aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/bitpacked.c
blob: 23e82c69b59db4b22abc532c3914271dac12e453 (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
/*
 * Unpack bit-packed streams to formats supported by FFmpeg
 * Copyright (c) 2017 Savoir-faire Linux, Inc
 *
 * 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
 */

/* Development sponsored by CBC/Radio-Canada */

/**
 * @file
 * Bitpacked
 */

#include "avcodec.h"
#include "internal.h"
#include "get_bits.h"
#include "libavutil/imgutils.h"

struct BitpackedContext {
    int (*decode)(AVCodecContext *avctx, AVFrame *frame,
                  const AVPacket *pkt);
};

/* For this format, it's a simple passthrough */
static int bitpacked_decode_uyvy422(AVCodecContext *avctx, AVFrame *frame,
                                    const AVPacket *avpkt)
{
    int ret;

    /* there is no need to copy as the data already match
     * a known pixel format */
    frame->buf[0] = av_buffer_ref(avpkt->buf);
    ret = av_image_fill_arrays(frame->data, frame->linesize, avpkt->data,
                               avctx->pix_fmt, avctx->width, avctx->height, 1);
    if (ret < 0) {
        av_buffer_unref(&frame->buf[0]);
        return ret;
    }

    return 0;
}

static int bitpacked_decode_yuv422p10(AVCodecContext *avctx, AVFrame *frame,
                                      const AVPacket *avpkt)
{
    uint64_t frame_size = (uint64_t)avctx->width * (uint64_t)avctx->height * 20;
    uint64_t packet_size = (uint64_t)avpkt->size * 8;
    GetBitContext bc;
    uint16_t *y, *u, *v;
    int ret, i, j;

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

    if (frame_size > packet_size)
        return AVERROR_INVALIDDATA;

    if (avctx->width % 2)
        return AVERROR_PATCHWELCOME;

    ret = init_get_bits(&bc, avpkt->data, avctx->width * avctx->height * 20);
    if (ret)
        return ret;

    for (i = 0; i < avctx->height; i++) {
        y = (uint16_t*)(frame->data[0] + i * frame->linesize[0]);
        u = (uint16_t*)(frame->data[1] + i * frame->linesize[1]);
        v = (uint16_t*)(frame->data[2] + i * frame->linesize[2]);

        for (j = 0; j < avctx->width; j += 2) {
            *u++ = get_bits(&bc, 10);
            *y++ = get_bits(&bc, 10);
            *v++ = get_bits(&bc, 10);
            *y++ = get_bits(&bc, 10);
        }
    }

    return 0;
}

static av_cold int bitpacked_init_decoder(AVCodecContext *avctx)
{
    struct BitpackedContext *bc = avctx->priv_data;

    if (!avctx->codec_tag || !avctx->width || !avctx->height)
        return AVERROR_INVALIDDATA;

    if (avctx->codec_tag == MKTAG('U', 'Y', 'V', 'Y')) {
        if (avctx->bits_per_coded_sample == 16 &&
            avctx->pix_fmt == AV_PIX_FMT_UYVY422)
            bc->decode = bitpacked_decode_uyvy422;
        else if (avctx->bits_per_coded_sample == 20 &&
                 avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
            bc->decode = bitpacked_decode_yuv422p10;
        else
            return AVERROR_INVALIDDATA;
    } else {
        return AVERROR_INVALIDDATA;
    }

    return 0;
}

static int bitpacked_decode(AVCodecContext *avctx, void *data, int *got_frame,
                            AVPacket *avpkt)
{
    struct BitpackedContext *bc = avctx->priv_data;
    int buf_size = avpkt->size;
    AVFrame *frame = data;
    int res;

    frame->pict_type = AV_PICTURE_TYPE_I;
    frame->key_frame = 1;

    res = bc->decode(avctx, frame, avpkt);
    if (res)
        return res;

    *got_frame = 1;
    return buf_size;

}

AVCodec ff_bitpacked_decoder = {
    .name   = "bitpacked",
    .long_name = NULL_IF_CONFIG_SMALL("Bitpacked"),
    .type = AVMEDIA_TYPE_VIDEO,
    .id = AV_CODEC_ID_BITPACKED,
    .priv_data_size        = sizeof(struct BitpackedContext),
    .init = bitpacked_init_decoder,
    .decode = bitpacked_decode,
    .capabilities = AV_CODEC_CAP_EXPERIMENTAL,
    .codec_tags     = (const uint32_t []){
        MKTAG('U', 'Y', 'V', 'Y'),
        FF_CODEC_TAGS_END,
    },
};