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/* |
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* FLV Encoding specific code. |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "flv.h" |
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#include "h263.h" |
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#include "h263data.h" |
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#include "mpegvideo.h" |
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#include "mpegvideodata.h" |
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void ff_flv_encode_picture_header(MpegEncContext *s, int picture_number) |
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{ |
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int format; |
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align_put_bits(&s->pb); |
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put_bits(&s->pb, 17, 1); |
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/* 0: H.263 escape codes 1: 11-bit escape codes */ |
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put_bits(&s->pb, 5, (s->h263_flv - 1)); |
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put_bits(&s->pb, 8, |
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(((int64_t) s->picture_number * 30 * s->avctx->time_base.num) / // FIXME use timestamp |
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s->avctx->time_base.den) & 0xff); /* TemporalReference */ |
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✓✓✓✗
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if (s->width == 352 && s->height == 288) |
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format = 2; |
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✗✓✗✗
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else if (s->width == 176 && s->height == 144) |
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format = 3; |
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✗✓✗✗
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else if (s->width == 128 && s->height == 96) |
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format = 4; |
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✓✓✓✗
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else if (s->width == 320 && s->height == 240) |
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format = 5; |
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✗✓✗✗
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else if (s->width == 160 && s->height == 120) |
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format = 6; |
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✓✗✓✗
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else if (s->width <= 255 && s->height <= 255) |
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format = 0; /* use 1 byte width & height */ |
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else |
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format = 1; /* use 2 bytes width & height */ |
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put_bits(&s->pb, 3, format); /* PictureSize */ |
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✓✓ |
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if (format == 0) { |
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put_bits(&s->pb, 8, s->width); |
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put_bits(&s->pb, 8, s->height); |
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✗✓ |
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} else if (format == 1) { |
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put_bits(&s->pb, 16, s->width); |
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put_bits(&s->pb, 16, s->height); |
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} |
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put_bits(&s->pb, 2, s->pict_type == AV_PICTURE_TYPE_P); /* PictureType */ |
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put_bits(&s->pb, 1, 1); /* DeblockingFlag: on */ |
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put_bits(&s->pb, 5, s->qscale); /* Quantizer */ |
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put_bits(&s->pb, 1, 0); /* ExtraInformation */ |
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✗✓ |
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if (s->h263_aic) { |
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s->y_dc_scale_table = |
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s->c_dc_scale_table = ff_aic_dc_scale_table; |
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} else { |
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s->y_dc_scale_table = |
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s->c_dc_scale_table = ff_mpeg1_dc_scale_table; |
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} |
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} |
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void ff_flv2_encode_ac_esc(PutBitContext *pb, int slevel, int level, |
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int run, int last) |
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{ |
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✓✓ |
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if (level < 64) { // 7-bit level |
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put_bits(pb, 1, 0); |
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put_bits(pb, 1, last); |
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put_bits(pb, 6, run); |
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put_sbits(pb, 7, slevel); |
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} else { |
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/* 11-bit level */ |
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put_bits(pb, 1, 1); |
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put_bits(pb, 1, last); |
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put_bits(pb, 6, run); |
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put_sbits(pb, 11, slevel); |
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} |
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} |
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static const AVClass flv_class = { |
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.class_name = "flv encoder", |
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.item_name = av_default_item_name, |
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.option = ff_mpv_generic_options, |
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.version = LIBAVUTIL_VERSION_INT, |
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}; |
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AVCodec ff_flv_encoder = { |
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.name = "flv", |
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.long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_FLV1, |
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.priv_data_size = sizeof(MpegEncContext), |
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.init = ff_mpv_encode_init, |
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.encode2 = ff_mpv_encode_picture, |
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.close = ff_mpv_encode_end, |
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.caps_internal = FF_CODEC_CAP_INIT_CLEANUP, |
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.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, |
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AV_PIX_FMT_NONE}, |
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.priv_class = &flv_class, |
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}; |