2 * ffmpeg filter configuration
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "libavfilter/avfilter.h"
24 #include "libavfilter/avfiltergraph.h"
25 #include "libavfilter/buffersink.h"
27 #include "libavutil/avassert.h"
28 #include "libavutil/avstring.h"
29 #include "libavutil/bprint.h"
30 #include "libavutil/channel_layout.h"
31 #include "libavutil/opt.h"
32 #include "libavutil/pixdesc.h"
33 #include "libavutil/pixfmt.h"
34 #include "libavutil/imgutils.h"
35 #include "libavutil/samplefmt.h"
37 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFormat target)
39 if (codec && codec->pix_fmts) {
40 const enum AVPixelFormat *p = codec->pix_fmts;
41 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
42 int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
43 enum AVPixelFormat best= AV_PIX_FMT_NONE;
44 if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
45 if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
46 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
47 } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
48 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
49 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
52 for (; *p != AV_PIX_FMT_NONE; p++) {
53 best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
57 if (*p == AV_PIX_FMT_NONE) {
58 if (target != AV_PIX_FMT_NONE)
59 av_log(NULL, AV_LOG_WARNING,
60 "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
61 av_get_pix_fmt_name(target),
63 av_get_pix_fmt_name(best));
70 void choose_sample_fmt(AVStream *st, AVCodec *codec)
72 if (codec && codec->sample_fmts) {
73 const enum AVSampleFormat *p = codec->sample_fmts;
74 for (; *p != -1; p++) {
75 if (*p == st->codec->sample_fmt)
79 if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
80 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
81 if(av_get_sample_fmt_name(st->codec->sample_fmt))
82 av_log(NULL, AV_LOG_WARNING,
83 "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
84 av_get_sample_fmt_name(st->codec->sample_fmt),
86 av_get_sample_fmt_name(codec->sample_fmts[0]));
87 st->codec->sample_fmt = codec->sample_fmts[0];
92 static char *choose_pix_fmts(OutputStream *ost)
94 if (ost->keep_pix_fmt) {
96 avfilter_graph_set_auto_convert(ost->filter->graph->graph,
97 AVFILTER_AUTO_CONVERT_NONE);
98 if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
100 return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
102 if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
103 return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
104 } else if (ost->enc && ost->enc->pix_fmts) {
105 const enum AVPixelFormat *p;
106 AVIOContext *s = NULL;
110 if (avio_open_dyn_buf(&s) < 0)
113 p = ost->enc->pix_fmts;
114 if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
115 if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
116 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
117 } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
118 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
119 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
123 for (; *p != AV_PIX_FMT_NONE; p++) {
124 const char *name = av_get_pix_fmt_name(*p);
125 avio_printf(s, "%s:", name);
127 len = avio_close_dyn_buf(s, &ret);
134 /* Define a function for building a string containing a list of
135 * allowed formats. */
136 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name, separator)\
137 static char *choose_ ## var ## s(OutputStream *ost) \
139 if (ost->st->codec->var != none) { \
140 get_name(ost->st->codec->var); \
141 return av_strdup(name); \
142 } else if (ost->enc->supported_list) { \
144 AVIOContext *s = NULL; \
148 if (avio_open_dyn_buf(&s) < 0) \
151 for (p = ost->enc->supported_list; *p != none; p++) { \
153 avio_printf(s, "%s" separator, name); \
155 len = avio_close_dyn_buf(s, &ret); \
162 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
163 // GET_PIX_FMT_NAME, ":")
165 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
166 AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME, ",")
168 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
169 GET_SAMPLE_RATE_NAME, ",")
171 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
172 GET_CH_LAYOUT_NAME, ",")
174 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
176 FilterGraph *fg = av_mallocz(sizeof(*fg));
180 fg->index = nb_filtergraphs;
182 GROW_ARRAY(fg->outputs, fg->nb_outputs);
183 if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
185 fg->outputs[0]->ost = ost;
186 fg->outputs[0]->graph = fg;
188 ost->filter = fg->outputs[0];
190 GROW_ARRAY(fg->inputs, fg->nb_inputs);
191 if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
