FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/tscc.c
Date: 2024-07-17 14:05:47
Exec Total Coverage
Lines: 49 65 75.4%
Functions: 3 3 100.0%
Branches: 18 33 54.5%

Line Branch Exec Source
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 #include "libavutil/mem.h"
38 #include "avcodec.h"
39 #include "codec_internal.h"
40 #include "decode.h"
41 #include "msrledec.h"
42 #include "zlib_wrapper.h"
43
44 #include <zlib.h>
45
46 typedef struct TsccContext {
47
48 AVCodecContext *avctx;
49 AVFrame *frame;
50
51 // Bits per pixel
52 int bpp;
53 // Decompressed data size
54 unsigned int decomp_size;
55 // Decompression buffer
56 unsigned char* decomp_buf;
57 GetByteContext gb;
58 int height;
59 FFZStream zstream;
60
61 uint32_t pal[256];
62 } CamtasiaContext;
63
64 407 static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
65 int *got_frame, AVPacket *avpkt)
66 {
67 407 const uint8_t *buf = avpkt->data;
68 407 int buf_size = avpkt->size;
69 407 CamtasiaContext * const c = avctx->priv_data;
70 407 z_stream *const zstream = &c->zstream.zstream;
71 407 AVFrame *frame = c->frame;
72 int ret;
73 407 int palette_has_changed = 0;
74
75
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407 if (c->avctx->pix_fmt == AV_PIX_FMT_PAL8) {
76 palette_has_changed = ff_copy_palette(c->pal, avpkt, avctx);
77 }
78
79 407 ret = inflateReset(zstream);
80
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407 if (ret != Z_OK) {
81 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
82 return AVERROR_UNKNOWN;
83 }
84 407 zstream->next_in = buf;
85 407 zstream->avail_in = buf_size;
86 407 zstream->next_out = c->decomp_buf;
87 407 zstream->avail_out = c->decomp_size;
88 407 ret = inflate(zstream, Z_FINISH);
89 // Z_DATA_ERROR means empty picture
90
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407 if (ret == Z_DATA_ERROR && !palette_has_changed) {
91 274 return buf_size;
92 }
93
94
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133 if ((ret != Z_OK) && (ret != Z_STREAM_END) && (ret != Z_DATA_ERROR)) {
95 1 av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret);
96 1 return AVERROR_UNKNOWN;
97 }
98
99
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132 if ((ret = ff_reget_buffer(avctx, frame, 0)) < 0)
100 return ret;
101
102
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132 if (ret != Z_DATA_ERROR) {
103 132 bytestream2_init(&c->gb, c->decomp_buf,
104 132 c->decomp_size - zstream->avail_out);
105 132 ff_msrle_decode(avctx, frame, c->bpp, &c->gb);
106 }
107
108 /* make the palette available on the way out */
109
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132 if (c->avctx->pix_fmt == AV_PIX_FMT_PAL8) {
110 #if FF_API_PALETTE_HAS_CHANGED
111 FF_DISABLE_DEPRECATION_WARNINGS
112 frame->palette_has_changed = palette_has_changed;
113 FF_ENABLE_DEPRECATION_WARNINGS
114 #endif
115 memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
116 }
117
118
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132 if ((ret = av_frame_ref(rframe, frame)) < 0)
119 return ret;
120 132 *got_frame = 1;
121
122 /* always report that the buffer was completely consumed */
123 132 return buf_size;
124 }
125
126 4 static av_cold int decode_init(AVCodecContext *avctx)
127 {
128 4 CamtasiaContext * const c = avctx->priv_data;
129
130 4 c->avctx = avctx;
131
132 4 c->height = avctx->height;
133
134
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4 switch(avctx->bits_per_coded_sample){
135 case 8: avctx->pix_fmt = AV_PIX_FMT_PAL8; break;
136 2 case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
137 case 24:
138 avctx->pix_fmt = AV_PIX_FMT_BGR24;
139 break;
140 2 case 32: avctx->pix_fmt = AV_PIX_FMT_0RGB32; break;
141 default: av_log(avctx, AV_LOG_ERROR, "Camtasia error: unknown depth %i bpp\n", avctx->bits_per_coded_sample);
142 return AVERROR_PATCHWELCOME;
143 }
144 4 c->bpp = avctx->bits_per_coded_sample;
145 // buffer size for RLE 'best' case when 2-byte code precedes each pixel and there may be padding after it too
146 4 c->decomp_size = (((avctx->width * c->bpp + 7) >> 3) + 3 * avctx->width + 2) * avctx->height + 2;
147
148 /* Allocate decompression buffer */
149
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4 if (c->decomp_size) {
150
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4 if (!(c->decomp_buf = av_malloc(c->decomp_size))) {
151 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
152 return AVERROR(ENOMEM);
153 }
154 }
155
156 4 c->frame = av_frame_alloc();
157
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4 if (!c->frame)
158 return AVERROR(ENOMEM);
159
160 4 return ff_inflate_init(&c->zstream, avctx);
161 }
162
163 4 static av_cold int decode_end(AVCodecContext *avctx)
164 {
165 4 CamtasiaContext * const c = avctx->priv_data;
166
167 4 av_freep(&c->decomp_buf);
168 4 av_frame_free(&c->frame);
169 4 ff_inflate_end(&c->zstream);
170
171 4 return 0;
172 }
173
174 const FFCodec ff_tscc_decoder = {
175 .p.name = "camtasia",
176 CODEC_LONG_NAME("TechSmith Screen Capture Codec"),
177 .p.type = AVMEDIA_TYPE_VIDEO,
178 .p.id = AV_CODEC_ID_TSCC,
179 .priv_data_size = sizeof(CamtasiaContext),
180 .init = decode_init,
181 .close = decode_end,
182 FF_CODEC_DECODE_CB(decode_frame),
183 .p.capabilities = AV_CODEC_CAP_DR1,
184 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
185 };
186