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-rw-r--r--libavcodec/mscc.c278
1 files changed, 278 insertions, 0 deletions
diff --git a/libavcodec/mscc.c b/libavcodec/mscc.c
new file mode 100644
index 0000000..86e4e88
--- /dev/null
+++ b/libavcodec/mscc.c
@@ -0,0 +1,278 @@
+/*
+ * Mandsoft Screen Capture Codec decoder
+ *
+ * Copyright (c) 2017 Paul B Mahol
+ *
+ * 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
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+
+#include <zlib.h>
+
+typedef struct MSCCContext {
+ unsigned bpp;
+ unsigned int decomp_size;
+ uint8_t *decomp_buf;
+ unsigned int uncomp_size;
+ uint8_t *uncomp_buf;
+ z_stream zstream;
+
+ uint32_t pal[256];
+} MSCCContext;
+
+static int rle_uncompress(AVCodecContext *avctx, GetByteContext *gb, PutByteContext *pb)
+{
+ MSCCContext *s = avctx->priv_data;
+ unsigned x = 0, y = 0;
+
+ while (bytestream2_get_bytes_left(gb) > 0) {
+ uint32_t fill;
+ int j;
+ unsigned run = bytestream2_get_byte(gb);
+
+ if (run) {
+ switch (avctx->bits_per_coded_sample) {
+ case 8:
+ fill = bytestream2_get_byte(gb);
+ break;
+ case 16:
+ fill = bytestream2_get_le16(gb);
+ break;
+ case 24:
+ fill = bytestream2_get_le24(gb);
+ break;
+ case 32:
+ fill = bytestream2_get_le32(gb);
+ break;
+ }
+
+ for (j = 0; j < run; j++) {
+ switch (avctx->bits_per_coded_sample) {
+ case 8:
+ bytestream2_put_byte(pb, fill);
+ break;
+ case 16:
+ bytestream2_put_le16(pb, fill);
+ break;
+ case 24:
+ bytestream2_put_le24(pb, fill);
+ break;
+ case 32:
+ bytestream2_put_le32(pb, fill);
+ break;
+ }
+ }
+ x += run;
+ } else {
+ unsigned copy = bytestream2_get_byte(gb);
+
+ if (copy == 0) {
+ x = 0;
+ y++;
+ bytestream2_seek_p(pb, y * avctx->width * s->bpp, SEEK_SET);
+ } else if (copy == 1) {
+ return 0;
+ } else if (copy == 2) {
+
+ x += bytestream2_get_byte(gb);
+ y += bytestream2_get_byte(gb);
+
+ bytestream2_seek_p(pb, y * avctx->width * s->bpp + x * s->bpp, SEEK_SET);
+ } else {
+ for (j = 0; j < copy; j++) {
+ switch (avctx->bits_per_coded_sample) {
+ case 8:
+ bytestream2_put_byte(pb, bytestream2_get_byte(gb));
+ break;
+ case 16:
+ bytestream2_put_le16(pb, bytestream2_get_le16(gb));
+ break;
+ case 24:
+ bytestream2_put_le24(pb, bytestream2_get_le24(gb));
+ break;
+ case 32:
+ bytestream2_put_le32(pb, bytestream2_get_le32(gb));
+ break;
+ }
+ }
+
+ if (s->bpp == 1 && (copy & 1))
+ bytestream2_skip(gb, 1);
+ x += copy;
+ }
+ }
+ }
+
+ return AVERROR_INVALIDDATA;
+}
+
+static int decode_frame(AVCodecContext *avctx,
+ void *data, int *got_frame,
+ AVPacket *avpkt)
+{
+ MSCCContext *s = avctx->priv_data;
+ AVFrame *frame = data;
+ uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ GetByteContext gb;
+ PutByteContext pb;
+ int ret, j;
+
+ if (avpkt->size < 3)
+ return buf_size;
+
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+ return ret;
+
+ if (avctx->codec_id == AV_CODEC_ID_MSCC) {
+ avpkt->data[2] ^= avpkt->data[0];
+ buf += 2;
+ buf_size -= 2;
+ }
+
+ if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
+ int size;
+ const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size);
+
+ if (pal && size == AVPALETTE_SIZE) {
+ frame->palette_has_changed = 1;
+ for (j = 0; j < 256; j++)
+ s->pal[j] = 0xFF000000 | AV_RL32(pal + j * 4);
+ } else if (pal) {