193 fg->inputs[0]->ist = ist;
194 fg->inputs[0]->graph = fg;
196 GROW_ARRAY(ist->filters, ist->nb_filters);
197 ist->filters[ist->nb_filters - 1] = fg->inputs[0];
199 GROW_ARRAY(filtergraphs, nb_filtergraphs);
200 filtergraphs[nb_filtergraphs - 1] = fg;
205 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
207 InputStream *ist = NULL;
208 enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
211 // TODO: support other filter types
212 if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
213 av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
222 int file_idx = strtol(in->name, &p, 0);
224 if (file_idx < 0 || file_idx >= nb_input_files) {
225 av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
226 file_idx, fg->graph_desc);
229 s = input_files[file_idx]->ctx;
231 for (i = 0; i < s->nb_streams; i++) {
232 enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
233 if (stream_type != type &&
234 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
235 type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
237 if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
243 av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
244 "matches no streams.\n", p, fg->graph_desc);
247 ist = input_streams[input_files[file_idx]->ist_index + st->index];
249 /* find the first unused stream of corresponding type */
250 for (i = 0; i < nb_input_streams; i++) {
251 ist = input_streams[i];
252 if (ist->st->codec->codec_type == type && ist->discard)
255 if (i == nb_input_streams) {
256 av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
257 "unlabeled input pad %d on filter %s\n", in->pad_idx,
258 in->filter_ctx->name);
265 ist->decoding_needed++;
266 ist->st->discard = AVDISCARD_NONE;
268 GROW_ARRAY(fg->inputs, fg->nb_inputs);
269 if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
271 fg->inputs[fg->nb_inputs - 1]->ist = ist;
272 fg->inputs[fg->nb_inputs - 1]->graph = fg;
274 GROW_ARRAY(ist->filters, ist->nb_filters);
275 ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
278 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
281 OutputStream *ost = ofilter->ost;
282 AVCodecContext *codec = ost->st->codec;
283 AVFilterContext *last_filter = out->filter_ctx;
284 int pad_idx = out->pad_idx;
287 AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc();
289 snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
290 ret = avfilter_graph_create_filter(&ofilter->filter,
291 avfilter_get_by_name("ffbuffersink"),
292 name, NULL, NULL, fg->graph);
293 av_freep(&buffersink_params);
298 if (codec->width || codec->height) {
300 AVFilterContext *filter;
302 snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
305 (unsigned)ost->sws_flags);
306 snprintf(name, sizeof(name), "scaler for output stream %d:%d",
307 ost->file_index, ost->index);
308 if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
309 name, args, NULL, fg->graph)) < 0)
311 if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
314 last_filter = filter;
318 if ((pix_fmts = choose_pix_fmts(ost))) {
319 AVFilterContext *filter;
320 snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
321 ost->file_index, ost->index);
322 if ((ret = avfilter_graph_create_filter(&filter,
323 avfilter_get_by_name("format"),
324 "format", pix_fmts, NULL,
327 if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
330 last_filter = filter;
335 if (ost->frame_rate.num && 0) {
336 AVFilterContext *fps;
339 snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
340 ost->frame_rate.den);
341 snprintf(name, sizeof(name), "fps for output stream %d:%d",
342 ost->file_index, ost->index);
343 ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
344 name, args, NULL, fg->graph);
348 ret = avfilter_link(last_filter, pad_idx, fps, 0);
355 if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
361 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
363 OutputStream *ost = ofilter->ost;
364 AVCodecContext *codec = ost->st->codec;
365 AVFilterContext *last_filter = out->filter_ctx;
366 int pad_idx = out->pad_idx;
367 char *sample_fmts, *sample_rates, *channel_layouts;
372 snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
373 ret = avfilter_graph_create_filter(&ofilter->filter,
374 avfilter_get_by_name("ffabuffersink"),
375 name, NULL, NULL, fg->graph);
379 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do { \
380 AVFilterContext *filt_ctx; \
382 av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \
383 "similarly to -af " filter_name "=%s.\n", arg); \
385 ret = avfilter_graph_create_filter(&filt_ctx, \
386 avfilter_get_by_name(filter_name), \
