3 * This file is part of FFmpeg.
5 * FFmpeg is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
10 * FFmpeg is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with FFmpeg; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 #include "mpegvideo.h"
23 #include "libavcore/imgutils.h"
25 void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last){
26 int is11 = get_bits1(gb);
27 *last = get_bits1(gb);
28 *run = get_bits(gb, 6);
30 *level = get_sbits(gb, 11);
32 *level = get_sbits(gb, 7);
36 int ff_flv_decode_picture_header(MpegEncContext *s)
38 int format, width, height;
41 if (get_bits_long(&s->gb, 17) != 1) {
42 av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
45 format = get_bits(&s->gb, 5);
46 if (format != 0 && format != 1) {
47 av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n");
50 s->h263_flv = format+1;
51 s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
52 format = get_bits(&s->gb, 3);
55 width = get_bits(&s->gb, 8);
56 height = get_bits(&s->gb, 8);
59 width = get_bits(&s->gb, 16);
60 height = get_bits(&s->gb, 16);
86 if(av_check_image_size(width, height, 0, s->avctx))
91 s->pict_type = FF_I_TYPE + get_bits(&s->gb, 2);
92 s->dropable= s->pict_type > FF_P_TYPE;
94 s->pict_type = FF_P_TYPE;
96 skip_bits1(&s->gb); /* deblocking flag */
97 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
101 s->unrestricted_mv = 1;
102 s->h263_long_vectors = 0;
105 while (get_bits1(&s->gb) != 0) {
106 skip_bits(&s->gb, 8);
110 if(s->avctx->debug & FF_DEBUG_PICT_INFO){
111 av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n",
112 s->dropable ? 'D' : av_get_pict_type_char(s->pict_type), s->h263_flv-1, s->qscale, s->picture_number);
116 s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
121 AVCodec flv_decoder = {
125 sizeof(MpegEncContext),
129 ff_h263_decode_frame,
130 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
132 .long_name= NULL_IF_CONFIG_SMALL("Flash Video (FLV) / Sorenson Spark / Sorenson H.263"),
133 .pix_fmts= ff_pixfmt_list_420,