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FFmpeg/libavcodec/tdsc.c

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/*
* TDSC decoder
* Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
*
* 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
* TDSC decoder
*
* Fourcc: TSDC
*
* TDSC is very simple. It codes picture by tiles, storing them in raw BGR24
* format or compressing them in JPEG. Frames can be full pictures or just
* updates to the previous frame. Cursor is found in its own frame or at the
* bottom of the picture. Every frame is then packed with zlib.
*
* Supports: BGR24
*/
#include <stdint.h>
#include <zlib.h>
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#define BITMAPINFOHEADER_SIZE 0x28
#define TDSF_HEADER_SIZE 0x56
#define TDSB_HEADER_SIZE 0x08
typedef struct TDSCContext {
AVCodecContext *jpeg_avctx; // wrapper context for MJPEG
int width, height;
GetByteContext gbc;
AVFrame *refframe; // full decoded frame (without cursor)
AVFrame *jpgframe; // decoded JPEG tile
uint8_t *tilebuffer; // buffer containing tile data
/* zlib interaction */
uint8_t *deflatebuffer;
uLongf deflatelen;
/* All that is cursor */
uint8_t *cursor;
int cursor_stride;
int cursor_w, cursor_h, cursor_x, cursor_y;
int cursor_hot_x, cursor_hot_y;
} TDSCContext;
/* 1 byte bits, 1 byte planes, 2 bytes format (probably) */
enum TDSCCursorFormat {
CUR_FMT_MONO = 0x01010004,
CUR_FMT_BGRA = 0x20010004,
CUR_FMT_RGBA = 0x20010008,
};
static av_cold int tdsc_close(AVCodecContext *avctx)
{
TDSCContext *ctx = avctx->priv_data;
av_frame_free(&ctx->refframe);
av_frame_free(&ctx->jpgframe);
av_freep(&ctx->deflatebuffer);
av_freep(&ctx->tilebuffer);
av_freep(&ctx->cursor);
avcodec_free_context(&ctx->jpeg_avctx);
return 0;
}
static av_cold int tdsc_init(AVCodecContext *avctx)
{
TDSCContext *ctx = avctx->priv_data;
const AVCodec *codec;
int ret;
avctx->pix_fmt = AV_PIX_FMT_BGR24;
/* These needs to be set to estimate buffer and frame size */
if (!(avctx->width && avctx->height)) {
av_log(avctx, AV_LOG_ERROR, "Video size not set.\n");
return AVERROR_INVALIDDATA;
}
/* This value should be large enough for a RAW-only frame plus headers */
ctx->deflatelen = avctx->width * avctx->height * (3 + 1);
ret = av_reallocp(&ctx->deflatebuffer, ctx->deflatelen);
if (ret < 0)
return ret;
/* Allocate reference and JPEG frame */
ctx->refframe = av_frame_alloc();
ctx->jpgframe = av_frame_alloc();
if (!ctx->refframe || !ctx->jpgframe)
return AVERROR(ENOMEM);
/* Prepare everything needed for JPEG decoding */
codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG);
if (!codec)
return AVERROR_BUG;
ctx->jpeg_avctx = avcodec_alloc_context3(codec);
if (!ctx->jpeg_avctx)
return AVERROR(ENOMEM);
ctx->jpeg_avctx->flags = avctx->flags;
ctx->jpeg_avctx->flags2 = avctx->flags2;
ctx->jpeg_avctx->dct_algo = avctx->dct_algo;
ctx->jpeg_avctx->idct_algo = avctx->idct_algo;;
ret = avcodec_open2(ctx->jpeg_avctx, codec, NULL);
if (ret < 0)
return ret;
/* Set the output pixel format on the reference frame */
ctx->refframe->format = avctx->pix_fmt;
return 0;
}
#define APPLY_ALPHA(src, new, alpha) \
src = (src * (256 - alpha) + new * alpha) >> 8
