FFmpeg
wmv2enc.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2002 The FFmpeg Project
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 "libavutil/mem.h"
22 #include "avcodec.h"
23 #include "codec_internal.h"
24 #include "h263.h"
25 #include "mpegvideo.h"
26 #include "mpegvideoenc.h"
27 #include "msmpeg4.h"
28 #include "msmpeg4enc.h"
29 #include "msmpeg4data.h"
30 #include "msmpeg4_vc1_data.h"
31 #include "wmv2.h"
32 #include "wmv2enc.h"
33 
34 #define WMV2_EXTRADATA_SIZE 4
35 
36 typedef struct WMV2EncContext {
37  MSMPEG4EncContext msmpeg4;
38  WMV2Context common;
39  int j_type_bit;
40  int j_type;
41  int abt_flag;
42  int abt_type;
43  int per_mb_abt;
44  int mspel_bit;
45  int cbp_table_index;
46  int top_left_mv_flag;
47  int per_mb_rl_bit;
48 } WMV2EncContext;
49 
50 static int encode_ext_header(WMV2EncContext *w)
51 {
52  MpegEncContext *const s = &w->msmpeg4.s;
53  PutBitContext pb;
54  int code;
55 
56  init_put_bits(&pb, s->avctx->extradata, WMV2_EXTRADATA_SIZE);
57 
58  put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); // yes 29.97 -> 29
59  put_bits(&pb, 11, FFMIN(s->bit_rate / 1024, 2047));
60 
61  put_bits(&pb, 1, w->mspel_bit = 1);
62  put_bits(&pb, 1, s->loop_filter);
63  put_bits(&pb, 1, w->abt_flag = 1);
64  put_bits(&pb, 1, w->j_type_bit = 1);
65  put_bits(&pb, 1, w->top_left_mv_flag = 0);
66  put_bits(&pb, 1, w->per_mb_rl_bit = 1);
67  put_bits(&pb, 3, code = 1);
68 
69  flush_put_bits(&pb);
70 
71  s->slice_height = s->mb_height / code;
72 
73  return 0;
74 }
75 
76 static av_cold int wmv2_encode_init(AVCodecContext *avctx)
77 {
78  WMV2EncContext *const w = avctx->priv_data;
79  MpegEncContext *const s = &w->msmpeg4.s;
80 
81  s->private_ctx = &w->common;
82  if (ff_mpv_encode_init(avctx) < 0)
83  return -1;
84 
85  ff_wmv2_common_init(s);
86 
87  avctx->extradata_size = WMV2_EXTRADATA_SIZE;
88  avctx->extradata = av_mallocz(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
89  if (!avctx->extradata)
90  return AVERROR(ENOMEM);
91 
92  encode_ext_header(w);
93 
94  return 0;
95 }
96 
97 int ff_wmv2_encode_picture_header(MpegEncContext *s)
98 {
99  WMV2EncContext *const w = (WMV2EncContext *) s;
100 
101  put_bits(&s->pb, 1, s->pict_type - 1);
102  if (s->pict_type == AV_PICTURE_TYPE_I)
103  put_bits(&s->pb, 7, 0);
104  put_bits(&s->pb, 5, s->qscale);
105 
106  s->dc_table_index = 1;
107  s->mv_table_index = 1; /* only if P-frame */
108  s->per_mb_rl_table = 0;
109  s->mspel = 0;
110  w->per_mb_abt = 0;
111  w->abt_type = 0;
112  w->j_type = 0;
113 
114  av_assert0(s->flipflop_rounding);
115 
116  if (s->pict_type == AV_PICTURE_TYPE_I) {
117  av_assert0(s->no_rounding == 1);
118  if (w->j_type_bit)
119  put_bits(&s->pb, 1, w->j_type);
120 
121  if (w->per_mb_rl_bit)
122  put_bits(&s->pb, 1, s->per_mb_rl_table);
123 
124  if (!s->per_mb_rl_table) {
125  ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
126  ff_msmpeg4_code012(&s->pb, s->rl_table_index);
127  }
128 
129  put_bits(&s->pb, 1, s->dc_table_index);
130 
131  s->inter_intra_pred = 0;
132  } else {
133  int cbp_index;
134 
135  put_bits(&s->pb, 2, SKIP_TYPE_NONE);
136 
137  ff_msmpeg4_code012(&s->pb, cbp_index = 0);
138  w->cbp_table_index = wmv2_get_cbp_table_index(s, cbp_index);
139 
140  if (w->mspel_bit)
141  put_bits(&s->pb, 1, s->mspel);
142 
143  if (w->abt_flag) {
144  put_bits(&s->pb, 1, w->per_mb_abt ^ 1);
145  if (!w->per_mb_abt)
146  ff_msmpeg4_code012(&s->pb, w->abt_type);
147  }
148 
149  if (w->per_mb_rl_bit)
150  put_bits(&s->pb, 1, s->per_mb_rl_table);
151 
152  if (!s->per_mb_rl_table) {
153  ff_msmpeg4_code012(&s->pb, s->rl_table_index);
154  s->rl_chroma_table_index = s->rl_table_index;
155  }
156  put_bits(&s->pb, 1, s->dc_table_index);
157  put_bits(&s->pb, 1, s->mv_table_index);
158 
159  s->inter_intra_pred = 0; // (s->width * s->height < 320 * 240 && s->bit_rate <= II_BITRATE);
160  }
161  s->esc3_level_length = 0;
162  s->esc3_run_length = 0;
163 
164  return 0;
165 }
166 
167 /* Nearly identical to wmv1 but that is just because we do not use the
168  * useless M$ crap features. It is duplicated here in case someone wants
