From d7525cba23654452346c1c16456e53b3bd206ba0 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Thu, 7 Jan 2010 06:25:41 +0000 Subject: Split out intel H263 decoder. Originally committed as revision 21054 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/intelh263dec.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 131 insertions(+) create mode 100644 libavcodec/intelh263dec.c (limited to 'libavcodec/intelh263dec.c') diff --git a/libavcodec/intelh263dec.c b/libavcodec/intelh263dec.c new file mode 100644 index 0000000000..4a0078b8c4 --- /dev/null +++ b/libavcodec/intelh263dec.c @@ -0,0 +1,131 @@ +/* + * H.263i decoder + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "mpegvideo.h" + +/* don't understand why they choose a different header ! */ +int ff_intel_h263_decode_picture_header(MpegEncContext *s) +{ + int format; + + /* picture header */ + if (get_bits_long(&s->gb, 22) != 0x20) { + av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n"); + return -1; + } + s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */ + + if (get_bits1(&s->gb) != 1) { + av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n"); + return -1; /* marker */ + } + if (get_bits1(&s->gb) != 0) { + av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n"); + return -1; /* h263 id */ + } + skip_bits1(&s->gb); /* split screen off */ + skip_bits1(&s->gb); /* camera off */ + skip_bits1(&s->gb); /* freeze picture release off */ + + format = get_bits(&s->gb, 3); + if (format != 7) { + av_log(s->avctx, AV_LOG_ERROR, "Intel H263 free format not supported\n"); + return -1; + } + s->h263_plus = 0; + + s->pict_type = FF_I_TYPE + get_bits1(&s->gb); + + s->unrestricted_mv = get_bits1(&s->gb); + s->h263_long_vectors = s->unrestricted_mv; + + if (get_bits1(&s->gb) != 0) { + av_log(s->avctx, AV_LOG_ERROR, "SAC not supported\n"); + return -1; /* SAC: off */ + } + s->obmc= get_bits1(&s->gb); + s->pb_frame = get_bits1(&s->gb); + + if(format == 7){ + format = get_bits(&s->gb, 3); + if(format == 0 || format == 7){ + av_log(s->avctx, AV_LOG_ERROR, "Wrong Intel H263 format\n"); + return -1; + } + if(get_bits(&s->gb, 2)) + av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n"); + s->loop_filter = get_bits1(&s->gb); + if(get_bits1(&s->gb)) + av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n"); + if(get_bits1(&s->gb)) + s->pb_frame = 2; + if(get_bits(&s->gb, 5)) + av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n"); + if(get_bits(&s->gb, 5) != 1) + av_log(s->avctx, AV_LOG_ERROR, "Invalid marker\n"); + } + if(format == 6){ + int ar = get_bits(&s->gb, 4); + skip_bits(&s->gb, 9); // display width + skip_bits1(&s->gb); + skip_bits(&s->gb, 9); // display height + if(ar == 15){ + skip_bits(&s->gb, 8); // aspect ratio - width + skip_bits(&s->gb, 8); // aspect ratio - height + } + } + + s->chroma_qscale= s->qscale = get_bits(&s->gb, 5); + skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */ + + if(s->pb_frame){ + skip_bits(&s->gb, 3); //temporal reference for B-frame + skip_bits(&s->gb, 2); //dbquant + } + + /* PEI */ + while (get_bits1(&s->gb) != 0) { + skip_bits(&s->gb, 8); + } + s->f_code = 1; + + s->y_dc_scale_table= + s->c_dc_scale_table= ff_mpeg1_dc_scale_table; + + if(s->avctx->debug&FF_DEBUG_PICT_INFO) + ff_h263_show_pict_info(s); + + return 0; +} + +AVCodec h263i_decoder = { + "h263i", + CODEC_TYPE_VIDEO, + CODEC_ID_H263I, + sizeof(MpegEncContext), + ff_h263_decode_init, + NULL, + ff_h263_decode_end, + ff_h263_decode_frame, + CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("Intel H.263"), + .pix_fmts= ff_pixfmt_list_420, +}; + -- cgit v1.2.3