aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/dpx.c
blob: 59845c700d5846dd281d0ecb1556deeb5954b073 (plain) (blame)
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
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
/*
 * DPX (.dpx) image decoder
 * Copyright (c) 2009 Jimmy Christensen
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "bytestream.h"
#include "avcodec.h"
#include "internal.h"

static unsigned int read16(const uint8_t **ptr, int is_big)
{
    unsigned int temp;
    if (is_big) {
        temp = AV_RB16(*ptr);
    } else {
        temp = AV_RL16(*ptr);
    }
    *ptr += 2;
    return temp;
}

static unsigned int read32(const uint8_t **ptr, int is_big)
{
    unsigned int temp;
    if (is_big) {
        temp = AV_RB32(*ptr);
    } else {
        temp = AV_RL32(*ptr);
    }
    *ptr += 4;
    return temp;
}

static uint16_t read10in32(const uint8_t **ptr, uint32_t * lbuf,
                                  int * n_datum, int is_big)
{
    if (*n_datum)
        (*n_datum)--;
    else {
        *lbuf = read32(ptr, is_big);
        *n_datum = 2;
    }

    *lbuf = (*lbuf << 10) | (*lbuf >> 22);

    return *lbuf & 0x3FF;
}

static int decode_frame(AVCodecContext *avctx,
                        void *data,
                        int *got_frame,
                        AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size       = avpkt->size;
    AVFrame *const p = data;
    uint8_t *ptr[AV_NUM_DATA_POINTERS];

    unsigned int offset;
    int magic_num, endian;
    int x, y, i, ret;
    int w, h, bits_per_color, descriptor, elements, packing, total_size;

    unsigned int rgbBuffer = 0;
    int n_datum = 0;

    if (avpkt->size <= 1634) {
        av_log(avctx, AV_LOG_ERROR, "Packet too small for DPX header\n");
        return AVERROR_INVALIDDATA;
    }

    magic_num = AV_RB32(buf);
    buf += 4;

    /* Check if the files "magic number" is "SDPX" which means it uses
     * big-endian or XPDS which is for little-endian files */
    if (magic_num == AV_RL32("SDPX")) {
        endian = 0;
    } else if (magic_num == AV_RB32("SDPX")) {
        endian = 1;
    } else {
        av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n");
        return AVERROR_INVALIDDATA;
    }

    offset = read32(&buf, endian);
    if (avpkt->size <= offset) {
        av_log(avctx, AV_LOG_ERROR, "Invalid data start offset\n");
        return AVERROR_INVALIDDATA;
    }
    // Need to end in 0x304 offset from start of file
    buf = avpkt->data + 0x304;
    w = read32(&buf, endian);
    h = read32(&buf, endian);
    if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
        return ret;

    if (w != avctx->width || h != avctx->height)
        avcodec_set_dimensions(avctx, w, h);

    // Need to end in 0x320 to read the descriptor
    buf += 20;
    descriptor = buf[0];

    // Need to end in 0x323 to read the bits per color
    buf += 3;
    avctx->bits_per_raw_sample =
    bits_per_color = buf[0];
    buf++;
    packing = read16(&buf, endian);

    buf += 822;
    avctx->sample_aspect_ratio.num = read32(&buf, endian);
    avctx->sample_aspect_ratio.den = read32(&buf, endian);
    if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0)
        av_reduce(&avctx->sample_aspect_ratio.num, &avctx->sample_aspect_ratio.den,
                   avctx->sample_aspect_ratio.num,  avctx->sample_aspect_ratio.den,
                  0x10000);
    else
        avctx->sample_aspect_ratio = (AVRational){ 0, 1 };

    switch (descriptor) {
        case 51: // RGBA
            elements = 4;
            break;
        case 50: // RGB
            elements = 3;
            break;
        default:
            av_log(avctx, AV_LOG_ERROR, "Unsupported descriptor %d\n", descriptor);
            return AVERROR_INVALIDDATA;
    }

