adding ffmpeg specific version

1 files changed, 190 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/tscc.c b/ffmpeg1/libavcodec/tscc.c
new file mode 100644
index 0000000..6e1e077
--- /dev/null
+++ b/ffmpeg1/libavcodec/tscc.c
@@ -0,0 +1,190 @@
+/*
+ * TechSmith Camtasia decoder
+ * Copyright (c) 2004 Konstantin Shishkov
+ *
+ * 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
+ * TechSmith Camtasia decoder
+ *
+ * Fourcc: TSCC
+ *
+ * Codec is very simple:
+ *  it codes picture (picture difference, really)
+ *  with algorithm almost identical to Windows RLE8,
+ *  only without padding and with greater pixel sizes,
+ *  then this coded picture is packed with ZLib
+ *
+ * Supports: BGR8,BGR555,BGR24 - only BGR8 and BGR555 tested
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "avcodec.h"
+#include "internal.h"
+#include "msrledec.h"
+
+#include <zlib.h>
+
+typedef struct TsccContext {
+
+    AVCodecContext *avctx;
+    AVFrame *frame;
+
+    // Bits per pixel
+    int bpp;
+    // Decompressed data size
+    unsigned int decomp_size;
+    // Decompression buffer
+    unsigned char* decomp_buf;
+    GetByteContext gb;
+    int height;
+    z_stream zstream;
+
+    uint32_t pal[256];
+} CamtasiaContext;
+
+static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
+                        AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    CamtasiaContext * const c = avctx->priv_data;
+    const unsigned char *encoded = buf;
+    AVFrame *frame = c->frame;
+    int zret; // Zlib return code
+    int ret, len = buf_size;
+
+    if ((ret = ff_reget_buffer(avctx, frame)) < 0)
+        return ret;
+
+    zret = inflateReset(&c->zstream);
+    if (zret != Z_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
+        return AVERROR_UNKNOWN;
+    }
+    c->zstream.next_in = (uint8_t*)encoded;
+    c->zstream.avail_in = len;
+    c->zstream.next_out = c->decomp_buf;
+    c->zstream.avail_out = c->decomp_size;
+    zret = inflate(&c->zstream, Z_FINISH);
+    // Z_DATA_ERROR means empty picture
+    if ((zret != Z_OK) && (zret != Z_STREAM_END) && (zret != Z_DATA_ERROR)) {
+        av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
+        return AVERROR_UNKNOWN;
+    }
+
+
+    if (zret != Z_DATA_ERROR) {
+        bytestream2_init(&c->gb, c->decomp_buf,
+                         c->decomp_size - c->zstream.avail_out);
+        ff_msrle_decode(avctx, (AVPicture*)frame, c->bpp, &c->gb);
+    }
+
+    /* make the palette available on the way out */
+    if (c->avctx->pix_fmt == AV_PIX_FMT_PAL8) {
+        const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
+
+        if (pal) {
+            frame->palette_has_changed = 1;
+            memcpy(c->pal, pal, AVPALETTE_SIZE);
+        }
+        memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
+    }
+
+    if ((ret = av_frame_ref(data, frame)) < 0)
+        return ret;
+    *got_frame      = 1;
+
+    /* always report that the buffer was completely consumed */
+    return buf_size;
+}
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    CamtasiaContext * const c = avctx->priv_data;
+    int zret; // Zlib return code
+
+    c->avctx = avctx;
+
+    c->height = avctx->height;
+
+    // Needed if zlib unused or init aborted before inflateInit
+    memset(&c->zstream, 0, sizeof(z_stream));
+    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_RGB32; break;
+    default: av_log(avctx, AV_LOG_ERROR, "Camtasia error: unknown depth %i bpp\n", avctx->bits_per_coded_sample);
+             return AVERROR_PATCHWELCOME;
+    }
+    c->bpp = avctx->bits_per_coded_sample;
+    // buffer size for RLE 'best' case when 2-byte code precedes each pixel and there may be padding after it too
+    c->decomp_size = (((avctx->width * c->bpp + 7) >> 3) + 3 * avctx->width + 2) * avctx->height + 2;
+
+    /* Allocate decompression buffer */
+    if (c->decomp_size) {
+        if ((c->decomp_buf = av_malloc(c->decomp_size)) == NULL) {
+            av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
+            return AVERROR(ENOMEM);
+        }
+    }
+
+    c->zstream.zalloc = Z_NULL;
+    c->zstream.zfree = Z_NULL;
+    c->zstream.opaque = Z_NULL;
+    zret = inflateInit(&c->zstream);
+    if (zret != Z_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
+        return AVERROR_UNKNOWN;
+    }
+
+    c->frame = av_frame_alloc();
+
+    return 0;
+}
+
+static av_cold int decode_end(AVCodecContext *avctx)
+{
+    CamtasiaContext * const c = avctx->priv_data;
+
+    av_freep(&c->decomp_buf);
+    av_frame_free(&c->frame);
+
+    inflateEnd(&c->zstream);
+
+    return 0;
+}
+
+AVCodec ff_tscc_decoder = {
+    .name           = "camtasia",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_TSCC,
+    .priv_data_size = sizeof(CamtasiaContext),
+    .init           = decode_init,
+    .close          = decode_end,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("TechSmith Screen Capture Codec"),
+};