lavfi: add flite audio source

Changelog

@@ -37,6 +37,7 @@ version next:
 - caca output device using libcaca
 - alphaextract and alphamerge filters
 - concat filter
+- flite filter
 
 
 version 0.11:

configure

@@ -180,6 +180,7 @@ External library support:
                            and libraw1394 [no]
   --enable-libfaac         enable AAC encoding via libfaac [no]
   --enable-libfdk-aac      enable AAC encoding via libfdk-aac [no]
+  --enable-libflite        enable flite (voice synthesis) support via libflite [no]
   --enable-libfreetype     enable libfreetype [no]
   --enable-libgsm          enable GSM de/encoding via libgsm [no]
   --enable-libiec61883     enable iec61883 via libiec61883 [no]
@@ -1074,6 +1075,7 @@ CONFIG_LIST="
     libdc1394
     libfaac
     libfdk_aac
+    libflite
     libfreetype
     libgsm
     libiec61883
@@ -1787,6 +1789,7 @@ cropdetect_filter_deps="gpl"
 delogo_filter_deps="gpl"
 deshake_filter_deps="avcodec"
 drawtext_filter_deps="libfreetype"
+flite_filter_deps="libflite"
 frei0r_filter_deps="frei0r dlopen"
 frei0r_filter_extralibs='$ldl'
 frei0r_src_filter_deps="frei0r dlopen"
@@ -3390,6 +3393,8 @@ enabled libcelt    && require libcelt celt/celt.h celt_decode -lcelt0 &&
 enabled libcaca    && require_pkg_config caca caca.h caca_create_canvas
 enabled libfaac    && require2 libfaac "stdint.h faac.h" faacEncGetVersion -lfaac
 enabled libfdk_aac && require  libfdk_aac fdk-aac/aacenc_lib.h aacEncOpen -lfdk-aac
+flite_libs="-lflite_cmu_time_awb -lflite_cmu_us_awb -lflite_cmu_us_kal -lflite_cmu_us_kal16 -lflite_cmu_us_rms -lflite_cmu_us_slt -lflite_usenglish -lflite_cmulex -lflite"
+enabled libflite   && require2 libflite "flite/flite.h" flite_init $flite_libs
 enabled libfreetype && require_pkg_config freetype2 "ft2build.h freetype/freetype.h" FT_Init_FreeType
 enabled libgsm     && require  libgsm gsm/gsm.h gsm_create -lgsm
 enabled libilbc    && require  libilbc ilbc.h WebRtcIlbcfix_InitDecode -lilbc

doc/filters.texi

@@ -1026,6 +1026,65 @@ Channel layout of the audio data, in the form that can be accepted by
 
 All the parameters need to be explicitly defined.
 
+@section flite
+
+Synthesize a voice utterance using the libflite library.
+
+To enable compilation of this filter you need to configure FFmpeg with
+@code{--enable-libflite}.
+
+The source accepts parameters as a list of @var{key}=@var{value} pairs,
+separated by ":".
+
+The description of the accepted parameters follows.
+
+@table @option
+
+@item list_voices
+If set to 1, list the names of the available voices and exit
+immediately. Default value is 0.
+
+@item nb_samples, n
+Set the maximum number of samples per frame. Default value is 512.
+
+@item textfile
+Set the filename containing the text to speak.
+
+@item text
+Set the text to speak.
+
+@item voice, v
+Set the voice to use for the speech synthesis. Default value is
+@code{kal}. See also the @var{list_voices} option.
+@end table
+
+@section Examples
+
+@itemize
+@item
+Read from file @file{speech.txt}, and synthetize the text using the
+standard flite voice:
+@example
+flite=textfile=speech.txt
+@end example
+
+@item
+Read the specified text selecting the @code{slt} voice:
+@example
+flite=text='So fare thee well, poor devil of a Sub-Sub, whose commentator I am':voice=slt
+@end example
+
+@item
+Make @file{ffplay} speech the specified text, using @code{flite} and
+the @code{lavfi} device:
+@example
+ffplay -f lavfi flite='No more be grieved for which that thou hast done.'
+@end example
+@end itemize
+
+For more information about libflite, check:
+@url{http://www.speech.cs.cmu.edu/flite/}
+
 @c man end AUDIO SOURCES
 
