Libav
fifo.c
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1 /*
2  * Copyright (c) 2007 Bobby Bingham
3  *
4  * This file is part of Libav.
5  *
6  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
26 #include "libavutil/avassert.h"
28 #include "libavutil/common.h"
29 #include "libavutil/mathematics.h"
30 #include "libavutil/samplefmt.h"
31 
32 #include "audio.h"
33 #include "avfilter.h"
34 #include "internal.h"
35 #include "video.h"
36 
37 typedef struct Buf {
39  struct Buf *next;
40 } Buf;
41 
42 typedef struct FifoContext {
44  Buf *last;
45 
52 } FifoContext;
53 
54 static av_cold int init(AVFilterContext *ctx)
55 {
56  FifoContext *fifo = ctx->priv;
57  fifo->last = &fifo->root;
58 
59  return 0;
60 }
61 
62 static av_cold void uninit(AVFilterContext *ctx)
63 {
64  FifoContext *fifo = ctx->priv;
65  Buf *buf, *tmp;
66 
67  for (buf = fifo->root.next; buf; buf = tmp) {
68  tmp = buf->next;
69  av_frame_free(&buf->frame);
70  av_free(buf);
71  }
72 
73  av_frame_free(&fifo->out);
74 }
75 
76 static int add_to_queue(AVFilterLink *inlink, AVFrame *frame)
77 {
78  FifoContext *fifo = inlink->dst->priv;
79 
80  fifo->last->next = av_mallocz(sizeof(Buf));
81  if (!fifo->last->next) {
82  av_frame_free(&frame);
83  return AVERROR(ENOMEM);
84  }
85 
86  fifo->last = fifo->last->next;
87  fifo->last->frame = frame;
88 
89  return 0;
90 }
91 
92 static void queue_pop(FifoContext *s)
93 {
94  Buf *tmp = s->root.next->next;
95  if (s->last == s->root.next)
96  s->last = &s->root;
97  av_freep(&s->root.next);
98  s->root.next = tmp;
99 }
100 
105  int offset)
106 {
108  int planar = av_sample_fmt_is_planar(link->format);
109  int planes = planar ? nb_channels : 1;
110  int block_align = av_get_bytes_per_sample(link->format) * (planar ? 1 : nb_channels);
111  int i;
112 
113  av_assert0(frame->nb_samples > offset);
114 
115  for (i = 0; i < planes; i++)
116  frame->extended_data[i] += block_align * offset;
117  if (frame->data != frame->extended_data)
118  memcpy(frame->data, frame->extended_data,
119  FFMIN(planes, FF_ARRAY_ELEMS(frame->data)) * sizeof(*frame->data));
120  frame->linesize[0] -= block_align*offset;
121  frame->nb_samples -= offset;
122 
123  if (frame->pts != AV_NOPTS_VALUE) {
124  frame->pts += av_rescale_q(offset, (AVRational){1, link->sample_rate},
125  link->time_base);
126  }
127 }
128 
130 {
131  int planes = av_sample_fmt_is_planar(frame->format) ?
