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FFmpeg/libavfilter/f_loop.c
Paul B Mahol 315a4496ea avfilter/f_loop: switch aloop to activate
2019-11-17 16:20:58 +01:00

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/*
* Copyright (c) 2016 Paul B Mahol
*
* 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
*/
#include "libavutil/audio_fifo.h"
#include "libavutil/avassert.h"
#include "libavutil/fifo.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "audio.h"
#include "filters.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct LoopContext {
const AVClass *class;
AVAudioFifo *fifo;
AVAudioFifo *left;
AVFrame **frames;
int nb_frames;
int current_frame;
int64_t start_pts;
int64_t duration;
int64_t current_sample;
int64_t nb_samples;
int64_t ignored_samples;
int loop;
int eof;
int64_t size;
int64_t start;
int64_t pts;
} LoopContext;
#define AFLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define VFLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define OFFSET(x) offsetof(LoopContext, x)
static void check_size(AVFilterContext *ctx)
{
LoopContext *s = ctx->priv;
if (!s->size)
av_log(ctx, AV_LOG_WARNING, "Number of %s to loop is not set!\n",
ctx->input_pads[0].type == AVMEDIA_TYPE_VIDEO ? "frames" : "samples");
}
#if CONFIG_ALOOP_FILTER
static int aconfig_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
LoopContext *s = ctx->priv;
s->fifo = av_audio_fifo_alloc(inlink->format, inlink->channels, 8192);
s->left = av_audio_fifo_alloc(inlink->format, inlink->channels, 8192);
if (!s->fifo || !s->left)
return AVERROR(ENOMEM);
check_size(ctx);
return 0;
}
static av_cold void auninit(AVFilterContext *ctx)
{
LoopContext *s = ctx->priv;
av_audio_fifo_free(s->fifo);
av_audio_fifo_free(s->left);
}
static int push_samples(AVFilterContext *ctx, int nb_samples)
{
AVFilterLink *outlink = ctx->outputs[0];
LoopContext *s = ctx->priv;
AVFrame *out;
int ret, i = 0;
while (s->loop != 0 && i < nb_samples) {
out = ff_get_audio_buffer(outlink, FFMIN(nb_samples, s->nb_samples - s->current_sample));
if (!out)
return AVERROR(ENOMEM);
ret = av_audio_fifo_peek_at(s->fifo, (void **)out->extended_data, out->nb_samples, s->current_sample);
if (ret < 0) {
av_frame_free(&out);
return ret;
}
out->pts = s->pts;
out->nb_samples = ret;
s->pts += av_rescale_q(out->nb_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
i += out->nb_samples;
s->current_sample += out->nb_samples;
ret = ff_filter_frame(outlink, out);
if (ret < 0)
return ret;
if (s->current_sample >= s->nb_samples) {
s->duration = s->pts;
s->current_sample = 0;
if (s->loop > 0)
s->loop--;
}
}
return ret;
}
static int afilter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
LoopContext *s = ctx->priv;
int ret = 0;
if (s->ignored_samples + frame->nb_samples > s->start && s->size > 0 && s->loop != 0) {
if (s->nb_samples < s->size) {
int written = FFMIN(frame->nb_samples, s->size - s->nb_samples);
int drain = 0;
ret = av_audio_fifo_write(s->fifo, (void **)frame->extended_data, written);
if (ret < 0)
return ret;
if (!s->nb_samples) {
drain = FFMAX(0, s->start - s->ignored_samples);
s->pts = frame->pts;
av_audio_fifo_drain(s->fifo, drain);
s->pts += av_rescale_q(s->start - s->ignored_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
}
s->nb_samples += ret - drain;
drain = frame->nb_samples - written;
if (s->nb_samples == s->size && drain > 0) {
int ret2;
