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
21 #include "libavutil/imgutils.h"
25 #include "mpegvideo.h"
27 int ff_flv_decode_picture_header(MpegEncContext
*s
)
29 int format
, width
, height
;
32 if (get_bits_long(&s
->gb
, 17) != 1) {
33 av_log(s
->avctx
, AV_LOG_ERROR
, "Bad picture start code\n");
34 return AVERROR_INVALIDDATA
;
36 format
= get_bits(&s
->gb
, 5);
37 if (format
!= 0 && format
!= 1) {
38 av_log(s
->avctx
, AV_LOG_ERROR
, "Bad picture format\n");
39 return AVERROR_INVALIDDATA
;
41 s
->h263_flv
= format
+ 1;
42 s
->picture_number
= get_bits(&s
->gb
, 8); /* picture timestamp */
43 format
= get_bits(&s
->gb
, 3);
46 width
= get_bits(&s
->gb
, 8);
47 height
= get_bits(&s
->gb
, 8);
50 width
= get_bits(&s
->gb
, 16);
51 height
= get_bits(&s
->gb
, 16);
77 if (av_image_check_size(width
, height
, 0, s
->avctx
))
78 return AVERROR(EINVAL
);
82 s
->pict_type
= AV_PICTURE_TYPE_I
+ get_bits(&s
->gb
, 2);
83 s
->droppable
= s
->pict_type
> AV_PICTURE_TYPE_P
;
85 s
->pict_type
= AV_PICTURE_TYPE_P
;
87 skip_bits1(&s
->gb
); /* deblocking flag */
88 s
->chroma_qscale
= s
->qscale
= get_bits(&s
->gb
, 5);
92 s
->unrestricted_mv
= 1;
93 s
->h263_long_vectors
= 0;
96 if (skip_1stop_8data_bits(&s
->gb
) < 0)
97 return AVERROR_INVALIDDATA
;
102 s
->avctx
->sample_aspect_ratio
= (AVRational
){1,2};
104 if (s
->avctx
->debug
& FF_DEBUG_PICT_INFO
) {
105 av_log(s
->avctx
, AV_LOG_DEBUG
, "%c esc_type:%d, qp:%d num:%d\n",
106 s
->droppable
? 'D' : av_get_picture_type_char(s
->pict_type
),
107 s
->h263_flv
- 1, s
->qscale
, s
->picture_number
);
110 s
->y_dc_scale_table
= s
->c_dc_scale_table
= ff_mpeg1_dc_scale_table
;
115 AVCodec ff_flv_decoder
= {
117 .long_name
= NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
118 .type
= AVMEDIA_TYPE_VIDEO
,
119 .id
= AV_CODEC_ID_FLV1
,
120 .priv_data_size
= sizeof(MpegEncContext
),
121 .init
= ff_h263_decode_init
,
122 .close
= ff_h263_decode_end
,
123 .decode
= ff_h263_decode_frame
,
124 .capabilities
= CODEC_CAP_DRAW_HORIZ_BAND
| CODEC_CAP_DR1
,
126 .pix_fmts
= (const enum AVPixelFormat
[]) { AV_PIX_FMT_YUV420P
,