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FFmpeg/libavcodec/dxtory.c
Luca Barbato d0f7e4a57f dxtory: Unify and rework the decoding routines 
Do not make many assumption on the dimension of the slices and just
try to decode additional lines if there is enough data left.

Decodes all the samples kindly provided by ultramage.
2015-09-06 14:16:38 +02:00

626 lines
18 KiB
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/*
* Dxtory decoder
*
* Copyright (c) 2011 Konstantin Shishkov
*
* 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
*/
#include <inttypes.h>
#define BITSTREAM_READER_LE
#include "avcodec.h"
#include "bytestream.h"
#include "get_bits.h"
#include "internal.h"
#include "unary.h"
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
static int dxtory_decode_v1_rgb(AVCodecContext *avctx, AVFrame *pic,
const uint8_t *src, int src_size,
int id, int bpp)
{
int h;
uint8_t *dst;
int ret;
if (src_size < avctx->width * avctx->height * bpp) {
av_log(avctx, AV_LOG_ERROR, "packet too small\n");
return AVERROR_INVALIDDATA;
}
avctx->pix_fmt = id;
if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
return ret;
dst = pic->data[0];
for (h = 0; h < avctx->height; h++) {
memcpy(dst, src, avctx->width * bpp);
src += avctx->width * bpp;
dst += pic->linesize[0];
}
return 0;
}
static int dxtory_decode_v1_410(AVCodecContext *avctx, AVFrame *pic,
const uint8_t *src, int src_size)
{
int h, w;
uint8_t *Y1, *Y2, *Y3, *Y4, *U, *V;
int ret;
if (src_size < avctx->width * avctx->height * 18 / 16) {
av_log(avctx, AV_LOG_ERROR, "packet too small\n");
return AVERROR_INVALIDDATA;
}
avctx->pix_fmt = AV_PIX_FMT_YUV410P;
if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
return ret;
Y1 = pic->data[0];
Y2 = pic->data[0] + pic->linesize[0];
Y3 = pic->data[0] + pic->linesize[0] * 2;
Y4 = pic->data[0] + pic->linesize[0] * 3;
U = pic->data[1];
V = pic->data[2];
for (h = 0; h < avctx->height; h += 4) {
for (w = 0; w < avctx->width; w += 4) {
AV_COPY32(Y1 + w, src);
AV_COPY32(Y2 + w, src + 4);
AV_COPY32(Y3 + w, src + 8);
AV_COPY32(Y4 + w, src + 12);
U[w >> 2] = src[16] + 0x80;
V[w >> 2] = src[17] + 0x80;
src += 18;
}
Y1 += pic->linesize[0] << 2;
Y2 += pic->linesize[0] << 2;
Y3 += pic->linesize[0] << 2;
Y4 += pic->linesize[0] << 2;
U += pic->linesize[1];
V += pic->linesize[2];
}
return 0;
}
static int dxtory_decode_v1_420(AVCodecContext *avctx, AVFrame *pic,
const uint8_t *src, int src_size)
{
int h, w;
uint8_t *Y1, *Y2, *U, *V;
int ret;
if (src_size < avctx->width * avctx->height * 3 / 2) {
av_log(avctx, AV_LOG_ERROR, "packet too small\n");
return AVERROR_INVALIDDATA;
}
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
return ret;
Y1 = pic->data[0];
Y2 = pic->data[0] + pic->linesize[0];
U = pic->data[1];
V = pic->data[2];
for (h = 0; h < avctx->height; h += 2) {
for (w = 0; w < avctx->width; w += 2) {
AV_COPY16(Y1 + w, src);
