Libav
|
00001 /* 00002 * FLV Encoding specific code. 00003 * This file is part of FFmpeg. 00004 * 00005 * FFmpeg is free software; you can redistribute it and/or 00006 * modify it under the terms of the GNU Lesser General Public 00007 * License as published by the Free Software Foundation; either 00008 * version 2.1 of the License, or (at your option) any later version. 00009 * 00010 * FFmpeg is distributed in the hope that it will be useful, 00011 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00013 * Lesser General Public License for more details. 00014 * 00015 * You should have received a copy of the GNU Lesser General Public 00016 * License along with FFmpeg; if not, write to the Free Software 00017 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00018 */ 00019 00020 #include "mpegvideo.h" 00021 #include "h263.h" 00022 #include "flv.h" 00023 00024 void ff_flv_encode_picture_header(MpegEncContext * s, int picture_number) 00025 { 00026 int format; 00027 00028 align_put_bits(&s->pb); 00029 00030 put_bits(&s->pb, 17, 1); 00031 put_bits(&s->pb, 5, (s->h263_flv-1)); /* 0: h263 escape codes 1: 11-bit escape codes */ 00032 put_bits(&s->pb, 8, (((int64_t)s->picture_number * 30 * s->avctx->time_base.num) / //FIXME use timestamp 00033 s->avctx->time_base.den) & 0xff); /* TemporalReference */ 00034 if (s->width == 352 && s->height == 288) 00035 format = 2; 00036 else if (s->width == 176 && s->height == 144) 00037 format = 3; 00038 else if (s->width == 128 && s->height == 96) 00039 format = 4; 00040 else if (s->width == 320 && s->height == 240) 00041 format = 5; 00042 else if (s->width == 160 && s->height == 120) 00043 format = 6; 00044 else if (s->width <= 255 && s->height <= 255) 00045 format = 0; /* use 1 byte width & height */ 00046 else 00047 format = 1; /* use 2 bytes width & height */ 00048 put_bits(&s->pb, 3, format); /* PictureSize */ 00049 if (format == 0) { 00050 put_bits(&s->pb, 8, s->width); 00051 put_bits(&s->pb, 8, s->height); 00052 } else if (format == 1) { 00053 put_bits(&s->pb, 16, s->width); 00054 put_bits(&s->pb, 16, s->height); 00055 } 00056 put_bits(&s->pb, 2, s->pict_type == FF_P_TYPE); /* PictureType */ 00057 put_bits(&s->pb, 1, 1); /* DeblockingFlag: on */ 00058 put_bits(&s->pb, 5, s->qscale); /* Quantizer */ 00059 put_bits(&s->pb, 1, 0); /* ExtraInformation */ 00060 00061 if(s->h263_aic){ 00062 s->y_dc_scale_table= 00063 s->c_dc_scale_table= ff_aic_dc_scale_table; 00064 }else{ 00065 s->y_dc_scale_table= 00066 s->c_dc_scale_table= ff_mpeg1_dc_scale_table; 00067 } 00068 } 00069 00070 void ff_flv2_encode_ac_esc(PutBitContext *pb, int slevel, int level, int run, int last){ 00071 if(level < 64) { // 7-bit level 00072 put_bits(pb, 1, 0); 00073 put_bits(pb, 1, last); 00074 put_bits(pb, 6, run); 00075 00076 put_sbits(pb, 7, slevel); 00077 } else { 00078 /* 11-bit level */ 00079 put_bits(pb, 1, 1); 00080 put_bits(pb, 1, last); 00081 put_bits(pb, 6, run); 00082 00083 put_sbits(pb, 11, slevel); 00084 } 00085 } 00086 00087 AVCodec flv_encoder = { 00088 "flv", 00089 AVMEDIA_TYPE_VIDEO, 00090 CODEC_ID_FLV1, 00091 sizeof(MpegEncContext), 00092 MPV_encode_init, 00093 MPV_encode_picture, 00094 MPV_encode_end, 00095 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE}, 00096 .long_name= NULL_IF_CONFIG_SMALL("Flash Video (FLV) / Sorenson Spark / Sorenson H.263"), 00097 };