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/pixdesc.h"
32 #include "libavutil/pixfmt.h"
33 #include "libavutil/imgutils.h"
34 #include "libavutil/samplefmt.h"
36 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFormat target)
38 if (codec && codec->pix_fmts) {
39 const enum AVPixelFormat *p = codec->pix_fmts;
40 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
41 int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
42 enum AVPixelFormat best= AV_PIX_FMT_NONE;
43 if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
44 if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
45 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
46 } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
47 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
48 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
51 for (; *p != AV_PIX_FMT_NONE; p++) {
52 best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
56 if (*p == AV_PIX_FMT_NONE) {
57 if (target != AV_PIX_FMT_NONE)
58 av_log(NULL, AV_LOG_WARNING,
59 "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
60 av_get_pix_fmt_name(target),
62 av_get_pix_fmt_name(best));
69 void choose_sample_fmt(AVStream *st, AVCodec *codec)
71 if (codec && codec->sample_fmts) {
72 const enum AVSampleFormat *p = codec->sample_fmts;
73 for (; *p != -1; p++) {
74 if (*p == st->codec->sample_fmt)
78 if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
79 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
80 if(av_get_sample_fmt_name(st->codec->sample_fmt))
81 av_log(NULL, AV_LOG_WARNING,
82 "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
83 av_get_sample_fmt_name(st->codec->sample_fmt),
85 av_get_sample_fmt_name(codec->sample_fmts[0]));
86 st->codec->sample_fmt = codec->sample_fmts[0];
91 static char *choose_pix_fmts(OutputStream *ost)
93 if (ost->keep_pix_fmt) {
95 avfilter_graph_set_auto_convert(ost->filter->graph->graph,
96 AVFILTER_AUTO_CONVERT_NONE);
97 if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
99 return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
101 if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
102 return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
103 } else if (ost->enc && ost->enc->pix_fmts) {
104 const enum AVPixelFormat *p;
105 AVIOContext *s = NULL;
109 if (avio_open_dyn_buf(&s) < 0)
112 p = ost->enc->pix_fmts;
113 if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
114 if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
115 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
116 } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
117 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
118 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
122 for (; *p != AV_PIX_FMT_NONE; p++) {
123 const char *name = av_get_pix_fmt_name(*p);
124 avio_printf(s, "%s:", name);
126 len = avio_close_dyn_buf(s, &ret);
133 /* Define a function for building a string containing a list of
134 * allowed formats. */
135 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name, separator)\
136 static char *choose_ ## var ## s(OutputStream *ost) \
138 if (ost->st->codec->var != none) { \
139 get_name(ost->st->codec->var); \
140 return av_strdup(name); \
141 } else if (ost->enc->supported_list) { \
143 AVIOContext *s = NULL; \
147 if (avio_open_dyn_buf(&s) < 0) \
150 for (p = ost->enc->supported_list; *p != none; p++) { \
152 avio_printf(s, "%s" separator, name); \
154 len = avio_close_dyn_buf(s, &ret); \
161 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
162 // GET_PIX_FMT_NAME, ":")
164 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
165 AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME, ",")
167 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
168 GET_SAMPLE_RATE_NAME, ",")
170 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
171 GET_CH_LAYOUT_NAME, ",")
173 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
175 FilterGraph *fg = av_mallocz(sizeof(*fg));
179 fg->index = nb_filtergraphs;
181 fg->outputs = grow_array(fg->outputs, sizeof(*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 fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs), &fg->nb_inputs,
192 if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
194 fg->inputs[0]->ist = ist;
195 fg->inputs[0]->graph = fg;
197 ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
198 &ist->nb_filters, ist->nb_filters + 1);
199 ist->filters[ist->nb_filters - 1] = fg->inputs[0];
201 filtergraphs = grow_array(filtergraphs, sizeof(*filtergraphs),
