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FFmpeg/libavcodec/tdsc.c
Andreas Rheinhardt 4243da4ff4 avcodec/codec_internal: Use union for FFCodec decode/encode callbacks 
This is possible, because every given FFCodec has to implement
exactly one of these. Doing so decreases sizeof(FFCodec) and
therefore decreases the size of the binary.
Notice that in case of position-independent code the decrease
is in .data.rel.ro, so that this translates to decreased
memory consumption.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-04-05 20:02:37 +02:00

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/*
* TDSC decoder
* Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
*
* 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
* 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 "codec_internal.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)
AVPacket *jpkt; // encoded JPEG tile
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_packet_free(&ctx->jpkt);
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();
ctx->jpkt = av_packet_alloc();
if (!ctx->refframe || !ctx->jpgframe || !ctx->jpkt)
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, 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) {
uint32_t 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) {
uint32_t 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;
int ret;
/* Prepare a packet and send to the MJPEG decoder */
av_packet_unref(ctx->jpkt);
ctx->jpkt->data = ctx->tilebuffer;
ctx->jpkt->size = tile_size;
ret = avcodec_send_packet(ctx->jpeg_avctx, ctx->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, x2, y2, 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);
x2 = bytestream2_get_le32(&ctx->gbc);
y2 = bytestream2_get_le32(&ctx->gbc);
if (x < 0 || y < 0 || x2 <= x || y2 <= y ||
x2 > ctx->width || y2 > ctx->height
) {
av_log(avctx, AV_LOG_ERROR,
"Invalid tile position (%d.%d %d.%d outside %dx%d).\n",
x, y, x2, y2, ctx->width, ctx->height);
return AVERROR_INVALIDDATA;
}
w = x2 - x;
h = y2 - y;
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, 0);
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, AVFrame *frame,
int *got_frame, AVPacket *avpkt)
{
TDSCContext *ctx = avctx->priv_data;
int ret, tag_header, keyframe = 0;
uLongf dlen;
/* Resize deflate buffer on resolution change */
if (ctx->width != avctx->width || ctx->height != avctx->height) {
int deflatelen = avctx->width * avctx->height * (3 + 1);
if (deflatelen != ctx->deflatelen) {
ctx->deflatelen =deflatelen;
ret = av_reallocp(&ctx->deflatebuffer, ctx->deflatelen);
if (ret < 0) {
ctx->deflatelen = 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 avpkt->size;
}
const FFCodec ff_tdsc_decoder = {
.p.name = "tdsc",
.p.long_name = NULL_IF_CONFIG_SMALL("TDSC"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_TDSC,
.init = tdsc_init,
FF_CODEC_DECODE_CB(tdsc_decode_frame),
.close = tdsc_close,
.priv_data_size = sizeof(TDSCContext),
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
FF_CODEC_CAP_INIT_CLEANUP,
};
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