382 lines
13 KiB
C
382 lines
13 KiB
C
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/*
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* innoHeim/Rsupport Screen Capture Codec
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* Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* innoHeim/Rsupport Screen Capture Codec decoder
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*
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* Fourcc: ISCC, RSCC
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*
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* Lossless codec, data stored in tiles, with optional deflate compression.
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*
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* Header contains the number of tiles in a frame with the tile coordinates,
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* and it can be deflated or not. Similarly, pixel data comes after the header
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* and a variable size value, and it can be deflated or just raw.
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*
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* Supports: PAL8, BGRA, BGR24, RGB555
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*/
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#include <stdint.h>
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#include <string.h>
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#include <zlib.h>
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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#define TILE_SIZE 8
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typedef struct Tile {
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int x, y;
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int w, h;
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} Tile;
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typedef struct RsccContext {
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GetByteContext gbc;
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AVFrame *reference;
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Tile *tiles;
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unsigned int tiles_size;
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int component_size;
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uint8_t palette[AVPALETTE_SIZE];
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/* zlib interaction */
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uint8_t *inflated_buf;
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uLongf inflated_size;
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int valid_pixels;
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} RsccContext;
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static av_cold int rscc_init(AVCodecContext *avctx)
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{
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RsccContext *ctx = avctx->priv_data;
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/* These needs to be set to estimate uncompressed buffer */
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int ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
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if (ret < 0) {
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av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
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avctx->width, avctx->height);
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return ret;
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}
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/* Allocate reference frame */
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ctx->reference = av_frame_alloc();
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if (!ctx->reference)
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return AVERROR(ENOMEM);
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/* Get pixel format and the size of the pixel */
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if (avctx->codec_tag == MKTAG('I', 'S', 'C', 'C')) {
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if (avctx->extradata && avctx->extradata_size == 4) {
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if ((avctx->extradata[0] >> 1) & 1) {
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avctx->pix_fmt = AV_PIX_FMT_BGRA;
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ctx->component_size = 4;
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} else {
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avctx->pix_fmt = AV_PIX_FMT_BGR24;
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ctx->component_size = 3;
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}
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} else {
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avctx->pix_fmt = AV_PIX_FMT_BGRA;
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ctx->component_size = 4;
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}
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} else if (avctx->codec_tag == MKTAG('R', 'S', 'C', 'C')) {
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ctx->component_size = avctx->bits_per_coded_sample / 8;
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switch (avctx->bits_per_coded_sample) {
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case 8:
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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break;
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case 16:
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avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
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break;
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case 24:
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avctx->pix_fmt = AV_PIX_FMT_BGR24;
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break;
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case 32:
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avctx->pix_fmt = AV_PIX_FMT_BGR0;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Invalid bits per pixel value (%d)\n",
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avctx->bits_per_coded_sample);
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return AVERROR_INVALIDDATA;
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}
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} else {
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avctx->pix_fmt = AV_PIX_FMT_BGR0;
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ctx->component_size = 4;
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av_log(avctx, AV_LOG_WARNING, "Invalid codec tag\n");
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}
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/* Store the value to check for keyframes */
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ctx->inflated_size = avctx->width * avctx->height * ctx->component_size;
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/* Allocate maximum size possible, a full frame */
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ctx->inflated_buf = av_malloc(ctx->inflated_size);
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if (!ctx->inflated_buf)
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return AVERROR(ENOMEM);
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return 0;
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}
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static av_cold int rscc_close(AVCodecContext *avctx)
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{
