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/*
* Copyright (c) 2012 Nicolas George
*
* 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
* concat audio-video filter
*/
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "filters.h"
#include "internal.h"
#include "video.h"
#include "audio.h"
#define TYPE_ALL 2
typedef struct ConcatContext {
const AVClass *class;
unsigned nb_streams[TYPE_ALL]; /**< number of out streams of each type */
unsigned nb_segments;
unsigned cur_idx; /**< index of the first input of current segment */
int64_t delta_ts; /**< timestamp to add to produce output timestamps */
unsigned nb_in_active; /**< number of active inputs in current segment */
unsigned unsafe;
struct concat_in {
int64_t pts;
int64_t nb_frames;
unsigned eof;
} *in;
} ConcatContext;
#define OFFSET(x) offsetof(ConcatContext, x)
#define A AV_OPT_FLAG_AUDIO_PARAM
#define F AV_OPT_FLAG_FILTERING_PARAM
#define V AV_OPT_FLAG_VIDEO_PARAM
static const AVOption concat_options[] = {
{ "n", "specify the number of segments", OFFSET(nb_segments),
AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, V|A|F},
{ "v", "specify the number of video streams",
OFFSET(nb_streams[AVMEDIA_TYPE_VIDEO]),
AV_OPT_TYPE_INT, { .i64 = 1 }, 0, INT_MAX, V|F },
{ "a", "specify the number of audio streams",
OFFSET(nb_streams[AVMEDIA_TYPE_AUDIO]),
AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A|F},
{ "unsafe", "enable unsafe mode",
OFFSET(unsafe),
AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, V|A|F},
{ NULL }
};
AVFILTER_DEFINE_CLASS(concat);
static int query_formats(AVFilterContext *ctx)
{
ConcatContext *cat = ctx->priv;
unsigned type, nb_str, idx0 = 0, idx, str, seg;
AVFilterFormats *formats, *rates = NULL;
AVFilterChannelLayouts *layouts = NULL;
int ret;
for (type = 0; type < TYPE_ALL; type++) {
nb_str = cat->nb_streams[type];
for (str = 0; str < nb_str; str++) {
idx = idx0;
/* Set the output formats */
formats = ff_all_formats(type);
if ((ret = ff_formats_ref(formats, &ctx->outputs[idx]->incfg.formats)) < 0)
return ret;
if (type == AVMEDIA_TYPE_AUDIO) {
rates = ff_all_samplerates();
if ((ret = ff_formats_ref(rates, &ctx->outputs[idx]->incfg.samplerates)) < 0)
return ret;
layouts = ff_all_channel_layouts();
if ((ret = ff_channel_layouts_ref(layouts, &ctx->outputs[idx]->incfg.channel_layouts)) < 0)
return ret;
}
/* Set the same formats for each corresponding input */
for (seg = 0; seg < cat->nb_segments; seg++) {
if ((ret = ff_formats_ref(formats, &ctx->inputs[idx]->outcfg.formats)) < 0)
return ret;
if (type == AVMEDIA_TYPE_AUDIO) {
if ((ret = ff_formats_ref(rates, &ctx->inputs[idx]->outcfg.samplerates)) < 0 ||
(ret = ff_channel_layouts_ref(layouts, &ctx->inputs[idx]->outcfg.channel_layouts)) < 0)
return ret;
}
idx += ctx->nb_outputs;
}
idx0++;
}
}
return 0;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
ConcatContext *cat = ctx->priv;
unsigned out_no = FF_OUTLINK_IDX(outlink);
unsigned in_no = out_no, seg;
AVFilterLink *inlink = ctx->inputs[in_no];
/* enhancement: find a common one */
outlink->time_base = AV_TIME_BASE_Q;
outlink->w = inlink->w;
outlink->h = inlink->h;
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
outlink->format = inlink->format;
outlink->frame_rate = inlink->frame_rate;
for (seg = 1; seg < cat->nb_segments; seg++) {
inlink = ctx->inputs[in_no + seg * ctx->nb_outputs];
if (outlink->frame_rate.num != inlink->frame_rate.num ||
outlink->frame_rate.den != inlink->frame_rate.den) {
av_log(ctx, AV_LOG_VERBOSE,
"Video inputs have different frame rates, output will be VFR\n");
outlink->frame_rate = av_make_q(1, 0);
break;
}
}
for (seg = 1; seg < cat->nb_segments; seg++) {
inlink = ctx->inputs[in_no + seg * ctx->nb_outputs];
if (!outlink->sample_aspect_ratio.num)
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
/* possible enhancement: unsafe mode, do not check */
if (outlink->w != inlink->w ||
