mirror of https://git.ffmpeg.org/ffmpeg.git
115 lines
3.8 KiB
C
115 lines
3.8 KiB
C
/*
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* FLV Encoding specific code.
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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 "flv.h"
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#include "h263.h"
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#include "h263data.h"
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#include "mpegvideo.h"
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#include "mpegvideodata.h"
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void ff_flv_encode_picture_header(MpegEncContext *s, int picture_number)
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{
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int format;
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align_put_bits(&s->pb);
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put_bits(&s->pb, 17, 1);
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/* 0: H.263 escape codes 1: 11-bit escape codes */
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put_bits(&s->pb, 5, (s->h263_flv - 1));
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put_bits(&s->pb, 8,
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(((int64_t) s->picture_number * 30 * s->avctx->time_base.num) / // FIXME use timestamp
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s->avctx->time_base.den) & 0xff); /* TemporalReference */
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if (s->width == 352 && s->height == 288)
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format = 2;
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else if (s->width == 176 && s->height == 144)
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format = 3;
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else if (s->width == 128 && s->height == 96)
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format = 4;
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else if (s->width == 320 && s->height == 240)
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format = 5;
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else if (s->width == 160 && s->height == 120)
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format = 6;
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else if (s->width <= 255 && s->height <= 255)
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format = 0; /* use 1 byte width & height */
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else
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format = 1; /* use 2 bytes width & height */
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put_bits(&s->pb, 3, format); /* PictureSize */
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if (format == 0) {
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put_bits(&s->pb, 8, s->width);
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put_bits(&s->pb, 8, s->height);
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} else if (format == 1) {
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put_bits(&s->pb, 16, s->width);
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put_bits(&s->pb, 16, s->height);
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}
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put_bits(&s->pb, 2, s->pict_type == AV_PICTURE_TYPE_P); /* PictureType */
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put_bits(&s->pb, 1, 1); /* DeblockingFlag: on */
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put_bits(&s->pb, 5, s->qscale); /* Quantizer */
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put_bits(&s->pb, 1, 0); /* ExtraInformation */
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if (s->h263_aic) {
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s->y_dc_scale_table =
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s->c_dc_scale_table = ff_aic_dc_scale_table;
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} else {
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s->y_dc_scale_table =
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s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
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}
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}
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void ff_flv2_encode_ac_esc(PutBitContext *pb, int slevel, int level,
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int run, int last)
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{
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if (level < 64) { // 7-bit level
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put_bits(pb, 1, 0);
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put_bits(pb, 1, last);
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put_bits(pb, 6, run);
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put_sbits(pb, 7, slevel);
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} else {
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/* 11-bit level */
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put_bits(pb, 1, 1);
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put_bits(pb, 1, last);
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put_bits(pb, 6, run);
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put_sbits(pb, 11, slevel);
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}
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}
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static const AVClass flv_class = {
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.class_name = "flv encoder",
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.item_name = av_default_item_name,
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.option = ff_mpv_generic_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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const AVCodec ff_flv_encoder = {
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.name = "flv",
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.long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_FLV1,
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.priv_data_size = sizeof(MpegEncContext),
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.init = ff_mpv_encode_init,
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.encode2 = ff_mpv_encode_picture,
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.close = ff_mpv_encode_end,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
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.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_NONE},
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.priv_class = &flv_class,
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};
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