Statistics
| Branch: | Revision:

ffmpeg / libavcodec / rawdec.c @ 48026fbe

History | View | Annotate | Download (4.97 KB)

1
/*
2
 * Raw Video Decoder
3
 * Copyright (c) 2001 Fabrice Bellard.
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 rawdec.c
24
 * Raw Video Decoder
25
 */
26

    
27
#include "avcodec.h"
28
#include "raw.h"
29

    
30
typedef struct RawVideoContext {
31
    unsigned char * buffer;  /* block of memory for holding one frame */
32
    int             length;  /* number of bytes in buffer */
33
    AVFrame pic;             ///< AVCodecContext.coded_frame
34
} RawVideoContext;
35

    
36
static const PixelFormatTag pixelFormatBpsAVI[] = {
37
    { PIX_FMT_PAL8,    4 },
38
    { PIX_FMT_PAL8,    8 },
39
    { PIX_FMT_RGB555, 15 },
40
    { PIX_FMT_RGB555, 16 },
41
    { PIX_FMT_BGR24,  24 },
42
    { PIX_FMT_RGB32,  32 },
43
    { -1, 0 },
44
};
45

    
46
static const PixelFormatTag pixelFormatBpsMOV[] = {
47
    /* FIXME fix swscaler to support those */
48
    /* http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/chapter_4_section_2.html */
49
    { PIX_FMT_PAL8,      4 },
50
    { PIX_FMT_PAL8,      8 },
51
    { PIX_FMT_BGR555,   16 },
52
    { PIX_FMT_RGB24,    24 },
53
    { PIX_FMT_BGR32_1,  32 },
54
    { -1, 0 },
55
};
56

    
57
static int findPixelFormat(const PixelFormatTag *tags, unsigned int fourcc)
58
{
59
    while (tags->pix_fmt >= 0) {
60
        if (tags->fourcc == fourcc)
61
            return tags->pix_fmt;
62
        tags++;
63
    }
64
    return PIX_FMT_YUV420P;
65
}
66

    
67
static int raw_init_decoder(AVCodecContext *avctx)
68
{
69
    RawVideoContext *context = avctx->priv_data;
70

    
71
    if (avctx->codec_tag == MKTAG('r','a','w',' '))
72
        avctx->pix_fmt = findPixelFormat(pixelFormatBpsMOV, avctx->bits_per_sample);
73
    else if (avctx->codec_tag)
74
        avctx->pix_fmt = findPixelFormat(ff_raw_pixelFormatTags, avctx->codec_tag);
75
    else if (avctx->bits_per_sample)
76
        avctx->pix_fmt = findPixelFormat(pixelFormatBpsAVI, avctx->bits_per_sample);
77

    
78
    context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
79
    context->buffer = av_malloc(context->length);
80
    context->pic.pict_type = FF_I_TYPE;
81
    context->pic.key_frame = 1;
82

    
83
    avctx->coded_frame= &context->pic;
84

    
85
    if (!context->buffer)
86
        return -1;
87

    
88
    return 0;
89
}
90

    
91
static void flip(AVCodecContext *avctx, AVPicture * picture){
92
    if(!avctx->codec_tag && avctx->bits_per_sample && picture->linesize[2]==0){
93
        picture->data[0] += picture->linesize[0] * (avctx->height-1);
94
        picture->linesize[0] *= -1;
95
    }
96
}
97

    
98
static int raw_decode(AVCodecContext *avctx,
99
                            void *data, int *data_size,
100
                            const uint8_t *buf, int buf_size)
101
{
102
    RawVideoContext *context = avctx->priv_data;
103

    
104
    AVFrame * frame = (AVFrame *) data;
105
    AVPicture * picture = (AVPicture *) data;
106

    
107
    frame->interlaced_frame = avctx->coded_frame->interlaced_frame;
108
    frame->top_field_first = avctx->coded_frame->top_field_first;
109

    
110
    //4bpp raw in avi and mov (yes this is ugly ...)
111
    if(avctx->bits_per_sample == 4 && avctx->pix_fmt==PIX_FMT_PAL8 &&
112
       (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){
113
        int i;
114
        for(i=256*2; i+1 < context->length>>1; i++){
115
            context->buffer[2*i+0]= buf[i-256*2]>>4;
116
            context->buffer[2*i+1]= buf[i-256*2]&15;
117
        }
118
        buf= context->buffer + 256*4;
119
        buf_size= context->length - 256*4;
120
    }
121

    
122
    if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0))
123
        return -1;
124

    
125
    avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height);
126
    if(avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length){
127
        frame->data[1]= context->buffer;
128
    }
129
    if (avctx->palctrl && avctx->palctrl->palette_changed) {
130
        memcpy(frame->data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
131
        avctx->palctrl->palette_changed = 0;
132
    }
133

    
134
    flip(avctx, picture);
135

    
136
    if (avctx->codec_tag == MKTAG('Y', 'V', '1', '2'))
137
    {
138
        // swap fields
139
        unsigned char *tmp = picture->data[1];
140
        picture->data[1] = picture->data[2];
141
        picture->data[2] = tmp;
142
    }
143

    
144
    *data_size = sizeof(AVPicture);
145
    return buf_size;
146
}
147

    
148
static int raw_close_decoder(AVCodecContext *avctx)
149
{
150
    RawVideoContext *context = avctx->priv_data;
151

    
152
    av_freep(&context->buffer);
153
    return 0;
154
}
155

    
156
AVCodec rawvideo_decoder = {
157
    "rawvideo",
158
    CODEC_TYPE_VIDEO,
159
    CODEC_ID_RAWVIDEO,
160
    sizeof(RawVideoContext),
161
    raw_init_decoder,
162
    NULL,
163
    raw_close_decoder,
164
    raw_decode,
165
};