outlink->h != inlink->h ||
outlink->sample_aspect_ratio.num != inlink->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, "Input link %s parameters "
"(size %dx%d, SAR %d:%d) do not match the corresponding "
"output link %s parameters (%dx%d, SAR %d:%d)\n",
ctx->input_pads[in_no].name, inlink->w, inlink->h,
inlink->sample_aspect_ratio.num,
inlink->sample_aspect_ratio.den,
ctx->input_pads[out_no].name, outlink->w, outlink->h,
outlink->sample_aspect_ratio.num,
outlink->sample_aspect_ratio.den);
if (!cat->unsafe)
return AVERROR(EINVAL);
}
}
return 0;
}
static int push_frame(AVFilterContext *ctx, unsigned in_no, AVFrame *buf)
{
ConcatContext *cat = ctx->priv;
unsigned out_no = in_no % ctx->nb_outputs;
AVFilterLink * inlink = ctx-> inputs[ in_no];
AVFilterLink *outlink = ctx->outputs[out_no];
struct concat_in *in = &cat->in[in_no];
buf->pts = av_rescale_q(buf->pts, inlink->time_base, outlink->time_base);
in->pts = buf->pts;
in->nb_frames++;
/* add duration to input PTS */
if (inlink->sample_rate)
/* use number of audio samples */
in->pts += av_rescale_q(buf->nb_samples,
av_make_q(1, inlink->sample_rate),
outlink->time_base);
else if (in->nb_frames >= 2)
/* use mean duration */
in->pts = av_rescale(in->pts, in->nb_frames, in->nb_frames - 1);
buf->pts += cat->delta_ts;
return ff_filter_frame(outlink, buf);
}
static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h)
{
AVFilterContext *ctx = inlink->dst;
unsigned in_no = FF_INLINK_IDX(inlink);
AVFilterLink *outlink = ctx->outputs[in_no % ctx->nb_outputs];
return ff_get_video_buffer(outlink, w, h);
}
static AVFrame *get_audio_buffer(AVFilterLink *inlink, int nb_samples)
{
AVFilterContext *ctx = inlink->dst;
unsigned in_no = FF_INLINK_IDX(inlink);
AVFilterLink *outlink = ctx->outputs[in_no % ctx->nb_outputs];
return ff_get_audio_buffer(outlink, nb_samples);
}
static void close_input(AVFilterContext *ctx, unsigned in_no)
{
ConcatContext *cat = ctx->priv;
cat->in[in_no].eof = 1;
cat->nb_in_active--;
av_log(ctx, AV_LOG_VERBOSE, "EOF on %s, %d streams left in segment.\n",
ctx->input_pads[in_no].name, cat->nb_in_active);
}
static void find_next_delta_ts(AVFilterContext *ctx, int64_t *seg_delta)
{
ConcatContext *cat = ctx->priv;
unsigned i = cat->cur_idx;
unsigned imax = i + ctx->nb_outputs;
int64_t pts;
pts = cat->in[i++].pts;
for (; i < imax; i++)
pts = FFMAX(pts, cat->in[i].pts);
cat->delta_ts += pts;
*seg_delta = pts;
}
static int send_silence(AVFilterContext *ctx, unsigned in_no, unsigned out_no,
int64_t seg_delta)
{
ConcatContext *cat = ctx->priv;
AVFilterLink *outlink = ctx->outputs[out_no];
int64_t base_pts = cat->in[in_no].pts + cat->delta_ts - seg_delta;
int64_t nb_samples, sent = 0;
int frame_nb_samples, ret;
AVRational rate_tb = { 1, ctx->inputs[in_no]->sample_rate };
AVFrame *buf;
if (!rate_tb.den)
return AVERROR_BUG;
if (cat->in[in_no].pts < INT64_MIN + seg_delta)
return AVERROR_INVALIDDATA;
if (seg_delta < cat->in[in_no].pts)
return AVERROR_INVALIDDATA;
nb_samples = av_rescale_q(seg_delta - cat->in[in_no].pts,
outlink->time_base, rate_tb);
frame_nb_samples = FFMAX(9600, rate_tb.den / 5); /* arbitrary */
while (nb_samples) {
frame_nb_samples = FFMIN(frame_nb_samples, nb_samples);
buf = ff_get_audio_buffer(outlink, frame_nb_samples);
if (!buf)
return AVERROR(ENOMEM);
av_samples_set_silence(buf->extended_data, 0, frame_nb_samples,
outlink->channels, outlink->format);
buf->pts = base_pts + av_rescale_q(sent, rate_tb, outlink->time_base);
ret = ff_filter_frame(outlink, buf);
if (ret < 0)
return ret;
sent += frame_nb_samples;
nb_samples -= frame_nb_samples;
}
return 0;
}
static int flush_segment(AVFilterContext *ctx)
{
int ret;
ConcatContext *cat = ctx->priv;
unsigned str, str_max;
int64_t seg_delta;
find_next_delta_ts(ctx, &seg_delta);
cat->cur_idx += ctx->nb_outputs;
cat->nb_in_active = ctx->nb_outputs;
av_log(ctx, AV_LOG_VERBOSE, "Segment finished at pts=%"PRId64"\n",