133  int min_align = 128;
134  int p;
135 
136  for (p = 0; p < planes; p++) {
137  int cur_align = 128;
138  while ((intptr_t)frame->extended_data[p] % cur_align)
139  cur_align >>= 1;
140  if (cur_align < min_align)
141  min_align = cur_align;
142  }
143  return min_align;
144 }
145 
147 {
148  AVFilterLink *link = ctx->outputs[0];
149  FifoContext *s = ctx->priv;
150  AVFrame *head = s->root.next ? s->root.next->frame : NULL;
151  AVFrame *out;
152  int ret;
153 
154  /* if head is NULL then we're flushing the remaining samples in out */
155  if (!head && !s->out)
156  return AVERROR_EOF;
157 
158  if (!s->out &&
159  head->nb_samples >= link->request_samples &&
160  calc_ptr_alignment(head) >= 32) {
161  if (head->nb_samples == link->request_samples) {
162  out = head;
163  queue_pop(s);
164  } else {
165  out = av_frame_clone(head);
166  if (!out)
167  return AVERROR(ENOMEM);
168 
169  out->nb_samples = link->request_samples;
170  buffer_offset(link, head, link->request_samples);
171  }
172  } else {
174 
175  if (!s->out) {
176  s->out = ff_get_audio_buffer(link, link->request_samples);
177  if (!s->out)
178  return AVERROR(ENOMEM);
179 
180  s->out->nb_samples = 0;
181  s->out->pts = head->pts;
183  } else if (link->request_samples != s->allocated_samples) {
184  av_log(ctx, AV_LOG_ERROR, "request_samples changed before the "
185  "buffer was returned.\n");
186  return AVERROR(EINVAL);
187  }
188 
189  while (s->out->nb_samples < s->allocated_samples) {
190  int len;
191 
192  if (!s->root.next) {
193  ret = ff_request_frame(ctx->inputs[0]);
194  if (ret == AVERROR_EOF) {
196  s->out->nb_samples,
197  s->allocated_samples -
198  s->out->nb_samples,
199  nb_channels, link->format);
201  break;
202  } else if (ret < 0)
203  return ret;
204  }
205  head = s->root.next->frame;
206 
207  len = FFMIN(s->allocated_samples - s->out->nb_samples,
208  head->nb_samples);
209 
211  s->out->nb_samples, 0, len, nb_channels,
212  link->format);
213  s->out->nb_samples += len;
214 
215  if (len == head->nb_samples) {
216  av_frame_free(&head);
217  queue_pop(s);
218  } else {
219  buffer_offset(link, head, len);
220  }
221  }
222  out = s->out;
223  s->out = NULL;
224  }
225  return ff_filter_frame(link, out);
226 }
227 
228 static int request_frame(AVFilterLink *outlink)
229 {
230  FifoContext *fifo = outlink->src->priv;
231  int ret = 0;
232 
233  if (!fifo->root.next) {
234  if ((ret = ff_request_frame(outlink->src->inputs[0])) < 0) {
235  if (ret == AVERROR_EOF && outlink->request_samples)
236  return return_audio_frame(outlink->src);
237  return ret;
238  }
239  }
240 
241  if (outlink->request_samples) {
242  return return_audio_frame(outlink->src);
243  } else {
244  ret = ff_filter_frame(outlink, fifo->root.next->frame);
245  queue_pop(fifo);
246  }
247 
248  return ret;
249 }
250 
252  {
253  .name = "default",
254  .type = AVMEDIA_TYPE_VIDEO,
255  .get_video_buffer = ff_null_get_video_buffer,
256  .filter_frame = add_to_queue,
257  },
258  { NULL }
259 };
260 
262  {
263  .name = "default",
264  .type = AVMEDIA_TYPE_VIDEO,
265  .request_frame = request_frame,
266  },
267  { NULL }
268 };
269 
271  .name = "fifo",
272  .description = NULL_IF_CONFIG_SMALL("Buffer input images and send them when they are requested."),
273 
274  .init = init,
275  .uninit = uninit,
276 
277  .priv_size = sizeof(FifoContext),
278 
281 };
282 
284  {
285  .name = "default",
286  .type = AVMEDIA_TYPE_AUDIO,
287  .get_audio_buffer = ff_null_get_audio_buffer,
288  .filter_frame = add_to_queue,
289  },
290  { NULL }
291 };
292 
294  {
295  .name = "default",
296  .type = AVMEDIA_TYPE_AUDIO,
297  .request_frame = request_frame,
298  },
299  { NULL }
300 };
301 
303  .name = "afifo",
304  .description = NULL_IF_CONFIG_SMALL("Buffer input frames and send them when they are requested."),
305 
306  .init = init,
307  .uninit = uninit,
308 
309  .priv_size = sizeof(FifoContext),
310 
313 };
static int calc_ptr_alignment(AVFrame *frame)
Definition: fifo.c:129
AVFrame * out
When a specific number of output samples is requested, the partial buffer is stored here...