387 filter_name, arg, NULL, fg->graph); \
391 ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0); \
395 last_filter = filt_ctx; \
398 if (ost->audio_channels_mapped) {
401 av_bprint_init(&pan_buf, 256, 8192);
402 av_bprintf(&pan_buf, "0x%"PRIx64,
403 av_get_default_channel_layout(ost->audio_channels_mapped));
404 for (i = 0; i < ost->audio_channels_mapped; i++)
405 if (ost->audio_channels_map[i] != -1)
406 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
408 AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
409 av_bprint_finalize(&pan_buf, NULL);
412 if (codec->channels && !codec->channel_layout)
413 codec->channel_layout = av_get_default_channel_layout(codec->channels);
415 sample_fmts = choose_sample_fmts(ost);
416 sample_rates = choose_sample_rates(ost);
417 channel_layouts = choose_channel_layouts(ost);
418 if (sample_fmts || sample_rates || channel_layouts) {
419 AVFilterContext *format;
424 av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
427 av_strlcatf(args, sizeof(args), "sample_rates=%s:",
430 av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
433 av_freep(&sample_fmts);
434 av_freep(&sample_rates);
435 av_freep(&channel_layouts);
437 snprintf(name, sizeof(name), "audio format for output stream %d:%d",
438 ost->file_index, ost->index);
439 ret = avfilter_graph_create_filter(&format,
440 avfilter_get_by_name("aformat"),
441 name, args, NULL, fg->graph);
445 ret = avfilter_link(last_filter, pad_idx, format, 0);
449 last_filter = format;
453 if (audio_volume != 256 && 0) {
456 snprintf(args, sizeof(args), "%f", audio_volume / 256.);
457 AUTO_INSERT_FILTER("-vol", "volume", args);
460 if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
466 #define DESCRIBE_FILTER_LINK(f, inout, in) \
468 AVFilterContext *ctx = inout->filter_ctx; \
469 AVFilterPad *pads = in ? ctx->input_pads : ctx->output_pads; \
470 int nb_pads = in ? ctx->input_count : ctx->output_count; \
473 if (avio_open_dyn_buf(&pb) < 0) \
476 avio_printf(pb, "%s", ctx->filter->name); \
478 avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
480 avio_close_dyn_buf(pb, &f->name); \
483 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
485 av_freep(&ofilter->name);
486 DESCRIBE_FILTER_LINK(ofilter, out, 0);
488 switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
489 case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
490 case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
491 default: av_assert0(0);
495 static int sub2video_prepare(InputStream *ist)
497 AVFormatContext *avf = input_files[ist->file_index]->ctx;
502 /* Compute the size of the canvas for the subtitles stream.
503 If the subtitles codec has set a size, use it. Otherwise use the
504 maximum dimensions of the video streams in the same file. */
505 w = ist->st->codec->width;
506 h = ist->st->codec->height;
508 for (i = 0; i < avf->nb_streams; i++) {
509 if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
510 w = FFMAX(w, avf->streams[i]->codec->width);
511 h = FFMAX(h, avf->streams[i]->codec->height);
518 av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
520 ist->sub2video.w = ist->st->codec->width = ist->resample_width = w;
521 ist->sub2video.h = ist->st->codec->height = ist->resample_height = h;
523 /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
524 palettes for all rectangles are identical or compatible */
525 ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
527 ret = av_image_alloc(image, linesize, w, h, AV_PIX_FMT_RGB32, 32);
530 memset(image[0], 0, h * linesize[0]);
531 ist->sub2video.ref = avfilter_get_video_buffer_ref_from_arrays(
532 image, linesize, AV_PERM_READ | AV_PERM_PRESERVE,
533 w, h, AV_PIX_FMT_RGB32);
534 if (!ist->sub2video.ref) {
536 return AVERROR(ENOMEM);
541 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
544 AVFilterContext *first_filter = in->filter_ctx;
545 AVFilter *filter = avfilter_get_by_name("buffer");
546 InputStream *ist = ifilter->ist;
547 AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
549 AVRational fr = ist->framerate.num ? ist->framerate :
550 ist->st->r_frame_rate;
554 int pad_idx = in->pad_idx;
557 if (!ist->framerate.num && ist->st->codec->ticks_per_frame>1) {
558 AVRational codec_fr = av_inv_q(ist->st->codec->time_base);
559 AVRational avg_fr = ist->st->avg_frame_rate;
560 codec_fr.den *= ist->st->codec->ticks_per_frame;
561 if ( codec_fr.num>0 && codec_fr.den>0 && av_q2d(codec_fr) < av_q2d(fr)*0.7
562 && fabs(1.0 - av_q2d(av_div_q(avg_fr, fr)))>0.1)
566 if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
567 ret = sub2video_prepare(ist);
572 sar = ist->st->sample_aspect_ratio.num ?
