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asrc_flite.c
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1 /*
2  * Copyright (c) 2012 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  * flite voice synth source
24  */
25 
26 #include <flite/flite.h>
28 #include "libavutil/file.h"
29 #include "libavutil/opt.h"
30 #include "avfilter.h"
31 #include "audio.h"
32 #include "formats.h"
33 #include "internal.h"
34 
35 typedef struct {
36  const AVClass *class;
37  char *voice_str;
38  char *textfile;
39  char *text;
40  cst_wave *wave;
41  int16_t *wave_samples;
44  cst_voice *voice;
46  int64_t pts;
47  int frame_nb_samples; ///< number of samples per frame
48 } FliteContext;
49 
50 #define OFFSET(x) offsetof(FliteContext, x)
51 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
52 
53 static const AVOption flite_options[] = {
54  { "list_voices", "list voices and exit", OFFSET(list_voices), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
55  { "nb_samples", "set number of samples per frame", OFFSET(frame_nb_samples), AV_OPT_TYPE_INT, {.i64=512}, 0, INT_MAX, FLAGS },
56  { "n", "set number of samples per frame", OFFSET(frame_nb_samples), AV_OPT_TYPE_INT, {.i64=512}, 0, INT_MAX, FLAGS },
57  { "text", "set text to speak", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
58  { "textfile", "set filename of the text to speak", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
59  { "v", "set voice", OFFSET(voice_str), AV_OPT_TYPE_STRING, {.str="kal"}, CHAR_MIN, CHAR_MAX, FLAGS },
60  { "voice", "set voice", OFFSET(voice_str), AV_OPT_TYPE_STRING, {.str="kal"}, CHAR_MIN, CHAR_MAX, FLAGS },
61  { NULL }
62 };
63 
65 
66 static volatile int flite_inited = 0;
67 
68 /* declare functions for all the supported voices */
69 #define DECLARE_REGISTER_VOICE_FN(name) \
70  cst_voice *register_cmu_us_## name(const char *); \
71  void unregister_cmu_us_## name(cst_voice *);
77 
78 struct voice_entry {
79  const char *name;
80  cst_voice * (*register_fn)(const char *);
81  void (*unregister_fn)(cst_voice *);
82  cst_voice *voice;
83  unsigned usage_count;
84 } voice_entry;
85 
86 #define MAKE_VOICE_STRUCTURE(voice_name) { \
87  .name = #voice_name, \
88  .register_fn = register_cmu_us_ ## voice_name, \
89  .unregister_fn = unregister_cmu_us_ ## voice_name, \
90 }
91 static struct voice_entry voice_entries[] = {
94  MAKE_VOICE_STRUCTURE(kal16),
97 };
98 
99 static void list_voices(void *log_ctx, const char *sep)
100 {
101  int i, n = FF_ARRAY_ELEMS(voice_entries);
102  for (i = 0; i < n; i++)
103  av_log(log_ctx, AV_LOG_INFO, "%s%s",
104  voice_entries[i].name, i < (n-1) ? sep : "\n");
105 }
106 
107 static int select_voice(struct voice_entry **entry_ret, const char *voice_name, void *log_ctx)
108 {
109  int i;
110 
111  for (i = 0; i < FF_ARRAY_ELEMS(voice_entries); i++) {
112  struct voice_entry *entry = &voice_entries[i];
113  if (!strcmp(entry->name, voice_name)) {
114  if (!entry->voice)
115  entry->voice = entry->register_fn(NULL);
116  if (!entry->voice) {
117  av_log(log_ctx, AV_LOG_ERROR,
118  "Could not register voice '%s'\n", voice_name);
119  return AVERROR_UNKNOWN;
120  }
121  entry->usage_count++;
122  *entry_ret = entry;
123  return 0;
124  }
125  }
126 
127  av_log(log_ctx, AV_LOG_ERROR, "Could not find voice '%s'\n", voice_name);
128  av_log(log_ctx, AV_LOG_INFO, "Choose between the voices: ");
129  list_voices(log_ctx, ", ");
130 
131  return AVERROR(EINVAL);
132 }
133 
134 static av_cold int init(AVFilterContext *ctx)
135 {
136  FliteContext *flite = ctx->priv;
137  int ret = 0;
138 
139  if (flite->list_voices) {
140  list_voices(ctx, "\n");
141  return AVERROR_EXIT;
142  }
143 
144  if (!flite_inited) {
145  if (flite_init() < 0) {
146  av_log(ctx, AV_LOG_ERROR, "flite initialization failed\n");
147  return AVERROR_UNKNOWN;
148  }
149  flite_inited++;
150  }
151 
152  if ((ret = select_voice(&flite->voice_entry, flite->voice_str, ctx)) < 0)
153  return ret;
