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audio_convert.c
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1 /*
2  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3  * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <stdint.h>
23 
24 #include "config.h"
25 #include "libavutil/common.h"
26 #include "libavutil/libm.h"
27 #include "libavutil/log.h"
28 #include "libavutil/mem.h"
29 #include "libavutil/samplefmt.h"
30 #include "audio_convert.h"
31 #include "audio_data.h"
32 #include "dither.h"
33 #include "internal.h"
34 
35 enum ConvFuncType {
36  CONV_FUNC_TYPE_FLAT,
37  CONV_FUNC_TYPE_INTERLEAVE,
38  CONV_FUNC_TYPE_DEINTERLEAVE,
39 };
40 
41 typedef void (conv_func_flat)(uint8_t *out, const uint8_t *in, int len);
42 
43 typedef void (conv_func_interleave)(uint8_t *out, uint8_t *const *in,
44  int len, int channels);
45 
46 typedef void (conv_func_deinterleave)(uint8_t **out, const uint8_t *in, int len,
47  int channels);
48 
49 struct AudioConvert {
50  AVAudioResampleContext *avr;
51  DitherContext *dc;
52  enum AVSampleFormat in_fmt;
53  enum AVSampleFormat out_fmt;
54  int channels;
55  int planes;
56  int ptr_align;
57  int samples_align;
58  int has_optimized_func;
59  const char *func_descr;
60  const char *func_descr_generic;
61  enum ConvFuncType func_type;
62  conv_func_flat *conv_flat;
63  conv_func_flat *conv_flat_generic;
64  conv_func_interleave *conv_interleave;
65  conv_func_interleave *conv_interleave_generic;
66  conv_func_deinterleave *conv_deinterleave;
67  conv_func_deinterleave *conv_deinterleave_generic;
68 };
69 
70 void ff_audio_convert_set_func(AudioConvert *ac, enum AVSampleFormat out_fmt,
71  enum AVSampleFormat in_fmt, int channels,
72  int ptr_align, int samples_align,
73  const char *descr, void *conv)
74 {
75  int found = 0;
76 
77  switch (ac->func_type) {
78  case CONV_FUNC_TYPE_FLAT:
79  if (av_get_packed_sample_fmt(ac->in_fmt) == in_fmt &&
80  av_get_packed_sample_fmt(ac->out_fmt) == out_fmt) {
81  ac->conv_flat = conv;
82  ac->func_descr = descr;
83  ac->ptr_align = ptr_align;
84  ac->samples_align = samples_align;
85  if (ptr_align == 1 && samples_align == 1) {
86  ac->conv_flat_generic = conv;
87  ac->func_descr_generic = descr;
88  } else {
89  ac->has_optimized_func = 1;
90  }
91  found = 1;
92  }
93  break;
94  case CONV_FUNC_TYPE_INTERLEAVE:
95  if (ac->in_fmt == in_fmt && ac->out_fmt == out_fmt &&
96  (!channels || ac->channels == channels)) {
97  ac->conv_interleave = conv;
98  ac->func_descr = descr;
99  ac->ptr_align = ptr_align;
100  ac->samples_align = samples_align;
101  if (ptr_align == 1 && samples_align == 1) {
102  ac->conv_interleave_generic = conv;
103  ac->func_descr_generic = descr;
104  } else {
105  ac->has_optimized_func = 1;
106  }
107  found = 1;
108  }
109  break;
110  case CONV_FUNC_TYPE_DEINTERLEAVE:
111  if (ac->in_fmt == in_fmt && ac->out_fmt == out_fmt &&
112  (!channels || ac->channels == channels)) {
113  ac->conv_deinterleave = conv;
114  ac->func_descr = descr;
115  ac->ptr_align = ptr_align;
116  ac->samples_align = samples_align;
117  if (ptr_align == 1 && samples_align == 1) {
118  ac->conv_deinterleave_generic = conv;
119  ac->func_descr_generic = descr;
120  } else {
121  ac->has_optimized_func = 1;
122  }
123  found = 1;
124  }
125  break;
126  }
127  if (found) {
128  av_log(ac->avr, AV_LOG_DEBUG, "audio_convert: found function: %-4s "
129  "to %-4s (%s)\n", av_get_sample_fmt_name(ac->in_fmt),
130  av_get_sample_fmt_name(ac->out_fmt), descr);
131  }
132 }
133 
134 #define CONV_FUNC_NAME(dst_fmt, src_fmt) conv_ ## src_fmt ## _to_ ## dst_fmt
135 
136 #define CONV_LOOP(otype, expr) \
137  do { \
138  *(otype *)po = expr; \
139  pi += is; \
140  po += os; \
141  } while (po < end); \
142 
143 #define CONV_FUNC_FLAT(ofmt, otype, ifmt, itype, expr) \
144 static void CONV_FUNC_NAME(ofmt, ifmt)(uint8_t *out, const uint8_t *in, \
145  int len) \
146 { \
147  int is = sizeof(itype); \
148  int os = sizeof(otype); \
149  const uint8_t *pi = in; \
150  uint8_t *po = out; \
151  uint8_t *end = out + os * len; \
152  CONV_LOOP(otype, expr) \
153 }
154 
155 #define CONV_FUNC_INTERLEAVE(ofmt, otype, ifmt, itype, expr) \
156 static void CONV_FUNC_NAME(ofmt, ifmt)(uint8_t *out, const uint8_t **in, \
157  int len, int channels) \
158 { \
159  int ch; \
160  int out_bps = sizeof(otype); \
161  int is = sizeof(itype); \
