/*
* Copyright (c) 2013 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
* audio and video interleaver
*/
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "bufferqueue.h"
#include "formats.h"
#include "internal.h"
#include "audio.h"
#include "video.h"
typedef struct {
const AVClass *class;
int nb_inputs;
struct FFBufQueue *queues;
} InterleaveContext;
#define OFFSET(x) offsetof(InterleaveContext, x)
#define DEFINE_OPTIONS(filt_name, flags_) \
static const AVOption filt_name##_options[] = { \
{ "nb_inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, .flags = flags_ }, \
{ "n", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, .flags = flags_ }, \
{ NULL } \
}
inline static int push_frame(AVFilterContext *ctx)
{
InterleaveContext *s = ctx->priv;
AVFrame *frame;
int i, queue_idx = -1;
int64_t pts_min = INT64_MAX;
/* look for oldest frame */
for (i = 0; i < ctx->nb_inputs; i++) {
struct FFBufQueue *q = &s->queues[i];
if (!q->available && !ctx->inputs[i]->closed)
return 0;
if (q->available) {
frame = ff_bufqueue_peek(q, 0);
if (frame->pts < pts_min) {
pts_min = frame->pts;
queue_idx = i;
}
}
}
/* all inputs are closed */
if (queue_idx < 0)
return AVERROR_EOF;
frame = ff_bufqueue_get(&s->queues[queue_idx]);
av_log(ctx, AV_LOG_DEBUG, "queue:%d -> frame time:%f\n",
queue_idx, frame->pts * av_q2d(AV_TIME_BASE_Q));
return ff_filter_frame(ctx->outputs[0], frame);
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
InterleaveContext *s = ctx->priv;
unsigned in_no = FF_INLINK_IDX(inlink);
if (frame->pts == AV_NOPTS_VALUE) {
av_log(ctx, AV_LOG_WARNING,
"NOPTS value for input frame cannot be accepted, frame discarded\n");
av_frame_free(&frame);
return AVERROR_INVALIDDATA;
}
/* queue frame */
frame->pts = av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q);
av_log(ctx, AV_LOG_DEBUG, "frame pts:%f -> queue idx:%d available:%d\n",
frame->pts * av_q2d(AV_TIME_BASE_Q), in_no, s->queues[in_no].available);
ff_bufqueue_add(ctx, &s->queues[in_no], frame);
return push_frame(ctx);
}
static av_cold int init(AVFilterContext *ctx)
{
InterleaveContext *s = ctx->priv;
const AVFilterPad *outpad = &ctx->filter->outputs[0];
int i;
s->queues = av_calloc(s->nb_inputs, sizeof(s->queues[0]));
if (!s->queues)
return AVERROR(ENOMEM);
for (i = 0; i < s->nb_inputs; i++) {
AVFilterPad inpad = { 0 };
inpad.name = av_asprintf("input%d", i);
if (!inpad.name)
return AVERROR(ENOMEM);
inpad.type = outpad->type;
inpad.filter_frame = filter_frame;
switch (outpad->type) {
case AVMEDIA_TYPE_VIDEO:
inpad.get_video_buffer = ff_null_get_video_buffer; break;
case AVMEDIA_TYPE_AUDIO:
inpad.get_audio_buffer = ff_null_get_audio_buffer; break;
default:
av_assert0(0);
}
ff_insert_inpad(ctx, i, &inpad);
}
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
InterleaveContext *s = ctx->priv;
int i;
for (i = 0; i < ctx->nb_inputs; i++) {
ff_bufqueue_discard_all(&s->queues[i]);
av_freep(&s->queues[i]);
av_freep(&ctx->input_pads[i].name);
}
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink0 = ctx->inputs[0];
int i;
if (outlink->type == AVMEDIA_TYPE_VIDEO) {
outlink->time_base = AV_TIME_BASE_Q;
outlink->w = inlink0->w;
outlink->h = inlink0->h;
outlink->sample_aspect_ratio = inlink0->sample_aspect_ratio;
outlink->format = inlink0->format;
outlink->frame_rate = (AVRational) {1, 0};
for (i = 1; i < ctx->nb_inputs; i++) {
AVFilterLink *inlink = ctx->inputs[i];
if (outlink->w != inlink->w ||
outlink->h != inlink->h ||
outlink->sample_aspect_ratio.num != inlink->sample_aspect_ratio.num ||
outlink->sample_aspect_ratio.den != inlink->sample_aspect_ratio.den) {
av_log(ctx, AV_LOG_ERROR, "Parameters for input link %s "
"(size %dx%d, SAR %d:%d) do not match the corresponding "
"output link parameters (%dx%d, SAR %d:%d)\n",
ctx->input_pads[i].name, inlink->w, inlink->h,
inlink->sample_aspect_ratio.num,
inlink->sample_aspect_ratio.den,
outlink->w, outlink->h,
outlink->sample_aspect_ratio.num,
outlink->sample_aspect_ratio.den);
return AVERROR(EINVAL);
}
}
}
outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
return 0;
}
static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
InterleaveContext *s = ctx->priv;
int i, ret;
for (i = 0; i < ctx->nb_inputs; i++) {
if (!s->queues[i].available && !ctx->inputs[i]->closed) {
ret = ff_request_frame(ctx->inputs[i]);
if (ret != AVERROR_EOF)
return ret;
}
}
return push_frame(ctx);
}
#if CONFIG_INTERLEAVE_FILTER
DEFINE_OPTIONS(interleave, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
AVFILTER_DEFINE_CLASS(interleave);
static const AVFilterPad interleave_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
.request_frame = request_frame,
},
{ NULL }
};
AVFilter avfilter_vf_interleave = {
.name = "interleave",
.description = NULL_IF_CONFIG_SMALL("Temporally interleave video inputs."),
.priv_size = sizeof(InterleaveContext),
.init = init,
.uninit = uninit,
.outputs = interleave_outputs,
.priv_class = &interleave_class,
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
};
#endif
#if CONFIG_AINTERLEAVE_FILTER
DEFINE_OPTIONS(ainterleave, AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
AVFILTER_DEFINE_CLASS(ainterleave);
static const AVFilterPad ainterleave_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_output,
.request_frame = request_frame,
},
{ NULL }
};
AVFilter avfilter_af_ainterleave = {
.name = "ainterleave",
.description = NULL_IF_CONFIG_SMALL("Temporally interleave audio inputs."),
.priv_size = sizeof(InterleaveContext),
.init = init,
.uninit = uninit,
.outputs = ainterleave_outputs,
.priv_class = &ainterleave_class,
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
};
#endif