154  flite->voice = flite->voice_entry->voice;
155 
156  if (flite->textfile && flite->text) {
157  av_log(ctx, AV_LOG_ERROR,
158  "Both text and textfile options set: only one must be specified\n");
159  return AVERROR(EINVAL);
160  }
161 
162  if (flite->textfile) {
163  uint8_t *textbuf;
164  size_t textbuf_size;
165 
166  if ((ret = av_file_map(flite->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
167  av_log(ctx, AV_LOG_ERROR,
168  "The text file '%s' could not be read: %s\n",
169  flite->textfile, av_err2str(ret));
170  return ret;
171  }
172 
173  if (!(flite->text = av_malloc(textbuf_size+1)))
174  return AVERROR(ENOMEM);
175  memcpy(flite->text, textbuf, textbuf_size);
176  flite->text[textbuf_size] = 0;
177  av_file_unmap(textbuf, textbuf_size);
178  }
179 
180  if (!flite->text) {
181  av_log(ctx, AV_LOG_ERROR,
182  "No speech text specified, specify the 'text' or 'textfile' option\n");
183  return AVERROR(EINVAL);
184  }
185 
186  /* synth all the file data in block */
187  flite->wave = flite_text_to_wave(flite->text, flite->voice);
188  flite->wave_samples = flite->wave->samples;
189  flite->wave_nb_samples = flite->wave->num_samples;
190  return 0;
191 }
192 
193 static av_cold void uninit(AVFilterContext *ctx)
194 {
195  FliteContext *flite = ctx->priv;
196 
197  if (!--flite->voice_entry->usage_count)
198  flite->voice_entry->unregister_fn(flite->voice);
199  flite->voice = NULL;
200  flite->voice_entry = NULL;
201  delete_wave(flite->wave);
202  flite->wave = NULL;
203 }
204 
206 {
207  FliteContext *flite = ctx->priv;
208 
209  AVFilterChannelLayouts *chlayouts = NULL;
210  int64_t chlayout = av_get_default_channel_layout(flite->wave->num_channels);
211  AVFilterFormats *sample_formats = NULL;
213 
214  ff_add_channel_layout(&chlayouts, chlayout);
215  ff_set_common_channel_layouts(ctx, chlayouts);
216  ff_add_format(&sample_formats, AV_SAMPLE_FMT_S16);
217  ff_set_common_formats(ctx, sample_formats);
218  ff_add_format(&sample_rates, flite->wave->sample_rate);
219  ff_set_common_samplerates (ctx, sample_rates);
220 
221  return 0;
222 }
223 
224 static int config_props(AVFilterLink *outlink)
225 {
226  AVFilterContext *ctx = outlink->src;
227  FliteContext *flite = ctx->priv;
228 
229  outlink->sample_rate = flite->wave->sample_rate;
230  outlink->time_base = (AVRational){1, flite->wave->sample_rate};
231 
232  av_log(ctx, AV_LOG_VERBOSE, "voice:%s fmt:%s sample_rate:%d\n",
233  flite->voice_str,
234  av_get_sample_fmt_name(outlink->format), outlink->sample_rate);
235  return 0;
236 }
237 
238 static int request_frame(AVFilterLink *outlink)
239 {
240  AVFrame *samplesref;
241  FliteContext *flite = outlink->src->priv;
242  int nb_samples = FFMIN(flite->wave_nb_samples, flite->frame_nb_samples);
243 
244  if (!nb_samples)
245  return AVERROR_EOF;
246 
247  samplesref = ff_get_audio_buffer(outlink, nb_samples);
248  if (!samplesref)
249  return AVERROR(ENOMEM);
250 
251  memcpy(samplesref->data[0], flite->wave_samples,
252  nb_samples * flite->wave->num_channels * 2);
253  samplesref->pts = flite->pts;
254  av_frame_set_pkt_pos(samplesref, -1);
255  av_frame_set_sample_rate(samplesref, flite->wave->sample_rate);
256  flite->pts += nb_samples;
257  flite->wave_samples += nb_samples * flite->wave->num_channels;
258  flite->wave_nb_samples -= nb_samples;
259 
260  return ff_filter_frame(outlink, samplesref);
261 }
262 
263 static const AVFilterPad flite_outputs[] = {
264  {
265  .name = "default",
266  .type = AVMEDIA_TYPE_AUDIO,
267  .config_props = config_props,
268  .request_frame = request_frame,
269  },
270  { NULL }
271 };
272 
274  .name = "flite",
275  .description = NULL_IF_CONFIG_SMALL("Synthesize voice from text using libflite."),
276  .query_formats = query_formats,
277  .init = init,
278  .uninit = uninit,
279  .priv_size = sizeof(FliteContext),
280  .inputs = NULL,
281  .outputs = flite_outputs,
282  .priv_class = &flite_class,
283 };