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FFmpeg/libavcodec/rscc.c
Andreas Rheinhardt a247ac640d avcodec: Constify AVCodecs
Given that the AVCodec.next pointer has now been removed, most of the
AVCodecs are not modified at all any more and can therefore be made
const (as this patch does); the only exceptions are the very few codecs
for external libraries that have a init_static_data callback.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 10:43:15 -03:00

378 lines
12 KiB
C

/*
* innoHeim/Rsupport Screen Capture Codec
* 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
* innoHeim/Rsupport Screen Capture Codec decoder
*
* Fourcc: ISCC, RSCC
*
* Lossless codec, data stored in tiles, with optional deflate compression.
*
* Header contains the number of tiles in a frame with the tile coordinates,
* and it can be deflated or not. Similarly, pixel data comes after the header
* and a variable size value, and it can be deflated or just raw.
*
* Supports: PAL8, BGRA, BGR24, RGB555
*/
#include <stdint.h>
#include <string.h>
#include <zlib.h>
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "avcodec.h"
#include "bytestream.h"
#include "decode.h"
#include "internal.h"
#define TILE_SIZE 8
typedef struct Tile {
int x, y;
int w, h;
} Tile;
typedef struct RsccContext {
GetByteContext gbc;
AVFrame *reference;
Tile *tiles;
unsigned int tiles_size;
int component_size;
uint8_t palette[AVPALETTE_SIZE];
/* zlib interaction */
uint8_t *inflated_buf;
uLongf inflated_size;
int valid_pixels;
} RsccContext;
static av_cold int rscc_init(AVCodecContext *avctx)
{
RsccContext *ctx = avctx->priv_data;
/* These needs to be set to estimate uncompressed buffer */
int ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
avctx->width, avctx->height);
return ret;
}
/* Allocate reference frame */
ctx->reference = av_frame_alloc();
if (!ctx->reference)
return AVERROR(ENOMEM);
/* Get pixel format and the size of the pixel */
if (avctx->codec_tag == MKTAG('I', 'S', 'C', 'C')) {
if (avctx->extradata && avctx->extradata_size == 4) {
if ((avctx->extradata[0] >> 1) & 1) {
avctx->pix_fmt = AV_PIX_FMT_BGRA;
ctx->component_size = 4;
} else {
avctx->pix_fmt = AV_PIX_FMT_BGR24;
ctx->component_size = 3;
}
} else {
avctx->pix_fmt = AV_PIX_FMT_BGRA;
ctx->component_size = 4;
}
} else if (avctx->codec_tag == MKTAG('R', 'S', 'C', 'C')) {
ctx->component_size = avctx->bits_per_coded_sample / 8;
switch (avctx->bits_per_coded_sample) {
case 8:
avctx->pix_fmt = AV_PIX_FMT_PAL8;
break;
case 16:
avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
break;
case 24:
avctx->pix_fmt = AV_PIX_FMT_BGR24;
break;
case 32:
avctx->pix_fmt = AV_PIX_FMT_BGR0;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Invalid bits per pixel value (%d)\n",
avctx->bits_per_coded_sample);
return AVERROR_INVALIDDATA;
}
} else {
avctx->pix_fmt = AV_PIX_FMT_BGR0;
ctx->component_size = 4;
av_log(avctx, AV_LOG_WARNING, "Invalid codec tag\n");
}
/* Store the value to check for keyframes */
ctx->inflated_size = avctx->width * avctx->height * ctx->component_size;
/* Allocate maximum size possible, a full frame */
ctx->inflated_buf = av_malloc(ctx->inflated_size);
if (!ctx->inflated_buf)
return AVERROR(ENOMEM);
return 0;
}
static av_cold int rscc_close(AVCodecContext *avctx)
{
RsccContext *ctx = avctx->priv_data;