ret2 = av_audio_fifo_write(s->left, (void **)frame->extended_data, frame->nb_samples);
if (ret2 < 0)
return ret2;
av_audio_fifo_drain(s->left, drain);
}
frame->nb_samples = ret;
s->pts += av_rescale_q(ret, (AVRational){1, outlink->sample_rate}, outlink->time_base);
ret = ff_filter_frame(outlink, frame);
} else {
int nb_samples = frame->nb_samples;
av_frame_free(&frame);
ret = push_samples(ctx, nb_samples);
}
} else {
s->ignored_samples += frame->nb_samples;
frame->pts = s->pts;
s->pts += av_rescale_q(frame->nb_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
ret = ff_filter_frame(outlink, frame);
}
return ret;
}
static int arequest_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
LoopContext *s = ctx->priv;
int ret = 0;
if ((!s->size) ||
(s->nb_samples < s->size) ||
(s->nb_samples >= s->size && s->loop == 0)) {
int nb_samples = av_audio_fifo_size(s->left);
if (s->loop == 0 && nb_samples > 0) {
AVFrame *out;
out = ff_get_audio_buffer(outlink, nb_samples);
if (!out)
return AVERROR(ENOMEM);
av_audio_fifo_read(s->left, (void **)out->extended_data, nb_samples);
out->pts = s->pts;
s->pts += av_rescale_q(nb_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
ret = ff_filter_frame(outlink, out);
if (ret < 0)
return ret;
}
ret = ff_request_frame(ctx->inputs[0]);
} else {
ret = push_samples(ctx, 1024);
}
if (s->eof && s->nb_samples > 0 && s->loop != 0) {
ret = push_samples(ctx, 1024);
}
return ret;
}
static int aactivate(AVFilterContext *ctx)
{
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
LoopContext *s = ctx->priv;
AVFrame *frame = NULL;
int ret, status;
int64_t pts;
FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
if (!s->eof && (s->nb_samples < s->size || !s->loop || !s->size)) {
ret = ff_inlink_consume_frame(inlink, &frame);
if (ret < 0)
return ret;
if (ret > 0)
return afilter_frame(inlink, frame);
}
if (!s->eof && ff_inlink_acknowledge_status(inlink, &status, &pts)) {
if (status == AVERROR_EOF) {
s->size = s->nb_samples;
s->eof = 1;
}
}
if (s->eof && (!s->loop || !s->size)) {
ff_outlink_set_status(outlink, AVERROR_EOF, s->duration);
return 0;
}
if (!s->eof && (!s->size ||
(s->nb_samples < s->size) ||
(s->nb_samples >= s->size && s->loop == 0))) {
FF_FILTER_FORWARD_WANTED(outlink, inlink);
} else if (s->loop && s->nb_samples == s->size) {
return arequest_frame(outlink);
}
return FFERROR_NOT_READY;
}
static const AVOption aloop_options[] = {
{ "loop", "number of loops", OFFSET(loop), AV_OPT_TYPE_INT, {.i64 = 0 }, -1, INT_MAX, AFLAGS },
{ "size", "max number of samples to loop", OFFSET(size), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT32_MAX, AFLAGS },
{ "start", "set the loop start sample", OFFSET(start), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, AFLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(aloop);
static const AVFilterPad ainputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = aconfig_input,
},
{ NULL }
};
static const AVFilterPad aoutputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
},
{ NULL }
};
AVFilter ff_af_aloop = {
.name = "aloop",
.description = NULL_IF_CONFIG_SMALL("Loop audio samples."),
.priv_size = sizeof(LoopContext),
.priv_class = &aloop_class,
.activate = aactivate,
.uninit = auninit,
.inputs = ainputs,
.outputs = aoutputs,
};
#endif /* CONFIG_ALOOP_FILTER */
#if CONFIG_LOOP_FILTER
static av_cold int init(AVFilterContext *ctx)
{
LoopContext *s = ctx->priv;
s->frames = av_calloc(s->size, sizeof(*s->frames));
