--- /dev/null
+/*
+ * TechSmith Camtasia decoder
+ * Copyright (c) 2004 Konstantin Shishkov
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+/**
+ * @file tscc.c
+ * 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 BGR555 tested
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "common.h"
+#include "avcodec.h"
+
+#ifdef CONFIG_ZLIB
+#include <zlib.h>
+#endif
+
+
+/*
+ * Decoder context
+ */
+typedef struct TsccContext {
+
+ AVCodecContext *avctx;
+ AVFrame pic;
+
+ // Bits per pixel
+ int bpp;
+ // Decompressed data size
+ unsigned int decomp_size;
+ // Decompression buffer
+ unsigned char* decomp_buf;
+ int height;
+#ifdef CONFIG_ZLIB
+ z_stream zstream;
+#endif
+} CamtasiaContext;
+
+/*
+ *
+ * Decode RLE - almost identical to Windows BMP RLE8
+ * and enhanced to bigger color depths
+ *
+ */
+
+static int decode_rle(CamtasiaContext *c)
+{
+ unsigned char *src = c->decomp_buf;
+ unsigned char *output = c->pic.data[0];
+ int p1, p2, line=c->height, pos=0, i;
+ while(src < c->decomp_buf + c->decomp_size) {
+ p1 = *src++;
+ if(p1 == 0) { //Escape code
+ p2 = *src++;
+ if(p2 == 0) { //End-of-line
+ output = c->pic.data[0] + (--line) * c->pic.linesize[0];
+ pos = 0;
+ continue;
+ } else if(p2 == 1) { //End-of-picture
+ return 0;
+ } else if(p2 == 2) { //Skip
+ p1 = *src++;
+ p2 = *src++;
+ line -= p2;
+ pos += p1;
+ output = c->pic.data[0] + line * c->pic.linesize[0] + pos * (c->bpp / 8);
+ continue;
+ }
+ // Copy data
+ for(i = 0; i < p2 * (c->bpp / 8); i++) {
+ *output++ = *src++;
+ }
+ pos += p2;
+ } else { //Run of pixels
+ int pix[3]; //original pixel
+ switch(c->bpp){
+ case 8: pix[0] = *src++;
+ break;
+ case 16: pix[0] = *src++;
+ pix[1] = *src++;
+ break;
+ case 24: pix[0] = *src++;
+ pix[1] = *src++;
+ pix[2] = *src++;
+ break;
+ }
+ for(i = 0; i < p1; i++) {
+ switch(c->bpp){
+ case 8: *output++ = pix[0];
+ break;
+ case 16: *output++ = pix[0];
+ *output++ = pix[1];
+ break;
+ case 24: *output++ = pix[0];
+ *output++ = pix[1];
+ *output++ = pix[2];
+ break;
+ }
+ }
+ pos += p1;
+ }
+ }
+
+ av_log(c->avctx, AV_LOG_ERROR, "Camtasia warning: no End-of-picture code\n");
+ return 1;
+}
+
+/*
+ *
+ * Decode a frame
+ *
+ */
+static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
+{
+ CamtasiaContext * const c = (CamtasiaContext *)avctx->priv_data;
+ unsigned char *encoded = (unsigned char *)buf;
+ unsigned char *outptr;
+#ifdef CONFIG_ZLIB
+ int zret; // Zlib return code
+#endif
+ int len = buf_size;
+
+ /* no supplementary picture */
+ if (buf_size == 0)
+ return 0;
+
+ if(c->pic.data[0])
+ avctx->release_buffer(avctx, &c->pic);
+
+ c->pic.reference = 1;
+ c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
+ if(avctx->get_buffer(avctx, &c->pic) < 0){
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return -1;
+ }
+
+ outptr = c->pic.data[0]; // Output image pointer
+
+#ifdef CONFIG_ZLIB
+ zret = inflateReset(&(c->zstream));
+ if (zret != Z_OK) {
+ av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
+ return -1;
+ }
+ c->zstream.next_in = 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 -1;
+ }
+ encoded = c->decomp_buf;
+ len = c->decomp_size;
+ if(zret != Z_DATA_ERROR)
+ decode_rle(c);
+#else
+ av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
+ return -1;
+#endif
+
+ *data_size = sizeof(AVFrame);
+ *(AVFrame*)data = c->pic;
+
+ /* always report that the buffer was completely consumed */
+ return buf_size;
+}
+
+
+
+/*
+ *
+ * Init tscc decoder
+ *
+ */
+static int decode_init(AVCodecContext *avctx)
+{
+ CamtasiaContext * const c = (CamtasiaContext *)avctx->priv_data;
+ int zret; // Zlib return code
+
+ c->avctx = avctx;
+ avctx->has_b_frames = 0;
+
+ c->pic.data[0] = NULL;
+ c->height = avctx->height;
+
+#ifdef CONFIG_ZLIB
+ // Needed if zlib unused or init aborted before inflateInit
+ memset(&(c->zstream), 0, sizeof(z_stream));
+#else
+ av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
+ return 1;
+#endif
+ switch(avctx->bits_per_sample){
+ case 8: av_log(avctx, AV_LOG_ERROR, "Camtasia warning: RGB8 is just guessed\n");
+ avctx->pix_fmt = PIX_FMT_PAL8;
+ break;
+ case 16: avctx->pix_fmt = PIX_FMT_RGB555;break;
+ case 24: av_log(avctx, AV_LOG_ERROR, "Camtasia warning: RGB24 is just guessed\n");
+ avctx->pix_fmt = PIX_FMT_BGR24;
+ break;
+ default: av_log(avctx, AV_LOG_ERROR, "Camtasia error: unknown depth %i bpp\n", avctx->bits_per_sample);
+ return -1;
+ }
+ c->bpp = avctx->bits_per_sample;
+ av_log(avctx, AV_LOG_INFO, "bpp=%i \n\n\n", c->bpp);
+ c->decomp_size = (avctx->width * c->bpp + (avctx->width + 254) / 255 + 2) * avctx->height + 2;//RLE in the best case
+
+ /* 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 1;
+ }
+ }
+
+#ifdef CONFIG_ZLIB
+ 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 1;
+ }
+#endif
+
+ return 0;
+}
+
+
+
+/*
+ *
+ * Uninit tscc decoder
+ *
+ */
+static int decode_end(AVCodecContext *avctx)
+{
+ CamtasiaContext * const c = (CamtasiaContext *)avctx->priv_data;
+
+ if (c->pic.data[0])
+ avctx->release_buffer(avctx, &c->pic);
+#ifdef CONFIG_ZLIB
+ inflateEnd(&(c->zstream));
+#endif
+
+ return 0;
+}
+
+AVCodec tscc_decoder = {
+ "camtasia",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_TSCC,
+ sizeof(CamtasiaContext),
+ decode_init,
+ NULL,
+ decode_end,
+ decode_frame,
+ CODEC_CAP_DR1,
+};
+
projects / frescor / ffmpeg.git / commitdiff