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  1. /*
  2.  * FLV Encoding specific code.
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include "flv.h"
  22. #include "h263.h"
  23. #include "h263data.h"
  24. #include "mpegvideo.h"
  25. #include "mpegvideodata.h"
  26.  
  27. void ff_flv_encode_picture_header(MpegEncContext *s, int picture_number)
  28. {
  29.     int format;
  30.  
  31.     avpriv_align_put_bits(&s->pb);
  32.  
  33.     put_bits(&s->pb, 17, 1);
  34.     /* 0: h263 escape codes 1: 11-bit escape codes */
  35.     put_bits(&s->pb, 5, (s->h263_flv - 1));
  36.     put_bits(&s->pb, 8,
  37.              (((int64_t) s->picture_number * 30 * s->avctx->time_base.num) /   // FIXME use timestamp
  38.               s->avctx->time_base.den) & 0xff);   /* TemporalReference */
  39.     if (s->width == 352 && s->height == 288)
  40.         format = 2;
  41.     else if (s->width == 176 && s->height == 144)
  42.         format = 3;
  43.     else if (s->width == 128 && s->height == 96)
  44.         format = 4;
  45.     else if (s->width == 320 && s->height == 240)
  46.         format = 5;
  47.     else if (s->width == 160 && s->height == 120)
  48.         format = 6;
  49.     else if (s->width <= 255 && s->height <= 255)
  50.         format = 0;   /* use 1 byte width & height */
  51.     else
  52.         format = 1;   /* use 2 bytes width & height */
  53.     put_bits(&s->pb, 3, format);   /* PictureSize */
  54.     if (format == 0) {
  55.         put_bits(&s->pb, 8, s->width);
  56.         put_bits(&s->pb, 8, s->height);
  57.     } else if (format == 1) {
  58.         put_bits(&s->pb, 16, s->width);
  59.         put_bits(&s->pb, 16, s->height);
  60.     }
  61.     put_bits(&s->pb, 2, s->pict_type == AV_PICTURE_TYPE_P);   /* PictureType */
  62.     put_bits(&s->pb, 1, 1);   /* DeblockingFlag: on */
  63.     put_bits(&s->pb, 5, s->qscale);   /* Quantizer */
  64.     put_bits(&s->pb, 1, 0);   /* ExtraInformation */
  65.  
  66.     if (s->h263_aic) {
  67.         s->y_dc_scale_table =
  68.         s->c_dc_scale_table = ff_aic_dc_scale_table;
  69.     } else {
  70.         s->y_dc_scale_table =
  71.         s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
  72.     }
  73. }
  74.  
  75. void ff_flv2_encode_ac_esc(PutBitContext *pb, int slevel, int level,
  76.                            int run, int last)
  77. {
  78.     if (level < 64) { // 7-bit level
  79.         put_bits(pb, 1, 0);
  80.         put_bits(pb, 1, last);
  81.         put_bits(pb, 6, run);
  82.  
  83.         put_sbits(pb, 7, slevel);
  84.     } else {
  85.         /* 11-bit level */
  86.         put_bits(pb, 1, 1);
  87.         put_bits(pb, 1, last);
  88.         put_bits(pb, 6, run);
  89.  
  90.         put_sbits(pb, 11, slevel);
  91.     }
  92. }
  93.  
  94. static const AVClass flv_class = {
  95.     .class_name = "flv encoder",
  96.     .item_name  = av_default_item_name,
  97.     .option     = ff_mpv_generic_options,
  98.     .version    = LIBAVUTIL_VERSION_INT,
  99. };
  100.  
  101. AVCodec ff_flv_encoder = {
  102.     .name           = "flv",
  103.     .long_name      = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
  104.     .type           = AVMEDIA_TYPE_VIDEO,
  105.     .id             = AV_CODEC_ID_FLV1,
  106.     .priv_data_size = sizeof(MpegEncContext),
  107.     .init           = ff_mpv_encode_init,
  108.     .encode2        = ff_mpv_encode_picture,
  109.     .close          = ff_mpv_encode_end,
  110.     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
  111.                                                      AV_PIX_FMT_NONE},
  112.     .priv_class     = &flv_class,
  113. };
  114.