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FFmpeg/libavfilter/asrc_flite.c

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/*
* Copyright (c) 2012 Stefano Sabatini
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* flite voice synth source
*/
#include <flite/flite.h>
#include "libavutil/channel_layout.h"
#include "libavutil/file.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "audio.h"
#include "formats.h"
#include "internal.h"
typedef struct {
const AVClass *class;
char *voice_str;
char *textfile;
char *text;
cst_wave *wave;
int16_t *wave_samples;
int wave_nb_samples;
int list_voices;
cst_voice *voice;
struct voice_entry *voice_entry;
int64_t pts;
int frame_nb_samples; ///< number of samples per frame
} FliteContext;
#define OFFSET(x) offsetof(FliteContext, x)
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption flite_options[] = {
{ "list_voices", "list voices and exit", OFFSET(list_voices), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ "nb_samples", "set number of samples per frame", OFFSET(frame_nb_samples), AV_OPT_TYPE_INT, {.i64=512}, 0, INT_MAX, FLAGS },
{ "n", "set number of samples per frame", OFFSET(frame_nb_samples), AV_OPT_TYPE_INT, {.i64=512}, 0, INT_MAX, FLAGS },
{ "text", "set text to speak", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
{ "textfile", "set filename of the text to speak", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
{ "v", "set voice", OFFSET(voice_str), AV_OPT_TYPE_STRING, {.str="kal"}, CHAR_MIN, CHAR_MAX, FLAGS },
{ "voice", "set voice", OFFSET(voice_str), AV_OPT_TYPE_STRING, {.str="kal"}, CHAR_MIN, CHAR_MAX, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(flite);
static volatile int flite_inited = 0;
/* declare functions for all the supported voices */
#define DECLARE_REGISTER_VOICE_FN(name) \
cst_voice *register_cmu_us_## name(const char *); \
void unregister_cmu_us_## name(cst_voice *);
DECLARE_REGISTER_VOICE_FN(awb);
DECLARE_REGISTER_VOICE_FN(kal);
DECLARE_REGISTER_VOICE_FN(kal16);
DECLARE_REGISTER_VOICE_FN(rms);
DECLARE_REGISTER_VOICE_FN(slt);
struct voice_entry {
const char *name;
cst_voice * (*register_fn)(const char *);
void (*unregister_fn)(cst_voice *);
cst_voice *voice;
unsigned usage_count;
} voice_entry;
#define MAKE_VOICE_STRUCTURE(voice_name) { \
.name = #voice_name, \
.register_fn = register_cmu_us_ ## voice_name, \
.unregister_fn = unregister_cmu_us_ ## voice_name, \
}
static struct voice_entry voice_entries[] = {
MAKE_VOICE_STRUCTURE(awb),
MAKE_VOICE_STRUCTURE(kal),
MAKE_VOICE_STRUCTURE(kal16),
MAKE_VOICE_STRUCTURE(rms),
MAKE_VOICE_STRUCTURE(slt),
};
static void list_voices(void *log_ctx, const char *sep)
{
int i, n = FF_ARRAY_ELEMS(voice_entries);
for (i = 0; i < n; i++)
av_log(log_ctx, AV_LOG_INFO, "%s%s",
voice_entries[i].name, i < (n-1) ? sep : "\n");
}
static int select_voice(struct voice_entry **entry_ret, const char *voice_name, void *log_ctx)
{
int i;
for (i = 0; i < FF_ARRAY_ELEMS(voice_entries); i++) {
struct voice_entry *entry = &voice_entries[i];
if (!strcmp(entry->name, voice_name)) {
if (!entry->voice)
entry->voice = entry->register_fn(NULL);
if (!entry->voice) {
av_log(log_ctx, AV_LOG_ERROR,
"Could not register voice '%s'\n", voice_name);
return AVERROR_UNKNOWN;
}
entry->usage_count++;
*entry_ret = entry;
return 0;
}
}
av_log(log_ctx, AV_LOG_ERROR, "Could not find voice '%s'\n", voice_name);
av_log(log_ctx, AV_LOG_INFO, "Choose between the voices: ");
list_voices(log_ctx, ", ");
return AVERROR(EINVAL);
}
static av_cold int init(AVFilterContext *ctx)
{
FliteContext *flite = ctx->priv;
int ret = 0;
if (flite->list_voices) {
list_voices(ctx, "\n");
return AVERROR_EXIT;
}
