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"
26 #include "mpegvideodata.h"
28 int ff_flv_decode_picture_header(MpegEncContext *s)
30 int format, width, height;
33 if (get_bits_long(&s->gb, 17) != 1) {
34 av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
35 return AVERROR_INVALIDDATA;
37 format = get_bits(&s->gb, 5);
38 if (format != 0 && format != 1) {
39 av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n");
40 return AVERROR_INVALIDDATA;
42 s->h263_flv = format + 1;
43 s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
44 format = get_bits(&s->gb, 3);
47 width = get_bits(&s->gb, 8);
48 height = get_bits(&s->gb, 8);
51 width = get_bits(&s->gb, 16);
52 height = get_bits(&s->gb, 16);
78 if (av_image_check_size(width, height, 0, s->avctx))
79 return AVERROR(EINVAL);
83 s->pict_type = AV_PICTURE_TYPE_I + get_bits(&s->gb, 2);
84 s->droppable = s->pict_type > AV_PICTURE_TYPE_P;
86 s->pict_type = AV_PICTURE_TYPE_P;
88 skip_bits1(&s->gb); /* deblocking flag */
89 s->chroma_qscale = s->qscale = get_bits(&s->gb, 5);
93 s->unrestricted_mv = 1;
94 s->h263_long_vectors = 0;
97 if (skip_1stop_8data_bits(&s->gb) < 0)
98 return AVERROR_INVALIDDATA;
103 s->avctx->sample_aspect_ratio= (AVRational){1,2};
105 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
106 av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n",
107 s->droppable ? 'D' : av_get_picture_type_char(s->pict_type),
108 s->h263_flv - 1, s->qscale, s->picture_number);
111 s->y_dc_scale_table = s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
116 AVCodec ff_flv_decoder = {
118 .long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
119 .type = AVMEDIA_TYPE_VIDEO,
120 .id = AV_CODEC_ID_FLV1,
121 .priv_data_size = sizeof(MpegEncContext),
122 .init = ff_h263_decode_init,
123 .close = ff_h263_decode_end,
124 .decode = ff_h263_decode_frame,
125 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
126 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
128 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,