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RsccContext *ctx = avctx->priv_data;
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av_freep(&ctx->tiles);
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av_freep(&ctx->inflated_buf);
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av_frame_free(&ctx->reference);
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return 0;
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}
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static int rscc_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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RsccContext *ctx = avctx->priv_data;
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GetByteContext *gbc = &ctx->gbc;
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GetByteContext tiles_gbc;
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AVFrame *frame = data;
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const uint8_t *pixels, *raw;
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uint8_t *inflated_tiles = NULL;
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int tiles_nb, packed_size, pixel_size = 0;
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int i, ret = 0;
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bytestream2_init(gbc, avpkt->data, avpkt->size);
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/* Size check */
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if (bytestream2_get_bytes_left(gbc) < 12) {
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av_log(avctx, AV_LOG_ERROR, "Packet too small (%d)\n", avpkt->size);
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return AVERROR_INVALIDDATA;
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}
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/* Read number of tiles, and allocate the array */
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tiles_nb = bytestream2_get_le16(gbc);
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if (tiles_nb == 0) {
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av_log(avctx, AV_LOG_DEBUG, "no tiles\n");
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return avpkt->size;
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}
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av_fast_malloc(&ctx->tiles, &ctx->tiles_size,
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tiles_nb * sizeof(*ctx->tiles));
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if (!ctx->tiles) {
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ret = AVERROR(ENOMEM);
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goto end;
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}
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av_log(avctx, AV_LOG_DEBUG, "Frame with %d tiles.\n", tiles_nb);
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/* When there are more than 5 tiles, they are packed together with
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* a size header. When that size does not match the number of tiles
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* times the tile size, it means it needs to be inflated as well */
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if (tiles_nb > 5) {
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uLongf packed_tiles_size;
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if (tiles_nb < 32)
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packed_tiles_size = bytestream2_get_byte(gbc);
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else
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packed_tiles_size = bytestream2_get_le16(gbc);
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ff_dlog(avctx, "packed tiles of size %lu.\n", packed_tiles_size);
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/* If necessary, uncompress tiles, and hijack the bytestream reader */
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if (packed_tiles_size != tiles_nb * TILE_SIZE) {
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uLongf length = tiles_nb * TILE_SIZE;
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if (bytestream2_get_bytes_left(gbc) < packed_tiles_size) {
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ret = AVERROR_INVALIDDATA;
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goto end;
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}
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inflated_tiles = av_malloc(length);
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if (!inflated_tiles) {
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ret = AVERROR(ENOMEM);
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goto end;
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}
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ret = uncompress(inflated_tiles, &length,
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gbc->buffer, packed_tiles_size);
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if (ret) {
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av_log(avctx, AV_LOG_ERROR, "Tile deflate error %d.\n", ret);
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ret = AVERROR_UNKNOWN;
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goto end;
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}
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/* Skip the compressed tile section in the main byte reader,
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* and point it to read the newly uncompressed data */
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bytestream2_skip(gbc, packed_tiles_size);
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bytestream2_init(&tiles_gbc, inflated_tiles, length);
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gbc = &tiles_gbc;
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}
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}
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/* Fill in array of tiles, keeping track of how many pixels are updated */
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for (i = 0; i < tiles_nb; i++) {
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ctx->tiles[i].x = bytestream2_get_le16(gbc);
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ctx->tiles[i].w = bytestream2_get_le16(gbc);
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ctx->tiles[i].y = bytestream2_get_le16(gbc);
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ctx->tiles[i].h = bytestream2_get_le16(gbc);
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if (pixel_size + ctx->tiles[i].w * (int64_t)ctx->tiles[i].h * ctx->component_size > INT_MAX) {
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av_log(avctx, AV_LOG_ERROR, "Invalid tile dimensions\n");
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ret = AVERROR_INVALIDDATA;
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goto end;
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}
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pixel_size += ctx->tiles[i].w * ctx->tiles[i].h * ctx->component_size;
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ff_dlog(avctx, "tile %d orig(%d,%d) %dx%d.\n", i,
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ctx->tiles[i].x, ctx->tiles[i].y,
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ctx->tiles[i].w, ctx->tiles[i].h);
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if (ctx->tiles[i].w == 0 || ctx->tiles[i].h == 0) {
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av_log(avctx, AV_LOG_ERROR,
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"invalid tile %d at (%d.%d) with size %dx%d.\n", i,
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ctx->tiles[i].x, ctx->tiles[i].y,
