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212 lines
5.6 KiB
C
212 lines
5.6 KiB
C
/*
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* TechSmith Camtasia decoder
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* Copyright (c) 2004 Konstantin Shishkov
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* TechSmith Camtasia decoder
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*
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* Fourcc: TSCC
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*
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* Codec is very simple:
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* it codes picture (picture difference, really)
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* with algorithm almost identical to Windows RLE8,
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* only without padding and with greater pixel sizes,
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* then this coded picture is packed with ZLib
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*
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* Supports: BGR8,BGR555,BGR24 - only BGR8 and BGR555 tested
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "avcodec.h"
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#include "msrledec.h"
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#include <zlib.h>
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/*
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* Decoder context
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*/
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typedef struct TsccContext {
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AVCodecContext *avctx;
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AVFrame pic;
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// Bits per pixel
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int bpp;
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// Decompressed data size
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unsigned int decomp_size;
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// Decompression buffer
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unsigned char* decomp_buf;
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int height;
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z_stream zstream;
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uint32_t pal[256];
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} CamtasiaContext;
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/*
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*
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* Decode a frame
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*
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*/
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static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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CamtasiaContext * const c = avctx->priv_data;
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const unsigned char *encoded = buf;
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int zret; // Zlib return code
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int len = buf_size;
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if(c->pic.data[0])
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avctx->release_buffer(avctx, &c->pic);
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c->pic.reference = 1;
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c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
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if(avctx->get_buffer(avctx, &c->pic) < 0){
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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zret = inflateReset(&c->zstream);
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if (zret != Z_OK) {
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av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
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return -1;
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}
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c->zstream.next_in = encoded;
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c->zstream.avail_in = len;
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c->zstream.next_out = c->decomp_buf;
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c->zstream.avail_out = c->decomp_size;
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zret = inflate(&c->zstream, Z_FINISH);
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// Z_DATA_ERROR means empty picture
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if ((zret != Z_OK) && (zret != Z_STREAM_END) && (zret != Z_DATA_ERROR)) {
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av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
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return -1;
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}
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if(zret != Z_DATA_ERROR)
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ff_msrle_decode(avctx, (AVPicture*)&c->pic, c->bpp, c->decomp_buf, c->decomp_size - c->zstream.avail_out);
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/* make the palette available on the way out */
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if (c->avctx->pix_fmt == PIX_FMT_PAL8) {
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const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
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if (pal) {
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c->pic.palette_has_changed = 1;
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memcpy(c->pal, pal, AVPALETTE_SIZE);
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}
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memcpy(c->pic.data[1], c->pal, AVPALETTE_SIZE);
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}
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = c->pic;
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/* always report that the buffer was completely consumed */
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return buf_size;
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}
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/*
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*
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* Init tscc decoder
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*
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*/
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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CamtasiaContext * const c = avctx->priv_data;
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int zret; // Zlib return code
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c->avctx = avctx;
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c->height = avctx->height;
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// Needed if zlib unused or init aborted before inflateInit
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memset(&c->zstream, 0, sizeof(z_stream));
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switch(avctx->bits_per_coded_sample){
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case 8: avctx->pix_fmt = PIX_FMT_PAL8; break;
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case 16: avctx->pix_fmt = PIX_FMT_RGB555; break;
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case 24:
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avctx->pix_fmt = PIX_FMT_BGR24;
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break;
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case 32: avctx->pix_fmt = PIX_FMT_RGB32; break;
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default: av_log(avctx, AV_LOG_ERROR, "Camtasia error: unknown depth %i bpp\n", avctx->bits_per_coded_sample);
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return -1;
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}
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c->bpp = avctx->bits_per_coded_sample;
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// buffer size for RLE 'best' case when 2-byte code precedes each pixel and there may be padding after it too
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c->decomp_size = (((avctx->width * c->bpp + 7) >> 3) + 3 * avctx->width + 2) * avctx->height + 2;
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/* Allocate decompression buffer */
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if (c->decomp_size) {
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if ((c->decomp_buf = av_malloc(c->decomp_size)) == NULL) {
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av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
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return 1;
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}
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}
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c->zstream.zalloc = Z_NULL;
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c->zstream.zfree = Z_NULL;
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c->zstream.opaque = Z_NULL;
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zret = inflateInit(&c->zstream);
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if (zret != Z_OK) {
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av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
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return 1;
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}
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return 0;
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}
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/*
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*
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* Uninit tscc decoder
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*
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*/
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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CamtasiaContext * const c = avctx->priv_data;
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av_freep(&c->decomp_buf);
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if (c->pic.data[0])
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avctx->release_buffer(avctx, &c->pic);
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inflateEnd(&c->zstream);
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return 0;
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}
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AVCodec ff_tscc_decoder = {
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.name = "camtasia",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_TSCC,
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.priv_data_size = sizeof(CamtasiaContext),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("TechSmith Screen Capture Codec"),
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};
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