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ffmpeg / libavcodec / flvenc.c @ 72415b2a

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/*
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 * FLV Encoding specific code.
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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 "mpegvideo.h"
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#include "h263.h"
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#include "flv.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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      put_bits(&s->pb, 5, (s->h263_flv-1)); /* 0: h263 escape codes 1: 11-bit escape codes */
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      put_bits(&s->pb, 8, (((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 == FF_P_TYPE); /* 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, int run, int last){
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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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AVCodec flv_encoder = {
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    "flv",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_FLV1,
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    sizeof(MpegEncContext),
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    MPV_encode_init,
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    MPV_encode_picture,
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    MPV_encode_end,
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    .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
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    .long_name= NULL_IF_CONFIG_SMALL("Flash Video (FLV) / Sorenson Spark / Sorenson H.263"),
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};