| 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 | AVFrame *frame = c->frame; |
| 72 | int ret; |
| 73 | |
| 74 | if ((ret = ff_reget_buffer(avctx, frame)) < 0) |
| 75 | return ret; |
| 76 | |
| 77 | ret = inflateReset(&c->zstream); |
| 78 | if (ret != Z_OK) { |
| 79 | av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret); |
| 80 | return AVERROR_UNKNOWN; |
| 81 | } |
| 82 | c->zstream.next_in = buf; |
| 83 | c->zstream.avail_in = buf_size; |
| 84 | c->zstream.next_out = c->decomp_buf; |
| 85 | c->zstream.avail_out = c->decomp_size; |
| 86 | ret = inflate(&c->zstream, Z_FINISH); |
| 87 | // Z_DATA_ERROR means empty picture |
| 88 | if ((ret != Z_OK) && (ret != Z_STREAM_END) && (ret != Z_DATA_ERROR)) { |
| 89 | av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret); |
| 90 | return AVERROR_UNKNOWN; |
| 91 | } |
| 92 | |
| 93 | |
| 94 | if (ret != Z_DATA_ERROR) { |
| 95 | bytestream2_init(&c->gb, c->decomp_buf, |
| 96 | c->decomp_size - c->zstream.avail_out); |
| 97 | ff_msrle_decode(avctx, (AVPicture*)frame, c->bpp, &c->gb); |
| 98 | } |
| 99 | |
| 100 | /* make the palette available on the way out */ |
| 101 | if (c->avctx->pix_fmt == AV_PIX_FMT_PAL8) { |
| 102 | const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL); |
| 103 | |
| 104 | if (pal) { |
| 105 | frame->palette_has_changed = 1; |
| 106 | memcpy(c->pal, pal, AVPALETTE_SIZE); |
| 107 | } |
| 108 | memcpy(frame->data[1], c->pal, AVPALETTE_SIZE); |
| 109 | } |
| 110 | |
| 111 | if ((ret = av_frame_ref(data, frame)) < 0) |
| 112 | return ret; |
| 113 | *got_frame = 1; |
| 114 | |
| 115 | /* always report that the buffer was completely consumed */ |
| 116 | return buf_size; |
| 117 | } |
| 118 | |
| 119 | static av_cold int decode_init(AVCodecContext *avctx) |
| 120 | { |
| 121 | CamtasiaContext * const c = avctx->priv_data; |
| 122 | int zret; // Zlib return code |
| 123 | |
| 124 | c->avctx = avctx; |
| 125 | |
| 126 | c->height = avctx->height; |
| 127 | |
| 128 | // Needed if zlib unused or init aborted before inflateInit |
| 129 | memset(&c->zstream, 0, sizeof(z_stream)); |
| 130 | switch(avctx->bits_per_coded_sample){ |
| 131 | case 8: avctx->pix_fmt = AV_PIX_FMT_PAL8; break; |
| 132 | case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break; |
| 133 | case 24: |
| 134 | avctx->pix_fmt = AV_PIX_FMT_BGR24; |
| 135 | break; |
| 136 | case 32: avctx->pix_fmt = AV_PIX_FMT_RGB32; break; |
| 137 | default: av_log(avctx, AV_LOG_ERROR, "Camtasia error: unknown depth %i bpp\n", avctx->bits_per_coded_sample); |
| 138 | return AVERROR_PATCHWELCOME; |
| 139 | } |
| 140 | c->bpp = avctx->bits_per_coded_sample; |
| 141 | // buffer size for RLE 'best' case when 2-byte code precedes each pixel and there may be padding after it too |
| 142 | c->decomp_size = (((avctx->width * c->bpp + 7) >> 3) + 3 * avctx->width + 2) * avctx->height + 2; |
| 143 | |
| 144 | /* Allocate decompression buffer */ |
| 145 | if (c->decomp_size) { |
| 146 | if (!(c->decomp_buf = av_malloc(c->decomp_size))) { |
| 147 | av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); |
| 148 | return AVERROR(ENOMEM); |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | c->zstream.zalloc = Z_NULL; |
| 153 | c->zstream.zfree = Z_NULL; |
| 154 | c->zstream.opaque = Z_NULL; |
| 155 | zret = inflateInit(&c->zstream); |
| 156 | if (zret != Z_OK) { |
| 157 | av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret); |
| 158 | return AVERROR_UNKNOWN; |
| 159 | } |
| 160 | |
| 161 | c->frame = av_frame_alloc(); |
| 162 | |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | static av_cold int decode_end(AVCodecContext *avctx) |
| 167 | { |
| 168 | CamtasiaContext * const c = avctx->priv_data; |
| 169 | |
| 170 | av_freep(&c->decomp_buf); |
| 171 | av_frame_free(&c->frame); |
| 172 | |
| 173 | inflateEnd(&c->zstream); |
| 174 | |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | AVCodec ff_tscc_decoder = { |
| 179 | .name = "camtasia", |
| 180 | .long_name = NULL_IF_CONFIG_SMALL("TechSmith Screen Capture Codec"), |
| 181 | .type = AVMEDIA_TYPE_VIDEO, |
| 182 | .id = AV_CODEC_ID_TSCC, |
| 183 | .priv_data_size = sizeof(CamtasiaContext), |
| 184 | .init = decode_init, |
| 185 | .close = decode_end, |
| 186 | .decode = decode_frame, |
| 187 | .capabilities = CODEC_CAP_DR1, |
| 188 | }; |