[libav.git] / libavfilter / af_resample.c

/*
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * sample format and channel layout conversion audio filter
 */

#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/common.h"
#include "libavutil/dict.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"

#include "libavresample/avresample.h"

#include "audio.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"

typedef struct ResampleContext {
    AVAudioResampleContext *avr;
    AVDictionary *options;

    int64_t next_pts;

    /* set by filter_frame() to signal an output frame to request_frame() */
    int got_output;
} ResampleContext;

static av_cold int init(AVFilterContext *ctx, const char *args)
{
    ResampleContext *s = ctx->priv;

    if (args) {
        int ret = av_dict_parse_string(&s->options, args, "=", ":", 0);
        if (ret < 0) {
            av_log(ctx, AV_LOG_ERROR, "error setting option string: %s\n", args);
            return ret;
        }

        /* do not allow the user to override basic format options */
        av_dict_set(&s->options,  "in_channel_layout", NULL, 0);
        av_dict_set(&s->options, "out_channel_layout", NULL, 0);
        av_dict_set(&s->options,  "in_sample_fmt",     NULL, 0);
        av_dict_set(&s->options, "out_sample_fmt",     NULL, 0);
        av_dict_set(&s->options,  "in_sample_rate",    NULL, 0);
        av_dict_set(&s->options, "out_sample_rate",    NULL, 0);
    }

    return 0;
}

static av_cold void uninit(AVFilterContext *ctx)
{
    ResampleContext *s = ctx->priv;

    if (s->avr) {
        avresample_close(s->avr);
        avresample_free(&s->avr);
    }
    av_dict_free(&s->options);
}

static int query_formats(AVFilterContext *ctx)
{
    AVFilterLink *inlink  = ctx->inputs[0];
    AVFilterLink *outlink = ctx->outputs[0];

    AVFilterFormats        *in_formats      = ff_all_formats(AVMEDIA_TYPE_AUDIO);
    AVFilterFormats        *out_formats     = ff_all_formats(AVMEDIA_TYPE_AUDIO);
    AVFilterFormats        *in_samplerates  = ff_all_samplerates();
    AVFilterFormats        *out_samplerates = ff_all_samplerates();
    AVFilterChannelLayouts *in_layouts      = ff_all_channel_layouts();
    AVFilterChannelLayouts *out_layouts     = ff_all_channel_layouts();

    ff_formats_ref(in_formats,  &inlink->out_formats);
    ff_formats_ref(out_formats, &outlink->in_formats);

    ff_formats_ref(in_samplerates,  &inlink->out_samplerates);
    ff_formats_ref(out_samplerates, &outlink->in_samplerates);

    ff_channel_layouts_ref(in_layouts,  &inlink->out_channel_layouts);
    ff_channel_layouts_ref(out_layouts, &outlink->in_channel_layouts);

    return 0;
}

static int config_output(AVFilterLink *outlink)
{
    AVFilterContext *ctx = outlink->src;
    AVFilterLink *inlink = ctx->inputs[0];
    ResampleContext   *s = ctx->priv;
    char buf1[64], buf2[64];
    int ret;

    if (s->avr) {
        avresample_close(s->avr);
        avresample_free(&s->avr);
    }

    if (inlink->channel_layout == outlink->channel_layout &&
        inlink->sample_rate    == outlink->sample_rate    &&
        (inlink->format        == outlink->format ||
        (av_get_channel_layout_nb_channels(inlink->channel_layout)  == 1 &&
         av_get_channel_layout_nb_channels(outlink->channel_layout) == 1 &&
         av_get_planar_sample_fmt(inlink->format) ==
         av_get_planar_sample_fmt(outlink->format))))
        return 0;

    if (!(s->avr = avresample_alloc_context()))
        return AVERROR(ENOMEM);

    if (s->options) {
        AVDictionaryEntry *e = NULL;
        while ((e = av_dict_get(s->options, "", e, AV_DICT_IGNORE_SUFFIX)))
            av_log(ctx, AV_LOG_VERBOSE, "lavr option: %s=%s\n", e->key, e->value);

