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https://github.com/FFmpeg/FFmpeg.git
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135 lines
3.6 KiB
C
135 lines
3.6 KiB
C
/*
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* FLV decoding.
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "mpegvideo.h"
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#include "h263.h"
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#include "flv.h"
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#include "libavutil/imgutils.h"
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void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last){
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int is11 = get_bits1(gb);
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*last = get_bits1(gb);
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*run = get_bits(gb, 6);
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if(is11){
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*level = get_sbits(gb, 11);
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} else {
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*level = get_sbits(gb, 7);
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}
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}
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int ff_flv_decode_picture_header(MpegEncContext *s)
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{
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int format, width, height;
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/* picture header */
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if (get_bits_long(&s->gb, 17) != 1) {
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av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
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return -1;
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}
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format = get_bits(&s->gb, 5);
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if (format != 0 && format != 1) {
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av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n");
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return -1;
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}
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s->h263_flv = format+1;
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s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
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format = get_bits(&s->gb, 3);
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switch (format) {
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case 0:
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width = get_bits(&s->gb, 8);
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height = get_bits(&s->gb, 8);
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break;
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case 1:
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width = get_bits(&s->gb, 16);
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height = get_bits(&s->gb, 16);
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break;
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case 2:
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width = 352;
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height = 288;
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break;
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case 3:
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width = 176;
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height = 144;
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break;
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case 4:
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width = 128;
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height = 96;
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break;
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case 5:
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width = 320;
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height = 240;
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break;
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case 6:
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width = 160;
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height = 120;
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break;
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default:
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width = height = 0;
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break;
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}
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if(av_image_check_size(width, height, 0, s->avctx))
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return -1;
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s->width = width;
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s->height = height;
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s->pict_type = AV_PICTURE_TYPE_I + get_bits(&s->gb, 2);
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s->dropable= s->pict_type > AV_PICTURE_TYPE_P;
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if (s->dropable)
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s->pict_type = AV_PICTURE_TYPE_P;
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skip_bits1(&s->gb); /* deblocking flag */
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s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
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s->h263_plus = 0;
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s->unrestricted_mv = 1;
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s->h263_long_vectors = 0;
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/* PEI */
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while (get_bits1(&s->gb) != 0) {
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skip_bits(&s->gb, 8);
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}
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s->f_code = 1;
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if(s->avctx->debug & FF_DEBUG_PICT_INFO){
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av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n",
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s->dropable ? 'D' : av_get_picture_type_char(s->pict_type), s->h263_flv-1, s->qscale, s->picture_number);
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}
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s->y_dc_scale_table=
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s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
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return 0;
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}
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AVCodec ff_flv_decoder = {
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"flv",
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AVMEDIA_TYPE_VIDEO,
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CODEC_ID_FLV1,
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sizeof(MpegEncContext),
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ff_h263_decode_init,
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NULL,
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ff_h263_decode_end,
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ff_h263_decode_frame,
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CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
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.max_lowres= 3,
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.long_name= NULL_IF_CONFIG_SMALL("Flash Video (FLV) / Sorenson Spark / Sorenson H.263"),
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.pix_fmts= ff_pixfmt_list_420,
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};
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