1/* 2 * FLV Encoding specific code. 3 * This file is part of FFmpeg. 4 * 5 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 24void ff_flv_encode_picture_header(MpegEncContext * s, int picture_number) 25{ 26 int format; 27 28 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 == FF_P_TYPE); /* 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 70void 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 87AVCodec flv_encoder = { 88 "flv", 89 AVMEDIA_TYPE_VIDEO, 90 CODEC_ID_FLV1, 91 sizeof(MpegEncContext), 92 MPV_encode_init, 93 MPV_encode_picture, 94 MPV_encode_end, 95 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE}, 96 .long_name= NULL_IF_CONFIG_SMALL("Flash Video (FLV) / Sorenson Spark / Sorenson H.263"), 97}; 98