        av_opt_set_dict(s->avr, &s->options);
    }

    av_opt_set_int(s->avr,  "in_channel_layout", inlink ->channel_layout, 0);
    av_opt_set_int(s->avr, "out_channel_layout", outlink->channel_layout, 0);
    av_opt_set_int(s->avr,  "in_sample_fmt",     inlink ->format,         0);
    av_opt_set_int(s->avr, "out_sample_fmt",     outlink->format,         0);
    av_opt_set_int(s->avr,  "in_sample_rate",    inlink ->sample_rate,    0);
    av_opt_set_int(s->avr, "out_sample_rate",    outlink->sample_rate,    0);

    if ((ret = avresample_open(s->avr)) < 0)
        return ret;

    outlink->time_base = (AVRational){ 1, outlink->sample_rate };
    s->next_pts        = AV_NOPTS_VALUE;

    av_get_channel_layout_string(buf1, sizeof(buf1),
                                 -1, inlink ->channel_layout);
    av_get_channel_layout_string(buf2, sizeof(buf2),
                                 -1, outlink->channel_layout);
    av_log(ctx, AV_LOG_VERBOSE,
           "fmt:%s srate:%d cl:%s -> fmt:%s srate:%d cl:%s\n",
           av_get_sample_fmt_name(inlink ->format), inlink ->sample_rate, buf1,
           av_get_sample_fmt_name(outlink->format), outlink->sample_rate, buf2);

    return 0;
}

static int request_frame(AVFilterLink *outlink)
{
    AVFilterContext *ctx = outlink->src;
    ResampleContext   *s = ctx->priv;
    int ret = 0;

    s->got_output = 0;
    while (ret >= 0 && !s->got_output)
        ret = ff_request_frame(ctx->inputs[0]);

    /* flush the lavr delay buffer */
    if (ret == AVERROR_EOF && s->avr) {
        AVFilterBufferRef *buf;
        int nb_samples = av_rescale_rnd(avresample_get_delay(s->avr),
                                        outlink->sample_rate,
                                        ctx->inputs[0]->sample_rate,
                                        AV_ROUND_UP);

        if (!nb_samples)
            return ret;

        buf = ff_get_audio_buffer(outlink, AV_PERM_WRITE, nb_samples);
        if (!buf)
            return AVERROR(ENOMEM);

        ret = avresample_convert(s->avr, buf->extended_data,
                                 buf->linesize[0], nb_samples,
                                 NULL, 0, 0);
        if (ret <= 0) {
            avfilter_unref_buffer(buf);
            return (ret == 0) ? AVERROR_EOF : ret;
        }

        buf->pts = s->next_pts;
        return ff_filter_frame(outlink, buf);
    }
    return ret;
}

static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *buf)
{
    AVFilterContext  *ctx = inlink->dst;
    ResampleContext    *s = ctx->priv;
    AVFilterLink *outlink = ctx->outputs[0];
    int ret;

    if (s->avr) {
        AVFilterBufferRef *buf_out;
        int delay, nb_samples;

        /* maximum possible samples lavr can output */
        delay      = avresample_get_delay(s->avr);
        nb_samples = av_rescale_rnd(buf->audio->nb_samples + delay,
                                    outlink->sample_rate, inlink->sample_rate,
                                    AV_ROUND_UP);

        buf_out = ff_get_audio_buffer(outlink, AV_PERM_WRITE, nb_samples);
        if (!buf_out) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }

        ret     = avresample_convert(s->avr, buf_out->extended_data,
                                     buf_out->linesize[0], nb_samples,
                                     buf->extended_data, buf->linesize[0],
                                     buf->audio->nb_samples);
        if (ret <= 0) {
            avfilter_unref_buffer(buf_out);
            if (ret < 0)
                goto fail;
        }

        av_assert0(!avresample_available(s->avr));

