mirror of https://git.ffmpeg.org/ffmpeg.git
141 lines
4.8 KiB
C
141 lines
4.8 KiB
C
/*
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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 "codec_internal.h"
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#include "mpegvideo.h"
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#include "mpegvideodec.h"
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#include "h263data.h"
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#include "h263dec.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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if (get_bits_left(&s->gb) == 64) { /* special dummy frames */
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return FRAME_SKIPPED;
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}
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/* picture header */
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if (get_bits(&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 (check_marker(s->avctx, &s->gb, "after picture_number") != 1) {
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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 H.263 id\n");
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return -1; /* H.263 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 == 0 || format == 6) {
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av_log(s->avctx, AV_LOG_ERROR, "Intel H.263 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 = AV_PICTURE_TYPE_I + get_bits1(&s->gb);
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s->h263_long_vectors = get_bits1(&s->gb);
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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 < 6) {
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s->width = ff_h263_format[format][0];
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s->height = ff_h263_format[format][1];
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s->avctx->sample_aspect_ratio.num = 12;
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s->avctx->sample_aspect_ratio.den = 11;
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} else {
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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 H.263 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) * !s->avctx->lowres;
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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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check_marker(s->avctx, &s->gb, "in dimensions");
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skip_bits(&s->gb, 9); // display height
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if(ar == 15){
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s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 8); // aspect ratio - width
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s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 8); // aspect ratio - height
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} else {
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s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[ar];
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}
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if (s->avctx->sample_aspect_ratio.num == 0)
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av_log(s->avctx, AV_LOG_ERROR, "Invalid aspect ratio.\n");
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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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if (skip_1stop_8data_bits(&s->gb) < 0)
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return AVERROR_INVALIDDATA;
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s->f_code = 1;
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ff_h263_show_pict_info(s);
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return 0;
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}
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const FFCodec ff_h263i_decoder = {
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.p.name = "h263i",
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CODEC_LONG_NAME("Intel H.263"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_H263I,
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.priv_data_size = sizeof(MpegEncContext),
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.init = ff_h263_decode_init,
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FF_CODEC_DECODE_CB(ff_h263_decode_frame),
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.close = ff_mpv_decode_close,
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.p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
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FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
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};
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