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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  */
20 
21 #include "flv.h"
22 #include "h263.h"
23 #include "mpegvideo.h"
24 #include "mpegvideodata.h"
25 
26 void ff_flv_encode_picture_header(MpegEncContext *s, int picture_number)
27 {
28  int format;
29 
31 
32  put_bits(&s->pb, 17, 1);
33  /* 0: h263 escape codes 1: 11-bit escape codes */
34  put_bits(&s->pb, 5, (s->h263_flv - 1));
35  put_bits(&s->pb, 8,
36  (((int64_t) s->picture_number * 30 * s->avctx->time_base.num) / // FIXME use timestamp
37  s->avctx->time_base.den) & 0xff); /* TemporalReference */
38  if (s->width == 352 && s->height == 288)
39  format = 2;
40  else if (s->width == 176 && s->height == 144)
41  format = 3;
42  else if (s->width == 128 && s->height == 96)
43  format = 4;
44  else if (s->width == 320 && s->height == 240)
45  format = 5;
46  else if (s->width == 160 && s->height == 120)
47  format = 6;
48  else if (s->width <= 255 && s->height <= 255)
49  format = 0; /* use 1 byte width & height */
50  else
51  format = 1; /* use 2 bytes width & height */
52  put_bits(&s->pb, 3, format); /* PictureSize */
53  if (format == 0) {
54  put_bits(&s->pb, 8, s->width);
55  put_bits(&s->pb, 8, s->height);
56  } else if (format == 1) {
57  put_bits(&s->pb, 16, s->width);
58  put_bits(&s->pb, 16, s->height);
59  }
60  put_bits(&s->pb, 2, s->pict_type == AV_PICTURE_TYPE_P); /* PictureType */
61  put_bits(&s->pb, 1, 1); /* DeblockingFlag: on */
62  put_bits(&s->pb, 5, s->qscale); /* Quantizer */
63  put_bits(&s->pb, 1, 0); /* ExtraInformation */
64 
65  if (s->h263_aic) {
66  s->y_dc_scale_table =
68  } else {
69  s->y_dc_scale_table =
71  }
72 }
73 
74 void ff_flv2_encode_ac_esc(PutBitContext *pb, int slevel, int level,
75  int run, int last)
76 {
77  if (level < 64) { // 7-bit level
78  put_bits(pb, 1, 0);
79  put_bits(pb, 1, last);
80  put_bits(pb, 6, run);
81 
82  put_sbits(pb, 7, slevel);
83  } else {
84  /* 11-bit level */
85  put_bits(pb, 1, 1);
86  put_bits(pb, 1, last);
87  put_bits(pb, 6, run);
88 
89  put_sbits(pb, 11, slevel);
90  }
91 }
92 
94 
96  .name = "flv",
97  .long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
98  .type = AVMEDIA_TYPE_VIDEO,
99  .id = AV_CODEC_ID_FLV1,
100  .priv_data_size = sizeof(MpegEncContext),
102  .encode2 = ff_mpv_encode_picture,
103  .close = ff_mpv_encode_end,
104  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
106  .priv_class = &flv_class,
107 };
int picture_number
Definition: mpegvideo.h:196
const char * s
Definition: avisynth_c.h:631
const uint8_t * y_dc_scale_table
qscale -> y_dc_scale table
Definition: mpegvideo.h:257
static void put_sbits(PutBitContext *pb, int n, int32_t value)
Definition: put_bits.h:192
#define FF_MPV_GENERIC_CLASS(name)
Definition: mpegvideo.h:662
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:160
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int num
numerator
Definition: rational.h:44
void avpriv_align_put_bits(PutBitContext *s)
Pad the bitstream with zeros up to the next byte boundary.
Definition: bitstream.c:48
mpegvideo header.
uint8_t run
Definition: svq3.c:149
AVCodec.
Definition: avcodec.h:3181
int qscale
QP.
Definition: mpegvideo.h:273
int h263_aic
Advanded INTRA Coding (AIC)
Definition: mpegvideo.h:156
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1369
const uint8_t ff_mpeg1_dc_scale_table[128]
Definition: mpegvideodata.c:27
void ff_flv2_encode_ac_esc(PutBitContext *pb, int slevel, int level, int run, int last)
Definition: flvenc.c:74
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
const char * name
Name of the codec implementation.
Definition: avcodec.h:3188
const uint8_t ff_aic_dc_scale_table[32]
Definition: h263data.h:248
static const AVClass flv_class
Definition: flvdec.c:1091
int h263_flv
use flv h263 header
Definition: mpegvideo.h:179
void ff_flv_encode_picture_header(MpegEncContext *s, int picture_number)
Definition: flvenc.c:26
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:169
int ff_mpv_encode_init(AVCodecContext *avctx)
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:281
const uint8_t * c_dc_scale_table
qscale -> c_dc_scale table
Definition: mpegvideo.h:258
uint8_t level
Definition: svq3.c:150
MpegEncContext.
Definition: mpegvideo.h:150
struct AVCodecContext * avctx
Definition: mpegvideo.h:167
PutBitContext pb
bit output
Definition: mpegvideo.h:220
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:63
int den
denominator
Definition: rational.h:45
int ff_mpv_encode_end(AVCodecContext *avctx)
int ff_mpv_encode_picture(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)
AVPixelFormat
Pixel format.
Definition: pixfmt.h:61
AVCodec ff_flv_encoder
Definition: flvenc.c:95
Predicted.
Definition: avutil.h:268