202 &nb_filtergraphs, nb_filtergraphs + 1);
203 filtergraphs[nb_filtergraphs - 1] = fg;
208 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
210 InputStream *ist = NULL;
211 enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
214 // TODO: support other filter types
215 if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
216 av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
225 int file_idx = strtol(in->name, &p, 0);
227 if (file_idx < 0 || file_idx >= nb_input_files) {
228 av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
229 file_idx, fg->graph_desc);
232 s = input_files[file_idx]->ctx;
234 for (i = 0; i < s->nb_streams; i++) {
235 enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
236 if (stream_type != type &&
237 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
238 type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
240 if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
246 av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
247 "matches no streams.\n", p, fg->graph_desc);
250 ist = input_streams[input_files[file_idx]->ist_index + st->index];
252 /* find the first unused stream of corresponding type */
253 for (i = 0; i < nb_input_streams; i++) {
254 ist = input_streams[i];
255 if (ist->st->codec->codec_type == type && ist->discard)
258 if (i == nb_input_streams) {
259 av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
260 "unlabeled input pad %d on filter %s\n", in->pad_idx,
261 in->filter_ctx->name);
268 ist->decoding_needed++;
269 ist->st->discard = AVDISCARD_NONE;
271 fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs),
272 &fg->nb_inputs, fg->nb_inputs + 1);
273 if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
275 fg->inputs[fg->nb_inputs - 1]->ist = ist;
276 fg->inputs[fg->nb_inputs - 1]->graph = fg;
278 ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
279 &ist->nb_filters, ist->nb_filters + 1);
280 ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
283 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
286 OutputStream *ost = ofilter->ost;
287 AVCodecContext *codec = ost->st->codec;
288 AVFilterContext *last_filter = out->filter_ctx;
289 int pad_idx = out->pad_idx;
292 AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc();
294 snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
295 ret = avfilter_graph_create_filter(&ofilter->filter,
296 avfilter_get_by_name("ffbuffersink"),
297 name, NULL, NULL, fg->graph);
298 av_freep(&buffersink_params);
303 if (codec->width || codec->height) {
305 AVFilterContext *filter;
307 snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
310 (unsigned)ost->sws_flags);
311 snprintf(name, sizeof(name), "scaler for output stream %d:%d",
312 ost->file_index, ost->index);
313 if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
314 name, args, NULL, fg->graph)) < 0)
316 if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
319 last_filter = filter;
323 if ((pix_fmts = choose_pix_fmts(ost))) {
324 AVFilterContext *filter;
325 snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
326 ost->file_index, ost->index);
327 if ((ret = avfilter_graph_create_filter(&filter,
328 avfilter_get_by_name("format"),
329 "format", pix_fmts, NULL,
332 if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
335 last_filter = filter;
340 if (ost->frame_rate.num && 0) {
341 AVFilterContext *fps;
344 snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
345 ost->frame_rate.den);
346 snprintf(name, sizeof(name), "fps for output stream %d:%d",
347 ost->file_index, ost->index);
348 ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
349 name, args, NULL, fg->graph);
353 ret = avfilter_link(last_filter, pad_idx, fps, 0);
360 if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
366 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
368 OutputStream *ost = ofilter->ost;
369 AVCodecContext *codec = ost->st->codec;
370 AVFilterContext *last_filter = out->filter_ctx;
371 int pad_idx = out->pad_idx;
372 char *sample_fmts, *sample_rates, *channel_layouts;
377 snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
378 ret = avfilter_graph_create_filter(&ofilter->filter,
379 avfilter_get_by_name("ffabuffersink"),
380 name, NULL, NULL, fg->graph);
384 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do { \
385 AVFilterContext *filt_ctx; \
387 av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \
388 "similarly to -af " filter_name "=%s.\n", arg); \
390 ret = avfilter_graph_create_filter(&filt_ctx, \
