mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
136 lines
3.8 KiB
C
136 lines
3.8 KiB
C
/*
|
|
* FLV decoding.
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; 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"
|
|
#include "flv.h"
|
|
#include "libavutil/imgutils.h"
|
|
|
|
void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last)
|
|
{
|
|
int is11 = get_bits1(gb);
|
|
*last = get_bits1(gb);
|
|
*run = get_bits(gb, 6);
|
|
if (is11) {
|
|
*level = get_sbits(gb, 11);
|
|
} else {
|
|
*level = get_sbits(gb, 7);
|
|
}
|
|
}
|
|
|
|
int ff_flv_decode_picture_header(MpegEncContext *s)
|
|
{
|
|
int format, width, height;
|
|
|
|
/* picture header */
|
|
if (get_bits_long(&s->gb, 17) != 1) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
|
|
return -1;
|
|
}
|
|
format = get_bits(&s->gb, 5);
|
|
if (format != 0 && format != 1) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n");
|
|
return -1;
|
|
}
|
|
s->h263_flv = format + 1;
|
|
s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
|
|
format = get_bits(&s->gb, 3);
|
|
switch (format) {
|
|
case 0:
|
|
width = get_bits(&s->gb, 8);
|
|
height = get_bits(&s->gb, 8);
|
|
break;
|
|
case 1:
|
|
width = get_bits(&s->gb, 16);
|
|
height = get_bits(&s->gb, 16);
|
|
break;
|
|
case 2:
|
|
width = 352;
|
|
height = 288;
|
|
break;
|
|
case 3:
|
|
width = 176;
|
|
height = 144;
|
|
break;
|
|
case 4:
|
|
width = 128;
|
|
height = 96;
|
|
break;
|
|
case 5:
|
|
width = 320;
|
|
height = 240;
|
|
break;
|
|
case 6:
|
|
width = 160;
|
|
height = 120;
|
|
break;
|
|
default:
|
|
width = height = 0;
|
|
break;
|
|
}
|
|
if (av_image_check_size(width, height, 0, s->avctx))
|
|
return -1;
|
|
s->width = width;
|
|
s->height = height;
|
|
|
|
s->pict_type = AV_PICTURE_TYPE_I + get_bits(&s->gb, 2);
|
|
s->droppable = s->pict_type > AV_PICTURE_TYPE_P;
|
|
if (s->droppable)
|
|
s->pict_type = AV_PICTURE_TYPE_P;
|
|
|
|
skip_bits1(&s->gb); /* deblocking flag */
|
|
s->chroma_qscale = s->qscale = get_bits(&s->gb, 5);
|
|
|
|
s->h263_plus = 0;
|
|
|
|
s->unrestricted_mv = 1;
|
|
s->h263_long_vectors = 0;
|
|
|
|
/* PEI */
|
|
while (get_bits1(&s->gb) != 0)
|
|
skip_bits(&s->gb, 8);
|
|
s->f_code = 1;
|
|
|
|
if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
|
|
av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n",
|
|
s->droppable ? 'D' : av_get_picture_type_char(s->pict_type),
|
|
s->h263_flv - 1, s->qscale, s->picture_number);
|
|
}
|
|
|
|
s->y_dc_scale_table = s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_flv_decoder = {
|
|
.name = "flv",
|
|
.long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_FLV1,
|
|
.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,
|
|
.pix_fmts = (const enum AVPixelFormat[]) {
|
|
AV_PIX_FMT_YUV420P,
|
|
AV_PIX_FMT_NONE
|
|
},
|
|
};
|