, SEEK_SET);
bytestream2_seek(&skip_map_ptr, 0, SEEK_SET);
skip = bytestream2_get_le16(&skip_map_ptr);
for (y = 0; y < s->avctx->height; y += 8) {
for (x = 0; x < s->avctx->width; x += 8) {
s->pixel_ptr = s->cur_decode_frame->data[0] + x + y * s->cur_decode_frame->linesize[0];
while (skip <= 0) {
if (skip != -0x8000 && skip) {
opcode = bytestream2_get_le16(&decoding_map_ptr);
ipvideo_format_10_passes[pass](s, frame, opcode);
break;
}
if (bytestream2_get_bytes_left(&skip_map_ptr) < 2)
return;
skip = bytestream2_get_le16(&skip_map_ptr);
}
skip *= 2;
}
}
}
bytestream2_seek(&skip_map_ptr, 0, SEEK_SET);
skip = bytestream2_get_le16(&skip_map_ptr);
for (y = 0; y < s->avctx->height; y += 8) {
for (x = 0; x < s->avctx->width; x += 8) {
changed_block = 0;
s->pixel_ptr = frame->data[0] + x + y*frame->linesize[0];
while (skip <= 0) {
if (skip != -0x8000 && skip) {
changed_block = 1;
break;
}
if (bytestream2_get_bytes_left(&skip_map_ptr) < 2)
return;
skip = bytestream2_get_le16(&skip_map_ptr);
}
if (changed_block) {
copy_from(s, s->cur_decode_frame, frame, 0, 0);
} else {
/* Don't try to copy last_frame data on the first frame */
if (s->avctx->frame_num)
copy_from(s, s->last_frame, frame, 0, 0);
}
skip *= 2;
}
}
FFSWAP(AVFrame*, s->prev_decode_frame, s->cur_decode_frame);
if (bytestream2_get_bytes_left(&s->stream_ptr) > 1) {
av_log(s->avctx, AV_LOG_DEBUG,
"decode finished with %d bytes left over\n",
bytestream2_get_bytes_left(&s->stream_ptr));
}
}
static void ipvideo_decode_format_11_opcodes(IpvideoContext *s, AVFrame *frame)
{
int x, y;
unsigned char opcode;
int ret;
GetBitContext gb;
bytestream2_skip(&s->stream_ptr, 14); /* data starts 14 bytes in */
if (!s->is_16bpp) {
/* this is PAL8, so make the palette available */
memcpy(frame->data[1], s->pal, AVPALETTE_SIZE);
s->stride = frame->linesize[0];
} else {
s->stride = frame->linesize[0] >> 1;
s->mv_ptr = s->stream_ptr;
bytestream2_skip(&s->mv_ptr, bytestream2_get_le16(&s->stream_ptr));
}
s->line_inc = s->stride - 8;
s->upper_motion_limit_offset = (s->avctx->height - 8) * 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) {
if (get_bits_left(&gb) < 4)
return;
opcode = get_bits(&gb, 4);
ff_tlog(s->avctx,
" block @ (%3d, %3d): encoding 0x%X, data ptr offset %d\n",
x, y, opcode, bytestream2_tell(&s->stream_ptr));
if (!s->is_16bpp) {
s->pixel_ptr = frame->data[0] + x
+ y*frame->linesize[0];
ret = ipvideo_decode_block[opcode](s, frame);
} else {
s->pixel_ptr = frame->data[0] + x*2
+ y*frame->linesize[0];
ret = ipvideo_decode_block16[opcode](s, frame);
}
if (ret != 0) {
av_log(s->avctx, AV_LOG_ERROR, "decode problem on frame %"PRId64", @ block (%d, %d)\n",
s->avctx->frame_num, x, y);
return;
}
}
}
if (bytestream2_get_bytes_left(&s->stream_ptr) > 1) {
av_log(s->avctx, AV_LOG_DEBUG,
"decode finished with %d bytes left over\n",
bytestream2_get_bytes_left(&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 ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_PAL8;
ff_hpeldsp_init(&s->hdsp, avctx->flags);
s->last_frame = av_frame_alloc();
s->second_last_frame = av_frame_alloc();
s->cur_decode_frame = av_frame_alloc();
s->prev_decode_frame = av_frame_alloc();
if (!s->last_frame || !s->second_last_frame ||
!s->cur_decode_frame || !s->prev_decode_frame) {
return AVERROR(ENOMEM);
}
s->cur_decode_frame->width = avctx->width;
s->prev_decode_frame->width = avctx->width;
s->cur_decode_frame->height = avctx->height;
s->prev_decode_frame->height = avctx->height;
s->cur_decode_frame->format = avctx->pix_fmt;
s->prev_decode_frame->format = avctx->pix_fmt;
return 0;
}
static int ipvideo_decode_frame(AVCodecContext *avctx, AVFrame *frame,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
IpvideoContext *s = avctx->priv_data;
int ret;
int send_buffer;
int frame_format;
int video_data_size;
if (av_packet_get_side_data(avpkt, AV_PKT_DATA_PARAM_CHANGE, NULL)) {
av_frame_unref(s->last_frame);
av_frame_unref(s->second_last_frame);
av_frame_unref(s->cur_decode_frame);
av_frame_unref(s->prev_decode_frame);
}
if (!s->cur_decode_frame->data[0]) {
ret = ff_get_buffer(avctx, s->cur_decode_frame, 0);
if (ret < 0)
return ret;
ret = ff_get_buffer(avctx, s->prev_decode_frame, 0);
