Commit | Line | Data |
---|---|---|
2ba45a60 DM |
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 | }; |