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1 | /* |
2 | * CamStudio decoder | |
3 | * Copyright (c) 2006 Reimar Doeffinger | |
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 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | ||
24 | #include "avcodec.h" | |
25 | #include "internal.h" | |
26 | #include "libavutil/common.h" | |
27 | ||
28 | #if CONFIG_ZLIB | |
29 | #include <zlib.h> | |
30 | #endif | |
31 | #include "libavutil/lzo.h" | |
32 | ||
33 | typedef struct { | |
34 | AVFrame *pic; | |
35 | int linelen, height, bpp; | |
36 | unsigned int decomp_size; | |
37 | unsigned char* decomp_buf; | |
38 | } CamStudioContext; | |
39 | ||
40 | static void copy_frame_default(AVFrame *f, const uint8_t *src, | |
41 | int linelen, int height) { | |
42 | int i, src_stride = FFALIGN(linelen, 4); | |
43 | uint8_t *dst = f->data[0]; | |
44 | dst += (height - 1) * f->linesize[0]; | |
45 | for (i = height; i; i--) { | |
46 | memcpy(dst, src, linelen); | |
47 | src += src_stride; | |
48 | dst -= f->linesize[0]; | |
49 | } | |
50 | } | |
51 | ||
52 | static void add_frame_default(AVFrame *f, const uint8_t *src, | |
53 | int linelen, int height) { | |
54 | int i, j, src_stride = FFALIGN(linelen, 4); | |
55 | uint8_t *dst = f->data[0]; | |
56 | dst += (height - 1) * f->linesize[0]; | |
57 | for (i = height; i; i--) { | |
58 | for (j = linelen; j; j--) | |
59 | *dst++ += *src++; | |
60 | src += src_stride - linelen; | |
61 | dst -= f->linesize[0] + linelen; | |
62 | } | |
63 | } | |
64 | ||
65 | static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, | |
66 | AVPacket *avpkt) { | |
67 | const uint8_t *buf = avpkt->data; | |
68 | int buf_size = avpkt->size; | |
69 | CamStudioContext *c = avctx->priv_data; | |
70 | int ret; | |
71 | ||
72 | if (buf_size < 2) { | |
73 | av_log(avctx, AV_LOG_ERROR, "coded frame too small\n"); | |
74 | return AVERROR_INVALIDDATA; | |
75 | } | |
76 | ||
77 | if ((ret = ff_reget_buffer(avctx, c->pic)) < 0) | |
78 | return ret; | |
79 | ||
80 | // decompress data | |
81 | switch ((buf[0] >> 1) & 7) { | |
82 | case 0: { // lzo compression | |
83 | int outlen = c->decomp_size, inlen = buf_size - 2; | |
84 | if (av_lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen)) | |
85 | av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n"); | |
86 | break; | |
87 | } | |
88 | case 1: { // zlib compression | |
89 | #if CONFIG_ZLIB | |
90 | unsigned long dlen = c->decomp_size; | |
91 | if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK) | |
92 | av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n"); | |
93 | break; | |
94 | #else | |
95 | av_log(avctx, AV_LOG_ERROR, "compiled without zlib support\n"); | |
96 | return AVERROR(ENOSYS); | |
97 | #endif | |
98 | } | |
99 | default: | |
100 | av_log(avctx, AV_LOG_ERROR, "unknown compression\n"); | |
101 | return AVERROR_INVALIDDATA; | |
102 | } | |
103 | ||
104 | // flip upside down, add difference frame | |
105 | if (buf[0] & 1) { // keyframe | |
106 | c->pic->pict_type = AV_PICTURE_TYPE_I; | |
107 | c->pic->key_frame = 1; | |
108 | copy_frame_default(c->pic, c->decomp_buf, | |
109 | c->linelen, c->height); | |
110 | } else { | |
111 | c->pic->pict_type = AV_PICTURE_TYPE_P; | |
112 | c->pic->key_frame = 0; | |
113 | add_frame_default(c->pic, c->decomp_buf, | |
114 | c->linelen, c->height); | |
115 | } | |
116 | ||
117 | *got_frame = 1; | |
118 | if ((ret = av_frame_ref(data, c->pic)) < 0) | |
119 | return ret; | |
120 | ||
121 | return buf_size; | |
122 | } | |
123 | ||
124 | static av_cold int decode_init(AVCodecContext *avctx) { | |
125 | CamStudioContext *c = avctx->priv_data; | |
126 | int stride; | |
127 | switch (avctx->bits_per_coded_sample) { | |
128 | case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555LE; break; | |
129 | case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break; | |
130 | case 32: avctx->pix_fmt = AV_PIX_FMT_BGRA; break; | |
131 | default: | |
132 | av_log(avctx, AV_LOG_ERROR, | |
133 | "CamStudio codec error: invalid depth %i bpp\n", | |
134 | avctx->bits_per_coded_sample); | |
135 | return AVERROR_INVALIDDATA; | |
136 | } | |
137 | c->bpp = avctx->bits_per_coded_sample; | |
138 | c->linelen = avctx->width * avctx->bits_per_coded_sample / 8; | |
139 | c->height = avctx->height; | |
140 | stride = FFALIGN(c->linelen, 4); | |
141 | c->decomp_size = c->height * stride; | |
142 | c->decomp_buf = av_malloc(c->decomp_size + AV_LZO_OUTPUT_PADDING); | |
143 | if (!c->decomp_buf) { | |
144 | av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); | |
145 | return AVERROR(ENOMEM); | |
146 | } | |
147 | c->pic = av_frame_alloc(); | |
148 | if (!c->pic) | |
149 | return AVERROR(ENOMEM); | |
150 | return 0; | |
151 | } | |
152 | ||
153 | static av_cold int decode_end(AVCodecContext *avctx) { | |
154 | CamStudioContext *c = avctx->priv_data; | |
155 | av_freep(&c->decomp_buf); | |
156 | av_frame_free(&c->pic); | |
157 | return 0; | |
158 | } | |
159 | ||
160 | AVCodec ff_cscd_decoder = { | |
161 | .name = "camstudio", | |
162 | .long_name = NULL_IF_CONFIG_SMALL("CamStudio"), | |
163 | .type = AVMEDIA_TYPE_VIDEO, | |
164 | .id = AV_CODEC_ID_CSCD, | |
165 | .priv_data_size = sizeof(CamStudioContext), | |
166 | .init = decode_init, | |
167 | .close = decode_end, | |
168 | .decode = decode_frame, | |
169 | .capabilities = CODEC_CAP_DR1, | |
170 | }; |