        if (s->next_pts == AV_NOPTS_VALUE) {
            if (buf->pts == AV_NOPTS_VALUE) {
                av_log(ctx, AV_LOG_WARNING, "First timestamp is missing, "
                       "assuming 0.\n");
                s->next_pts = 0;
            } else
                s->next_pts = av_rescale_q(buf->pts, inlink->time_base,
                                           outlink->time_base);
        }

        if (ret > 0) {
            buf_out->audio->nb_samples = ret;
            if (buf->pts != AV_NOPTS_VALUE) {
                buf_out->pts = av_rescale_q(buf->pts, inlink->time_base,
                                            outlink->time_base) -
                               av_rescale(delay, outlink->sample_rate,
                                          inlink->sample_rate);
            } else
                buf_out->pts = s->next_pts;

            s->next_pts = buf_out->pts + buf_out->audio->nb_samples;

            ret = ff_filter_frame(outlink, buf_out);
            s->got_output = 1;
        }

fail:
        avfilter_unref_buffer(buf);
    } else {
        buf->format = outlink->format;
        ret = ff_filter_frame(outlink, buf);
        s->got_output = 1;
    }

    return ret;
}

static const AVFilterPad avfilter_af_resample_inputs[] = {
    {
        .name           = "default",
        .type           = AVMEDIA_TYPE_AUDIO,
        .filter_frame   = filter_frame,
        .min_perms      = AV_PERM_READ
    },
    { NULL }
};

static const AVFilterPad avfilter_af_resample_outputs[] = {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_AUDIO,
        .config_props  = config_output,
        .request_frame = request_frame
    },
    { NULL }
};

AVFilter avfilter_af_resample = {
    .name          = "resample",
    .description   = NULL_IF_CONFIG_SMALL("Audio resampling and conversion."),
    .priv_size     = sizeof(ResampleContext),

    .init           = init,
    .uninit         = uninit,
    .query_formats  = query_formats,

