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Diffstat (limited to 'ffmpeg1/libavcodec/tscc.c')
| -rw-r--r-- | ffmpeg1/libavcodec/tscc.c | 190 |
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"), +}; |