/* Paint a region over a buffer, without drawing out of its bounds. */
static void tdsc_paint_cursor(AVCodecContext *avctx, uint8_t *dst, int stride)
{
TDSCContext *ctx = avctx->priv_data;
const uint8_t *cursor = ctx->cursor;
int x = ctx->cursor_x - ctx->cursor_hot_x;
int y = ctx->cursor_y - ctx->cursor_hot_y;
int w = ctx->cursor_w;
int h = ctx->cursor_h;
int i, j;
if (!ctx->cursor)
return;
if (x + w > ctx->width)
w = ctx->width - x;
if (y + h > ctx->height)
h = ctx->height - y;
if (x < 0) {
w += x;
cursor += -x * 4;
} else {
dst += x * 3;
}
if (y < 0) {
h += y;
cursor += -y * ctx->cursor_stride;
} else {
dst += y * stride;
}
if (w < 0 || h < 0)
return;
for (j = 0; j < h; j++) {
for (i = 0; i < w; i++) {
uint8_t alpha = cursor[i * 4];
APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
}
dst += stride;
cursor += ctx->cursor_stride;
}
}
/* Load cursor data and store it in ABGR mode. */
static int tdsc_load_cursor(AVCodecContext *avctx)
{
TDSCContext *ctx = avctx->priv_data;
int i, j, k, ret, bits, cursor_fmt;
uint8_t *dst;
ctx->cursor_hot_x = bytestream2_get_le16(&ctx->gbc);
ctx->cursor_hot_y = bytestream2_get_le16(&ctx->gbc);
ctx->cursor_w = bytestream2_get_le16(&ctx->gbc);
ctx->cursor_h = bytestream2_get_le16(&ctx->gbc);
ctx->cursor_stride = FFALIGN(ctx->cursor_w, 32) * 4;
cursor_fmt = bytestream2_get_le32(&ctx->gbc);
if (ctx->cursor_x >= avctx->width || ctx->cursor_y >= avctx->height) {
av_log(avctx, AV_LOG_ERROR,
"Invalid cursor position (%d.%d outside %dx%d).\n",
ctx->cursor_x, ctx->cursor_y, avctx->width, avctx->height);
return AVERROR_INVALIDDATA;
}
if (ctx->cursor_w < 1 || ctx->cursor_w > 256 ||
ctx->cursor_h < 1 || ctx->cursor_h > 256) {
av_log(avctx, AV_LOG_ERROR,
"Invalid cursor dimensions %dx%d.\n",
ctx->cursor_w, ctx->cursor_h);
return AVERROR_INVALIDDATA;
}
if (ctx->cursor_hot_x > ctx->cursor_w ||
ctx->cursor_hot_y > ctx->cursor_h) {
av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %d.%d.\n",
ctx->cursor_hot_x, ctx->cursor_hot_y);
ctx->cursor_hot_x = FFMIN(ctx->cursor_hot_x, ctx->cursor_w - 1);
ctx->cursor_hot_y = FFMIN(ctx->cursor_hot_y, ctx->cursor_h - 1);
}
ret = av_reallocp(&ctx->cursor, ctx->cursor_stride * ctx->cursor_h);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer.\n");
return ret;
}
dst = ctx->cursor;
/* here data is packed in BE */
switch (cursor_fmt) {
case CUR_FMT_MONO:
for (j = 0; j < ctx->cursor_h; j++) {
for (i = 0; i < ctx->cursor_w; i += 32) {
bits = bytestream2_get_be32(&ctx->gbc);
for (k = 0; k < 32; k++) {
dst[0] = !!(bits & 0x80000000);
dst += 4;
bits <<= 1;
}
}
dst += ctx->cursor_stride - ctx->cursor_w * 4;
}
dst = ctx->cursor;
for (j = 0; j < ctx->cursor_h; j++) {
for (i = 0; i < ctx->cursor_w; i += 32) {
bits = bytestream2_get_be32(&ctx->gbc);
for (k = 0; k < 32; k++) {
int mask_bit = !!(bits & 0x80000000);
switch (dst[0] * 2 + mask_bit) {
case 0:
dst[0] = 0xFF;
dst[1] = 0x00;
dst[2] = 0x00;
dst[3] = 0x00;
break;
case 1:
dst[0] = 0xFF;
dst[1] = 0xFF;
dst[2] = 0xFF;
dst[3] = 0xFF;
break;
default:
dst[0] = 0x00;
dst[1] = 0x00;
dst[2] = 0x00;
dst[3] = 0x00;
}
dst += 4;
bits <<= 1;
}
}
dst += ctx->cursor_stride - ctx->cursor_w * 4;
