Libav
tscc.c
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1 /*
2  * TechSmith Camtasia decoder
3  * Copyright (c) 2004 Konstantin Shishkov
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
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 
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;
58  int height;
59  z_stream zstream;
60 
61  uint32_t pal[256];
63 
64 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
65  AVPacket *avpkt)
66 {
67  const uint8_t *buf = avpkt->data;
68  int buf_size = avpkt->size;
69  CamtasiaContext * const c = avctx->priv_data;
70  AVFrame *frame = data;
71  int ret;
72 
73  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0){
74  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
75  return ret;
76  }
77 
78  ret = inflateReset(&c->zstream);
79  if (ret != Z_OK) {
80  av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
81  return AVERROR_UNKNOWN;
82  }
83  c->zstream.next_in = buf;
84  c->zstream.avail_in = buf_size;
85  c->zstream.next_out = c->decomp_buf;
86  c->zstream.avail_out = c->decomp_size;
87  ret = inflate(&c->zstream, Z_FINISH);
88  // Z_DATA_ERROR means empty picture
89  if ((ret != Z_OK) && (ret != Z_STREAM_END) && (ret != Z_DATA_ERROR)) {
90  av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret);
91  return AVERROR_UNKNOWN;
92  }
93 
94 
95  if (ret != Z_DATA_ERROR) {
97  c->decomp_size - c->zstream.avail_out);
98  ff_msrle_decode(avctx, (AVPicture*)frame, c->bpp, &c->gb);
99  }
100 
101  /* make the palette available on the way out */
102  if (c->avctx->pix_fmt == AV_PIX_FMT_PAL8) {
104 
105  if (pal) {
106  frame->palette_has_changed = 1;
107  memcpy(c->pal, pal, AVPALETTE_SIZE);
108  }
109  memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
110  }
111 
112  *got_frame = 1;
113 
114  /* always report that the buffer was completely consumed */
115  return buf_size;
116 }
117 
119 {
120  CamtasiaContext * const c = avctx->priv_data;
121  int zret; // Zlib return code
122 
123  c->avctx = avctx;
124 
125  c->height = avctx->height;
126 
127  // Needed if zlib unused or init aborted before inflateInit
128  memset(&c->zstream, 0, sizeof(z_stream));
129  switch(avctx->bits_per_coded_sample){
130  case 8: avctx->pix_fmt = AV_PIX_FMT_PAL8; break;
131  case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
132  case 24:
133  avctx->pix_fmt = AV_PIX_FMT_BGR24;
134  break;
135  case 32: avctx->pix_fmt = AV_PIX_FMT_RGB32; break;
136  default: av_log(avctx, AV_LOG_ERROR, "Camtasia error: unknown depth %i bpp\n", avctx->bits_per_coded_sample);
137  return AVERROR_INVALIDDATA;
138  }
139  c->bpp = avctx->bits_per_coded_sample;
140  // buffer size for RLE 'best' case when 2-byte code precedes each pixel and there may be padding after it too
141  c->decomp_size = (((avctx->width * c->bpp + 7) >> 3) + 3 * avctx->width + 2) * avctx->height + 2;
142 
143  /* Allocate decompression buffer */
144  if (c->decomp_size) {
145  if (!(c->decomp_buf = av_malloc(c->decomp_size))) {
146  av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
147  return AVERROR(ENOMEM);
148  }
149  }
150 
151  c->zstream.zalloc = Z_NULL;
152  c->zstream.zfree = Z_NULL;
153  c->zstream.opaque = Z_NULL;
154  zret = inflateInit(&c->zstream);
155  if (zret != Z_OK) {
156  av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
157  return AVERROR_UNKNOWN;
158  }
159 
160  return 0;
161 }
162 
164 {
165  CamtasiaContext * const c = avctx->priv_data;
166 
167  av_freep(&c->decomp_buf);
168 
169  inflateEnd(&c->zstream);
170 
171  return 0;
172 }
173 
175  .name = "camtasia",
176  .long_name = NULL_IF_CONFIG_SMALL("TechSmith Screen Capture Codec"),
177  .type = AVMEDIA_TYPE_VIDEO,
178  .id = AV_CODEC_ID_TSCC,
179  .priv_data_size = sizeof(CamtasiaContext),
180  .init = decode_init,
181  .close = decode_end,
182  .decode = decode_frame,
183  .capabilities = CODEC_CAP_DR1,
184 };
#define AVPALETTE_SIZE
Definition: avcodec.h:3029
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:62
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
int size
Definition: avcodec.h:968
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1248
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:130
unsigned char * decomp_buf
Definition: tscc.c:56
four components are given, that's all.
Definition: avcodec.h:3020
AVCodec.
Definition: avcodec.h:2790
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:198
z_stream zstream
Definition: tscc.c:59
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:275
uint8_t
#define av_cold
Definition: attributes.h:66
8 bit with PIX_FMT_RGB32 palette
Definition: pixfmt.h:76
static av_cold int decode_init(AVCodecContext *avctx)
Definition: tscc.c:118
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:684
const char data[16]
Definition: mxf.c:70
uint8_t * data
Definition: avcodec.h:967
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2501
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:168
const char * name
Name of the codec implementation.
Definition: avcodec.h:2797
AVCodecContext * avctx
Definition: tscc.c:49
GetByteContext gb
Definition: tscc.c:57
AVCodec ff_tscc_decoder
Definition: tscc.c:174
int width
picture width / height.
Definition: avcodec.h:1218
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:68
if(ac->has_optimized_func)
NULL
Definition: eval.c:55
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1044
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
#define AV_PIX_FMT_RGB32
Definition: pixfmt.h:222
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:603
uint32_t pal[256]
Definition: tscc.c:61
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:330
unsigned int decomp_size
Definition: tscc.c:54
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
common internal api header.
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:231
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:61
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
void * priv_data
Definition: avcodec.h:1086
int ff_msrle_decode(AVCodecContext *avctx, AVPicture *pic, int depth, GetByteContext *gb)
Decode stream in MS RLE format into frame.
Definition: msrledec.c:246
static av_cold int decode_end(AVCodecContext *avctx)
Definition: tscc.c:163
int height
Definition: tscc.c:58
uint8_t * av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int *size)
Get side information from packet.
Definition: avpacket.c:287
This structure stores compressed data.
Definition: avcodec.h:944
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: tscc.c:64