av_freep(&ctx->tiles);
av_freep(&ctx->inflated_buf);
av_frame_free(&ctx->reference);
return 0;
}
static int rscc_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
RsccContext *ctx = avctx->priv_data;
GetByteContext *gbc = &ctx->gbc;
GetByteContext tiles_gbc;
AVFrame *frame = data;
const uint8_t *pixels, *raw;
uint8_t *inflated_tiles = NULL;
int tiles_nb, packed_size, pixel_size = 0;
int i, ret = 0;
bytestream2_init(gbc, avpkt->data, avpkt->size);
/* Size check */
if (bytestream2_get_bytes_left(gbc) < 12) {
av_log(avctx, AV_LOG_ERROR, "Packet too small (%d)\n", avpkt->size);
return AVERROR_INVALIDDATA;
}
/* Read number of tiles, and allocate the array */
tiles_nb = bytestream2_get_le16(gbc);
if (tiles_nb == 0) {
av_log(avctx, AV_LOG_DEBUG, "no tiles\n");
return avpkt->size;
}
av_fast_malloc(&ctx->tiles, &ctx->tiles_size,
tiles_nb * sizeof(*ctx->tiles));
if (!ctx->tiles) {
ret = AVERROR(ENOMEM);
goto end;
}
av_log(avctx, AV_LOG_DEBUG, "Frame with %d tiles.\n", tiles_nb);
/* When there are more than 5 tiles, they are packed together with
* a size header. When that size does not match the number of tiles
* times the tile size, it means it needs to be inflated as well */
if (tiles_nb > 5) {
uLongf packed_tiles_size;
if (tiles_nb < 32)
packed_tiles_size = bytestream2_get_byte(gbc);
else
packed_tiles_size = bytestream2_get_le16(gbc);
ff_dlog(avctx, "packed tiles of size %lu.\n", packed_tiles_size);
/* If necessary, uncompress tiles, and hijack the bytestream reader */
if (packed_tiles_size != tiles_nb * TILE_SIZE) {
uLongf length = tiles_nb * TILE_SIZE;
if (bytestream2_get_bytes_left(gbc) < packed_tiles_size) {
ret = AVERROR_INVALIDDATA;
goto end;
}
inflated_tiles = av_malloc(length);
if (!inflated_tiles) {
ret = AVERROR(ENOMEM);
goto end;
}
ret = uncompress(inflated_tiles, &length,
gbc->buffer, packed_tiles_size);
if (ret) {
av_log(avctx, AV_LOG_ERROR, "Tile deflate error %d.\n", ret);
ret = AVERROR_UNKNOWN;
goto end;
}
/* Skip the compressed tile section in the main byte reader,
* and point it to read the newly uncompressed data */
bytestream2_skip(gbc, packed_tiles_size);
bytestream2_init(&tiles_gbc, inflated_tiles, length);
gbc = &tiles_gbc;
}
}
/* Fill in array of tiles, keeping track of how many pixels are updated */
for (i = 0; i < tiles_nb; i++) {
ctx->tiles[i].x = bytestream2_get_le16(gbc);
ctx->tiles[i].w = bytestream2_get_le16(gbc);
ctx->tiles[i].y = bytestream2_get_le16(gbc);
ctx->tiles[i].h = bytestream2_get_le16(gbc);
if (pixel_size + ctx->tiles[i].w * (int64_t)ctx->tiles[i].h * ctx->component_size > INT_MAX) {
av_log(avctx, AV_LOG_ERROR, "Invalid tile dimensions\n");
ret = AVERROR_INVALIDDATA;
goto end;
}
pixel_size += ctx->tiles[i].w * ctx->tiles[i].h * ctx->component_size;
ff_dlog(avctx, "tile %d orig(%d,%d) %dx%d.\n", i,
ctx->tiles[i].x, ctx->tiles[i].y,
ctx->tiles[i].w, ctx->tiles[i].h);
if (ctx->tiles[i].w == 0 || ctx->tiles[i].h == 0) {
av_log(avctx, AV_LOG_ERROR,
"invalid tile %d at (%d.%d) with size %dx%d.\n", i,
ctx->tiles[i].x, ctx->tiles[i].y,
ctx->tiles[i].w, ctx->tiles[i].h);
ret = AVERROR_INVALIDDATA;
goto end;
} else if (ctx->tiles[i].x + ctx->tiles[i].w > avctx->width ||
ctx->tiles[i].y + ctx->tiles[i].h > avctx->height) {
av_log(avctx, AV_LOG_ERROR,
"out of bounds tile %d at (%d.%d) with size %dx%d.\n", i,
ctx->tiles[i].x, ctx->tiles[i].y,