Definition: fifo.c:50
AVFilter ff_vf_fifo
Definition: fifo.c:270
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
Buf * last
last buffered frame
Definition: fifo.c:44
static av_cold int init(AVFilterContext *ctx)
Definition: fifo.c:54
static const AVFilterPad outputs[]
Definition: af_ashowinfo.c:232
static const AVFilterPad avfilter_vf_fifo_inputs[]
Definition: fifo.c:251
Main libavfilter public API header.
static void queue_pop(FifoContext *s)
Definition: fifo.c:92
AVFrame * ff_null_get_video_buffer(AVFilterLink *link, int w, int h)
Definition: video.c:30
static av_cold void uninit(AVFilterContext *ctx)
Definition: fifo.c:62
#define FF_ARRAY_ELEMS(a)
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_dlog(ac->avr, "%d samples - audio_convert: %s to %s (dithered)\", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> out
static int add_to_queue(AVFilterLink *inlink, AVFrame *frame)
Definition: fifo.c:76
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:198
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:571
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
AVFrame * frame
Definition: fifo.c:38
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:733
#define av_cold
Definition: attributes.h:66
Definition: fifo.c:37
AVFilter ff_af_afifo
Definition: fifo.c:302
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:211
#define AVERROR_EOF
End of file.
Definition: error.h:51
static const AVFilterPad avfilter_vf_fifo_outputs[]
Definition: fifo.c:261
Buf root
Definition: fifo.c:43
static const AVFilterPad avfilter_af_afifo_inputs[]
Definition: fifo.c:283
int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
Check if the sample format is planar.
Definition: samplefmt.c:101
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:129
struct Buf * next
Definition: fifo.c:39
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:186
int av_samples_set_silence(uint8_t **audio_data, int offset, int nb_samples, int nb_channels, enum AVSampleFormat sample_fmt)
Fill an audio buffer with silence.
Definition: samplefmt.c:206
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
Definition: audio.c:57
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:69
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:145
void * priv
private data for use by the filter
Definition: avfilter.h:584
int av_get_channel_layout_nb_channels(uint64_t channel_layout)
Return the number of channels in the channel layout.
simple assert() macros that are a bit more flexible than ISO C assert().
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
int allocated_samples
number of samples out was allocated for
Definition: fifo.c:51
uint64_t channel_layout
Channel layout of the audio data.
Definition: frame.h:381
audio channel layout utility functions
#define FFMIN(a, b)
Definition: common.h:57
static void buffer_offset(AVFilterLink *link, AVFrame *frame, int offset)
Move data pointers and pts offset samples forward.
Definition: fifo.c:104
AVFrame * ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples)
get_audio_buffer() handler for filters which simply pass audio along
Definition: audio.c:26
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:270
if(ac->has_optimized_func)
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:186
NULL
Definition: eval.c:55
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:153
int av_samples_copy(uint8_t **dst, uint8_t *const *src, int dst_offset, int src_offset, int nb_samples, int nb_channels, enum AVSampleFormat sample_fmt)
Copy samples from src to dst.
Definition: samplefmt.c:187
static int request_frame(AVFilterLink *outlink)
Definition: fifo.c:228
Filter definition.
Definition: avfilter.h:421
static const AVFilterPad inputs[]
Definition: af_ashowinfo.c:221
rational number numerator/denominator
Definition: rational.h:43
const char * name
Filter name.
Definition: avfilter.h:425
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:578
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
Return number of bytes per sample.
Definition: samplefmt.c:95
common internal and external API header
static int return_audio_frame(AVFilterContext *ctx)
Definition: fifo.c:146
struct AVFilterPad AVFilterPad
Definition: avfilter.h:67
int len
static const AVFilterPad avfilter_af_afifo_outputs[]
Definition: fifo.c:293
An instance of a filter.
Definition: avfilter.h:563
int ff_request_frame(AVFilterLink *link)
Request an input frame from the filter at the other end of the link.
Definition: avfilter.c:249
int nb_channels
internal API functions
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:169
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:179
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:205
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:228