mirror of
https://github.com/FFmpeg/FFmpeg.git
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737eb5976f
It is pretty hopeless that other considerable projects will adopt libavutil alone in other projects. Projects that need small footprint are better off with more specialized libraries such as gnulib or rather just copy the necessary parts that they need. With this in mind, nobody is helped by having libavutil and libavcore split. In order to ease maintenance inside and around FFmpeg and to reduce confusion where to put common code, avcore's functionality is merged (back) to avutil. Signed-off-by: Reinhard Tartler <siretart@tauware.de>
135 lines
3.5 KiB
C
135 lines
3.5 KiB
C
/*
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* FLV decoding.
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 = FF_I_TYPE + get_bits(&s->gb, 2);
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s->dropable= s->pict_type > FF_P_TYPE;
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if (s->dropable)
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s->pict_type = FF_P_TYPE;
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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_pict_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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