    switch (bits_per_color) {
        case 8:
            if (elements == 4) {
                avctx->pix_fmt = AV_PIX_FMT_RGBA;
            } else {
                avctx->pix_fmt = AV_PIX_FMT_RGB24;
            }
            total_size = avctx->width * avctx->height * elements;
            break;
        case 10:
            if (!packing) {
                av_log(avctx, AV_LOG_ERROR, "Packing to 32bit required\n");
                return -1;
            }
            avctx->pix_fmt = AV_PIX_FMT_GBRP10;
            total_size = (avctx->width * elements + 2) / 3 * 4 * avctx->height;
            break;
        case 12:
            if (!packing) {
                av_log(avctx, AV_LOG_ERROR, "Packing to 16bit required\n");
                return -1;
            }
            avctx->pix_fmt = AV_PIX_FMT_GBRP12;
            total_size = 2 * avctx->width * avctx->height * elements;
            break;
        case 16:
            if (endian) {
                avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_RGBA64BE : AV_PIX_FMT_RGB48BE;
            } else {
                avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_RGBA64LE : AV_PIX_FMT_RGB48LE;
            }
            total_size = 2 * avctx->width * avctx->height * elements;
            break;
        default:
            av_log(avctx, AV_LOG_ERROR, "Unsupported color depth : %d\n", bits_per_color);
            return AVERROR_INVALIDDATA;
    }

    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
        return ret;

    // Move pointer to offset from start of file
    buf =  avpkt->data + offset;

    for (i=0; i<AV_NUM_DATA_POINTERS; i++)
        ptr[i] = p->data[i];

    if (total_size + (int64_t)offset > avpkt->size) {
        av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");
        return AVERROR_INVALIDDATA;
    }
    switch (bits_per_color) {
    case 10:
        for (x = 0; x < avctx->height; x++) {
            uint16_t *dst[3] = {(uint16_t*)ptr[0],
                                (uint16_t*)ptr[1],
                                (uint16_t*)ptr[2]};
            for (y = 0; y < avctx->width; y++) {
                *dst[2]++ = read10in32(&buf, &rgbBuffer,
                                       &n_datum, endian);
                *dst[0]++ = read10in32(&buf, &rgbBuffer,
                                       &n_datum, endian);
                *dst[1]++ = read10in32(&buf, &rgbBuffer,
                                       &n_datum, endian);
                // For 10 bit, ignore alpha
                if (elements == 4)
                    read10in32(&buf, &rgbBuffer,
                               &n_datum, endian);
            }
            n_datum = 0;
            for (i = 0; i < 3; i++)
                ptr[i] += p->linesize[i];
        }
        break;
    case 12:
        for (x = 0; x < avctx->height; x++) {
            uint16_t *dst[3] = {(uint16_t*)ptr[0],
                                (uint16_t*)ptr[1],
                                (uint16_t*)ptr[2]};
            for (y = 0; y < avctx->width; y++) {
                *dst[2] = read16(&buf, endian) >> 4;
                dst[2]++;
                *dst[0] = read16(&buf, endian) >> 4;
                dst[0]++;
                *dst[1] = read16(&buf, endian) >> 4;
                dst[1]++;
                // For 12 bit, ignore alpha
                if (elements == 4)
                    buf += 2;
            }
            for (i = 0; i < 3; i++)
                ptr[i] += p->linesize[i];
        }
        break;
    case 16:
        elements *= 2;
    case 8:
        av_image_copy_plane(ptr[0], p->linesize[0],
                            buf, elements * avctx->width,
                            elements * avctx->width, avctx->height);
        break;
    }

    *got_frame = 1;

    return buf_size;
}

AVCodec ff_dpx_decoder = {
    .name           = "dpx",
    .long_name      = NULL_IF_CONFIG_SMALL("DPX image"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_DPX,
    .decode         = decode_frame,
    .capabilities   = CODEC_CAP_DR1,
};