FFmpeg: libavcodec/flvenc.c Source File

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libavcodec

flvenc.c

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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 */

21 #include "flv.h"

22 #include "h263.h"

23 #include "mpegvideo.h"

25 void ff_flv_encode_picture_header(MpegEncContext *s, int picture_number)

26 {

27 int format;

29 avpriv_align_put_bits(&s->pb);

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 */

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 }

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);

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);

88 put_sbits(pb, 11, slevel);

89 }

90 }

92 FF_MPV_GENERIC_CLASS(flv)

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 };

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