391 avfilter_get_by_name(filter_name), \
392 filter_name, arg, NULL, fg->graph); \
396 ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0); \
400 last_filter = filt_ctx; \
403 if (ost->audio_channels_mapped) {
406 av_bprint_init(&pan_buf, 256, 8192);
407 av_bprintf(&pan_buf, "0x%"PRIx64,
408 av_get_default_channel_layout(ost->audio_channels_mapped));
409 for (i = 0; i < ost->audio_channels_mapped; i++)
410 if (ost->audio_channels_map[i] != -1)
411 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
413 AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
414 av_bprint_finalize(&pan_buf, NULL);
417 if (codec->channels && !codec->channel_layout)
418 codec->channel_layout = av_get_default_channel_layout(codec->channels);
420 sample_fmts = choose_sample_fmts(ost);
421 sample_rates = choose_sample_rates(ost);
422 channel_layouts = choose_channel_layouts(ost);
423 if (sample_fmts || sample_rates || channel_layouts) {
424 AVFilterContext *format;
429 av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
432 av_strlcatf(args, sizeof(args), "sample_rates=%s:",
435 av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
438 av_freep(&sample_fmts);
439 av_freep(&sample_rates);
440 av_freep(&channel_layouts);
442 snprintf(name, sizeof(name), "audio format for output stream %d:%d",
443 ost->file_index, ost->index);
444 ret = avfilter_graph_create_filter(&format,
445 avfilter_get_by_name("aformat"),
446 name, args, NULL, fg->graph);
450 ret = avfilter_link(last_filter, pad_idx, format, 0);
454 last_filter = format;
458 if (audio_volume != 256 && 0) {
461 snprintf(args, sizeof(args), "%f", audio_volume / 256.);
462 AUTO_INSERT_FILTER("-vol", "volume", args);
465 if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
471 #define DESCRIBE_FILTER_LINK(f, inout, in) \
473 AVFilterContext *ctx = inout->filter_ctx; \
474 AVFilterPad *pads = in ? ctx->input_pads : ctx->output_pads; \
475 int nb_pads = in ? ctx->input_count : ctx->output_count; \
478 if (avio_open_dyn_buf(&pb) < 0) \
481 avio_printf(pb, "%s", ctx->filter->name); \
483 avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
485 avio_close_dyn_buf(pb, &f->name); \
488 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
490 av_freep(&ofilter->name);
491 DESCRIBE_FILTER_LINK(ofilter, out, 0);
493 switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
494 case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
495 case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
496 default: av_assert0(0);
500 static int sub2video_prepare(InputStream *ist)
502 AVFormatContext *avf = input_files[ist->file_index]->ctx;
507 /* Compute the size of the canvas for the subtitles stream.
508 If the subtitles codec has set a size, use it. Otherwise use the
509 maximum dimensions of the video streams in the same file. */
510 w = ist->st->codec->width;
511 h = ist->st->codec->height;
513 for (i = 0; i < avf->nb_streams; i++) {
514 if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
515 w = FFMAX(w, avf->streams[i]->codec->width);
516 h = FFMAX(h, avf->streams[i]->codec->height);
523 av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
525 ist->sub2video.w = ist->st->codec->width = w;
526 ist->sub2video.h = ist->st->codec->height = h;
528 /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
529 palettes for all rectangles are identical or compatible */
530 ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
532 ret = av_image_alloc(image, linesize, w, h, AV_PIX_FMT_RGB32, 32);
535 memset(image[0], 0, h * linesize[0]);
536 ist->sub2video.ref = avfilter_get_video_buffer_ref_from_arrays(
537 image, linesize, AV_PERM_READ | AV_PERM_PRESERVE,
538 w, h, AV_PIX_FMT_RGB32);
539 if (!ist->sub2video.ref) {
541 return AVERROR(ENOMEM);
546 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
549 AVFilterContext *first_filter = in->filter_ctx;
550 AVFilter *filter = avfilter_get_by_name("buffer");
551 InputStream *ist = ifilter->ist;
552 AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
554 AVRational fr = ist->framerate.num ? ist->framerate :
555 ist->st->r_frame_rate;
559 int pad_idx = in->pad_idx;
562 if (!ist->framerate.num && ist->st->codec->ticks_per_frame>1) {
563 AVRational codec_fr = av_inv_q(ist->st->codec->time_base);
564 codec_fr.den *= ist->st->codec->ticks_per_frame;
565 if(codec_fr.num>0 && codec_fr.den>0 && av_q2d(codec_fr) < av_q2d(fr)*0.7)
569 if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
570 ret = sub2video_prepare(ist);
575 sar = ist->st->sample_aspect_ratio.num ?