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ctx->tiles[i].w, ctx->tiles[i].h);
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ret = AVERROR_INVALIDDATA;
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goto end;
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} else if (ctx->tiles[i].x + ctx->tiles[i].w > avctx->width ||
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ctx->tiles[i].y + ctx->tiles[i].h > avctx->height) {
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av_log(avctx, AV_LOG_ERROR,
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"out of bounds tile %d at (%d.%d) with size %dx%d.\n", i,
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ctx->tiles[i].x, ctx->tiles[i].y,
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ctx->tiles[i].w, ctx->tiles[i].h);
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ret = AVERROR_INVALIDDATA;
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goto end;
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}
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}
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/* Reset the reader in case it had been modified before */
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gbc = &ctx->gbc;
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/* Extract how much pixel data the tiles contain */
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if (pixel_size < 0x100)
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packed_size = bytestream2_get_byte(gbc);
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else if (pixel_size < 0x10000)
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packed_size = bytestream2_get_le16(gbc);
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else if (pixel_size < 0x1000000)
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packed_size = bytestream2_get_le24(gbc);
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else
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packed_size = bytestream2_get_le32(gbc);
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ff_dlog(avctx, "pixel_size %d packed_size %d.\n", pixel_size, packed_size);
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if (packed_size < 0) {
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av_log(avctx, AV_LOG_ERROR, "Invalid tile size %d\n", packed_size);
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ret = AVERROR_INVALIDDATA;
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goto end;
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}
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/* Get pixels buffer, it may be deflated or just raw */
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if (pixel_size == packed_size) {
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if (bytestream2_get_bytes_left(gbc) < pixel_size) {
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av_log(avctx, AV_LOG_ERROR, "Insufficient input for %d\n", pixel_size);
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ret = AVERROR_INVALIDDATA;
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goto end;
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}
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pixels = gbc->buffer;
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} else {
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uLongf len = ctx->inflated_size;
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if (bytestream2_get_bytes_left(gbc) < packed_size) {
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av_log(avctx, AV_LOG_ERROR, "Insufficient input for %d\n", packed_size);
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ret = AVERROR_INVALIDDATA;
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goto end;
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}
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ret = uncompress(ctx->inflated_buf, &len, gbc->buffer, packed_size);
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if (ret) {
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av_log(avctx, AV_LOG_ERROR, "Pixel deflate error %d.\n", ret);
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ret = AVERROR_UNKNOWN;
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goto end;
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}
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pixels = ctx->inflated_buf;
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}
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/* Allocate when needed */
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ret = ff_reget_buffer(avctx, ctx->reference, 0);
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if (ret < 0)
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goto end;
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/* Pointer to actual pixels, will be updated when data is consumed */
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raw = pixels;
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for (i = 0; i < tiles_nb; i++) {
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uint8_t *dst = ctx->reference->data[0] + ctx->reference->linesize[0] *
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(avctx->height - ctx->tiles[i].y - 1) +
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ctx->tiles[i].x * ctx->component_size;
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av_image_copy_plane(dst, -1 * ctx->reference->linesize[0],
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raw, ctx->tiles[i].w * ctx->component_size,
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ctx->tiles[i].w * ctx->component_size,
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ctx->tiles[i].h);
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raw += ctx->tiles[i].w * ctx->component_size * ctx->tiles[i].h;
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}
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/* Frame is ready to be output */
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ret = av_frame_ref(frame, ctx->reference);
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if (ret < 0)
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goto end;
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/* Keyframe when the number of pixels updated matches the whole surface */
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if (pixel_size == ctx->inflated_size) {
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frame->pict_type = AV_PICTURE_TYPE_I;
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frame->key_frame = 1;
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} else {
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frame->pict_type = AV_PICTURE_TYPE_P;
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}
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/* Palette handling */
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if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
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int size;
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const uint8_t *palette = av_packet_get_side_data(avpkt,
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AV_PKT_DATA_PALETTE,
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&size);
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if (palette && size == AVPALETTE_SIZE) {
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frame->palette_has_changed = 1;
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|
|
memcpy(ctx->palette, palette, AVPALETTE_SIZE);
|
||
|
|
} else if (palette) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
|
||
|
|
}
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
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,
|
||
|
|
};
|