FFmpeg
settb.c
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1 /*
2  * Copyright (c) 2010 Stefano Sabatini
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 /**
22  * @file
23  * Set timebase for the output link.
24  */
25 
26 #include <inttypes.h>
27 #include <stdio.h>
28 
29 #include "libavutil/avstring.h"
30 #include "libavutil/eval.h"
31 #include "libavutil/internal.h"
32 #include "libavutil/mathematics.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/rational.h"
35 #include "audio.h"
36 #include "avfilter.h"
37 #include "filters.h"
38 #include "internal.h"
39 #include "video.h"
40 
41 static const char *const var_names[] = {
42  "AVTB", /* default timebase 1/AV_TIME_BASE */
43  "intb", /* input timebase */
44  "sr", /* sample rate */
45  NULL
46 };
47 
48 enum var_name {
53 };
54 
55 typedef struct SetTBContext {
56  const AVClass *class;
57  char *tb_expr;
59 } SetTBContext;
60 
61 #define OFFSET(x) offsetof(SetTBContext, x)
62 #define DEFINE_OPTIONS(filt_name, filt_type) \
63 static const AVOption filt_name##_options[] = { \
64  { "expr", "set expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \
65  .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM }, \
66  { "tb", "set expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \
67  .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM }, \
68  { NULL } \
69 }
70 
71 static int config_output_props(AVFilterLink *outlink)
72 {
73  AVFilterContext *ctx = outlink->src;
74  SetTBContext *settb = ctx->priv;
75  AVFilterLink *inlink = ctx->inputs[0];
76  AVRational time_base;
77  int ret;
78  double res;
79 
81  settb->var_values[VAR_INTB] = av_q2d(inlink->time_base);
82  settb->var_values[VAR_SR] = inlink->sample_rate;
83 
84  outlink->w = inlink->w;
85  outlink->h = inlink->h;
86 
87  if ((ret = av_expr_parse_and_eval(&res, settb->tb_expr, var_names, settb->var_values,
88  NULL, NULL, NULL, NULL, NULL, 0, NULL)) < 0) {
89  av_log(ctx, AV_LOG_ERROR, "Invalid expression '%s' for timebase.\n", settb->tb_expr);
90  return ret;
91  }
92  time_base = av_d2q(res, INT_MAX);
93  if (time_base.num <= 0 || time_base.den <= 0) {
94  av_log(ctx, AV_LOG_ERROR,
95  "Invalid non-positive values for the timebase num:%d or den:%d.\n",
96  time_base.num, time_base.den);
97  return AVERROR(EINVAL);
98  }
99 
100  outlink->time_base = time_base;
101  av_log(outlink->src, AV_LOG_VERBOSE, "tb:%d/%d -> tb:%d/%d\n",
102  inlink ->time_base.num, inlink ->time_base.den,
103  outlink->time_base.num, outlink->time_base.den);
104 
105  return 0;
106 }
107 
108 static int64_t rescale_pts(AVFilterLink *inlink, AVFilterLink *outlink, int64_t orig_pts)
109 {
110  AVFilterContext *ctx = inlink->dst;
111  int64_t new_pts = orig_pts;
112 
113  if (av_cmp_q(inlink->time_base, outlink->time_base)) {
114  new_pts = av_rescale_q(orig_pts, inlink->time_base, outlink->time_base);
115  av_log(ctx, AV_LOG_DEBUG, "tb:%d/%d pts:%"PRId64" -> tb:%d/%d pts:%"PRId64"\n",
116  inlink ->time_base.num, inlink ->time_base.den, orig_pts,
117  outlink->time_base.num, outlink->time_base.den, new_pts);
118  }
119 
120  return new_pts;
121 }
122 
124 {
125  AVFilterContext *ctx = inlink->dst;
126  AVFilterLink *outlink = ctx->outputs[0];
127 
128  frame->pts = rescale_pts(inlink, outlink, frame->pts);
129 
130  return ff_filter_frame(outlink, frame);
131 }
132 
134 {
135  AVFilterLink *inlink = ctx->inputs[0];
136  AVFilterLink *outlink = ctx->outputs[0];
137  AVFrame *in;
138  int status;
139  int64_t pts;
140  int ret;
141 
142  FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
143 
144  ret = ff_inlink_consume_frame(inlink, &in);
145  if (ret < 0)
146  return ret;
147  if (ret > 0)
148  return filter_frame(inlink, in);
149 
150  if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
151  ff_outlink_set_status(outlink, status, rescale_pts(inlink, outlink, pts));
152  return 0;
153  }
154 
155  FF_FILTER_FORWARD_WANTED(outlink, inlink);
156 
157  return FFERROR_NOT_READY;
158 }
159 
160 #if CONFIG_SETTB_FILTER
161 
162 DEFINE_OPTIONS(settb, VIDEO);
163 AVFILTER_DEFINE_CLASS(settb);
164 
165 static const AVFilterPad avfilter_vf_settb_inputs[] = {
166  {
167  .name = "default",
168  .type = AVMEDIA_TYPE_VIDEO,
169  },
170  { NULL }
171 };
172 
173 static const AVFilterPad avfilter_vf_settb_outputs[] = {
174  {
175  .name = "default",
176  .type = AVMEDIA_TYPE_VIDEO,
177  .config_props = config_output_props,
178  },
179  { NULL }
180 };
181 
183  .name = "settb",
184  .description = NULL_IF_CONFIG_SMALL("Set timebase for the video output link."),
185  .priv_size = sizeof(SetTBContext),
186  .priv_class = &settb_class,
187  .inputs = avfilter_vf_settb_inputs,
188  .outputs = avfilter_vf_settb_outputs,
189  .activate = activate,
190 };
191 #endif /* CONFIG_SETTB_FILTER */
192 
193 #if CONFIG_ASETTB_FILTER