    .inputs    = avfilter_af_resample_inputs,
    .outputs   = avfilter_af_resample_outputs,
};
Commit	Line	Data
d371e7b9 AK	1	/*
	2	*
	3	* This file is part of Libav.
	4	*
	5	* Libav is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU Lesser General Public
	7	* License as published by the Free Software Foundation; either
	8	* version 2.1 of the License, or (at your option) any later version.
	9	*
	10	* Libav is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	* Lesser General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU Lesser General Public
	16	* License along with Libav; if not, write to the Free Software
	17	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	18	*/
	19
	20	/**
	21	* @file
	22	* sample format and channel layout conversion audio filter
	23	*/
	24
	25	#include "libavutil/avassert.h"
	26	#include "libavutil/avstring.h"
1d9c2dc8	27	#include "libavutil/common.h"
9f122356	28	#include "libavutil/dict.h"
d371e7b9 AK	29	#include "libavutil/mathematics.h"
	30	#include "libavutil/opt.h"
	31
	32	#include "libavresample/avresample.h"
	33
	34	#include "audio.h"
	35	#include "avfilter.h"
ff1f51a8	36	#include "formats.h"
d371e7b9 AK	37	#include "internal.h"
	38
	39	typedef struct ResampleContext {
	40	AVAudioResampleContext *avr;
9f122356	41	AVDictionary *options;
d371e7b9 AK	42
d371e7b9 AK	43	int64_t next_pts;
1ffb6456	44
565e4993	45	/* set by filter_frame() to signal an output frame to request_frame() */
1ffb6456	46	int got_output;
d371e7b9 AK	47	} ResampleContext;
d371e7b9 AK	48
9f122356 JR	49	static av_cold int init(AVFilterContext ctx, const char args)
	50	{
	51	ResampleContext *s = ctx->priv;
	52
	53	if (args) {
	54	int ret = av_dict_parse_string(&s->options, args, "=", ":", 0);
	55	if (ret < 0) {
	56	av_log(ctx, AV_LOG_ERROR, "error setting option string: %s\n", args);
	57	return ret;
	58	}
	59
	60	/* do not allow the user to override basic format options */
	61	av_dict_set(&s->options, "in_channel_layout", NULL, 0);
	62	av_dict_set(&s->options, "out_channel_layout", NULL, 0);
	63	av_dict_set(&s->options, "in_sample_fmt", NULL, 0);
	64	av_dict_set(&s->options, "out_sample_fmt", NULL, 0);
	65	av_dict_set(&s->options, "in_sample_rate", NULL, 0);
	66	av_dict_set(&s->options, "out_sample_rate", NULL, 0);
	67	}
	68
	69	return 0;
	70	}
	71
d371e7b9 AK	72	static av_cold void uninit(AVFilterContext *ctx)
	73	{
	74	ResampleContext *s = ctx->priv;
	75
	76	if (s->avr) {
	77	avresample_close(s->avr);
	78	avresample_free(&s->avr);
	79	}
9f122356	80	av_dict_free(&s->options);
d371e7b9 AK	81	}
	82
	83	static int query_formats(AVFilterContext *ctx)
	84	{
	85	AVFilterLink *inlink = ctx->inputs[0];
	86	AVFilterLink *outlink = ctx->outputs[0];
	87
b74a1da4 AK	88	AVFilterFormats *in_formats = ff_all_formats(AVMEDIA_TYPE_AUDIO);
b74a1da4 AK	89	AVFilterFormats *out_formats = ff_all_formats(AVMEDIA_TYPE_AUDIO);
ff1f51a8 AK	90	AVFilterFormats *in_samplerates = ff_all_samplerates();
	91	AVFilterFormats *out_samplerates = ff_all_samplerates();
	92	AVFilterChannelLayouts *in_layouts = ff_all_channel_layouts();
	93	AVFilterChannelLayouts *out_layouts = ff_all_channel_layouts();
d371e7b9	94
b74a1da4 AK	95	ff_formats_ref(in_formats, &inlink->out_formats);
b74a1da4 AK	96	ff_formats_ref(out_formats, &outlink->in_formats);
d371e7b9	97
b74a1da4 AK	98	ff_formats_ref(in_samplerates, &inlink->out_samplerates);
