aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* FLV Encoding specific code.
*
* 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 "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: H.263 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,
};
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