Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / tscc.c
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 };