573 ist->st->sample_aspect_ratio :
574 ist->st->codec->sample_aspect_ratio;
576 sar = (AVRational){0,1};
577 av_bprint_init(&args, 0, 1);
579 "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
580 "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
581 ist->resample_height, ist->resample_pix_fmt,
582 tb.num, tb.den, sar.num, sar.den,
583 SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
584 if (fr.num && fr.den)
585 av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
586 snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
587 ist->file_index, ist->st->index);
589 if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
590 args.str, NULL, fg->graph)) < 0)
593 if (ist->framerate.num) {
594 AVFilterContext *setpts;
596 snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
597 ist->file_index, ist->st->index);
598 if ((ret = avfilter_graph_create_filter(&setpts,
599 avfilter_get_by_name("setpts"),
604 if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
607 first_filter = setpts;
611 if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
616 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
619 AVFilterContext *first_filter = in->filter_ctx;
620 AVFilter *filter = avfilter_get_by_name("abuffer");
621 InputStream *ist = ifilter->ist;
622 int pad_idx = in->pad_idx;
623 char args[255], name[255];
626 snprintf(args, sizeof(args), "time_base=%d/%d:sample_rate=%d:sample_fmt=%s"
627 ":channel_layout=0x%"PRIx64,
628 1, ist->st->codec->sample_rate,
629 ist->st->codec->sample_rate,
630 av_get_sample_fmt_name(ist->st->codec->sample_fmt),
631 ist->st->codec->channel_layout);
632 snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
633 ist->file_index, ist->st->index);
635 if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
640 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do { \
641 AVFilterContext *filt_ctx; \
643 av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \
644 "similarly to -af " filter_name "=%s.\n", arg); \
646 snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d", \
647 fg->index, filter_name, ist->file_index, ist->st->index); \
648 ret = avfilter_graph_create_filter(&filt_ctx, \
649 avfilter_get_by_name(filter_name), \
650 name, arg, NULL, fg->graph); \
654 ret = avfilter_link(filt_ctx, 0, first_filter, pad_idx); \
658 first_filter = filt_ctx; \
661 if (audio_sync_method > 0) {
662 char args[256] = {0};
664 av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
665 if (audio_drift_threshold != 0.1)
666 av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
667 AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
670 // if (ost->audio_channels_mapped) {
673 // av_bprint_init(&pan_buf, 256, 8192);
674 // av_bprintf(&pan_buf, "0x%"PRIx64,
675 // av_get_default_channel_layout(ost->audio_channels_mapped));
676 // for (i = 0; i < ost->audio_channels_mapped; i++)
677 // if (ost->audio_channels_map[i] != -1)
678 // av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
679 // AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
680 // av_bprint_finalize(&pan_buf, NULL);
683 if (audio_volume != 256) {
686 av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
687 "audio filter instead.\n");
689 snprintf(args, sizeof(args), "%f", audio_volume / 256.);
690 AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
692 if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
698 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
701 av_freep(&ifilter->name);
702 DESCRIBE_FILTER_LINK(ifilter, in, 1);
704 switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
705 case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
706 case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
707 default: av_assert0(0);
711 int configure_filtergraph(FilterGraph *fg)
713 AVFilterInOut *inputs, *outputs, *cur;
714 int ret, i, init = !fg->graph, simple = !fg->graph_desc;
715 const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
718 avfilter_graph_free(&fg->graph);
719 if (!(fg->graph = avfilter_graph_alloc()))
720 return AVERROR(ENOMEM);
723 OutputStream *ost = fg->outputs[0]->ost;
725 snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
726 fg->graph->scale_sws_opts = av_strdup(args);
729 if (ost->swr_filter_type != SWR_FILTER_TYPE_KAISER)
730 av_strlcatf(args, sizeof(args), "filter_type=%d:", (int)ost->swr_filter_type);
731 if (ost->swr_dither_method)
732 av_strlcatf(args, sizeof(args), "dither_method=%d:", (int)ost->swr_dither_method);
733 if (ost->swr_dither_scale != 1.0)
734 av_strlcatf(args, sizeof(args), "dither_scale=%f:", ost->swr_dither_scale);
736 args[strlen(args)-1] = 0;
737 av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
740 if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
743 if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
744 av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
745 "exactly one input and output.\n", graph_desc);
746 return AVERROR(EINVAL);
749 for (cur = inputs; !simple && init && cur; cur = cur->next)
750 init_input_filter(fg, cur);
752 for (cur = inputs, i = 0; cur; cur = cur->next, i++)
753 if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
755 avfilter_inout_free(&inputs);
757 if (!init || simple) {
758 /* we already know the mappings between lavfi outputs and output streams,
759 * so we can finish the setup */
760 for (cur = outputs, i = 0; cur; cur = cur->next, i++)
761 configure_output_filter(fg, fg->outputs[i], cur);
762 avfilter_inout_free(&outputs);
764 if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
767 /* wait until output mappings are processed */
768 for (cur = outputs; cur;) {
769 GROW_ARRAY(fg->outputs, fg->nb_outputs);
770 if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
772 fg->outputs[fg->nb_outputs - 1]->graph = fg;
773 fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
775 fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
782 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
785 for (i = 0; i < fg->nb_inputs; i++)
786 if (fg->inputs[i]->ist == ist)