Statistics
| Branch: | Revision:

ffmpeg / libavcodec / rawdec.c @ b641982b

History | View | Annotate | Download (6.63 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
24
 * Raw Video Decoder
25
 */
26

    
27
#include "avcodec.h"
28
#include "imgconvert.h"
29
#include "raw.h"
30
#include "libavutil/intreadwrite.h"
31
#include "libavcore/imgutils.h"
32

    
33
typedef struct RawVideoContext {
34
    uint32_t palette[AVPALETTE_COUNT];
35
    unsigned char * buffer;  /* block of memory for holding one frame */
36
    int             length;  /* number of bytes in buffer */
37
    int flip;
38
    AVFrame pic;             ///< AVCodecContext.coded_frame
39
} RawVideoContext;
40

    
41
static const PixelFormatTag pix_fmt_bps_avi[] = {
42
    { PIX_FMT_PAL8,    4 },
43
    { PIX_FMT_PAL8,    8 },
44
    { PIX_FMT_RGB444, 12 },
45
    { PIX_FMT_RGB555, 15 },
46
    { PIX_FMT_RGB555, 16 },
47
    { PIX_FMT_BGR24,  24 },
48
    { PIX_FMT_RGB32,  32 },
49
    { PIX_FMT_NONE, 0 },
50
};
51

    
52
static const PixelFormatTag pix_fmt_bps_mov[] = {
53
    { PIX_FMT_MONOWHITE, 1 },
54
    { PIX_FMT_PAL8,      2 },
55
    { PIX_FMT_PAL8,      4 },
56
    { PIX_FMT_PAL8,      8 },
57
    // FIXME swscale does not support 16 bit in .mov, sample 16bit.mov
58
    // http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html
59
    { PIX_FMT_RGB555BE, 16 },
60
    { PIX_FMT_RGB24,    24 },
61
    { PIX_FMT_ARGB,     32 },
62
    { PIX_FMT_NONE, 0 },
63
};
64

    
65
static enum PixelFormat find_pix_fmt(const PixelFormatTag *tags, unsigned int fourcc)
66
{
67
    while (tags->pix_fmt >= 0) {
68
        if (tags->fourcc == fourcc)
69
            return tags->pix_fmt;
70
        tags++;
71
    }
72
    return PIX_FMT_YUV420P;
73
}
74

    
75
static av_cold int raw_init_decoder(AVCodecContext *avctx)
76
{
77
    RawVideoContext *context = avctx->priv_data;
78

    
79
    if (avctx->codec_tag == MKTAG('r','a','w',' '))
80
        avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_mov, avctx->bits_per_coded_sample);
81
    else if (avctx->codec_tag)
82
        avctx->pix_fmt = find_pix_fmt(ff_raw_pix_fmt_tags, avctx->codec_tag);
83
    else if (avctx->pix_fmt == PIX_FMT_NONE && avctx->bits_per_coded_sample)
84
        avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_avi, avctx->bits_per_coded_sample);
85

    
86
    ff_set_systematic_pal(context->palette, avctx->pix_fmt);
87
    context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
88
    if((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) &&
89
       avctx->pix_fmt==PIX_FMT_PAL8 &&
90
       (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){
91
        context->buffer = av_malloc(context->length);
92
        if (!context->buffer)
93
            return -1;
94
    }
95
    context->pic.pict_type = FF_I_TYPE;
96
    context->pic.key_frame = 1;
97

    
98
    avctx->coded_frame= &context->pic;
99

    
100
    if((avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||
101
       avctx->codec_tag == MKTAG( 3 ,  0 ,  0 ,  0 ))
102
        context->flip=1;
103

    
104
    return 0;
105
}
106

    
107
static void flip(AVCodecContext *avctx, AVPicture * picture){
108
    picture->data[0] += picture->linesize[0] * (avctx->height-1);
109
    picture->linesize[0] *= -1;
110
}
111

    
112
static int raw_decode(AVCodecContext *avctx,
113
                            void *data, int *data_size,
114
                            AVPacket *avpkt)
115
{
116
    const uint8_t *buf = avpkt->data;
117
    int buf_size = avpkt->size;
118
    RawVideoContext *context = avctx->priv_data;
119

    
120
    AVFrame * frame = (AVFrame *) data;
121
    AVPicture * picture = (AVPicture *) data;
122

    
123
    frame->interlaced_frame = avctx->coded_frame->interlaced_frame;
124
    frame->top_field_first = avctx->coded_frame->top_field_first;
125

    
126
    //2bpp and 4bpp raw in avi and mov (yes this is ugly ...)
127
    if (context->buffer) {
128
        int i;
129
        uint8_t *dst = context->buffer;
130
        buf_size = context->length - 256*4;
131
        if (avctx->bits_per_coded_sample == 4){
132
            for(i=0; 2*i+1 < buf_size; i++){
133
                dst[2*i+0]= buf[i]>>4;
134
                dst[2*i+1]= buf[i]&15;
135
            }
136
        } else
137
            for(i=0; 4*i+3 < buf_size; i++){
138
                dst[4*i+0]= buf[i]>>6;
139
                dst[4*i+1]= buf[i]>>4&3;
140
                dst[4*i+2]= buf[i]>>2&3;
141
                dst[4*i+3]= buf[i]   &3;
142
            }
143
        buf= dst;
144
    }
145

    
146
    if(avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
147
       avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
148
        buf += buf_size - context->length;
149

    
150
    if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0))
151
        return -1;
152

    
153
    avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height);
154
    if((avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length) ||
155
       (avctx->pix_fmt!=PIX_FMT_PAL8 &&
156
        (av_pix_fmt_descriptors[avctx->pix_fmt].flags & PIX_FMT_PAL))){
157
        frame->data[1]= context->palette;
158
    }
159
    if (avctx->palctrl && avctx->palctrl->palette_changed) {
160
        memcpy(frame->data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
161
        avctx->palctrl->palette_changed = 0;
162
    }
163
    if(avctx->pix_fmt==PIX_FMT_BGR24 && ((frame->linesize[0]+3)&~3)*avctx->height <= buf_size)
164
        frame->linesize[0] = (frame->linesize[0]+3)&~3;
165

    
166
    if(context->flip)
167
        flip(avctx, picture);
168

    
169
    if (   avctx->codec_tag == MKTAG('Y', 'V', '1', '2')
170
        || avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
171
        FFSWAP(uint8_t *, picture->data[1], picture->data[2]);
172

    
173
    if(avctx->codec_tag == AV_RL32("yuv2") &&
174
       avctx->pix_fmt   == PIX_FMT_YUYV422) {
175
        int x, y;
176
        uint8_t *line = picture->data[0];
177
        for(y = 0; y < avctx->height; y++) {
178
            for(x = 0; x < avctx->width; x++)
179
                line[2*x + 1] ^= 0x80;
180
            line += picture->linesize[0];
181
        }
182
    }
183

    
184
    *data_size = sizeof(AVPicture);
185
    return buf_size;
186
}
187

    
188
static av_cold int raw_close_decoder(AVCodecContext *avctx)
189
{
190
    RawVideoContext *context = avctx->priv_data;
191

    
192
    av_freep(&context->buffer);
193
    return 0;
194
}
195

    
196
AVCodec rawvideo_decoder = {
197
    "rawvideo",
198
    AVMEDIA_TYPE_VIDEO,
199
    CODEC_ID_RAWVIDEO,
200
    sizeof(RawVideoContext),
201
    raw_init_decoder,
202
    NULL,
203
    raw_close_decoder,
204
    raw_decode,
205
    .long_name = NULL_IF_CONFIG_SMALL("raw video"),
206
};