4 * This file is part of Libav.
6 * Libav 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 * Libav 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 Libav; 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 void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last)
29 int is11 = get_bits1(gb);
30 *last = get_bits1(gb);
31 *run = get_bits(gb, 6);
33 *level = get_sbits(gb, 11);
35 *level = get_sbits(gb, 7);
38 int ff_flv_decode_picture_header(MpegEncContext *s)
40 int format, width, height;
43 if (get_bits_long(&s->gb, 17) != 1) {
44 av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
47 format = get_bits(&s->gb, 5);
48 if (format != 0 && format != 1) {
49 av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n");
52 s->h263_flv = format + 1;
53 s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
54 format = get_bits(&s->gb, 3);
57 width = get_bits(&s->gb, 8);
58 height = get_bits(&s->gb, 8);
61 width = get_bits(&s->gb, 16);
62 height = get_bits(&s->gb, 16);
88 if (av_image_check_size(width, height, 0, s->avctx))
93 s->pict_type = AV_PICTURE_TYPE_I + get_bits(&s->gb, 2);
94 s->droppable = s->pict_type > AV_PICTURE_TYPE_P;
96 s->pict_type = AV_PICTURE_TYPE_P;
98 skip_bits1(&s->gb); /* deblocking flag */
99 s->chroma_qscale = s->qscale = get_bits(&s->gb, 5);
103 s->unrestricted_mv = 1;
104 s->h263_long_vectors = 0;
107 while (get_bits1(&s->gb) != 0)
108 skip_bits(&s->gb, 8);
111 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
112 av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n",
113 s->droppable ? 'D' : av_get_picture_type_char(s->pict_type),
114 s->h263_flv - 1, s->qscale, s->picture_number);
117 s->y_dc_scale_table = s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
122 AVCodec ff_flv_decoder = {
124 .long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
125 .type = AVMEDIA_TYPE_VIDEO,
126 .id = AV_CODEC_ID_FLV1,
127 .priv_data_size = sizeof(MpegEncContext),
128 .init = ff_h263_decode_init,
129 .close = ff_h263_decode_end,
130 .decode = ff_h263_decode_frame,
131 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
132 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,