From 533a6198505edd1379e1cd722852350ae4a85acc Mon Sep 17 00:00:00 2001 From: Vittorio Giovara Date: Mon, 19 Oct 2015 14:23:43 +0200 Subject: innoHeim/Rsupport Screen Capture Codec decoder Signed-off-by: Vittorio Giovara --- libavcodec/rscc.c | 284 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 284 insertions(+) create mode 100644 libavcodec/rscc.c (limited to 'libavcodec/rscc.c') diff --git a/libavcodec/rscc.c b/libavcodec/rscc.c new file mode 100644 index 0000000000..c54482f949 --- /dev/null +++ b/libavcodec/rscc.c @@ -0,0 +1,284 @@ +/* + * innoHeim/Rsupport Screen Capture Codec + * Copyright (C) 2015 Vittorio Giovara + * + * 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 + * 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: BGRA + */ + +#include +#include +#include + +#include "libavutil/imgutils.h" +#include "libavutil/internal.h" + +#include "avcodec.h" +#include "bytestream.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; + + /* zlib interaction */ + uint8_t *inflated_buf; + uLongf inflated_size; +} 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); + + avctx->pix_fmt = AV_PIX_FMT_BGRA; + + /* Store the value to check for keyframes */ + ctx->inflated_size = avctx->width * avctx->height * 4; + + /* 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); + 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; + 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); + + pixel_size += ctx->tiles[i].w * ctx->tiles[i].h * 4; + + 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); + + /* Get pixels buffer, it may be deflated or just raw */ + if (pixel_size == packed_size) { + pixels = gbc->buffer; + } else { + uLongf len = ctx->inflated_size; + 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); + 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 * 4; + av_image_copy_plane(dst, -1 * ctx->reference->linesize[0], + raw, ctx->tiles[i].w * 4, + ctx->tiles[i].w * 4, ctx->tiles[i].h); + raw += ctx->tiles[i].w * 4 * 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; + } + *got_frame = 1; + +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, +}; -- cgit v1.2.3