}
break;
case CUR_FMT_BGRA:
case CUR_FMT_RGBA:
/* Skip monochrome version of the cursor */
bytestream2_skip(&ctx->gbc,
ctx->cursor_h * (FFALIGN(ctx->cursor_w, 32) >> 3));
if (cursor_fmt & 8) { // RGBA -> ABGR
for (j = 0; j < ctx->cursor_h; j++) {
for (i = 0; i < ctx->cursor_w; i++) {
int val = bytestream2_get_be32(&ctx->gbc);
*dst++ = val >> 24;
*dst++ = val >> 16;
*dst++ = val >> 8;
*dst++ = val >> 0;
}
dst += ctx->cursor_stride - ctx->cursor_w * 4;
}
} else { // BGRA -> ABGR
for (j = 0; j < ctx->cursor_h; j++) {
for (i = 0; i < ctx->cursor_w; i++) {
int val = bytestream2_get_be32(&ctx->gbc);
*dst++ = val >> 0;
*dst++ = val >> 24;
*dst++ = val >> 16;
*dst++ = val >> 8;
}
dst += ctx->cursor_stride - ctx->cursor_w * 4;
}
}
break;
default:
avpriv_request_sample(avctx, "Cursor format %08x", cursor_fmt);
return AVERROR_PATCHWELCOME;
}
return 0;
}
/* Convert a single YUV pixel to RGB. */
static inline void tdsc_yuv2rgb(uint8_t *out, int Y, int U, int V)
{
out[0] = av_clip_uint8(Y + ( 91881 * V + 32768 >> 16));
out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
out[2] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
}
/* Convert a YUV420 buffer to a RGB buffer. */
static av_always_inline void tdsc_blit(uint8_t *dst, int dst_stride,
const uint8_t *srcy, int srcy_stride,
const uint8_t *srcu, const uint8_t *srcv,
int srcuv_stride, int width, int height)
{
int col, line;
for (line = 0; line < height; line++) {
for (col = 0; col < width; col++)
tdsc_yuv2rgb(dst + col * 3, srcy[col],
srcu[col >> 1] - 128, srcv[col >> 1] - 128);
dst += dst_stride;
srcy += srcy_stride;
srcu += srcuv_stride * (line & 1);
srcv += srcuv_stride * (line & 1);
}
}
/* Invoke the MJPEG decoder to decode the tile. */
static int tdsc_decode_jpeg_tile(AVCodecContext *avctx, int tile_size,
int x, int y, int w, int h)
{
TDSCContext *ctx = avctx->priv_data;
AVPacket jpkt;
int ret;
/* Prepare a packet and send to the MJPEG decoder */
av_init_packet(&jpkt);
jpkt.data = ctx->tilebuffer;
jpkt.size = tile_size;
ret = avcodec_send_packet(ctx->jpeg_avctx, &jpkt);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
return ret;
}
ret = avcodec_receive_frame(ctx->jpeg_avctx, ctx->jpgframe);
if (ret < 0 || ctx->jpgframe->format != AV_PIX_FMT_YUVJ420P) {
av_log(avctx, AV_LOG_ERROR,
"JPEG decoding error (%d).\n", ret);
/* Normally skip, error if explode */
if (avctx->err_recognition & AV_EF_EXPLODE)
return AVERROR_INVALIDDATA;
else
return 0;
}
/* Let's paint onto the buffer */
tdsc_blit(ctx->refframe->data[0] + x * 3 + ctx->refframe->linesize[0] * y,
ctx->refframe->linesize[0],
ctx->jpgframe->data[0], ctx->jpgframe->linesize[0],
ctx->jpgframe->data[1], ctx->jpgframe->data[2],
ctx->jpgframe->linesize[1], w, h);
av_frame_unref(ctx->jpgframe);
return 0;
}
/* Parse frame and either copy data or decode JPEG. */
static int tdsc_decode_tiles(AVCodecContext *avctx, int number_tiles)
{
TDSCContext *ctx = avctx->priv_data;
int i;
/* Iterate over the number of tiles */
for (i = 0; i < number_tiles; i++) {
int tile_size;
int tile_mode;
int x, y, w, h;
int ret;
if (bytestream2_get_bytes_left(&ctx->gbc) < 4 ||