AV_COPY16(Y2 + w, src + 2);
U[w >> 1] = src[4] + 0x80;
V[w >> 1] = src[5] + 0x80;
src += 6;
}
Y1 += pic->linesize[0] << 1;
Y2 += pic->linesize[0] << 1;
U += pic->linesize[1];
V += pic->linesize[2];
}
return 0;
}
static int dxtory_decode_v1_444(AVCodecContext *avctx, AVFrame *pic,
const uint8_t *src, int src_size)
{
int h, w;
uint8_t *Y, *U, *V;
int ret;
if (src_size < avctx->width * avctx->height * 3) {
av_log(avctx, AV_LOG_ERROR, "packet too small\n");
return AVERROR_INVALIDDATA;
}
avctx->pix_fmt = AV_PIX_FMT_YUV444P;
if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
return ret;
Y = pic->data[0];
U = pic->data[1];
V = pic->data[2];
for (h = 0; h < avctx->height; h++) {
for (w = 0; w < avctx->width; w++) {
Y[w] = *src++;
U[w] = *src++ ^ 0x80;
V[w] = *src++ ^ 0x80;
}
Y += pic->linesize[0];
U += pic->linesize[1];
V += pic->linesize[2];
}
return 0;
}
const uint8_t def_lru[8] = { 0x00, 0x20, 0x40, 0x60, 0x80, 0xA0, 0xC0, 0xFF };
const uint8_t def_lru_555[8] = { 0x00, 0x08, 0x10, 0x18, 0x1F };
const uint8_t def_lru_565[8] = { 0x00, 0x08, 0x10, 0x20, 0x30, 0x3F };
static inline uint8_t decode_sym(GetBitContext *gb, uint8_t lru[8])
{
uint8_t c, val;
c = get_unary(gb, 0, 8);
if (!c) {
val = get_bits(gb, 8);
memmove(lru + 1, lru, sizeof(*lru) * (8 - 1));
} else {
val = lru[c - 1];
memmove(lru + 1, lru, sizeof(*lru) * (c - 1));
}
lru[0] = val;
return val;
}
static int check_slice_size(AVCodecContext *avctx,
const uint8_t *src, int src_size,
int slice_size, int off)
{
int cur_slice_size;
if (slice_size > src_size - off) {
av_log(avctx, AV_LOG_ERROR,
"invalid slice size %"PRIu32" (only %"PRIu32" bytes left)\n",
slice_size, src_size - off);
return AVERROR_INVALIDDATA;
}
if (slice_size <= 16) {
av_log(avctx, AV_LOG_ERROR, "invalid slice size %"PRIu32"\n",
slice_size);
return AVERROR_INVALIDDATA;
}
cur_slice_size = AV_RL32(src + off);
if (cur_slice_size != slice_size - 16) {
av_log(avctx, AV_LOG_ERROR,
"Slice sizes mismatch: got %"PRIu32" instead of %"PRIu32"\n",
cur_slice_size, slice_size - 16);
}
return 0;
}
static int load_buffer(AVCodecContext *avctx,
const uint8_t *src, int src_size,
GetByteContext *gb,
int *nslices, int *off)
{
bytestream2_init(gb, src, src_size);
*nslices = bytestream2_get_le16(gb);
*off = FFALIGN(*nslices * 4 + 2, 16);
if (src_size < *off) {
av_log(avctx, AV_LOG_ERROR, "no slice data\n");
return AVERROR_INVALIDDATA;
}
if (!*nslices) {
avpriv_request_sample(avctx, "%d slices for %dx%d", *nslices,
avctx->width, avctx->height);
return AVERROR_PATCHWELCOME;
}
return 0;
}
static inline uint8_t decode_sym_565(GetBitContext *gb, uint8_t lru[8],
int bits)
{
uint8_t c, val;
c = get_unary(gb, 0, bits);
if (!c) {
val = get_bits(gb, bits);
memmove(lru + 1, lru, sizeof(*lru) * (6 - 1));
} else {
val = lru[c - 1];
memmove(lru + 1, lru, sizeof(*lru) * (c - 1));
}
lru[0] = val;
return val;
}
