| 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 "mpegvideo.h" |
| 24 | |
| 25 | void ff_flv_encode_picture_header(MpegEncContext *s, int picture_number) |
| 26 | { |
| 27 | int format; |
| 28 | |
| 29 | avpriv_align_put_bits(&s->pb); |
| 30 | |
| 31 | put_bits(&s->pb, 17, 1); |
| 32 | /* 0: h263 escape codes 1: 11-bit escape codes */ |
| 33 | put_bits(&s->pb, 5, (s->h263_flv - 1)); |
| 34 | put_bits(&s->pb, 8, |
| 35 | (((int64_t) s->picture_number * 30 * s->avctx->time_base.num) / // FIXME use timestamp |
| 36 | s->avctx->time_base.den) & 0xff); /* TemporalReference */ |
| 37 | if (s->width == 352 && s->height == 288) |
| 38 | format = 2; |
| 39 | else if (s->width == 176 && s->height == 144) |
| 40 | format = 3; |
| 41 | else if (s->width == 128 && s->height == 96) |
| 42 | format = 4; |
| 43 | else if (s->width == 320 && s->height == 240) |
| 44 | format = 5; |
| 45 | else if (s->width == 160 && s->height == 120) |
| 46 | format = 6; |
| 47 | else if (s->width <= 255 && s->height <= 255) |
| 48 | format = 0; /* use 1 byte width & height */ |
| 49 | else |
| 50 | format = 1; /* use 2 bytes width & height */ |
| 51 | put_bits(&s->pb, 3, format); /* PictureSize */ |
| 52 | if (format == 0) { |
| 53 | put_bits(&s->pb, 8, s->width); |
| 54 | put_bits(&s->pb, 8, s->height); |
| 55 | } else if (format == 1) { |
| 56 | put_bits(&s->pb, 16, s->width); |
| 57 | put_bits(&s->pb, 16, s->height); |
| 58 | } |
| 59 | put_bits(&s->pb, 2, s->pict_type == AV_PICTURE_TYPE_P); /* PictureType */ |
| 60 | put_bits(&s->pb, 1, 1); /* DeblockingFlag: on */ |
| 61 | put_bits(&s->pb, 5, s->qscale); /* Quantizer */ |
| 62 | put_bits(&s->pb, 1, 0); /* ExtraInformation */ |
| 63 | |
| 64 | if (s->h263_aic) { |
| 65 | s->y_dc_scale_table = |
| 66 | s->c_dc_scale_table = ff_aic_dc_scale_table; |
| 67 | } else { |
| 68 | s->y_dc_scale_table = |
| 69 | s->c_dc_scale_table = ff_mpeg1_dc_scale_table; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | void ff_flv2_encode_ac_esc(PutBitContext *pb, int slevel, int level, |
| 74 | int run, int last) |
| 75 | { |
| 76 | if (level < 64) { // 7-bit level |
| 77 | put_bits(pb, 1, 0); |
| 78 | put_bits(pb, 1, last); |
| 79 | put_bits(pb, 6, run); |
| 80 | |
| 81 | put_sbits(pb, 7, slevel); |
| 82 | } else { |
| 83 | /* 11-bit level */ |
| 84 | put_bits(pb, 1, 1); |
| 85 | put_bits(pb, 1, last); |
| 86 | put_bits(pb, 6, run); |
| 87 | |
| 88 | put_sbits(pb, 11, slevel); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | FF_MPV_GENERIC_CLASS(flv) |
| 93 | |
| 94 | AVCodec ff_flv_encoder = { |
| 95 | .name = "flv", |
| 96 | .long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"), |
| 97 | .type = AVMEDIA_TYPE_VIDEO, |
| 98 | .id = AV_CODEC_ID_FLV1, |
| 99 | .priv_data_size = sizeof(MpegEncContext), |
| 100 | .init = ff_mpv_encode_init, |
| 101 | .encode2 = ff_mpv_encode_picture, |
| 102 | .close = ff_mpv_encode_end, |
| 103 | .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, |
| 104 | AV_PIX_FMT_NONE}, |
| 105 | .priv_class = &flv_class, |
| 106 | }; |