if (ret < 0) {
av_frame_unref(s->cur_decode_frame);
return ret;
}
}
if (buf_size < 8)
return AVERROR_INVALIDDATA;
frame_format = AV_RL8(buf);
send_buffer = AV_RL8(buf + 1);
video_data_size = AV_RL16(buf + 2);
s->decoding_map_size = AV_RL16(buf + 4);
s->skip_map_size = AV_RL16(buf + 6);
switch (frame_format) {
case 0x06:
if (s->decoding_map_size) {
av_log(avctx, AV_LOG_ERROR, "Decoding map for format 0x06\n");
return AVERROR_INVALIDDATA;
}
if (s->skip_map_size) {
av_log(avctx, AV_LOG_ERROR, "Skip map for format 0x06\n");
return AVERROR_INVALIDDATA;
}
if (s->is_16bpp) {
av_log(avctx, AV_LOG_ERROR, "Video format 0x06 does not support 16bpp movies\n");
return AVERROR_INVALIDDATA;
}
/* Decoding map for 0x06 frame format is at the top of pixeldata */
s->decoding_map_size = ((s->avctx->width / 8) * (s->avctx->height / 8)) * 2;
s->decoding_map = buf + 8 + 14; /* 14 bits of op data */
video_data_size -= s->decoding_map_size + 14;
if (video_data_size <= 0 || s->decoding_map_size == 0)
return AVERROR_INVALIDDATA;
if (buf_size < 8 + s->decoding_map_size + 14 + video_data_size)
return AVERROR_INVALIDDATA;
bytestream2_init(&s->stream_ptr, buf + 8 + s->decoding_map_size + 14, video_data_size);
break;
case 0x10:
if (! s->decoding_map_size) {
av_log(avctx, AV_LOG_ERROR, "Empty decoding map for format 0x10\n");
return AVERROR_INVALIDDATA;
}
if (! s->skip_map_size) {
av_log(avctx, AV_LOG_ERROR, "Empty skip map for format 0x10\n");
return AVERROR_INVALIDDATA;
}
if (s->is_16bpp) {
av_log(avctx, AV_LOG_ERROR, "Video format 0x10 does not support 16bpp movies\n");
return AVERROR_INVALIDDATA;
}
if (buf_size < 8 + video_data_size + s->decoding_map_size + s->skip_map_size)
return AVERROR_INVALIDDATA;
bytestream2_init(&s->stream_ptr, buf + 8, video_data_size);
s->decoding_map = buf + 8 + video_data_size;
s->skip_map = buf + 8 + video_data_size + s->decoding_map_size;
break;
case 0x11:
if (! s->decoding_map_size) {
av_log(avctx, AV_LOG_ERROR, "Empty decoding map for format 0x11\n");
return AVERROR_INVALIDDATA;
}
if (s->skip_map_size) {
av_log(avctx, AV_LOG_ERROR, "Skip map for format 0x11\n");
return AVERROR_INVALIDDATA;
}
if (buf_size < 8 + video_data_size + s->decoding_map_size)
return AVERROR_INVALIDDATA;
bytestream2_init(&s->stream_ptr, buf + 8, video_data_size);
s->decoding_map = buf + 8 + video_data_size;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Frame type 0x%02X unsupported\n", frame_format);
}
/* ensure we can't overread the packet */
if (buf_size < 8 + s->decoding_map_size + video_data_size + s->skip_map_size) {
av_log(avctx, AV_LOG_ERROR, "Invalid IP packet size\n");
return AVERROR_INVALIDDATA;
}
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
return ret;
if (!s->is_16bpp) {
#if FF_API_PALETTE_HAS_CHANGED
FF_DISABLE_DEPRECATION_WARNINGS
frame->palette_has_changed =
#endif
ff_copy_palette(s->pal, avpkt, avctx);
#if FF_API_PALETTE_HAS_CHANGED
FF_ENABLE_DEPRECATION_WARNINGS
#endif
}
switch (frame_format) {
case 0x06:
ipvideo_decode_format_06_opcodes(s, frame);
break;
case 0x10:
ipvideo_decode_format_10_opcodes(s, frame);
break;
case 0x11:
ipvideo_decode_format_11_opcodes(s, frame);
break;
}
*got_frame = send_buffer;
/* shuffle frames */
av_frame_unref(s->second_last_frame);
FFSWAP(AVFrame*, s->second_last_frame, s->last_frame);
if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
return ret;
/* report that the buffer was completely consumed */
return buf_size;
}
static av_cold int ipvideo_decode_end(AVCodecContext *avctx)
{
IpvideoContext *s = avctx->priv_data;
av_frame_free(&s->last_frame);
av_frame_free(&s->second_last_frame);
av_frame_free(&s->cur_decode_frame);
av_frame_free(&s->prev_decode_frame);
return 0;
}
const FFCodec ff_interplay_video_decoder = {
.p.name = "interplayvideo",
CODEC_LONG_NAME("Interplay MVE video"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_INTERPLAY_VIDEO,
.priv_data_size = sizeof(IpvideoContext),
.init = ipvideo_decode_init,
.close = ipvideo_decode_end,
FF_CODEC_DECODE_CB(ipvideo_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_PARAM_CHANGE,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};
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