FFmpeg: libavcodec/flvenc.c Source File

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libavcodec

flvenc.c

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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 */

20 #include "mpegvideo.h"

21 #include "h263.h"

22 #include "flv.h"

24 void ff_flv_encode_picture_header(MpegEncContext * s, int picture_number)

25 {

26 int format;

28 avpriv_align_put_bits(&s->pb);

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 == AV_PICTURE_TYPE_P); /* 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 */

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 }

70 void 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);

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);

83 put_sbits(pb, 11, slevel);

84 }

85 }

87 FF_MPV_GENERIC_CLASS(flv)

89 AVCodec ff_flv_encoder = {

90 .name = "flv",

91 .type = AVMEDIA_TYPE_VIDEO,

92 .id = AV_CODEC_ID_FLV1,

93 .priv_data_size = sizeof(MpegEncContext),

94 .init = ff_MPV_encode_init,

95 .encode2 = ff_MPV_encode_picture,

96 .close = ff_MPV_encode_end,

97 .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },

98 .long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),

99 .priv_class = &flv_class,

100 };

Generated on Wed Jul 10 2013 23:47:58 for FFmpeg by doxygen 1.8.2