162  int os = channels * out_bps; \
163  for (ch = 0; ch < channels; ch++) { \
164  const uint8_t *pi = in[ch]; \
165  uint8_t *po = out + ch * out_bps; \
166  uint8_t *end = po + os * len; \
167  CONV_LOOP(otype, expr) \
168  } \
169 }
170 
171 #define CONV_FUNC_DEINTERLEAVE(ofmt, otype, ifmt, itype, expr) \
172 static void CONV_FUNC_NAME(ofmt, ifmt)(uint8_t **out, const uint8_t *in, \
173  int len, int channels) \
174 { \
175  int ch; \
176  int in_bps = sizeof(itype); \
177  int is = channels * in_bps; \
178  int os = sizeof(otype); \
179  for (ch = 0; ch < channels; ch++) { \
180  const uint8_t *pi = in + ch * in_bps; \
181  uint8_t *po = out[ch]; \
182  uint8_t *end = po + os * len; \
183  CONV_LOOP(otype, expr) \
184  } \
185 }
186 
187 #define CONV_FUNC_GROUP(ofmt, otype, ifmt, itype, expr) \
188 CONV_FUNC_FLAT( ofmt, otype, ifmt, itype, expr) \
189 CONV_FUNC_INTERLEAVE( ofmt, otype, ifmt ## P, itype, expr) \
190 CONV_FUNC_DEINTERLEAVE(ofmt ## P, otype, ifmt, itype, expr)
191 
192 CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_U8, uint8_t, *(const uint8_t *)pi)
193 CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_U8, uint8_t, (*(const uint8_t *)pi - 0x80) << 8)
194 CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_U8, uint8_t, (*(const uint8_t *)pi - 0x80) << 24)
195 CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t, (*(const uint8_t *)pi - 0x80) * (1.0f / (1 << 7)))
196 CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t, (*(const uint8_t *)pi - 0x80) * (1.0 / (1 << 7)))
197 CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t, (*(const int16_t *)pi >> 8) + 0x80)
198 CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *)pi)
199 CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *)pi << 16)
200 CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *)pi * (1.0f / (1 << 15)))
201 CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *)pi * (1.0 / (1 << 15)))
202 CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t, (*(const int32_t *)pi >> 24) + 0x80)
203 CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *)pi >> 16)
204 CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *)pi)
205 CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *)pi * (1.0f / (1U << 31)))
206 CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *)pi * (1.0 / (1U << 31)))
207 CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8( lrintf(*(const float *)pi * (1 << 7)) + 0x80))
208 CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16( lrintf(*(const float *)pi * (1 << 15))))
209 CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *)pi * (1U << 31))))
210 CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_FLT, float, *(const float *)pi)
211 CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_FLT, float, *(const float *)pi)
212 CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8( lrint(*(const double *)pi * (1 << 7)) + 0x80))
213 CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16( lrint(*(const double *)pi * (1 << 15))))
214 CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *)pi * (1U << 31))))
215 CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_DBL, double, *(const double *)pi)
216 CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_DBL, double, *(const double *)pi)
217 
218 #define SET_CONV_FUNC_GROUP(ofmt, ifmt) \
219 ff_audio_convert_set_func(ac, ofmt, ifmt, 0, 1, 1, "C", CONV_FUNC_NAME(ofmt, ifmt)); \
220 ff_audio_convert_set_func(ac, ofmt ## P, ifmt, 0, 1, 1, "C", CONV_FUNC_NAME(ofmt ## P, ifmt)); \
221 ff_audio_convert_set_func(ac, ofmt, ifmt ## P, 0, 1, 1, "C", CONV_FUNC_NAME(ofmt, ifmt ## P));
222 
223 static void set_generic_function(AudioConvert *ac)
224 {
225  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_U8)
226  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_U8)
227  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_U8)
228  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_U8)
229  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_U8)
230  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_S16)
231  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16)
232  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S16)
233  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16)
234  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_S16)
235  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_S32)
