| /* |
| * 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 "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; |
| 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) |
| |
| #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); |
| |
| 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 += out->nb_samples; |
| 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->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 += s->start - s->ignored_samples; |
| } |
| 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 += ret; |
| 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 += frame->nb_samples; |
| 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 += nb_samples; |
| 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 (ret == AVERROR_EOF && s->nb_samples > 0 && s->loop != 0) { |
| ret = push_samples(ctx, outlink->sample_rate); |
| } |
| |
| return ret; |
| } |
| |
| 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, |
| .filter_frame = afilter_frame, |
| .config_props = aconfig_input, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad aoutputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .request_frame = arequest_frame, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_af_aloop = { |
| .name = "aloop", |
| .description = NULL_IF_CONFIG_SMALL("Loop audio samples."), |
| .priv_size = sizeof(LoopContext), |
| .priv_class = &aloop_class, |
| .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); |
| |
| 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; |
| int ret; |
| |
| AVFrame *out = av_frame_clone(s->frames[s->current_frame]); |
| |
| if (!out) |
| return AVERROR(ENOMEM); |
| out->pts += s->duration - s->start_pts; |
| pts = out->pts + out->pkt_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; |
| 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++; |
| s->duration = frame->pts + frame->pkt_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 request_frame(AVFilterLink *outlink) |
| { |
| AVFilterContext *ctx = outlink->src; |
| LoopContext *s = ctx->priv; |
| int ret = 0; |
| |
| if ((!s->size) || |
| (s->nb_frames < s->size) || |
| (s->nb_frames >= s->size && s->loop == 0)) { |
| ret = ff_request_frame(ctx->inputs[0]); |
| } else { |
| ret = push_frame(ctx); |
| } |
| |
| if (ret == AVERROR_EOF && s->nb_frames > 0 && s->loop != 0) { |
| ret = push_frame(ctx); |
| } |
| |
| return ret; |
| } |
| |
| 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, |
| .filter_frame = filter_frame, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .request_frame = request_frame, |
| }, |
| { 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, |
| .inputs = inputs, |
| .outputs = outputs, |
| }; |
| #endif /* CONFIG_LOOP_FILTER */ |