if (!s->frames)
return AVERROR(ENOMEM);
check_size(ctx);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
LoopContext *s = ctx->priv;
int i;
for (i = 0; i < s->nb_frames; i++)
av_frame_free(&s->frames[i]);
av_freep(&s->frames);
s->nb_frames = 0;
}
static int push_frame(AVFilterContext *ctx)
{
AVFilterLink *outlink = ctx->outputs[0];
LoopContext *s = ctx->priv;
int64_t pts, duration;
int ret;
AVFrame *out = av_frame_clone(s->frames[s->current_frame]);
if (!out)
return AVERROR(ENOMEM);
out->pts += s->duration - s->start_pts;
if (out->pkt_duration)
duration = out->pkt_duration;
else
duration = av_rescale_q(1, av_inv_q(outlink->frame_rate), outlink->time_base);
pts = out->pts + duration;
ret = ff_filter_frame(outlink, out);
s->current_frame++;
if (s->current_frame >= s->nb_frames) {
s->duration = pts;
s->current_frame = 0;
if (s->loop > 0)
s->loop--;
}
return ret;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
LoopContext *s = ctx->priv;
int64_t duration;
int ret = 0;
if (inlink->frame_count_out >= s->start && s->size > 0 && s->loop != 0) {
if (s->nb_frames < s->size) {
if (!s->nb_frames)
s->start_pts = frame->pts;
s->frames[s->nb_frames] = av_frame_clone(frame);
if (!s->frames[s->nb_frames]) {
av_frame_free(&frame);
return AVERROR(ENOMEM);
}
s->nb_frames++;
if (frame->pkt_duration)
duration = frame->pkt_duration;
else
duration = av_rescale_q(1, av_inv_q(outlink->frame_rate), outlink->time_base);
s->duration = frame->pts + duration;
ret = ff_filter_frame(outlink, frame);
} else {
av_frame_free(&frame);
ret = push_frame(ctx);
}
} else {
frame->pts += s->duration;
ret = ff_filter_frame(outlink, frame);
}
return ret;
}
static int activate(AVFilterContext *ctx)
{
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
LoopContext *s = ctx->priv;
AVFrame *frame = NULL;
int ret, status;
int64_t pts;
FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
if (!s->eof && (s->nb_frames < s->size || !s->loop || !s->size)) {
ret = ff_inlink_consume_frame(inlink, &frame);
if (ret < 0)
return ret;
if (ret > 0)
return filter_frame(inlink, frame);
}
if (!s->eof && ff_inlink_acknowledge_status(inlink, &status, &pts)) {
if (status == AVERROR_EOF) {
s->size = s->nb_frames;
s->eof = 1;
}
}
if (s->eof && (!s->loop || !s->size)) {
ff_outlink_set_status(outlink, AVERROR_EOF, s->duration);
return 0;
}
if (!s->eof && (!s->size ||
(s->nb_frames < s->size) ||
(s->nb_frames >= s->size && s->loop == 0))) {
FF_FILTER_FORWARD_WANTED(outlink, inlink);
} else if (s->loop && s->nb_frames == s->size) {
return push_frame(ctx);
}
return FFERROR_NOT_READY;
}
static const AVOption loop_options[] = {
{ "loop", "number of loops", OFFSET(loop), AV_OPT_TYPE_INT, {.i64 = 0 }, -1, INT_MAX, VFLAGS },
{ "size", "max number of frames to loop", OFFSET(size), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT16_MAX, VFLAGS },
{ "start", "set the loop start frame", OFFSET(start), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, VFLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(loop);
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_loop = {
.name = "loop",
.description = NULL_IF_CONFIG_SMALL("Loop video frames."),
.priv_size = sizeof(LoopContext),
.priv_class = &loop_class,
.init = init,
.uninit = uninit,
.activate = activate,
.inputs = inputs,
.outputs = outputs,
};
#endif /* CONFIG_LOOP_FILTER */
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