typedef int (*decode_slice_func)(GetBitContext *gb, AVFrame *frame,
int line, int height, uint8_t lru[3][8]);
typedef void (*setup_lru_func)(uint8_t lru[3][8]);
static int dxtory_decode_v2(AVCodecContext *avctx, AVFrame *pic,
const uint8_t *src, int src_size,
decode_slice_func decode_slice,
setup_lru_func setup_lru,
enum AVPixelFormat fmt)
{
GetByteContext gb;
GetBitContext gb2;
int nslices, slice, line = 0;
uint32_t off, slice_size;
uint8_t lru[3][8];
int ret;
ret = load_buffer(avctx, src, src_size, &gb, &nslices, &off);
if (ret < 0)
return ret;
avctx->pix_fmt = fmt;
if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
return ret;
for (slice = 0; slice < nslices; slice++) {
slice_size = bytestream2_get_le32(&gb);
setup_lru(lru);
ret = check_slice_size(avctx, src, src_size, slice_size, off);
if (ret < 0)
return ret;
init_get_bits(&gb2, src + off + 16, (slice_size - 16) * 8);
line += decode_slice(&gb2, pic, line, avctx->height - line, lru);
off += slice_size;
}
if (avctx->height - line) {
av_log(avctx, AV_LOG_VERBOSE,
"Not enough slice data available, "
"cropping the frame by %d pixels\n",
avctx->height - line);
avctx->height = line;
}
return 0;
}
av_always_inline
static int dx2_decode_slice_5x5(GetBitContext *gb, AVFrame *frame,
int line, int left, uint8_t lru[3][8],
int is_565)
{
int x, y;
int r, g, b;
int width = frame->width;
int stride = frame->linesize[0];
uint8_t *dst = frame->data[0] + stride * line;
for (y = 0; y < left && get_bits_left(gb) > 16; y++) {
for (x = 0; x < width; x++) {
b = decode_sym_565(gb, lru[0], 5);
g = decode_sym_565(gb, lru[1], is_565 ? 6 : 5);
r = decode_sym_565(gb, lru[2], 5);
dst[x * 3 + 0] = (r << 3) | (r >> 2);
dst[x * 3 + 1] = is_565 ? (g << 2) | (g >> 4) : (g << 3) | (g >> 2);
dst[x * 3 + 2] = (b << 3) | (b >> 2);
}
dst += stride;
}
return y;
}
static void setup_lru_555(uint8_t lru[3][8])
{
memcpy(lru[0], def_lru_555, 8 * sizeof(*def_lru));
memcpy(lru[1], def_lru_555, 8 * sizeof(*def_lru));
memcpy(lru[2], def_lru_555, 8 * sizeof(*def_lru));
}
static void setup_lru_565(uint8_t lru[3][8])
{
memcpy(lru[0], def_lru_555, 8 * sizeof(*def_lru));
memcpy(lru[1], def_lru_565, 8 * sizeof(*def_lru));
memcpy(lru[2], def_lru_555, 8 * sizeof(*def_lru));
}
static int dx2_decode_slice_555(GetBitContext *gb, AVFrame *frame,
int line, int left, uint8_t lru[3][8])
{
return dx2_decode_slice_5x5(gb, frame, line, left, lru, 0);
}
static int dx2_decode_slice_565(GetBitContext *gb, AVFrame *frame,
int line, int left, uint8_t lru[3][8])
{
return dx2_decode_slice_5x5(gb, frame, line, left, lru, 1);
}
static int dxtory_decode_v2_565(AVCodecContext *avctx, AVFrame *pic,
const uint8_t *src, int src_size, int is_565)
{
enum AVPixelFormat fmt = AV_PIX_FMT_RGB24;
if (is_565)
return dxtory_decode_v2(avctx, pic, src, src_size,
dx2_decode_slice_565,
setup_lru_565,
fmt);
else
return dxtory_decode_v2(avctx, pic, src, src_size,