+ av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
+ }
+ memcpy(frame->data[1], s->pal, AVPALETTE_SIZE);
+ }
+
+ ret = inflateReset(&s->zstream);
+ if (ret != Z_OK) {
+ av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
+ return AVERROR_UNKNOWN;
+ }
+ s->zstream.next_in = buf;
+ s->zstream.avail_in = buf_size;
+ s->zstream.next_out = s->decomp_buf;
+ s->zstream.avail_out = s->decomp_size;
+ ret = inflate(&s->zstream, Z_FINISH);
+ if (ret != Z_STREAM_END) {
+ av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret);
+ return AVERROR_UNKNOWN;
+ }
+
+ bytestream2_init(&gb, s->decomp_buf, s->zstream.total_out);
+ bytestream2_init_writer(&pb, s->uncomp_buf, s->uncomp_size);
+
+ ret = rle_uncompress(avctx, &gb, &pb);
+ if (ret)
+ return ret;
+
+ for (j = 0; j < avctx->height; j++) {
+ memcpy(frame->data[0] + (avctx->height - j - 1) * frame->linesize[0],
+ s->uncomp_buf + s->bpp * j * avctx->width, s->bpp * avctx->width);
+ }
+
+ frame->key_frame = 1;
+ frame->pict_type = AV_PICTURE_TYPE_I;
+
+ *got_frame = 1;
+
+ return avpkt->size;
+}
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+ MSCCContext *s = avctx->priv_data;
+ int stride, zret;
+
+ switch (avctx->bits_per_coded_sample) {
+ case 8: avctx->pix_fmt = AV_PIX_FMT_PAL8; break;
+ case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
+ case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break;
+ case 32: avctx->pix_fmt = AV_PIX_FMT_BGRA; break;
+ default:
+ av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", avctx->bits_per_coded_sample);
+ return AVERROR_INVALIDDATA;
+ }
+
+ s->bpp = avctx->bits_per_coded_sample >> 3;
+ stride = 4 * ((avctx->width * avctx->bits_per_coded_sample + 31) / 32);
+
+ s->decomp_size = 2 * avctx->height * stride;
+ if (!(s->decomp_buf = av_malloc(s->decomp_size)))
+ return AVERROR(ENOMEM);
+
+ s->uncomp_size = avctx->height * stride;
+ if (!(s->uncomp_buf = av_malloc(s->uncomp_size)))
+ return AVERROR(ENOMEM);
+
+ s->zstream.zalloc = Z_NULL;
+ s->zstream.zfree = Z_NULL;
+ s->zstream.opaque = Z_NULL;
+ zret = inflateInit(&s->zstream);
+ if (zret != Z_OK) {
+ av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
+ return AVERROR_UNKNOWN;
+ }
+
+ return 0;
+}
+
+static av_cold int decode_close(AVCodecContext *avctx)
+{
+ MSCCContext *s = avctx->priv_data;
+
+ av_freep(&s->decomp_buf);
+ s->decomp_size = 0;
+ av_freep(&s->uncomp_buf);
+ s->uncomp_size = 0;
+ inflateEnd(&s->zstream);
+
+ return 0;
+}
+
+AVCodec ff_mscc_decoder = {
+ .name = "mscc",
+ .long_name = NULL_IF_CONFIG_SMALL("Mandsoft Screen Capture Codec"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_MSCC,
+ .priv_data_size = sizeof(MSCCContext),
+ .init = decode_init,
+ .close = decode_close,
+ .decode = decode_frame,
+ .capabilities = AV_CODEC_CAP_DR1,
+ .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
+};
+
+AVCodec ff_srgc_decoder = {
+ .name = "srgc",
+ .long_name = NULL_IF_CONFIG_SMALL("Screen Recorder Gold Codec"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_SRGC,
+ .priv_data_size = sizeof(MSCCContext),
+ .init = decode_init,
+ .close = decode_close,
+ .decode = decode_frame,
+ .capabilities = AV_CODEC_CAP_DR1,
+ .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
+};
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