mirror of https://git.ffmpeg.org/ffmpeg.git
139 lines
4.7 KiB
C
139 lines
4.7 KiB
C
/*
|
|
* 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"
|
|
#include "h263.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 == 0 || format == 6) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "Intel H263 free format not supported\n");
|
|
return -1;
|
|
}
|
|
s->h263_plus = 0;
|
|
|
|
s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb);
|
|
|
|
s->h263_long_vectors = get_bits1(&s->gb);
|
|
|
|
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->unrestricted_mv = s->obmc || s->h263_long_vectors;
|
|
s->pb_frame = get_bits1(&s->gb);
|
|
|
|
if (format < 6) {
|
|
s->width = ff_h263_format[format][0];
|
|
s->height = ff_h263_format[format][1];
|
|
s->avctx->sample_aspect_ratio.num = 12;
|
|
s->avctx->sample_aspect_ratio.den = 11;
|
|
} else {
|
|
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) * !s->avctx->lowres;
|
|
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){
|
|
s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 8); // aspect ratio - width
|
|
s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 8); // aspect ratio - height
|
|
} else {
|
|
s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[ar];
|
|
}
|
|
if (s->avctx->sample_aspect_ratio.num == 0)
|
|
av_log(s->avctx, AV_LOG_ERROR, "Invalid aspect ratio.\n");
|
|
}
|
|
|
|
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;
|
|
|
|
ff_h263_show_pict_info(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_h263i_decoder = {
|
|
.name = "h263i",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = CODEC_ID_H263I,
|
|
.priv_data_size = sizeof(MpegEncContext),
|
|
.init = ff_h263_decode_init,
|
|
.close = ff_h263_decode_end,
|
|
.decode = ff_h263_decode_frame,
|
|
.capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Intel H.263"),
|
|
.pix_fmts = ff_pixfmt_list_420,
|
|
};
|