b74a1da4 AK	99	ff_formats_ref(out_samplerates, &outlink->in_samplerates);
ff1f51a8 AK	100
	101	ff_channel_layouts_ref(in_layouts, &inlink->out_channel_layouts);
	102	ff_channel_layouts_ref(out_layouts, &outlink->in_channel_layouts);
	103
d371e7b9 AK	104	return 0;
	105	}
	106
	107	static int config_output(AVFilterLink *outlink)
	108	{
	109	AVFilterContext *ctx = outlink->src;
	110	AVFilterLink *inlink = ctx->inputs[0];
	111	ResampleContext *s = ctx->priv;
	112	char buf1[64], buf2[64];
	113	int ret;
	114
	115	if (s->avr) {
	116	avresample_close(s->avr);
	117	avresample_free(&s->avr);
	118	}
	119
	120	if (inlink->channel_layout == outlink->channel_layout &&
	121	inlink->sample_rate == outlink->sample_rate &&
7b556be6 JR	122	(inlink->format == outlink->format \|\|
	123	(av_get_channel_layout_nb_channels(inlink->channel_layout) == 1 &&
	124	av_get_channel_layout_nb_channels(outlink->channel_layout) == 1 &&
	125	av_get_planar_sample_fmt(inlink->format) ==
	126	av_get_planar_sample_fmt(outlink->format))))
d371e7b9 AK	127	return 0;
	128
	129	if (!(s->avr = avresample_alloc_context()))
	130	return AVERROR(ENOMEM);
	131
9f122356 JR	132	if (s->options) {
	133	AVDictionaryEntry *e = NULL;
	134	while ((e = av_dict_get(s->options, "", e, AV_DICT_IGNORE_SUFFIX)))
	135	av_log(ctx, AV_LOG_VERBOSE, "lavr option: %s=%s\n", e->key, e->value);
	136
	137	av_opt_set_dict(s->avr, &s->options);
	138	}
	139
d371e7b9 AK	140	av_opt_set_int(s->avr, "in_channel_layout", inlink ->channel_layout, 0);
	141	av_opt_set_int(s->avr, "out_channel_layout", outlink->channel_layout, 0);
	142	av_opt_set_int(s->avr, "in_sample_fmt", inlink ->format, 0);
	143	av_opt_set_int(s->avr, "out_sample_fmt", outlink->format, 0);
	144	av_opt_set_int(s->avr, "in_sample_rate", inlink ->sample_rate, 0);
	145	av_opt_set_int(s->avr, "out_sample_rate", outlink->sample_rate, 0);
	146
d371e7b9 AK	147	if ((ret = avresample_open(s->avr)) < 0)
	148	return ret;
	149
	150	outlink->time_base = (AVRational){ 1, outlink->sample_rate };
	151	s->next_pts = AV_NOPTS_VALUE;
	152
	153	av_get_channel_layout_string(buf1, sizeof(buf1),
	154	-1, inlink ->channel_layout);
	155	av_get_channel_layout_string(buf2, sizeof(buf2),
	156	-1, outlink->channel_layout);
	157	av_log(ctx, AV_LOG_VERBOSE,
e0d8427d	158	"fmt:%s srate:%d cl:%s -> fmt:%s srate:%d cl:%s\n",
d371e7b9 AK	159	av_get_sample_fmt_name(inlink ->format), inlink ->sample_rate, buf1,
	160	av_get_sample_fmt_name(outlink->format), outlink->sample_rate, buf2);
	161
	162	return 0;
	163	}
	164
	165	static int request_frame(AVFilterLink *outlink)
	166	{
	167	AVFilterContext *ctx = outlink->src;
	168	ResampleContext *s = ctx->priv;
1ffb6456 AK	169	int ret = 0;
	170
	171	s->got_output = 0;
	172	while (ret >= 0 && !s->got_output)
	173	ret = ff_request_frame(ctx->inputs[0]);
d371e7b9 AK	174
	175	/* flush the lavr delay buffer */
	176	if (ret == AVERROR_EOF && s->avr) {
	177	AVFilterBufferRef *buf;
	178	int nb_samples = av_rescale_rnd(avresample_get_delay(s->avr),
	179	outlink->sample_rate,
	180	ctx->inputs[0]->sample_rate,
	181	AV_ROUND_UP);
	182
	183	if (!nb_samples)
	184	return ret;
	185
	186	buf = ff_get_audio_buffer(outlink, AV_PERM_WRITE, nb_samples);
	187	if (!buf)
	188	return AVERROR(ENOMEM);
	189
e7ba5b1d	190	ret = avresample_convert(s->avr, buf->extended_data,
d371e7b9 AK	191	buf->linesize[0], nb_samples,
	192	NULL, 0, 0);
	193	if (ret <= 0) {
	194	avfilter_unref_buffer(buf);
