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  1. /*
  2.  * TechSmith Camtasia decoder
  3.  * Copyright (c) 2004 Konstantin Shishkov
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * TechSmith Camtasia decoder
  25.  *
  26.  * Fourcc: TSCC
  27.  *
  28.  * Codec is very simple:
  29.  *  it codes picture (picture difference, really)
  30.  *  with algorithm almost identical to Windows RLE8,
  31.  *  only without padding and with greater pixel sizes,
  32.  *  then this coded picture is packed with ZLib
  33.  *
  34.  * Supports: BGR8,BGR555,BGR24 - only BGR8 and BGR555 tested
  35.  *
  36.  */
  37.  
  38. #include <stdio.h>
  39. #include <stdlib.h>
  40.  
  41. #include "avcodec.h"
  42. #include "internal.h"
  43. #include "msrledec.h"
  44.  
  45. #include <zlib.h>
  46.  
  47. typedef struct TsccContext {
  48.  
  49.     AVCodecContext *avctx;
  50.     AVFrame *frame;
  51.  
  52.     // Bits per pixel
  53.     int bpp;
  54.     // Decompressed data size
  55.     unsigned int decomp_size;
  56.     // Decompression buffer
  57.     unsigned char* decomp_buf;
  58.     GetByteContext gb;
  59.     int height;
  60.     z_stream zstream;
  61.  
  62.     uint32_t pal[256];
  63. } CamtasiaContext;
  64.  
  65. static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
  66.                         AVPacket *avpkt)
  67. {
  68.     const uint8_t *buf = avpkt->data;
  69.     int buf_size = avpkt->size;
  70.     CamtasiaContext * const c = avctx->priv_data;
  71.     const unsigned char *encoded = buf;
  72.     AVFrame *frame = c->frame;
  73.     int zret; // Zlib return code
  74.     int ret, len = buf_size;
  75.  
  76.     if ((ret = ff_reget_buffer(avctx, frame)) < 0)
  77.         return ret;
  78.  
  79.     zret = inflateReset(&c->zstream);
  80.     if (zret != Z_OK) {
  81.         av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
  82.         return AVERROR_UNKNOWN;
  83.     }
  84.     c->zstream.next_in = (uint8_t*)encoded;
  85.     c->zstream.avail_in = len;
  86.     c->zstream.next_out = c->decomp_buf;
  87.     c->zstream.avail_out = c->decomp_size;
  88.     zret = inflate(&c->zstream, Z_FINISH);
  89.     // Z_DATA_ERROR means empty picture
  90.     if ((zret != Z_OK) && (zret != Z_STREAM_END) && (zret != Z_DATA_ERROR)) {
  91.         av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
  92.         return AVERROR_UNKNOWN;
  93.     }
  94.  
  95.  
  96.     if (zret != Z_DATA_ERROR) {
  97.         bytestream2_init(&c->gb, c->decomp_buf,
  98.                          c->decomp_size - c->zstream.avail_out);
  99.         ff_msrle_decode(avctx, (AVPicture*)frame, c->bpp, &c->gb);
  100.     }
  101.  
  102.     /* make the palette available on the way out */
  103.     if (c->avctx->pix_fmt == AV_PIX_FMT_PAL8) {
  104.         const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
  105.  
  106.         if (pal) {
  107.             frame->palette_has_changed = 1;
  108.             memcpy(c->pal, pal, AVPALETTE_SIZE);
  109.         }
  110.         memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
  111.     }
  112.  
  113.     if ((ret = av_frame_ref(data, frame)) < 0)
  114.         return ret;
  115.     *got_frame      = 1;
  116.  
  117.     /* always report that the buffer was completely consumed */
  118.     return buf_size;
  119. }
  120.  
  121. static av_cold int decode_init(AVCodecContext *avctx)
  122. {
  123.     CamtasiaContext * const c = avctx->priv_data;
  124.     int zret; // Zlib return code
  125.  
  126.     c->avctx = avctx;
  127.  
  128.     c->height = avctx->height;
  129.  
  130.     // Needed if zlib unused or init aborted before inflateInit
  131.     memset(&c->zstream, 0, sizeof(z_stream));
  132.     switch(avctx->bits_per_coded_sample){
  133.     case  8: avctx->pix_fmt = AV_PIX_FMT_PAL8; break;
  134.     case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
  135.     case 24:
  136.              avctx->pix_fmt = AV_PIX_FMT_BGR24;
  137.              break;
  138.     case 32: avctx->pix_fmt = AV_PIX_FMT_RGB32; break;
  139.     default: av_log(avctx, AV_LOG_ERROR, "Camtasia error: unknown depth %i bpp\n", avctx->bits_per_coded_sample);
  140.              return AVERROR_PATCHWELCOME;
  141.     }
  142.     c->bpp = avctx->bits_per_coded_sample;
  143.     // buffer size for RLE 'best' case when 2-byte code precedes each pixel and there may be padding after it too
  144.     c->decomp_size = (((avctx->width * c->bpp + 7) >> 3) + 3 * avctx->width + 2) * avctx->height + 2;
  145.  
  146.     /* Allocate decompression buffer */
  147.     if (c->decomp_size) {
  148.         if ((c->decomp_buf = av_malloc(c->decomp_size)) == NULL) {
  149.             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
  150.             return AVERROR(ENOMEM);
  151.         }
  152.     }
  153.  
  154.     c->zstream.zalloc = Z_NULL;
  155.     c->zstream.zfree = Z_NULL;
  156.     c->zstream.opaque = Z_NULL;
  157.     zret = inflateInit(&c->zstream);
  158.     if (zret != Z_OK) {
  159.         av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
  160.         return AVERROR_UNKNOWN;
  161.     }
  162.  
  163.     c->frame = av_frame_alloc();
  164.  
  165.     return 0;
  166. }
  167.  
  168. static av_cold int decode_end(AVCodecContext *avctx)
  169. {
  170.     CamtasiaContext * const c = avctx->priv_data;
  171.  
  172.     av_freep(&c->decomp_buf);
  173.     av_frame_free(&c->frame);
  174.  
  175.     inflateEnd(&c->zstream);
  176.  
  177.     return 0;
  178. }
  179.  
  180. AVCodec ff_tscc_decoder = {
  181.     .name           = "camtasia",
  182.     .long_name      = NULL_IF_CONFIG_SMALL("TechSmith Screen Capture Codec"),
  183.     .type           = AVMEDIA_TYPE_VIDEO,
  184.     .id             = AV_CODEC_ID_TSCC,
  185.     .priv_data_size = sizeof(CamtasiaContext),
  186.     .init           = decode_init,
  187.     .close          = decode_end,
  188.     .decode         = decode_frame,
  189.     .capabilities   = CODEC_CAP_DR1,
  190. };
  191.