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Fixed invalid access in wavpack decoder on corrupted bitstream.
[coroid/libav_saccubus.git] / libavcodec / libschroedinger.c
1 /*
2  * Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com >
3  *
4  * This file is part of Libav.
5  *
6  * Libav is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * Libav 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  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20
21 /**
22 * @file
23 * function definitions common to libschroedingerdec.c and libschroedingerenc.c
24 */
25
26 #include "libdirac_libschro.h"
27 #include "libschroedinger.h"
28
29 /**
30 * Schroedinger video preset table. Ensure that this tables matches up correctly
31 * with the ff_dirac_schro_video_format_info table in libdirac_libschro.c.
32 */
33 static const SchroVideoFormatEnum ff_schro_video_formats[]={
34     SCHRO_VIDEO_FORMAT_CUSTOM     ,
35     SCHRO_VIDEO_FORMAT_QSIF       ,
36     SCHRO_VIDEO_FORMAT_QCIF       ,
37     SCHRO_VIDEO_FORMAT_SIF        ,
38     SCHRO_VIDEO_FORMAT_CIF        ,
39     SCHRO_VIDEO_FORMAT_4SIF       ,
40     SCHRO_VIDEO_FORMAT_4CIF       ,
41     SCHRO_VIDEO_FORMAT_SD480I_60  ,
42     SCHRO_VIDEO_FORMAT_SD576I_50  ,
43     SCHRO_VIDEO_FORMAT_HD720P_60  ,
44     SCHRO_VIDEO_FORMAT_HD720P_50  ,
45     SCHRO_VIDEO_FORMAT_HD1080I_60 ,
46     SCHRO_VIDEO_FORMAT_HD1080I_50 ,
47     SCHRO_VIDEO_FORMAT_HD1080P_60 ,
48     SCHRO_VIDEO_FORMAT_HD1080P_50 ,
49     SCHRO_VIDEO_FORMAT_DC2K_24    ,
50     SCHRO_VIDEO_FORMAT_DC4K_24    ,
51 };
52
53 SchroVideoFormatEnum ff_get_schro_video_format_preset(AVCodecContext *avccontext)
54 {
55     unsigned int num_formats = sizeof(ff_schro_video_formats) /
56                                sizeof(ff_schro_video_formats[0]);
57
58     unsigned int idx = ff_dirac_schro_get_video_format_idx (avccontext);
59
60     return (idx < num_formats) ? ff_schro_video_formats[idx] :
61                                  SCHRO_VIDEO_FORMAT_CUSTOM;
62 }
63
64 int ff_get_schro_frame_format (SchroChromaFormat schro_pix_fmt,
65                                SchroFrameFormat  *schro_frame_fmt)
66 {
67     unsigned int num_formats = sizeof(ffmpeg_schro_pixel_format_map) /
68                                sizeof(ffmpeg_schro_pixel_format_map[0]);
69
70     int idx;
71
72     for (idx = 0; idx < num_formats; ++idx) {
73         if (ffmpeg_schro_pixel_format_map[idx].schro_pix_fmt == schro_pix_fmt) {
74             *schro_frame_fmt = ffmpeg_schro_pixel_format_map[idx].schro_frame_fmt;
75             return 0;
76         }
77     }
78     return -1;
79 }
80
81 static void FreeSchroFrame(SchroFrame *frame, void *priv)
82 {
83     AVPicture *p_pic = priv;
84
85     if (!p_pic)
86         return;
87
88     avpicture_free(p_pic);
89     av_freep(&p_pic);
90 }
91
92 SchroFrame *ff_create_schro_frame(AVCodecContext *avccontext,
93                                   SchroFrameFormat schro_frame_fmt)
94 {
95     AVPicture *p_pic;
96     SchroFrame *p_frame;
97     int y_width, uv_width;
98     int y_height, uv_height;
99     int i;
100
101     y_width   = avccontext->width;
102     y_height  = avccontext->height;
103     uv_width  = y_width  >> (SCHRO_FRAME_FORMAT_H_SHIFT(schro_frame_fmt));
104     uv_height = y_height >> (SCHRO_FRAME_FORMAT_V_SHIFT(schro_frame_fmt));
105
106     p_pic = av_mallocz(sizeof(AVPicture));
107     avpicture_alloc(p_pic, avccontext->pix_fmt, y_width, y_height);
108
109     p_frame         = schro_frame_new();
110     p_frame->format = schro_frame_fmt;
111     p_frame->width  = y_width;
112     p_frame->height = y_height;
113     schro_frame_set_free_callback(p_frame, FreeSchroFrame, (void *)p_pic);
114
115     for (i = 0; i < 3; ++i) {
116         p_frame->components[i].width  = i ? uv_width : y_width;
117         p_frame->components[i].stride = p_pic->linesize[i];
118         p_frame->components[i].height = i ? uv_height : y_height;
119         p_frame->components[i].length =
120                  p_frame->components[i].stride * p_frame->components[i].height;
121         p_frame->components[i].data   = p_pic->data[i];
122
123         if (i) {
124             p_frame->components[i].v_shift =
125                 SCHRO_FRAME_FORMAT_V_SHIFT(p_frame->format);
126             p_frame->components[i].h_shift =
127                 SCHRO_FRAME_FORMAT_H_SHIFT(p_frame->format);
128         }
129     }
130
131     return p_frame;
132 }