	195	return (ret == 0) ? AVERROR_EOF : ret;
	196	}
	197
	198	buf->pts = s->next_pts;
565e4993	199	return ff_filter_frame(outlink, buf);
d371e7b9 AK	200	}
	201	return ret;
	202	}
	203
565e4993	204	static int filter_frame(AVFilterLink inlink, AVFilterBufferRef buf)
d371e7b9 AK	205	{
	206	AVFilterContext *ctx = inlink->dst;
	207	ResampleContext *s = ctx->priv;
	208	AVFilterLink *outlink = ctx->outputs[0];
cd991462	209	int ret;
d371e7b9 AK	210
	211	if (s->avr) {
	212	AVFilterBufferRef *buf_out;
cd991462	213	int delay, nb_samples;
d371e7b9 AK	214
	215	/* maximum possible samples lavr can output */
	216	delay = avresample_get_delay(s->avr);
	217	nb_samples = av_rescale_rnd(buf->audio->nb_samples + delay,
	218	outlink->sample_rate, inlink->sample_rate,
	219	AV_ROUND_UP);
	220
	221	buf_out = ff_get_audio_buffer(outlink, AV_PERM_WRITE, nb_samples);
cd991462 AK	222	if (!buf_out) {
	223	ret = AVERROR(ENOMEM);
	224	goto fail;
	225	}
	226
e7ba5b1d	227	ret = avresample_convert(s->avr, buf_out->extended_data,
d371e7b9	228	buf_out->linesize[0], nb_samples,
e7ba5b1d	229	buf->extended_data, buf->linesize[0],
d371e7b9	230	buf->audio->nb_samples);
ac9a8956	231	if (ret <= 0) {
cd991462	232	avfilter_unref_buffer(buf_out);
ac9a8956 JG	233	if (ret < 0)
ac9a8956 JG	234	goto fail;
cd991462	235	}
d371e7b9 AK	236
	237	av_assert0(!avresample_available(s->avr));
	238
	239	if (s->next_pts == AV_NOPTS_VALUE) {
	240	if (buf->pts == AV_NOPTS_VALUE) {
	241	av_log(ctx, AV_LOG_WARNING, "First timestamp is missing, "
	242	"assuming 0.\n");
	243	s->next_pts = 0;
	244	} else
	245	s->next_pts = av_rescale_q(buf->pts, inlink->time_base,
	246	outlink->time_base);
	247	}
	248
	249	if (ret > 0) {
	250	buf_out->audio->nb_samples = ret;
	251	if (buf->pts != AV_NOPTS_VALUE) {
	252	buf_out->pts = av_rescale_q(buf->pts, inlink->time_base,
	253	outlink->time_base) -
	254	av_rescale(delay, outlink->sample_rate,
	255	inlink->sample_rate);
	256	} else
	257	buf_out->pts = s->next_pts;
	258
	259	s->next_pts = buf_out->pts + buf_out->audio->nb_samples;
	260
565e4993	261	ret = ff_filter_frame(outlink, buf_out);
1ffb6456	262	s->got_output = 1;
d371e7b9	263	}
cd991462 AK	264
cd991462 AK	265	fail:
d371e7b9	266	avfilter_unref_buffer(buf);
1ffb6456	267	} else {
7b556be6	268	buf->format = outlink->format;
565e4993	269	ret = ff_filter_frame(outlink, buf);
1ffb6456 AK	270	s->got_output = 1;
1ffb6456 AK	271	}
cd991462 AK	272
cd991462 AK	273	return ret;
d371e7b9 AK	274	}
d371e7b9 AK	275
568c70e7 MR	276	static const AVFilterPad avfilter_af_resample_inputs[] = {
	277	{
	278	.name = "default",
	279	.type = AVMEDIA_TYPE_AUDIO,
565e4993	280	.filter_frame = filter_frame,
568c70e7 MR	281	.min_perms = AV_PERM_READ
	282	},
	283	{ NULL }
	284	};
	285
	286	static const AVFilterPad avfilter_af_resample_outputs[] = {
	287	{
	288	.name = "default",
	289	.type = AVMEDIA_TYPE_AUDIO,
	290	.config_props = config_output,
	291	.request_frame = request_frame
	292	},
	293	{ NULL }
	294	};
	295
d371e7b9 AK	296	AVFilter avfilter_af_resample = {
	297	.name = "resample",
	298	.description = NULL_IF_CONFIG_SMALL("Audio resampling and conversion."),
	299	.priv_size = sizeof(ResampleContext),
	300
9f122356	301	.init = init,
d371e7b9 AK	302	.uninit = uninit,
	303	.query_formats = query_formats,
	304
568c70e7 MR	305	.inputs = avfilter_af_resample_inputs,
568c70e7 MR	306	.outputs = avfilter_af_resample_outputs,
d371e7b9	307	};