0,0 → 1,426 |
/* |
* 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 |
*/ |
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#include "libavutil/avassert.h" |
#include "libavutil/avstring.h" |
#include "libavutil/channel_layout.h" |
#include "libavutil/opt.h" |
#include "avfilter.h" |
#define FF_BUFQUEUE_SIZE 256 |
#include "bufferqueue.h" |
#include "internal.h" |
#include "video.h" |
#include "audio.h" |
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#define TYPE_ALL 2 |
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typedef struct { |
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; |
struct FFBufQueue queue; |
} *in; |
} ConcatContext; |
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#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 |
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static const AVOption concat_options[] = { |
{ "n", "specify the number of segments", OFFSET(nb_segments), |
AV_OPT_TYPE_INT, { .i64 = 2 }, 2, 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_INT, { .i64 = 0 }, 0, INT_MAX, V|A|F}, |
{ NULL } |
}; |
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AVFILTER_DEFINE_CLASS(concat); |
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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; |
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for (type = 0; type < TYPE_ALL; type++) { |
nb_str = cat->nb_streams[type]; |
for (str = 0; str < nb_str; str++) { |
idx = idx0; |
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/* Set the output formats */ |
formats = ff_all_formats(type); |
if (!formats) |
return AVERROR(ENOMEM); |
ff_formats_ref(formats, &ctx->outputs[idx]->in_formats); |
if (type == AVMEDIA_TYPE_AUDIO) { |
rates = ff_all_samplerates(); |
if (!rates) |
return AVERROR(ENOMEM); |
ff_formats_ref(rates, &ctx->outputs[idx]->in_samplerates); |
layouts = ff_all_channel_layouts(); |
if (!layouts) |
return AVERROR(ENOMEM); |
ff_channel_layouts_ref(layouts, &ctx->outputs[idx]->in_channel_layouts); |
} |
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/* Set the same formats for each corresponding input */ |
for (seg = 0; seg < cat->nb_segments; seg++) { |
ff_formats_ref(formats, &ctx->inputs[idx]->out_formats); |
if (type == AVMEDIA_TYPE_AUDIO) { |
ff_formats_ref(rates, &ctx->inputs[idx]->out_samplerates); |
ff_channel_layouts_ref(layouts, &ctx->inputs[idx]->out_channel_layouts); |
} |
idx += ctx->nb_outputs; |
} |
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idx0++; |
} |
} |
return 0; |
} |
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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]; |
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/* 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; |
for (seg = 1; seg < cat->nb_segments; seg++) { |
inlink = ctx->inputs[in_no += 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); |
} |
} |
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return 0; |
} |
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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]; |
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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, |
(AVRational){ 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); |
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buf->pts += cat->delta_ts; |
return ff_filter_frame(outlink, buf); |
} |
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static int process_frame(AVFilterLink *inlink, AVFrame *buf) |
{ |
AVFilterContext *ctx = inlink->dst; |
ConcatContext *cat = ctx->priv; |
unsigned in_no = FF_INLINK_IDX(inlink); |
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if (in_no < cat->cur_idx) { |
av_log(ctx, AV_LOG_ERROR, "Frame after EOF on input %s\n", |
ctx->input_pads[in_no].name); |
av_frame_free(&buf); |
} else if (in_no >= cat->cur_idx + ctx->nb_outputs) { |
ff_bufqueue_add(ctx, &cat->in[in_no].queue, buf); |
} else { |
return push_frame(ctx, in_no, buf); |
} |
return 0; |
} |
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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]; |
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return ff_get_video_buffer(outlink, w, h); |
} |
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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]; |
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return ff_get_audio_buffer(outlink, nb_samples); |
} |
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static int filter_frame(AVFilterLink *inlink, AVFrame *buf) |