dx2_decode_slice_555,
setup_lru_555,
fmt);
}
static int dx2_decode_slice_rgb(GetBitContext *gb, AVFrame *frame,
int line, int left, uint8_t lru[3][8])
{
int x, y;
int width = frame->width;
int stride = frame->linesize[0];
uint8_t *dst = frame->data[0] + stride * line;
for (y = 0; y < left && get_bits_left(gb) > 16; y++) {
for (x = 0; x < width; x++) {
dst[x * 3 + 0] = decode_sym(gb, lru[0]);
dst[x * 3 + 1] = decode_sym(gb, lru[1]);
dst[x * 3 + 2] = decode_sym(gb, lru[2]);
}
dst += stride;
}
return y;
}
static void default_setup_lru(uint8_t lru[3][8])
{
int i;
for (i = 0; i < 3; i++)
memcpy(lru[i], def_lru, 8 * sizeof(*def_lru));
}
static int dxtory_decode_v2_rgb(AVCodecContext *avctx, AVFrame *pic,
const uint8_t *src, int src_size)
{
return dxtory_decode_v2(avctx, pic, src, src_size,
dx2_decode_slice_rgb,
default_setup_lru,
AV_PIX_FMT_BGR24);
}
static int dx2_decode_slice_410(GetBitContext *gb, AVFrame *frame,
int line, int left,
uint8_t lru[3][8])
{
int x, y, i, j;
int width = frame->width;
int ystride = frame->linesize[0];
int ustride = frame->linesize[1];
int vstride = frame->linesize[2];
uint8_t *Y = frame->data[0] + ystride * line;
uint8_t *U = frame->data[1] + (ustride >> 2) * line;
uint8_t *V = frame->data[2] + (vstride >> 2) * line;
for (y = 0; y < left - 3 && get_bits_left(gb) > 16; y += 4) {
for (x = 0; x < width; x += 4) {
for (j = 0; j < 4; j++)
for (i = 0; i < 4; i++)
Y[x + i + j * ystride] = decode_sym(gb, lru[0]);
U[x >> 2] = decode_sym(gb, lru[1]) ^ 0x80;
V[x >> 2] = decode_sym(gb, lru[2]) ^ 0x80;
}
Y += ystride << 2;
U += ustride;
V += vstride;
}
return y;
}
static int dxtory_decode_v2_410(AVCodecContext *avctx, AVFrame *pic,
const uint8_t *src, int src_size)
{
return dxtory_decode_v2(avctx, pic, src, src_size,
dx2_decode_slice_410,
default_setup_lru,
AV_PIX_FMT_YUV410P);
}
static int dx2_decode_slice_420(GetBitContext *gb, AVFrame *frame,
int line, int left,
uint8_t lru[3][8])
{
int x, y;
int width = frame->width;
int ystride = frame->linesize[0];
int ustride = frame->linesize[1];
int vstride = frame->linesize[2];
uint8_t *Y = frame->data[0] + ystride * line;
uint8_t *U = frame->data[1] + (ustride >> 1) * line;
uint8_t *V = frame->data[2] + (vstride >> 1) * line;
for (y = 0; y < left - 1 && get_bits_left(gb) > 16; y += 2) {
for (x = 0; x < width; x += 2) {
Y[x + 0 + 0 * ystride] = decode_sym(gb, lru[0]);
Y[x + 1 + 0 * ystride] = decode_sym(gb, lru[0]);
Y[x + 0 + 1 * ystride] = decode_sym(gb, lru[0]);
Y[x + 1 + 1 * ystride] = decode_sym(gb, lru[0]);
U[x >> 1] = decode_sym(gb, lru[1]) ^ 0x80;
V[x >> 1] = decode_sym(gb, lru[2]) ^ 0x80;
}
Y += ystride << 1;
U += ustride;
V += vstride;
}
return y;
}
static int dxtory_decode_v2_420(AVCodecContext *avctx, AVFrame *pic,
const uint8_t *src, int src_size)
{
return dxtory_decode_v2(avctx, pic, src, src_size,
dx2_decode_slice_420,
default_setup_lru,
