1 /* GStreamer
2  * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
3  * Copyright (C) 2012 Collabora Ltd.
4  *	Author : Edward Hervey <edward@collabora.com>
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Library General Public
8  * License as published by the Free Software Foundation; either
9  * version 2 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Library General Public License for more details.
15  *
16  * You should have received a copy of the GNU Library General Public
17  * License along with this library; if not, write to the
18  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
19  * Boston, MA 02110-1301, USA.
20  */
21 
22 
23 #ifndef __GST_JPEG_DEC_H__
24 #define __GST_JPEG_DEC_H__
25 
26 
27 #include <setjmp.h>
28 #include <gst/gst.h>
29 #include <gst/video/video.h>
30 #include <gst/video/gstvideodecoder.h>
31 #include <gst/base/gstadapter.h>
32 
33 /* this is a hack hack hack to get around jpeglib header bugs... */
34 #ifdef HAVE_STDLIB_H
35 # undef HAVE_STDLIB_H
36 #endif
37 #include <stdio.h>
38 #include <jpeglib.h>
39 
40 G_BEGIN_DECLS
41 
42 #define GST_TYPE_JPEG_DEC \
43   (gst_jpeg_dec_get_type())
44 #define GST_JPEG_DEC(obj) \
45   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_JPEG_DEC,GstJpegDec))
46 #define GST_JPEG_DEC_CLASS(klass) \
47   (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_JPEG_DEC,GstJpegDecClass))
48 #define GST_IS_JPEG_DEC(obj) \
49   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_JPEG_DEC))
50 #define GST_IS_JPEG_DEC_CLASS(klass) \
51   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_JPEG_DEC))
52 
53 typedef struct _GstJpegDec           GstJpegDec;
54 typedef struct _GstJpegDecClass      GstJpegDecClass;
55 
56 struct GstJpegDecErrorMgr {
57   struct jpeg_error_mgr    pub;   /* public fields */
58   jmp_buf                  setjmp_buffer;
59 };
60 
61 struct GstJpegDecSourceMgr {
62   struct jpeg_source_mgr   pub;   /* public fields */
63   GstJpegDec              *dec;
64 };
65 
66 /* Can't use GstBaseTransform, because GstBaseTransform
67  * doesn't handle the N buffers in, 1 buffer out case,
68  * but only the 1-in 1-out case */
69 struct _GstJpegDec {
70   GstVideoDecoder decoder;
71 
72   /* negotiated state */
73   GstVideoCodecState *input_state;
74   GstVideoCodecFrame *current_frame;
75   GstMapInfo current_frame_map;
76 
77   /* parse state */
78   gboolean saw_header;
79   gint     parse_entropy_len;
80   gint     parse_resync;
81 
82   /* properties */
83   gint     idct_method;
84   gint     max_errors;  /* ATOMIC */
85 
86   struct jpeg_decompress_struct cinfo;
87   struct GstJpegDecErrorMgr     jerr;
88   struct GstJpegDecSourceMgr    jsrc;
89 
90   /* arrays for indirect decoding */
91   gboolean idr_width_allocated;
92   guchar *idr_y[16],*idr_u[16],*idr_v[16];
93   /* scratch buffer for direct decoding overflow */
94   guchar *scratch;
95   guint scratch_size;
96   /* current (parsed) image size */
97   guint    rem_img_len;
98 };
99 
100 struct _GstJpegDecClass {
101   GstVideoDecoderClass decoder_class;
102 };
103 
104 GType gst_jpeg_dec_get_type(void);
105 
106 
107 G_END_DECLS
108 
109 
110 #endif /* __GST_JPEG_DEC_H__ */
111