libavcodec/flvenc.c

   1 /*
   2  * FLV Encoding specific code.
   3  * This file is part of Libav.
   4  *
   5  * Libav is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * Libav is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with Libav; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 #include "mpegvideo.h"
  21 #include "h263.h"
  22 #include "flv.h"
  23
  24 void ff_flv_encode_picture_header(MpegEncContext * s, int picture_number)
  25 {
  26       int format;
  27
  28       avpriv_align_put_bits(&s->pb);
  29
  30       put_bits(&s->pb, 17, 1);
  31       put_bits(&s->pb, 5, (s->h263_flv-1)); /* 0: h263 escape codes 1: 11-bit escape codes */
  32       put_bits(&s->pb, 8, (((int64_t)s->picture_number * 30 * s->avctx->time_base.num) / //FIXME use timestamp
  33                            s->avctx->time_base.den) & 0xff); /* TemporalReference */
  34       if (s->width == 352 && s->height == 288)
  35         format = 2;
  36       else if (s->width == 176 && s->height == 144)
  37         format = 3;
  38       else if (s->width == 128 && s->height == 96)
  39         format = 4;
  40       else if (s->width == 320 && s->height == 240)
  41         format = 5;
  42       else if (s->width == 160 && s->height == 120)
  43         format = 6;
  44       else if (s->width <= 255 && s->height <= 255)
  45         format = 0; /* use 1 byte width & height */
  46       else
  47         format = 1; /* use 2 bytes width & height */
  48       put_bits(&s->pb, 3, format); /* PictureSize */
  49       if (format == 0) {
  50         put_bits(&s->pb, 8, s->width);
  51         put_bits(&s->pb, 8, s->height);
  52       } else if (format == 1) {
  53         put_bits(&s->pb, 16, s->width);
  54         put_bits(&s->pb, 16, s->height);
  55       }
  56       put_bits(&s->pb, 2, s->pict_type == AV_PICTURE_TYPE_P); /* PictureType */
  57       put_bits(&s->pb, 1, 1); /* DeblockingFlag: on */
  58       put_bits(&s->pb, 5, s->qscale); /* Quantizer */
  59       put_bits(&s->pb, 1, 0); /* ExtraInformation */
  60
  61       if(s->h263_aic){
  62         s->y_dc_scale_table=
  63           s->c_dc_scale_table= ff_aic_dc_scale_table;
  64       }else{
  65         s->y_dc_scale_table=
  66           s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
  67       }
  68 }
  69
  70 void ff_flv2_encode_ac_esc(PutBitContext *pb, int slevel, int level, int run, int last){
  71     if(level < 64) { // 7-bit level
  72         put_bits(pb, 1, 0);
  73         put_bits(pb, 1, last);
  74         put_bits(pb, 6, run);
  75
  76         put_sbits(pb, 7, slevel);
  77     } else {
  78         /* 11-bit level */
  79         put_bits(pb, 1, 1);
  80         put_bits(pb, 1, last);
  81         put_bits(pb, 6, run);
  82
  83         put_sbits(pb, 11, slevel);
  84     }
  85 }
  86
  87 FF_MPV_GENERIC_CLASS(flv)
  88
  89 AVCodec ff_flv_encoder = {
  90     .name           = "flv",
  91     .type           = AVMEDIA_TYPE_VIDEO,
  92     .id             = AV_CODEC_ID_FLV1,
  93     .priv_data_size = sizeof(MpegEncContext),
  94     .init           = ff_MPV_encode_init,
  95     .encode2        = ff_MPV_encode_picture,
  96     .close          = ff_MPV_encode_end,
  97     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
  98     .long_name      = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
  99     .priv_class     = &flv_class,
 100 };