169  * to add support for these crap features. */
170 void ff_wmv2_encode_mb(MpegEncContext *s, int16_t block[6][64],
171  int motion_x, int motion_y)
172 {
173  WMV2EncContext *const w = (WMV2EncContext *) s;
174  int cbp, coded_cbp, i;
175  int pred_x, pred_y;
176  uint8_t *coded_block;
177 
178  ff_msmpeg4_handle_slices(s);
179 
180  if (!s->mb_intra) {
181  /* compute cbp */
182  cbp = 0;
183  for (i = 0; i < 6; i++)
184  if (s->block_last_index[i] >= 0)
185  cbp |= 1 << (5 - i);
186 
187  put_bits(&s->pb,
188  ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
189  ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
190 
191  s->misc_bits += get_bits_diff(s);
192  /* motion vector */
193  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
194  ff_msmpeg4_encode_motion(s, motion_x - pred_x,
195  motion_y - pred_y);
196  s->mv_bits += get_bits_diff(s);
197  } else {
198  /* compute cbp */
199  cbp = 0;
200  coded_cbp = 0;
201  for (i = 0; i < 6; i++) {
202  int val, pred;
203  val = (s->block_last_index[i] >= 1);
204  cbp |= val << (5 - i);
205  if (i < 4) {
206  /* predict value for close blocks only for luma */
207  pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
208  *coded_block = val;
209  val = val ^ pred;
210  }
211  coded_cbp |= val << (5 - i);
212  }
213 
214  if (s->pict_type == AV_PICTURE_TYPE_I)
215  put_bits(&s->pb,
216  ff_msmp4_mb_i_table[coded_cbp][1],
217  ff_msmp4_mb_i_table[coded_cbp][0]);
218  else
219  put_bits(&s->pb,
220  ff_wmv2_inter_table[w->cbp_table_index][cbp][1],
221  ff_wmv2_inter_table[w->cbp_table_index][cbp][0]);
222  put_bits(&s->pb, 1, 0); /* no AC prediction yet */
223  if (s->inter_intra_pred) {
224  s->h263_aic_dir = 0;
225  put_bits(&s->pb,
226  ff_table_inter_intra[s->h263_aic_dir][1],
227  ff_table_inter_intra[s->h263_aic_dir][0]);
228  }
229  s->misc_bits += get_bits_diff(s);
230  }
231 
232  for (i = 0; i < 6; i++)
233  ff_msmpeg4_encode_block(s, block[i], i);
234  if (s->mb_intra)
235  s->i_tex_bits += get_bits_diff(s);
236  else
237  s->p_tex_bits += get_bits_diff(s);
238 }
239 
240 const FFCodec ff_wmv2_encoder = {
241  .p.name = "wmv2",
242  CODEC_LONG_NAME("Windows Media Video 8"),
243  .p.type = AVMEDIA_TYPE_VIDEO,
244  .p.id = AV_CODEC_ID_WMV2,
245  .p.priv_class = &ff_mpv_enc_class,
246  .p.capabilities = AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
247  .priv_data_size = sizeof(WMV2EncContext),
248  .init = wmv2_encode_init,
249  FF_CODEC_ENCODE_CB(ff_mpv_encode_picture),
250  .close = ff_mpv_encode_end,
251  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
252  .p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
253  AV_PIX_FMT_NONE },
254 };
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:71
ff_mpv_enc_class
const AVClass ff_mpv_enc_class
Definition: mpegvideo_enc.c:101
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: codec_internal.h:42
get_bits_diff
static int get_bits_diff(MpegEncContext *s)
Definition: mpegvideoenc.h:158
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
ff_msmpeg4_handle_slices
void ff_msmpeg4_handle_slices(MpegEncContext *s)
Definition: msmpeg4enc.c:340
WMV2EncContext::abt_type
int abt_type
Definition: wmv2enc.c:42
ff_wmv2_encode_picture_header
int ff_wmv2_encode_picture_header(MpegEncContext *s)
Definition: wmv2enc.c:97
mpegvideoenc.h
init_put_bits
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:62
WMV2EncContext::msmpeg4
MSMPEG4EncContext msmpeg4
Definition: wmv2enc.c:37
put_bits
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:223
w
uint8_t w
Definition: llviddspenc.c:38
FFCodec
Definition: codec_internal.h:126
mpegvideo.h
wmv2enc.h
WMV2Context
Definition: wmv2.h:33
wmv2_encode_init
static av_cold int wmv2_encode_init(AVCodecContext *avctx)
Definition: wmv2enc.c:76
ff_mpv_encode_picture
int ff_mpv_encode_picture(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pic_arg, int *got_packet)
Definition: mpegvideo_enc.c:1754
WMV2EncContext::top_left_mv_flag
int top_left_mv_flag
Definition: wmv2enc.c:46
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:130
ff_wmv2_inter_table
const uint32_t(*const [WMV2_INTER_CBP_TABLE_COUNT] ff_wmv2_inter_table)[2]