bytestream2_get_le32(&ctx->gbc) != MKTAG('T','D','S','B') ||
bytestream2_get_bytes_left(&ctx->gbc) < TDSB_HEADER_SIZE - 4) {
av_log(avctx, AV_LOG_ERROR, "TDSB tag is too small.\n");
return AVERROR_INVALIDDATA;
}
tile_size = bytestream2_get_le32(&ctx->gbc);
if (bytestream2_get_bytes_left(&ctx->gbc) < tile_size)
return AVERROR_INVALIDDATA;
tile_mode = bytestream2_get_le32(&ctx->gbc);
bytestream2_skip(&ctx->gbc, 4); // unknown
x = bytestream2_get_le32(&ctx->gbc);
y = bytestream2_get_le32(&ctx->gbc);
w = bytestream2_get_le32(&ctx->gbc) - x;
h = bytestream2_get_le32(&ctx->gbc) - y;
if (x >= ctx->width || y >= ctx->height) {
av_log(avctx, AV_LOG_ERROR,
"Invalid tile position (%d.%d outside %dx%d).\n",
x, y, ctx->width, ctx->height);
return AVERROR_INVALIDDATA;
}
if (x + w > ctx->width || y + h > ctx->height) {
av_log(avctx, AV_LOG_ERROR,
"Invalid tile size %dx%d\n", w, h);
return AVERROR_INVALIDDATA;
}
ret = av_reallocp(&ctx->tilebuffer, tile_size);
if (!ctx->tilebuffer)
return ret;
bytestream2_get_buffer(&ctx->gbc, ctx->tilebuffer, tile_size);
if (tile_mode == MKTAG('G','E','P','J')) {
/* Decode JPEG tile and copy it in the reference frame */
ret = tdsc_decode_jpeg_tile(avctx, tile_size, x, y, w, h);
if (ret < 0)
return ret;
} else if (tile_mode == MKTAG(' ','W','A','R')) {
/* Just copy the buffer to output */
av_image_copy_plane(ctx->refframe->data[0] + x * 3 +
ctx->refframe->linesize[0] * y,
ctx->refframe->linesize[0], ctx->tilebuffer,
w * 3, w * 3, h);
} else {
av_log(avctx, AV_LOG_ERROR, "Unknown tile type %08x.\n", tile_mode);
return AVERROR_INVALIDDATA;
}
av_log(avctx, AV_LOG_DEBUG, "Tile %d, %dx%d (%d.%d)\n", i, w, h, x, y);
}
return 0;
}
static int tdsc_parse_tdsf(AVCodecContext *avctx, int number_tiles)
{
TDSCContext *ctx = avctx->priv_data;
int ret, w, h, init_refframe = !ctx->refframe->data[0];
/* BITMAPINFOHEADER
* http://msdn.microsoft.com/en-us/library/windows/desktop/dd183376.aspx */
if (bytestream2_get_le32(&ctx->gbc) != BITMAPINFOHEADER_SIZE)
return AVERROR_INVALIDDATA;
/* Store size, but wait for context reinit before updating avctx */
w = bytestream2_get_le32(&ctx->gbc);
h = -bytestream2_get_le32(&ctx->gbc);
if (bytestream2_get_le16(&ctx->gbc) != 1 || // 1 plane
bytestream2_get_le16(&ctx->gbc) != 24) // BGR24
return AVERROR_INVALIDDATA;
bytestream2_skip(&ctx->gbc, 24); // unused fields
/* Update sizes */
if (avctx->width != w || avctx->height != h) {
av_log(avctx, AV_LOG_DEBUG, "Size update %dx%d -> %d%d.\n",
avctx->width, avctx->height, ctx->width, ctx->height);
ret = ff_set_dimensions(avctx, w, h);
if (ret < 0)
return ret;
init_refframe = 1;
}
ctx->refframe->width = ctx->width = w;
ctx->refframe->height = ctx->height = h;
/* Allocate the reference frame if not already done or on size change */
if (init_refframe) {
ret = av_frame_get_buffer(ctx->refframe, 32);
if (ret < 0)
return ret;
}
/* Decode all tiles in a frame */
return tdsc_decode_tiles(avctx, number_tiles);
}
static int tdsc_parse_dtsm(AVCodecContext *avctx)
{
TDSCContext *ctx = avctx->priv_data;
int ret;
int action = bytestream2_get_le32(&ctx->gbc);
bytestream2_skip(&ctx->gbc, 4); // some kind of ID or version maybe?