236  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32)
237  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32)
238  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S32)
239  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_S32)
240  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_FLT)
241  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLT)
242  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_FLT)
243  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLT)
244  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_FLT)
245  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_DBL)
246  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_DBL)
247  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_DBL)
248  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_DBL)
249  SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBL)
250 }
251 
252 void ff_audio_convert_free(AudioConvert **ac)
253 {
254  if (!*ac)
255  return;
256  ff_dither_free(&(*ac)->dc);
257  av_freep(ac);
258 }
259 
260 AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr,
261  enum AVSampleFormat out_fmt,
262  enum AVSampleFormat in_fmt,
263  int channels, int sample_rate)
264 {
265  AudioConvert *ac;
266  int in_planar, out_planar;
267 
268  ac = av_mallocz(sizeof(*ac));
269  if (!ac)
270  return NULL;
271 
272  ac->avr = avr;
273  ac->out_fmt = out_fmt;
274  ac->in_fmt = in_fmt;
275  ac->channels = channels;
276 
277  if (avr->dither_method != AV_RESAMPLE_DITHER_NONE &&
278  av_get_packed_sample_fmt(out_fmt) == AV_SAMPLE_FMT_S16 &&
279  av_get_bytes_per_sample(in_fmt) > 2) {
280  ac->dc = ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate);
281  if (!ac->dc) {
282  av_free(ac);
283  return NULL;
284  }
285  return ac;
286  }
287 
288  in_planar = av_sample_fmt_is_planar(in_fmt);
289  out_planar = av_sample_fmt_is_planar(out_fmt);
290 
291  if (in_planar == out_planar) {
292  ac->func_type = CONV_FUNC_TYPE_FLAT;
293  ac->planes = in_planar ? ac->channels : 1;
294  } else if (in_planar)
295  ac->func_type = CONV_FUNC_TYPE_INTERLEAVE;
296  else
297  ac->func_type = CONV_FUNC_TYPE_DEINTERLEAVE;
298 
299  set_generic_function(ac);
300 
301  if (ARCH_ARM)
302  ff_audio_convert_init_arm(ac);
303  if (ARCH_X86)
304  ff_audio_convert_init_x86(ac);
305 
306  return ac;
307 }
308 
309 int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in)
310 {
311  int use_generic = 1;
312  int len = in->nb_samples;
313 
314  if (ac->dc) {
315  /* dithered conversion */
316  av_dlog(ac->avr, "%d samples - audio_convert: %s to %s (dithered)\n",
317  len, av_get_sample_fmt_name(ac->in_fmt),
318  av_get_sample_fmt_name(ac->out_fmt));
319 
320  return ff_convert_dither(ac->dc, out, in);
321  }
322 
323  /* determine whether to use the optimized function based on pointer and
324  samples alignment in both the input and output */
325  if (ac->has_optimized_func) {
326  int ptr_align = FFMIN(in->ptr_align, out->ptr_align);
327  int samples_align = FFMIN(in->samples_align, out->samples_align);
328  int aligned_len = FFALIGN(len, ac->samples_align);
329  if (!(ptr_align % ac->ptr_align) && samples_align >= aligned_len) {
330  len = aligned_len;
331  use_generic = 0;
332  }
333  }
334  av_dlog(ac->avr, "%d samples - audio_convert: %s to %s (%s)\n", len,
335  av_get_sample_fmt_name(ac->in_fmt),
336  av_get_sample_fmt_name(ac->out_fmt),
337  use_generic ? ac->func_descr_generic : ac->func_descr);
338 
339  switch (ac->func_type) {
340  case CONV_FUNC_TYPE_FLAT: {
341  int p;
342  if (!in->is_planar)
343  len *= in->channels;
344  if (use_generic) {
345  for (p = 0; p < ac->planes; p++)
346  ac->conv_flat_generic(out->data[p], in->data[p], len);
347  } else {
348  for (p = 0; p < ac->planes; p++)
349  ac->conv_flat(out->data[p], in->data[p], len);
350  }
351  break;
352  }
353  case CONV_FUNC_TYPE_INTERLEAVE:
354  if (use_generic)
355  ac->conv_interleave_generic(out->data[0], in->data, len, ac->channels);
356  else
357  ac->conv_interleave(out->data[0], in->data, len, ac->channels);
358  break;
359  case CONV_FUNC_TYPE_DEINTERLEAVE:
360  if (use_generic)
361  ac->conv_deinterleave_generic(out->data, in->data[0], len, ac->channels);
362  else
363  ac->conv_deinterleave(out->data, in->data[0], len, ac->channels);
364  break;
365  }
366 
367  out->nb_samples = in->nb_samples;
368  return 0;
369 }
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