aboutsummaryrefslogtreecommitdiffhomepage
path: root/libmpcodecs/vd_mtga.c
blob: c06e34ffd55bfa4de941f05834be1604a56edaf5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
/* author:	Tilman Sauerbeck <tsauerbeck@users.sourceforge.net>
 * based on:	XreaL's x_r_img_tga.* (http://www.sourceforge.net/projects/xreal/)
 *		libtarga.*
 *		xli's tga.*
 */

#include <stdio.h>
#include <stdlib.h>

#include "config.h"
#include "mp_msg.h"

#include "libavutil/common.h"
#include "mpbswap.h"
#include "libvo/fastmemcpy.h"

#include "vd_internal.h"

static vd_info_t info =
{
    "TGA Images decoder",
    "mtga",
    "Tilman Sauerbeck, A'rpi",
    "Tilman Sauerbeck",
    "only 24bpp and 32bpp RGB targa files support so far"
};

LIBVD_EXTERN(mtga)

typedef enum
{
    TGA_NO_DATA,
    TGA_UNCOMP_PALETTED,
    TGA_UNCOMP_TRUECOLOR,
    TGA_UNCOMP_GRAYSCALE,
    TGA_RLE_PALETTED = 9,
    TGA_RLE_TRUECOLOR,
    TGA_RLE_GRAYSCALE
} TGAImageType;

typedef struct
{
    unsigned char   id_len;
    unsigned short  img_type;
		
    unsigned short  width;
    unsigned short  height;
		
    unsigned char   bpp;
    unsigned char   origin; /* 0 = lower left, 1 = upper left */
    unsigned short  start_row;
    short           increment;
} TGAInfo;

static unsigned int out_fmt = 0;

static int last_w = -1;
static int last_h = -1;
static int last_c = -1;


/* to set/get/query special features/parameters */
static int control(sh_video_t *sh, int cmd, void *arg, ...)
{
    switch (cmd)
    {
	case VDCTRL_QUERY_FORMAT:
	    if (*((int *) arg) == out_fmt) return CONTROL_TRUE;
	    return CONTROL_FALSE;
    }
    return CONTROL_UNKNOWN;
}

/* init driver */
static int init(sh_video_t *sh)
{
    sh->context = (TGAInfo *) calloc(1, sizeof(TGAInfo));
    last_w = -1;

    return 1;
}


/* uninit driver */
static void uninit(sh_video_t *sh)
{
    TGAInfo	*info = sh->context;
    free(info);
    return;
}


/* decode a runlength-encoded tga */
static void decode_rle_tga(TGAInfo *info, unsigned char *data, mp_image_t *mpi)
{
    int	    row, col, replen, i, num_bytes = info->bpp / 8;
    unsigned char   repetitions, packet_header, *final;

    /* see line 207 to see why this loop is set up like this */
    for (row = info->start_row; (!info->origin && row) || (info->origin && row < info->height); row += info->increment)
    {
	final = mpi->planes[0] + mpi->stride[0] * row;
	
	for (col = 0; col < info->width; col += repetitions)
	{
	    packet_header = *data++;
	    repetitions = (1 + (packet_header & 0x7f));
	    replen = repetitions * num_bytes;
	    
	    if (packet_header & 0x80) /* runlength encoded packet */
	    {
		memcpy(final, data, num_bytes);
		
		// Note: this will be slow when DR to vram!
		i=num_bytes;
		while(2*i<=replen){
		    memcpy(final+i,final,i);
		    i*=2;
		}
		memcpy(final+i,final,replen-i);
		data += num_bytes;
	    }
	    else /* raw packet */
	    {
		memcpy(final, data, replen);
		data += replen;
	    }
	    
	    final += replen;
	}
    }
    
    return;
}


static void decode_uncompressed_tga(TGAInfo *info, unsigned char *data, mp_image_t *mpi)
{
    unsigned char   *final;
    int	    row, num_bytes = info->bpp / 8;
   
    /* see line 207 to see why this loop is set up like this */
    for (row = info->start_row; (!info->origin && row) || (info->origin && row < info->height); row += info->increment)
    {
	final = mpi->planes[0] + mpi->stride[0] * row;
	memcpy(final, data, info->width * num_bytes);
	data += info->width * num_bytes;
    }

    return;
}


static short read_tga_header(unsigned char *buf, TGAInfo *info)
{
    info->id_len = buf[0];
    
    info->img_type = buf[2];

    /* targa data is always stored in little endian byte order */
    info->width = le2me_16(*(unsigned short *) &buf[12]);
    info->height = le2me_16(*(unsigned short *) &buf[14]);

    info->bpp = buf[16];
    
    info->origin = (buf[17] & 0x20) >> 5;

    /* FIXME check for valid targa data */
    
    return 0;
}


/* decode a frame */
static mp_image_t *decode(sh_video_t *sh, void *raw, int len, int flags)
{
    TGAInfo	    *info = sh->context;
    unsigned char   *data = raw;
    mp_image_t	    *mpi;
    
    
    if (len <= 0)
	return NULL; /* skip frame */

    read_tga_header(data, info); /* read information about the file */
    
    if (info->bpp == 24)
	out_fmt = IMGFMT_BGR24;
    else if (info->bpp == 32)
	out_fmt = IMGFMT_BGR32;
    else
    {
	mp_msg(MSGT_DECVIDEO, MSGL_INFO, "Unsupported TGA type! depth=%d\n",info->bpp);
	return NULL;
    }
    
    if (info->img_type != TGA_UNCOMP_TRUECOLOR && info->img_type != TGA_RLE_TRUECOLOR) /* not a true color image */
    {
	mp_msg(MSGT_DECVIDEO, MSGL_INFO, "Unsupported TGA type: %i!\n", info->img_type);
	return NULL;
    }

    /* if img.origin is 0, we decode from bottom to top. if it's 1, we decode from top to bottom */
    info->start_row = (info->origin) ? 0 : info->height - 1;
    info->increment = (info->origin) ? 1 : -1;

    /* set data to the beginning of the image data */
    data += 18 + info->id_len;
  
    /* (re)init libvo if image parameters changed (width/height/colorspace) */
    if (last_w != info->width || last_h != info->height || last_c != out_fmt)
    {
	last_w = info->width;
	last_h = info->height;
	last_c = out_fmt;
	
	if (!out_fmt || !mpcodecs_config_vo(sh, info->width, info->height, out_fmt))
	    return NULL;
    }

    if (!(mpi = mpcodecs_get_image(sh, MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE, info->width, info->height)))
	return NULL;
  
    /* finally decode the image */
    if (info->img_type == TGA_UNCOMP_TRUECOLOR)
	decode_uncompressed_tga(info, data, mpi);
    else if (info->img_type == TGA_RLE_TRUECOLOR)
	decode_rle_tga(info, data, mpi);
//    else
//	mpi = NULL;

    return mpi;
}