194 
195 DEFINE_OPTIONS(asettb, AUDIO);
196 AVFILTER_DEFINE_CLASS(asettb);
197 
198 static const AVFilterPad avfilter_af_asettb_inputs[] = {
199  {
200  .name = "default",
201  .type = AVMEDIA_TYPE_AUDIO,
202  },
203  { NULL }
204 };
205 
206 static const AVFilterPad avfilter_af_asettb_outputs[] = {
207  {
208  .name = "default",
209  .type = AVMEDIA_TYPE_AUDIO,
210  .config_props = config_output_props,
211  },
212  { NULL }
213 };
214 
216  .name = "asettb",
217  .description = NULL_IF_CONFIG_SMALL("Set timebase for the audio output link."),
218  .priv_size = sizeof(SetTBContext),
219  .inputs = avfilter_af_asettb_inputs,
220  .outputs = avfilter_af_asettb_outputs,
221  .priv_class = &asettb_class,
222  .activate = activate,
223 };
224 #endif /* CONFIG_ASETTB_FILTER */
int ff_inlink_consume_frame(AVFilterLink *link, AVFrame **rframe)
Take a frame from the link&#39;s FIFO and update the link&#39;s stats.
Definition: avfilter.c:1494
#define NULL
Definition: coverity.c:32
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
static int activate(AVFilterContext *ctx)
Definition: settb.c:133
Main libavfilter public API header.
static const char *const var_names[]
Definition: settb.c:41
int num
Numerator.
Definition: rational.h:59
static int64_t rescale_pts(AVFilterLink *inlink, AVFilterLink *outlink, int64_t orig_pts)
Definition: settb.c:108
#define DEFINE_OPTIONS(filt_name, filt_type)
Definition: settb.c:62
return FFERROR_NOT_READY
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: settb.c:123
Definition: settb.c:49
static void ff_outlink_set_status(AVFilterLink *link, int status, int64_t pts)
Set the status field of a link from the source filter.
Definition: filters.h:189
char * tb_expr
Definition: settb.c:57
const char * name
Pad name.
Definition: internal.h:60
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:346
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1093
AVOptions.
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:388
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
static int config_output_props(AVFilterLink *outlink)
Definition: settb.c:71
#define av_log(a,...)
#define FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink)
Forward the status on an output link to an input link.
Definition: filters.h:199
A filter pad used for either input or output.
Definition: internal.h:54
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
int ff_inlink_acknowledge_status(AVFilterLink *link, int *rstatus, int64_t *rpts)
Test and acknowledge the change of status on the link.
Definition: avfilter.c:1449
int av_expr_parse_and_eval(double *d, const char *s, const char *const *const_names, const double *const_values, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), void *opaque, int log_offset, void *log_ctx)
Parse and evaluate an expression.
Definition: eval.c:764
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
void * priv
private data for use by the filter
Definition: avfilter.h:353
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
var_name
Definition: aeval.c:46
common internal API header
AVFilter ff_vf_settb
AVFormatContext * ctx
Definition: movenc.c:48
Definition: settb.c:51
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several inputs
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31))))#define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac){}void ff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map){AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);return NULL;}return ac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;}int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){int use_generic=1;int len=in->nb_samples;int p;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
Rational number (pair of numerator and denominator).
Definition: rational.h:58
they must not be accessed directly The fifo field contains the frames that are queued in the input for processing by the filter The status_in and status_out fields contains the queued status(EOF or error) of the link
const char * name
Filter name.
Definition: avfilter.h:148
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
static int64_t pts
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:106
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
static int av_cmp_q(AVRational a, AVRational b)
Compare two rationals.
Definition: rational.h:89
Utilties for rational number calculation.
int den
Denominator.
Definition: rational.h:60
Definition: settb.c:50
FF_FILTER_FORWARD_WANTED(outlink, inlink)
#define AVFILTER_DEFINE_CLASS(fname)
Definition: internal.h:334
An instance of a filter.
Definition: avfilter.h:338
double var_values[VAR_VARS_NB]
Definition: settb.c:58
internal API functions
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
AVFilter ff_af_asettb
simple arithmetic expression evaluator