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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 Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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 <stdlib.h>
#include <string.h>
#include "avcodec.h"
#include "bytestream.h"
#include "dsputil.h"
#define BITSTREAM_READER_LE
#include "get_bits.h"
#include "internal.h"
#define PALETTE_COUNT 256
typedef struct IpvideoContext {
AVCodecContext *avctx;
DSPContext dsp;
AVFrame *second_last_frame;
AVFrame *last_frame;
const unsigned char *decoding_map;
int decoding_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 current_offset = s->pixel_ptr - dst->data[0];
int motion_offset = current_offset + delta_y * dst->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 AVERROR_INVALIDDATA;
} 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 AVERROR_INVALIDDATA;
}
if (src->data[0] == NULL) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid decode type, corrupted header?\n");
return AVERROR(EINVAL);
}
s->dsp.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);
}
av_dlog(NULL, " 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));
}
av_dlog(NULL, " 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;
av_dlog(NULL, " 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);
av_dlog(NULL, " 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, " Interplay video: 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;
/* 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;
/* 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];
/* 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;
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];
/* 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);
av_dlog(NULL, " 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_decode_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) {
opcode = get_bits(&gb, 4);
av_dlog(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, " Interplay video: decode problem on frame %d, @ block (%d, %d)\n",
s->avctx->frame_number, x, y);
return;
}
}
}
if (bytestream2_get_bytes_left(&s->stream_ptr) > 1) {
av_log(s->avctx, AV_LOG_ERROR,
"Interplay video: 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_dsputil_init(&s->dsp, avctx);
s->last_frame = av_frame_alloc();
s->second_last_frame = av_frame_alloc();
if (!s->last_frame || !s->second_last_frame) {
av_frame_free(&s->last_frame);
av_frame_free(&s->second_last_frame);
return AVERROR(ENOMEM);
}
return 0;
}
static int ipvideo_decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
IpvideoContext *s = avctx->priv_data;
AVFrame *frame = data;
int ret;
/* decoding map contains 4 bits of information per 8x8 block */
s->decoding_map_size = avctx->width * avctx->height / (8 * 8 * 2);
/* 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;
bytestream2_init(&s->stream_ptr, buf + s->decoding_map_size,
buf_size - s->decoding_map_size);
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) {
av_log(avctx, AV_LOG_ERROR, " Interplay Video: get_buffer() failed\n");
return ret;
}
if (!s->is_16bpp) {
const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
if (pal) {
frame->palette_has_changed = 1;
memcpy(s->pal, pal, AVPALETTE_SIZE);
}
}
ipvideo_decode_opcodes(s, frame);
*got_frame = 1;
/* 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);
return 0;
}
AVCodec ff_interplay_video_decoder = {
.name = "interplayvideo",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_INTERPLAY_VIDEO,
.priv_data_size = sizeof(IpvideoContext),
.init = ipvideo_decode_init,
.close = ipvideo_decode_end,
.decode = ipvideo_decode_frame,
.capabilities = CODEC_CAP_DR1 | CODEC_CAP_PARAM_CHANGE,
.long_name = NULL_IF_CONFIG_SMALL("Interplay MVE video"),
};