Definition: msmpeg4data.c:1760
ff_h263_pred_motion
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:190
ff_wmv2_encoder
const FFCodec ff_wmv2_encoder
Definition: wmv2enc.c:240
val
static double val(void *priv, double ch)
Definition: aeval.c:78
FF_CODEC_ENCODE_CB
#define FF_CODEC_ENCODE_CB(func)
Definition: codec_internal.h:295
WMV2EncContext
Definition: wmv2enc.c:36
av_cold
#define av_cold
Definition: attributes.h:90
wmv2_get_cbp_table_index
static av_always_inline int wmv2_get_cbp_table_index(MpegEncContext *s, int cbp_index)
Definition: wmv2.h:46
msmpeg4data.h
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:524
s
#define s(width, name)
Definition: cbs_vp9.c:198
WMV2EncContext::j_type_bit
int j_type_bit
Definition: wmv2enc.c:39
AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE
#define AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE
This encoder can reorder user opaque values from input AVFrames and return them with corresponding ou...
Definition: codec.h:159
AV_CODEC_ID_WMV2
@ AV_CODEC_ID_WMV2
Definition: codec_id.h:70
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
SKIP_TYPE_NONE
#define SKIP_TYPE_NONE
Definition: wmv2.h:27
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:73
WMV2EncContext::per_mb_abt
int per_mb_abt
Definition: wmv2enc.c:43
PutBitContext
Definition: put_bits.h:50
ff_msmpeg4_encode_motion
void ff_msmpeg4_encode_motion(MpegEncContext *s, int mx, int my)
Definition: msmpeg4enc.c:307
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:271
WMV2EncContext::per_mb_rl_bit
int per_mb_rl_bit
Definition: wmv2enc.c:47
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:279
ff_msmp4_mb_i_table
const uint16_t ff_msmp4_mb_i_table[64][2]
Definition: msmpeg4_vc1_data.c:63
ff_mpv_encode_end
av_cold int ff_mpv_encode_end(AVCodecContext *avctx)
Definition: mpegvideo_enc.c:987
wmv2.h
MSMPEG4EncContext
Definition: msmpeg4enc.h:29
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:366
codec_internal.h
WMV2EncContext::cbp_table_index
int cbp_table_index
Definition: wmv2enc.c:45
WMV2_EXTRADATA_SIZE
#define WMV2_EXTRADATA_SIZE
Definition: wmv2enc.c:34
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
code
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
Definition: filter_design.txt:178
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:523
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:256
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
WMV2EncContext::common
WMV2Context common
Definition: wmv2enc.c:38
avcodec.h
msmpeg4.h
WMV2EncContext::j_type
int j_type
Definition: wmv2enc.c:40
pred
static const float pred[4]
Definition: siprdata.h:259
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
AVCodecContext
main external API structure.
Definition: avcodec.h:445
ff_msmpeg4_encode_block
void ff_msmpeg4_encode_block(MpegEncContext *s, int16_t *block, int n)
Definition: msmpeg4enc.c:561
ff_msmpeg4_code012
void ff_msmpeg4_code012(PutBitContext *pb, int n)
Definition: msmpeg4enc.c:69
ff_table_inter_intra
const uint8_t ff_table_inter_intra[4][2]
Definition: msmpeg4data.c:1648
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:72
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
msmpeg4enc.h
mem.h
msmpeg4_vc1_data.h
ff_mpv_encode_init
av_cold int ff_mpv_encode_init(AVCodecContext *avctx)
Definition: mpegvideo_enc.c:310
flush_put_bits
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:143
WMV2EncContext::abt_flag
int abt_flag
Definition: wmv2enc.c:41
encode_ext_header
static int encode_ext_header(WMV2EncContext *w)
Definition: wmv2enc.c:50
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:73
WMV2EncContext::mspel_bit
int mspel_bit
Definition: wmv2enc.c:44
ff_wmv2_common_init
av_cold void ff_wmv2_common_init(MpegEncContext *s)
Definition: wmv2.c:28
ff_wmv2_encode_mb
void ff_wmv2_encode_mb(MpegEncContext *s, int16_t block[6][64], int motion_x, int motion_y)
Definition: wmv2enc.c:170
ff_msmpeg4_coded_block_pred
int ff_msmpeg4_coded_block_pred(MpegEncContext *s, int n, uint8_t **coded_block_ptr)
Definition: msmpeg4.c:158
h263.h
Generated on Tue Apr 23 2024 19:22:04 for FFmpeg by   doxygen 1.8.17