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 "codec_internal.h" 22#include "flvenc.h" 23#include "h263data.h" 24#include "mpegvideo.h" 25#include "mpegvideodata.h" 26#include "mpegvideoenc.h" 27 28void ff_flv_encode_picture_header(MpegEncContext *s, int picture_number) 29{ 30 int format; 31 32 align_put_bits(&s->pb); 33 34 put_bits(&s->pb, 17, 1); 35 /* 0: H.263 escape codes 1: 11-bit escape codes */ 36 put_bits(&s->pb, 5, (s->h263_flv - 1)); 37 put_bits(&s->pb, 8, 38 (((int64_t) s->picture_number * 30 * s->avctx->time_base.num) / // FIXME use timestamp 39 s->avctx->time_base.den) & 0xff); /* TemporalReference */ 40 if (s->width == 352 && s->height == 288) 41 format = 2; 42 else if (s->width == 176 && s->height == 144) 43 format = 3; 44 else if (s->width == 128 && s->height == 96) 45 format = 4; 46 else if (s->width == 320 && s->height == 240) 47 format = 5; 48 else if (s->width == 160 && s->height == 120) 49 format = 6; 50 else if (s->width <= 255 && s->height <= 255) 51 format = 0; /* use 1 byte width & height */ 52 else 53 format = 1; /* use 2 bytes width & height */ 54 put_bits(&s->pb, 3, format); /* PictureSize */ 55 if (format == 0) { 56 put_bits(&s->pb, 8, s->width); 57 put_bits(&s->pb, 8, s->height); 58 } else if (format == 1) { 59 put_bits(&s->pb, 16, s->width); 60 put_bits(&s->pb, 16, s->height); 61 } 62 put_bits(&s->pb, 2, s->pict_type == AV_PICTURE_TYPE_P); /* PictureType */ 63 put_bits(&s->pb, 1, 1); /* DeblockingFlag: on */ 64 put_bits(&s->pb, 5, s->qscale); /* Quantizer */ 65 put_bits(&s->pb, 1, 0); /* ExtraInformation */ 66 67 if (s->h263_aic) { 68 s->y_dc_scale_table = 69 s->c_dc_scale_table = ff_aic_dc_scale_table; 70 } else { 71 s->y_dc_scale_table = 72 s->c_dc_scale_table = ff_mpeg1_dc_scale_table; 73 } 74} 75 76void ff_flv2_encode_ac_esc(PutBitContext *pb, int slevel, int level, 77 int run, int last) 78{ 79 if (level < 64) { // 7-bit level 80 put_bits(pb, 1, 0); 81 put_bits(pb, 1, last); 82 put_bits(pb, 6, run); 83 84 put_sbits(pb, 7, slevel); 85 } else { 86 /* 11-bit level */ 87 put_bits(pb, 1, 1); 88 put_bits(pb, 1, last); 89 put_bits(pb, 6, run); 90 91 put_sbits(pb, 11, slevel); 92 } 93} 94 95const FFCodec ff_flv_encoder = { 96 .p.name = "flv", 97 .p.long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"), 98 .p.type = AVMEDIA_TYPE_VIDEO, 99 .p.id = AV_CODEC_ID_FLV1, 100 .p.priv_class = &ff_mpv_enc_class, 101 .priv_data_size = sizeof(MpegEncContext), 102 .init = ff_mpv_encode_init, 103 FF_CODEC_ENCODE_CB(ff_mpv_encode_picture), 104 .close = ff_mpv_encode_end, 105 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, 106 .p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, 107 AV_PIX_FMT_NONE}, 108}; 109