mirror of https://git.ffmpeg.org/ffmpeg.git
114 lines
3.7 KiB
C
114 lines
3.7 KiB
C
/*
|
|
* FLV Encoding specific code.
|
|
*
|
|
* 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 "flv.h"
|
|
#include "h263.h"
|
|
#include "h263data.h"
|
|
#include "mpegvideo.h"
|
|
#include "mpegvideodata.h"
|
|
|
|
void ff_flv_encode_picture_header(MpegEncContext *s, int picture_number)
|
|
{
|
|
int format;
|
|
|
|
avpriv_align_put_bits(&s->pb);
|
|
|
|
put_bits(&s->pb, 17, 1);
|
|
/* 0: h263 escape codes 1: 11-bit escape codes */
|
|
put_bits(&s->pb, 5, (s->h263_flv - 1));
|
|
put_bits(&s->pb, 8,
|
|
(((int64_t) s->picture_number * 30 * s->avctx->time_base.num) / // FIXME use timestamp
|
|
s->avctx->time_base.den) & 0xff); /* TemporalReference */
|
|
if (s->width == 352 && s->height == 288)
|
|
format = 2;
|
|
else if (s->width == 176 && s->height == 144)
|
|
format = 3;
|
|
else if (s->width == 128 && s->height == 96)
|
|
format = 4;
|
|
else if (s->width == 320 && s->height == 240)
|
|
format = 5;
|
|
else if (s->width == 160 && s->height == 120)
|
|
format = 6;
|
|
else if (s->width <= 255 && s->height <= 255)
|
|
format = 0; /* use 1 byte width & height */
|
|
else
|
|
format = 1; /* use 2 bytes width & height */
|
|
put_bits(&s->pb, 3, format); /* PictureSize */
|
|
if (format == 0) {
|
|
put_bits(&s->pb, 8, s->width);
|
|
put_bits(&s->pb, 8, s->height);
|
|
} else if (format == 1) {
|
|
put_bits(&s->pb, 16, s->width);
|
|
put_bits(&s->pb, 16, s->height);
|
|
}
|
|
put_bits(&s->pb, 2, s->pict_type == AV_PICTURE_TYPE_P); /* PictureType */
|
|
put_bits(&s->pb, 1, 1); /* DeblockingFlag: on */
|
|
put_bits(&s->pb, 5, s->qscale); /* Quantizer */
|
|
put_bits(&s->pb, 1, 0); /* ExtraInformation */
|
|
|
|
if (s->h263_aic) {
|
|
s->y_dc_scale_table =
|
|
s->c_dc_scale_table = ff_aic_dc_scale_table;
|
|
} else {
|
|
s->y_dc_scale_table =
|
|
s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
|
|
}
|
|
}
|
|
|
|
void ff_flv2_encode_ac_esc(PutBitContext *pb, int slevel, int level,
|
|
int run, int last)
|
|
{
|
|
if (level < 64) { // 7-bit level
|
|
put_bits(pb, 1, 0);
|
|
put_bits(pb, 1, last);
|
|
put_bits(pb, 6, run);
|
|
|
|
put_sbits(pb, 7, slevel);
|
|
} else {
|
|
/* 11-bit level */
|
|
put_bits(pb, 1, 1);
|
|
put_bits(pb, 1, last);
|
|
put_bits(pb, 6, run);
|
|
|
|
put_sbits(pb, 11, slevel);
|
|
}
|
|
}
|
|
|
|
static const AVClass flv_class = {
|
|
.class_name = "flv encoder",
|
|
.item_name = av_default_item_name,
|
|
.option = ff_mpv_generic_options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
AVCodec ff_flv_encoder = {
|
|
.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_mpv_encode_init,
|
|
.encode2 = ff_mpv_encode_picture,
|
|
.close = ff_mpv_encode_end,
|
|
.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
|
|
AV_PIX_FMT_NONE},
|
|
.priv_class = &flv_class,
|
|
};
|