AV_PIX_FMT_YUV420P);
}
static int dx2_decode_slice_444(GetBitContext *gb, AVFrame *frame,
int line, int left,
uint8_t lru[3][8])
{
int x, y;
int width = frame->width;
int ystride = frame->linesize[0];
int ustride = frame->linesize[1];
int vstride = frame->linesize[2];
uint8_t *Y = frame->data[0] + ystride * line;
uint8_t *U = frame->data[1] + ustride * line;
uint8_t *V = frame->data[2] + vstride * line;
for (y = 0; y < left && get_bits_left(gb) > 16; y++) {
for (x = 0; x < width; x++) {
Y[x] = decode_sym(gb, lru[0]);
U[x] = decode_sym(gb, lru[1]) ^ 0x80;
V[x] = decode_sym(gb, lru[2]) ^ 0x80;
}
Y += ystride;
U += ustride;
V += vstride;
}
return y;
}
static int dxtory_decode_v2_444(AVCodecContext *avctx, AVFrame *pic,
const uint8_t *src, int src_size)
{
return dxtory_decode_v2(avctx, pic, src, src_size,
dx2_decode_slice_444,
default_setup_lru,
AV_PIX_FMT_YUV444P);
}
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
AVPacket *avpkt)
{
AVFrame *pic = data;
const uint8_t *src = avpkt->data;
int ret;
if (avpkt->size < 16) {
av_log(avctx, AV_LOG_ERROR, "packet too small\n");
return AVERROR_INVALIDDATA;
}
switch (AV_RB32(src)) {
case 0x01000001:
ret = dxtory_decode_v1_rgb(avctx, pic, src + 16, avpkt->size - 16,
AV_PIX_FMT_BGR24, 3);
break;
case 0x01000009:
ret = dxtory_decode_v2_rgb(avctx, pic, src + 16, avpkt->size - 16);
break;
case 0x02000001:
ret = dxtory_decode_v1_420(avctx, pic, src + 16, avpkt->size - 16);
break;
case 0x02000009:
ret = dxtory_decode_v2_420(avctx, pic, src + 16, avpkt->size - 16);
break;
case 0x03000001:
ret = dxtory_decode_v1_410(avctx, pic, src + 16, avpkt->size - 16);
break;
case 0x03000009:
ret = dxtory_decode_v2_410(avctx, pic, src + 16, avpkt->size - 16);
break;
case 0x04000001:
ret = dxtory_decode_v1_444(avctx, pic, src + 16, avpkt->size - 16);
break;
case 0x04000009:
ret = dxtory_decode_v2_444(avctx, pic, src + 16, avpkt->size - 16);
break;
case 0x17000001:
ret = dxtory_decode_v1_rgb(avctx, pic, src + 16, avpkt->size - 16,
AV_PIX_FMT_RGB565LE, 2);
break;
case 0x17000009:
ret = dxtory_decode_v2_565(avctx, pic, src + 16, avpkt->size - 16, 1);
break;
case 0x18000001:
case 0x19000001:
ret = dxtory_decode_v1_rgb(avctx, pic, src + 16, avpkt->size - 16,
AV_PIX_FMT_RGB555LE, 2);
break;
case 0x18000009:
case 0x19000009:
ret = dxtory_decode_v2_565(avctx, pic, src + 16, avpkt->size - 16, 0);
break;
default:
avpriv_request_sample(avctx, "Frame header %"PRIX32, AV_RB32(src));
return AVERROR_PATCHWELCOME;
}
if (ret)
return ret;
pic->pict_type = AV_PICTURE_TYPE_I;
pic->key_frame = 1;
*got_frame = 1;
return avpkt->size;
}
AVCodec ff_dxtory_decoder = {
.name = "dxtory",
.long_name = NULL_IF_CONFIG_SMALL("Dxtory"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_DXTORY,
.decode = decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
};
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