cat->delta_ts);
if (cat->cur_idx < ctx->nb_inputs) {
/* pad audio streams with silence */
str = cat->nb_streams[AVMEDIA_TYPE_VIDEO];
str_max = str + cat->nb_streams[AVMEDIA_TYPE_AUDIO];
for (; str < str_max; str++) {
ret = send_silence(ctx, cat->cur_idx - ctx->nb_outputs + str, str,
seg_delta);
if (ret < 0)
return ret;
}
}
return 0;
}
static av_cold int init(AVFilterContext *ctx)
{
ConcatContext *cat = ctx->priv;
unsigned seg, type, str;
int ret;
/* create input pads */
for (seg = 0; seg < cat->nb_segments; seg++) {
for (type = 0; type < TYPE_ALL; type++) {
for (str = 0; str < cat->nb_streams[type]; str++) {
AVFilterPad pad = {
.type = type,
.get_video_buffer = get_video_buffer,
.get_audio_buffer = get_audio_buffer,
};
pad.name = av_asprintf("in%d:%c%d", seg, "va"[type], str);
if ((ret = ff_insert_inpad(ctx, ctx->nb_inputs, &pad)) < 0) {
av_freep(&pad.name);
return ret;
}
}
}
}
/* create output pads */
for (type = 0; type < TYPE_ALL; type++) {
for (str = 0; str < cat->nb_streams[type]; str++) {
AVFilterPad pad = {
.type = type,
.config_props = config_output,
};
pad.name = av_asprintf("out:%c%d", "va"[type], str);
if ((ret = ff_insert_outpad(ctx, ctx->nb_outputs, &pad)) < 0) {
av_freep(&pad.name);
return ret;
}
}
}
cat->in = av_calloc(ctx->nb_inputs, sizeof(*cat->in));
if (!cat->in)
return AVERROR(ENOMEM);
cat->nb_in_active = ctx->nb_outputs;
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
ConcatContext *cat = ctx->priv;
unsigned i;
for (i = 0; i < ctx->nb_inputs; i++)
av_freep(&ctx->input_pads[i].name);
for (i = 0; i < ctx->nb_outputs; i++)
av_freep(&ctx->output_pads[i].name);
av_freep(&cat->in);
}
static int activate(AVFilterContext *ctx)
{
ConcatContext *cat = ctx->priv;
AVFrame *frame;
unsigned i, j;
int ret, status;
int64_t pts;
/* Forward status back */
for (i = 0; i < ctx->nb_outputs; i++) {
status = ff_outlink_get_status(ctx->outputs[i]);
if (!status)
continue;
for (j = i; j < ctx->nb_inputs; j += ctx->nb_outputs) {
if (!cat->in[j].eof) {
cat->in[j].eof = 1;
ff_inlink_set_status(ctx->inputs[j], status);
return 0;
}
}
}
/* Forward available frames */
if (cat->cur_idx < ctx->nb_inputs) {
for (i = 0; i < ctx->nb_outputs; i++) {
ret = ff_inlink_consume_frame(ctx->inputs[cat->cur_idx + i], &frame);
if (ret < 0)
return ret;
if (ret) {
ff_filter_set_ready(ctx, 10);
return push_frame(ctx, cat->cur_idx + i, frame);
}
}
}
/* Forward status change */
if (cat->cur_idx < ctx->nb_inputs) {
for (i = 0; i < ctx->nb_outputs; i++) {
ret = ff_inlink_acknowledge_status(ctx->inputs[cat->cur_idx + i], &status, &pts);
/* TODO use pts */
if (ret > 0) {
close_input(ctx, cat->cur_idx + i);
if (cat->cur_idx + ctx->nb_outputs >= ctx->nb_inputs) {
ff_outlink_set_status(ctx->outputs[i], status, pts);
}
if (!cat->nb_in_active) {
ret = flush_segment(ctx);
if (ret < 0)
return ret;
}
ff_filter_set_ready(ctx, 10);
return 0;
}
}
}
ret = FFERROR_NOT_READY;
for (i = 0; i < ctx->nb_outputs; i++) {
if (ff_outlink_frame_wanted(ctx->outputs[i])) {
if (cat->in[cat->cur_idx + i].eof) {
for (j = 0; j < ctx->nb_outputs; j++)
if (!cat->in[cat->cur_idx + j].eof)
ff_inlink_request_frame(ctx->inputs[cat->cur_idx + j]);
return 0;
} else {
ff_inlink_request_frame(ctx->inputs[cat->cur_idx + i]);
ret = 0;
}
}
}
return ret;
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
int ret = AVERROR(ENOSYS);
if (!strcmp(cmd, "next")) {
av_log(ctx, AV_LOG_VERBOSE, "Command received: next\n");
return flush_segment(ctx);
}
return ret;
}
AVFilter ff_avf_concat = {
.name = "concat",
.description = NULL_IF_CONFIG_SMALL("Concatenate audio and video streams."),
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.activate = activate,
.priv_size = sizeof(ConcatContext),
.inputs = NULL,
.outputs = NULL,
.priv_class = &concat_class,
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_DYNAMIC_OUTPUTS,
.process_command = process_command,
};