blob: 9e1dec9d967f7c7070cb465991cba485073bb6aa
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 CamStudioContext { |
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_BGR0; 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 = AV_CODEC_CAP_DR1, |
170 | }; |
171 |