mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 21054 to svn://svn.ffmpeg.org/ffmpeg/trunkrelease/0.6
Michael Niedermayer
15 years ago
parent
515a543809
commit
d7525cba23
5 changed files with 137 additions and 114 deletions
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/*
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* H.263i decoder |
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* |
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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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/* don't understand why they choose a different header ! */ |
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int ff_intel_h263_decode_picture_header(MpegEncContext *s) |
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{ |
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int format; |
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/* picture header */ |
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if (get_bits_long(&s->gb, 22) != 0x20) { |
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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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s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */ |
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if (get_bits1(&s->gb) != 1) { |
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av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n"); |
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return -1; /* marker */ |
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} |
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if (get_bits1(&s->gb) != 0) { |
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av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n"); |
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return -1; /* h263 id */ |
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} |
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skip_bits1(&s->gb); /* split screen off */ |
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skip_bits1(&s->gb); /* camera off */ |
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skip_bits1(&s->gb); /* freeze picture release off */ |
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format = get_bits(&s->gb, 3); |
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if (format != 7) { |
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av_log(s->avctx, AV_LOG_ERROR, "Intel H263 free format not supported\n"); |
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return -1; |
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} |
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s->h263_plus = 0; |
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s->pict_type = FF_I_TYPE + get_bits1(&s->gb); |
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s->unrestricted_mv = get_bits1(&s->gb); |
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s->h263_long_vectors = s->unrestricted_mv; |
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if (get_bits1(&s->gb) != 0) { |
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av_log(s->avctx, AV_LOG_ERROR, "SAC not supported\n"); |
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return -1; /* SAC: off */ |
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} |
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s->obmc= get_bits1(&s->gb); |
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s->pb_frame = get_bits1(&s->gb); |
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if(format == 7){ |
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format = get_bits(&s->gb, 3); |
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if(format == 0 || format == 7){ |
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av_log(s->avctx, AV_LOG_ERROR, "Wrong Intel H263 format\n"); |
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return -1; |
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} |
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if(get_bits(&s->gb, 2)) |
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av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n"); |
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s->loop_filter = get_bits1(&s->gb); |
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if(get_bits1(&s->gb)) |
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av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n"); |
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if(get_bits1(&s->gb)) |
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s->pb_frame = 2; |
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if(get_bits(&s->gb, 5)) |
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av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n"); |
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if(get_bits(&s->gb, 5) != 1) |
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av_log(s->avctx, AV_LOG_ERROR, "Invalid marker\n"); |
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} |
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if(format == 6){ |
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int ar = get_bits(&s->gb, 4); |
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skip_bits(&s->gb, 9); // display width
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skip_bits1(&s->gb); |
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skip_bits(&s->gb, 9); // display height
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if(ar == 15){ |
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skip_bits(&s->gb, 8); // aspect ratio - width
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skip_bits(&s->gb, 8); // aspect ratio - height
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} |
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} |
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s->chroma_qscale= s->qscale = get_bits(&s->gb, 5); |
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skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */ |
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if(s->pb_frame){ |
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skip_bits(&s->gb, 3); //temporal reference for B-frame
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skip_bits(&s->gb, 2); //dbquant
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} |
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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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s->y_dc_scale_table= |
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s->c_dc_scale_table= ff_mpeg1_dc_scale_table; |
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if(s->avctx->debug&FF_DEBUG_PICT_INFO) |
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ff_h263_show_pict_info(s); |
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return 0; |
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} |
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AVCodec h263i_decoder = { |
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"h263i", |
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CODEC_TYPE_VIDEO, |
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CODEC_ID_H263I, |
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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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.long_name = NULL_IF_CONFIG_SMALL("Intel H.263"), |
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.pix_fmts= ff_pixfmt_list_420, |
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}; |
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