if (action == 2 || action == 3) {
/* Load cursor coordinates */
ctx->cursor_x = bytestream2_get_le32(&ctx->gbc);
ctx->cursor_y = bytestream2_get_le32(&ctx->gbc);
/* Load a full cursor sprite */
if (action == 3) {
ret = tdsc_load_cursor(avctx);
/* Do not consider cursor errors fatal unless in explode mode */
if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
return ret;
}
} else {
avpriv_request_sample(avctx, "Cursor action %d", action);
}
return 0;
}
static int tdsc_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
TDSCContext *ctx = avctx->priv_data;
AVFrame *frame = data;
int ret, tag_header, keyframe = 0;
uLongf dlen;
/* Resize deflate buffer on resolution change */
if (ctx->width != avctx->width || ctx->height != avctx->height) {
ctx->deflatelen = avctx->width * avctx->height * (3 + 1);
ret = av_reallocp(&ctx->deflatebuffer, ctx->deflatelen);
if (ret < 0)
return ret;
}
dlen = ctx->deflatelen;
/* Frames are deflated, need to inflate them first */
ret = uncompress(ctx->deflatebuffer, &dlen, avpkt->data, avpkt->size);
if (ret) {
av_log(avctx, AV_LOG_ERROR, "Deflate error %d.\n", ret);
return AVERROR_UNKNOWN;
}
bytestream2_init(&ctx->gbc, ctx->deflatebuffer, dlen);
/* Check for tag and for size info */
if (bytestream2_get_bytes_left(&ctx->gbc) < 4 + 4) {
av_log(avctx, AV_LOG_ERROR, "Frame is too small.\n");
return AVERROR_INVALIDDATA;
}
/* Read tag */
tag_header = bytestream2_get_le32(&ctx->gbc);
if (tag_header == MKTAG('T','D','S','F')) {
int number_tiles;
if (bytestream2_get_bytes_left(&ctx->gbc) < TDSF_HEADER_SIZE) {
av_log(avctx, AV_LOG_ERROR, "TDSF tag is too small.\n");
return AVERROR_INVALIDDATA;
}
/* First 4 bytes here are the number of GEPJ/WAR tiles in this frame */
number_tiles = bytestream2_get_le32(&ctx->gbc);
bytestream2_skip(&ctx->gbc, 4); // internal timestamp maybe?
keyframe = bytestream2_get_le32(&ctx->gbc) == 0x30;
ret = tdsc_parse_tdsf(avctx, number_tiles);
if (ret < 0)
return ret;
/* Check if there is anything else we are able to parse */
if (bytestream2_get_bytes_left(&ctx->gbc) >= 4 + 4)
tag_header = bytestream2_get_le32(&ctx->gbc);
}
/* This tag can be after a TDSF block or on its own frame */
if (tag_header == MKTAG('D','T','S','M')) {
/* First 4 bytes here are the total size in bytes for this frame */
int tag_size = bytestream2_get_le32(&ctx->gbc);
if (bytestream2_get_bytes_left(&ctx->gbc) < tag_size) {
av_log(avctx, AV_LOG_ERROR, "DTSM tag is too small.\n");
return AVERROR_INVALIDDATA;
}
ret = tdsc_parse_dtsm(avctx);
if (ret < 0)
return ret;
}
/* Get the output frame and copy the reference frame */
ret = ff_get_buffer(avctx, frame, 0);
if (ret < 0)
return ret;
ret = av_frame_copy(frame, ctx->refframe);
if (ret < 0)
return ret;
/* Paint the cursor on the output frame */
tdsc_paint_cursor(avctx, frame->data[0], frame->linesize[0]);
/* Frame is ready to be output */
if (keyframe) {
frame->pict_type = AV_PICTURE_TYPE_I;
frame->key_frame = 1;
} else {
frame->pict_type = AV_PICTURE_TYPE_P;
}
*got_frame = 1;
return 0;
}
AVCodec ff_tdsc_decoder = {
.name = "tdsc",
.long_name = NULL_IF_CONFIG_SMALL("TDSC"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_TDSC,
.init = tdsc_init,
.decode = tdsc_decode_frame,
.close = tdsc_close,
.priv_data_size = sizeof(TDSCContext),
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
FF_CODEC_CAP_INIT_CLEANUP,
};