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"
24 void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last){
25 int is11 = get_bits1(gb);
26 *last = get_bits1(gb);
27 *run = get_bits(gb, 6);
29 *level = get_sbits(gb, 11);
31 *level = get_sbits(gb, 7);
35 int ff_flv_decode_picture_header(MpegEncContext *s)
37 int format, width, height;
40 if (get_bits_long(&s->gb, 17) != 1) {
41 av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
44 format = get_bits(&s->gb, 5);
45 if (format != 0 && format != 1) {
46 av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n");
49 s->h263_flv = format+1;
50 s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
51 format = get_bits(&s->gb, 3);
54 width = get_bits(&s->gb, 8);
55 height = get_bits(&s->gb, 8);
58 width = get_bits(&s->gb, 16);
59 height = get_bits(&s->gb, 16);
85 if(avcodec_check_dimensions(s->avctx, width, height))
90 s->pict_type = FF_I_TYPE + get_bits(&s->gb, 2);
91 s->dropable= s->pict_type > FF_P_TYPE;
93 s->pict_type = FF_P_TYPE;
95 skip_bits1(&s->gb); /* deblocking flag */
96 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
100 s->unrestricted_mv = 1;
101 s->h263_long_vectors = 0;
104 while (get_bits1(&s->gb) != 0) {
105 skip_bits(&s->gb, 8);
109 if(s->avctx->debug & FF_DEBUG_PICT_INFO){
110 av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n",
111 s->dropable ? 'D' : av_get_pict_type_char(s->pict_type), s->h263_flv-1, s->qscale, s->picture_number);
115 s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
120 AVCodec flv_decoder = {
124 sizeof(MpegEncContext),
128 ff_h263_decode_frame,
129 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
131 .long_name= NULL_IF_CONFIG_SMALL("Flash Video (FLV) / Sorenson Spark / Sorenson H.263"),
132 .pix_fmts= ff_pixfmt_list_420,