 @chapter Audio Sinks

libavfilter/Makefile

@@ -70,6 +70,7 @@ OBJS-$(CONFIG_VOLUME_FILTER)                 += af_volume.o
 
 OBJS-$(CONFIG_AEVALSRC_FILTER)               += asrc_aevalsrc.o
 OBJS-$(CONFIG_ANULLSRC_FILTER)               += asrc_anullsrc.o
+OBJS-$(CONFIG_FLITE_FILTER)                  += asrc_flite.o
 
 OBJS-$(CONFIG_ABUFFERSINK_FILTER)            += sink_buffer.o
 OBJS-$(CONFIG_ANULLSINK_FILTER)              += asink_anullsink.o

libavfilter/allfilters.c

@@ -59,6 +59,7 @@ void avfilter_register_all(void)
 
     REGISTER_FILTER (AEVALSRC,    aevalsrc,    asrc);
     REGISTER_FILTER (ANULLSRC,    anullsrc,    asrc);
+    REGISTER_FILTER (FLITE,       flite,       asrc);
 
     REGISTER_FILTER (ABUFFERSINK, abuffersink, asink);
     REGISTER_FILTER (ANULLSINK,   anullsink,   asink);

libavfilter/asrc_flite.c

+/*
+ * 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/audioconvert.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;
+    int64_t pts;
+    int frame_nb_samples; ///< number of samples per frame
+} FliteContext;
+
+#define OFFSET(x) offsetof(FliteContext, x)
+
+static const AVOption flite_options[] = {
+    { "list_voices", "list voices and exit",              OFFSET(list_voices), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1 },
+    { "nb_samples",  "set number of samples per frame",   OFFSET(frame_nb_samples), AV_OPT_TYPE_INT, {.dbl=512}, 0, INT_MAX },
+    { "n",           "set number of samples per frame",   OFFSET(frame_nb_samples), AV_OPT_TYPE_INT, {.dbl=512}, 0, INT_MAX },
+    { "text",        "set text to speak",                 OFFSET(text),      AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
+    { "textfile",    "set filename of the text to speak", OFFSET(textfile),  AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
+    { "v",           "set voice",                         OFFSET(voice_str), AV_OPT_TYPE_STRING, {.str="kal"}, CHAR_MIN, CHAR_MAX },
+    { "voice",       "set voice",                         OFFSET(voice_str), AV_OPT_TYPE_STRING, {.str="kal"}, CHAR_MIN, CHAR_MAX },
+    { 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 *)
+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 *);
+} voice_entry;
+
+static struct voice_entry voice_entries[] = {
+    { "awb",   register_cmu_us_awb },
+    { "kal",   register_cmu_us_kal },
+    { "kal16", register_cmu_us_kal16 },
+    { "rms",   register_cmu_us_rms },
+    { "slt",   register_cmu_us_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(cst_voice **voice, 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)) {
+            *voice = entry->register_fn(NULL);
+            if (!*voice) {
+                av_log(log_ctx, AV_LOG_ERROR,
+                       "Could not register voice '%s'\n", voice_name);
+                return AVERROR_UNKNOWN;
+            }
+            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, const char *args)
+{
+    FliteContext *flite = ctx->priv;
+    int ret = 0;
+
+    flite->class = &flite_class;
+    av_opt_set_defaults(flite);
+
+    if ((ret = av_set_options_string(flite, args, "=", ":")) < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
+        return ret;
+    }
+
+    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, flite->voice_str, ctx)) < 0)
+        return ret;
+
+    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;
+
+    av_opt_free(flite);
+
+    delete_voice(flite->voice);
+    flite->voice = 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)
+{
+    AVFilterBufferRef *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, AV_PERM_WRITE, 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;
+    samplesref->pos = -1;
+    samplesref->audio->sample_rate = 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_samples(outlink, samplesref);
+}
+
+AVFilter avfilter_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 = (const AVFilterPad[]) {{ .name = NULL}},
+
+    .outputs = (const AVFilterPad[]) {
+        {
+            .name = "default",
+            .type = AVMEDIA_TYPE_AUDIO,
+            .config_props = config_props,
+            .request_frame = request_frame,
+        },
+        { .name = NULL }
+    },
+};

libavfilter/version.h

@@ -29,7 +29,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  3
-#define LIBAVFILTER_VERSION_MINOR  3
+#define LIBAVFILTER_VERSION_MINOR  4
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \