/* * 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", .long_name = NULL_IF_CONFIG_SMALL("TechSmith Screen Capture Codec"), .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, };