ctx->tiles[i].w, ctx->tiles[i].h);
ret = AVERROR_INVALIDDATA;
goto end;
}
}
/* Reset the reader in case it had been modified before */
gbc = &ctx->gbc;
/* Extract how much pixel data the tiles contain */
if (pixel_size < 0x100)
packed_size = bytestream2_get_byte(gbc);
else if (pixel_size < 0x10000)
packed_size = bytestream2_get_le16(gbc);
else if (pixel_size < 0x1000000)
packed_size = bytestream2_get_le24(gbc);
else
packed_size = bytestream2_get_le32(gbc);
ff_dlog(avctx, "pixel_size %d packed_size %d.\n", pixel_size, packed_size);
if (packed_size < 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid tile size %d\n", packed_size);
ret = AVERROR_INVALIDDATA;
goto end;
}
/* Get pixels buffer, it may be deflated or just raw */
if (pixel_size == packed_size) {
if (bytestream2_get_bytes_left(gbc) < pixel_size) {
av_log(avctx, AV_LOG_ERROR, "Insufficient input for %d\n", pixel_size);
ret = AVERROR_INVALIDDATA;
goto end;
}
pixels = gbc->buffer;
} else {
uLongf len = ctx->inflated_size;
if (bytestream2_get_bytes_left(gbc) < packed_size) {
av_log(avctx, AV_LOG_ERROR, "Insufficient input for %d\n", packed_size);
ret = AVERROR_INVALIDDATA;
goto end;
}
if (ctx->inflated_size < pixel_size) {
ret = AVERROR_INVALIDDATA;
goto end;
}
ret = uncompress(ctx->inflated_buf, &len, gbc->buffer, packed_size);
if (ret) {
av_log(avctx, AV_LOG_ERROR, "Pixel deflate error %d.\n", ret);
ret = AVERROR_UNKNOWN;
goto end;
}
pixels = ctx->inflated_buf;
}
/* Allocate when needed */
ret = ff_reget_buffer(avctx, ctx->reference, 0);
if (ret < 0)
goto end;
/* Pointer to actual pixels, will be updated when data is consumed */
raw = pixels;
for (i = 0; i < tiles_nb; i++) {
uint8_t *dst = ctx->reference->data[0] + ctx->reference->linesize[0] *
(avctx->height - ctx->tiles[i].y - 1) +
ctx->tiles[i].x * ctx->component_size;
av_image_copy_plane(dst, -1 * ctx->reference->linesize[0],
raw, ctx->tiles[i].w * ctx->component_size,
ctx->tiles[i].w * ctx->component_size,
ctx->tiles[i].h);
raw += ctx->tiles[i].w * ctx->component_size * ctx->tiles[i].h;
}
/* Frame is ready to be output */
ret = av_frame_ref(frame, ctx->reference);
if (ret < 0)
goto end;
/* Keyframe when the number of pixels updated matches the whole surface */
if (pixel_size == ctx->inflated_size) {
frame->pict_type = AV_PICTURE_TYPE_I;
frame->key_frame = 1;
} else {
frame->pict_type = AV_PICTURE_TYPE_P;
}
/* Palette handling */
if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
frame->palette_has_changed = ff_copy_palette(ctx->palette, avpkt, avctx);
memcpy(frame->data[1], ctx->palette, AVPALETTE_SIZE);
}
// We only return a picture when enough of it is undamaged, this avoids copying nearly broken frames around
if (ctx->valid_pixels < ctx->inflated_size)
ctx->valid_pixels += pixel_size;
if (ctx->valid_pixels >= ctx->inflated_size * (100 - avctx->discard_damaged_percentage) / 100)
*got_frame = 1;
ret = avpkt->size;
end:
av_free(inflated_tiles);
return ret;
}
const AVCodec ff_rscc_decoder = {
.name = "rscc",
.long_name = NULL_IF_CONFIG_SMALL("innoHeim/Rsupport Screen Capture Codec"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_RSCC,
.init = rscc_init,
.decode = rscc_decode_frame,
.close = rscc_close,
.priv_data_size = sizeof(RsccContext),
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
FF_CODEC_CAP_INIT_CLEANUP,
};