if (!flite_inited) {
if (flite_init() < 0) {
av_log(ctx, AV_LOG_ERROR, "flite initialization failed\n");
return AVERROR_UNKNOWN;
}
flite_inited++;
}
if ((ret = select_voice(&flite->voice_entry, flite->voice_str, ctx)) < 0)
return ret;
flite->voice = flite->voice_entry->voice;
if (flite->textfile && flite->text) {
av_log(ctx, AV_LOG_ERROR,
"Both text and textfile options set: only one must be specified\n");
return AVERROR(EINVAL);
}
if (flite->textfile) {
uint8_t *textbuf;
size_t textbuf_size;
if ((ret = av_file_map(flite->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
av_log(ctx, AV_LOG_ERROR,
"The text file '%s' could not be read: %s\n",
flite->textfile, av_err2str(ret));
return ret;
}
if (!(flite->text = av_malloc(textbuf_size+1)))
return AVERROR(ENOMEM);
memcpy(flite->text, textbuf, textbuf_size);
flite->text[textbuf_size] = 0;
av_file_unmap(textbuf, textbuf_size);
}
if (!flite->text) {
av_log(ctx, AV_LOG_ERROR,
"No speech text specified, specify the 'text' or 'textfile' option\n");
return AVERROR(EINVAL);
}
/* synth all the file data in block */
flite->wave = flite_text_to_wave(flite->text, flite->voice);
flite->wave_samples = flite->wave->samples;
flite->wave_nb_samples = flite->wave->num_samples;
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
FliteContext *flite = ctx->priv;
if (!--flite->voice_entry->usage_count)
flite->voice_entry->unregister_fn(flite->voice);
flite->voice = NULL;
flite->voice_entry = NULL;
delete_wave(flite->wave);
flite->wave = NULL;
}
static int query_formats(AVFilterContext *ctx)
{
FliteContext *flite = ctx->priv;
AVFilterChannelLayouts *chlayouts = NULL;
int64_t chlayout = av_get_default_channel_layout(flite->wave->num_channels);
AVFilterFormats *sample_formats = NULL;
AVFilterFormats *sample_rates = NULL;
ff_add_channel_layout(&chlayouts, chlayout);
ff_set_common_channel_layouts(ctx, chlayouts);
ff_add_format(&sample_formats, AV_SAMPLE_FMT_S16);
ff_set_common_formats(ctx, sample_formats);
ff_add_format(&sample_rates, flite->wave->sample_rate);
ff_set_common_samplerates (ctx, sample_rates);
return 0;
}
static int config_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
FliteContext *flite = ctx->priv;
outlink->sample_rate = flite->wave->sample_rate;
outlink->time_base = (AVRational){1, flite->wave->sample_rate};
av_log(ctx, AV_LOG_VERBOSE, "voice:%s fmt:%s sample_rate:%d\n",
flite->voice_str,
av_get_sample_fmt_name(outlink->format), outlink->sample_rate);
return 0;
}
static int request_frame(AVFilterLink *outlink)
{
AVFrame *samplesref;
FliteContext *flite = outlink->src->priv;
int nb_samples = FFMIN(flite->wave_nb_samples, flite->frame_nb_samples);
if (!nb_samples)
return AVERROR_EOF;
samplesref = ff_get_audio_buffer(outlink, nb_samples);
if (!samplesref)
return AVERROR(ENOMEM);
memcpy(samplesref->data[0], flite->wave_samples,
nb_samples * flite->wave->num_channels * 2);
samplesref->pts = flite->pts;
av_frame_set_pkt_pos(samplesref, -1);
av_frame_set_sample_rate(samplesref, flite->wave->sample_rate);
flite->pts += nb_samples;
flite->wave_samples += nb_samples * flite->wave->num_channels;
flite->wave_nb_samples -= nb_samples;
return ff_filter_frame(outlink, samplesref);
}
static const AVFilterPad flite_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_props,
.request_frame = request_frame,
},
{ NULL }
};
AVFilter ff_asrc_flite = {
.name = "flite",
.description = NULL_IF_CONFIG_SMALL("Synthesize voice from text using libflite."),
.query_formats = query_formats,
.init = init,
.uninit = uninit,
.priv_size = sizeof(FliteContext),
.inputs = NULL,
.outputs = flite_outputs,
.priv_class = &flite_class,
};
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