{ |
return process_frame(inlink, buf); |
} |
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static void close_input(AVFilterContext *ctx, unsigned in_no) |
{ |
ConcatContext *cat = ctx->priv; |
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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); |
} |
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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; |
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pts = cat->in[i++].pts; |
for (; i < imax; i++) |
pts = FFMAX(pts, cat->in[i].pts); |
cat->delta_ts += pts; |
*seg_delta = pts; |
} |
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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; |
int nb_channels = av_get_channel_layout_nb_channels(outlink->channel_layout); |
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if (!rate_tb.den) |
return AVERROR_BUG; |
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, |
nb_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; |
} |
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static int flush_segment(AVFilterContext *ctx) |
{ |
int ret; |
ConcatContext *cat = ctx->priv; |
unsigned str, str_max; |
int64_t seg_delta; |
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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); |
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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; |
} |
/* flush queued buffers */ |
/* possible enhancement: flush in PTS order */ |
str_max = cat->cur_idx + ctx->nb_outputs; |
for (str = cat->cur_idx; str < str_max; str++) { |
while (cat->in[str].queue.available) { |
ret = push_frame(ctx, str, ff_bufqueue_get(&cat->in[str].queue)); |
if (ret < 0) |
return ret; |
} |
} |
} |
return 0; |
} |
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static int request_frame(AVFilterLink *outlink) |
{ |
AVFilterContext *ctx = outlink->src; |
ConcatContext *cat = ctx->priv; |
unsigned out_no = FF_OUTLINK_IDX(outlink); |
unsigned in_no = out_no + cat->cur_idx; |
unsigned str, str_max; |
int ret; |
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while (1) { |
if (in_no >= ctx->nb_inputs) |
return AVERROR_EOF; |
if (!cat->in[in_no].eof) { |
ret = ff_request_frame(ctx->inputs[in_no]); |
if (ret != AVERROR_EOF) |
return ret; |
close_input(ctx, in_no); |
} |
/* cycle on all inputs to finish the segment */ |
/* possible enhancement: request in PTS order */ |
str_max = cat->cur_idx + ctx->nb_outputs - 1; |
for (str = cat->cur_idx; cat->nb_in_active; |
str = str == str_max ? cat->cur_idx : str + 1) { |
if (cat->in[str].eof) |
continue; |
ret = ff_request_frame(ctx->inputs[str]); |
if (ret == AVERROR_EOF) |
close_input(ctx, str); |
else if (ret < 0) |
return ret; |
} |
ret = flush_segment(ctx); |
if (ret < 0) |
return ret; |
in_no += ctx->nb_outputs; |
} |
} |
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static av_cold int init(AVFilterContext *ctx) |
{ |
ConcatContext *cat = ctx->priv; |
unsigned seg, type, str; |
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/* 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, |
.filter_frame = filter_frame, |
}; |
pad.name = av_asprintf("in%d:%c%d", seg, "va"[type], str); |
ff_insert_inpad(ctx, ctx->nb_inputs, &pad); |
} |
} |
} |
/* 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, |
.request_frame = request_frame, |
}; |
pad.name = av_asprintf("out:%c%d", "va"[type], str); |
ff_insert_outpad(ctx, ctx->nb_outputs, &pad); |
} |
} |
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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; |
} |
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static av_cold void uninit(AVFilterContext *ctx) |
{ |
ConcatContext *cat = ctx->priv; |
unsigned i; |
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for (i = 0; i < ctx->nb_inputs; i++) { |
av_freep(&ctx->input_pads[i].name); |
ff_bufqueue_discard_all(&cat->in[i].queue); |
} |
for (i = 0; i < ctx->nb_outputs; i++) |
av_freep(&ctx->output_pads[i].name); |
av_free(cat->in); |
} |
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AVFilter avfilter_avf_concat = { |
.name = "concat", |
.description = NULL_IF_CONFIG_SMALL("Concatenate audio and video streams."), |
.init = init, |
.uninit = uninit, |
.query_formats = query_formats, |
.priv_size = sizeof(ConcatContext), |
.inputs = NULL, |
.outputs = NULL, |
.priv_class = &concat_class, |
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_DYNAMIC_OUTPUTS, |
}; |