4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 typedef struct AuraDecodeContext
{
29 AVCodecContext
*avctx
;
33 static av_cold
int aura_decode_init(AVCodecContext
*avctx
)
35 AuraDecodeContext
*s
= avctx
->priv_data
;
38 /* width needs to be divisible by 4 for this codec to work */
39 if (avctx
->width
& 0x3)
41 avctx
->pix_fmt
= PIX_FMT_YUV422P
;
46 static int aura_decode_frame(AVCodecContext
*avctx
,
47 void *data
, int *data_size
,
50 AuraDecodeContext
*s
=avctx
->priv_data
;
55 const uint8_t *buf
= pkt
->data
;
57 /* prediction error tables (make it clear that they are signed values) */
58 const int8_t *delta_table
= (const int8_t*)buf
+ 16;
60 if (pkt
->size
!= 48 + avctx
->height
* avctx
->width
) {
61 av_log(avctx
, AV_LOG_ERROR
, "got a buffer with %d bytes when %d were expected\n",
62 pkt
->size
, 48 + avctx
->height
* avctx
->width
);
66 /* pixel data starts 48 bytes in, after 3x16-byte tables */
70 avctx
->release_buffer(avctx
, &s
->frame
);
72 s
->frame
.buffer_hints
= FF_BUFFER_HINTS_VALID
;
73 s
->frame
.reference
= 0;
74 if(avctx
->get_buffer(avctx
, &s
->frame
) < 0) {
75 av_log(avctx
, AV_LOG_ERROR
, "get_buffer() failed\n");
83 /* iterate through each line in the height */
84 for (y
= 0; y
< avctx
->height
; y
++) {
85 /* reset predictors */
91 Y
[1] = Y
[0] + delta_table
[val
& 0xF];
94 /* iterate through the remaining pixel groups (4 pixels/group) */
95 for (x
= 1; x
< (avctx
->width
>> 1); x
++) {
97 U
[0] = U
[-1] + delta_table
[val
>> 4];
98 Y
[0] = Y
[-1] + delta_table
[val
& 0xF];
100 V
[0] = V
[-1] + delta_table
[val
>> 4];
101 Y
[1] = Y
[ 0] + delta_table
[val
& 0xF];
104 Y
+= s
->frame
.linesize
[0] - avctx
->width
;
105 U
+= s
->frame
.linesize
[1] - (avctx
->width
>> 1);
106 V
+= s
->frame
.linesize
[2] - (avctx
->width
>> 1);
109 *data_size
=sizeof(AVFrame
);
110 *(AVFrame
*)data
= s
->frame
;
115 static av_cold
int aura_decode_end(AVCodecContext
*avctx
)
117 AuraDecodeContext
*s
= avctx
->priv_data
;
119 if (s
->frame
.data
[0])
120 avctx
->release_buffer(avctx
, &s
->frame
);
125 AVCodec aura2_decoder
= {
129 sizeof(AuraDecodeContext
),
136 .long_name
= NULL_IF_CONFIG_SMALL("Auravision Aura 2"),