576 ist->st->sample_aspect_ratio :
577 ist->st->codec->sample_aspect_ratio;
579 sar = (AVRational){0,1};
580 av_bprint_init(&args, 0, 1);
582 "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
583 "pixel_aspect=%d/%d:sws_param=flags=%d", ist->st->codec->width,
584 ist->st->codec->height, ist->st->codec->pix_fmt,
585 tb.num, tb.den, sar.num, sar.den,
586 SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
587 if (fr.num && fr.den)
588 av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
589 snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
590 ist->file_index, ist->st->index);
592 if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
593 args.str, NULL, fg->graph)) < 0)
596 if (ist->framerate.num) {
597 AVFilterContext *setpts;
599 snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
600 ist->file_index, ist->st->index);
601 if ((ret = avfilter_graph_create_filter(&setpts,
602 avfilter_get_by_name("setpts"),
607 if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
610 first_filter = setpts;
614 if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
619 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
622 AVFilterContext *first_filter = in->filter_ctx;
623 AVFilter *filter = avfilter_get_by_name("abuffer");
624 InputStream *ist = ifilter->ist;
625 int pad_idx = in->pad_idx;
626 char args[255], name[255];
629 snprintf(args, sizeof(args), "time_base=%d/%d:sample_rate=%d:sample_fmt=%s"
630 ":channel_layout=0x%"PRIx64,
631 1, ist->st->codec->sample_rate,
632 ist->st->codec->sample_rate,
633 av_get_sample_fmt_name(ist->st->codec->sample_fmt),
634 ist->st->codec->channel_layout);
635 snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
636 ist->file_index, ist->st->index);
638 if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
643 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do { \
644 AVFilterContext *filt_ctx; \
646 av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \
647 "similarly to -af " filter_name "=%s.\n", arg); \
649 snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d", \
650 fg->index, filter_name, ist->file_index, ist->st->index); \
651 ret = avfilter_graph_create_filter(&filt_ctx, \
652 avfilter_get_by_name(filter_name), \
653 name, arg, NULL, fg->graph); \
657 ret = avfilter_link(filt_ctx, 0, first_filter, pad_idx); \
661 first_filter = filt_ctx; \
664 if (audio_sync_method > 0) {
665 char args[256] = {0};
667 av_strlcatf(args, sizeof(args), "min_comp=0.001:min_hard_comp=%f", audio_drift_threshold);
668 if (audio_sync_method > 1)
669 av_strlcatf(args, sizeof(args), ":max_soft_comp=%f", audio_sync_method/(double)ist->st->codec->sample_rate);
670 AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
673 // if (ost->audio_channels_mapped) {
676 // av_bprint_init(&pan_buf, 256, 8192);
677 // av_bprintf(&pan_buf, "0x%"PRIx64,
678 // av_get_default_channel_layout(ost->audio_channels_mapped));
679 // for (i = 0; i < ost->audio_channels_mapped; i++)
680 // if (ost->audio_channels_map[i] != -1)
681 // av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
682 // AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
683 // av_bprint_finalize(&pan_buf, NULL);
686 if (audio_volume != 256) {
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 ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
732 if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
733 av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
734 "exactly one input and output.\n", graph_desc);
735 return AVERROR(EINVAL);
738 for (cur = inputs; !simple && init && cur; cur = cur->next)
739 init_input_filter(fg, cur);
741 for (cur = inputs, i = 0; cur; cur = cur->next, i++)
742 if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
744 avfilter_inout_free(&inputs);
746 if (!init || simple) {
747 /* we already know the mappings between lavfi outputs and output streams,
748 * so we can finish the setup */
749 for (cur = outputs, i = 0; cur; cur = cur->next, i++)
750 configure_output_filter(fg, fg->outputs[i], cur);
751 avfilter_inout_free(&outputs);
753 if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
756 /* wait until output mappings are processed */
757 for (cur = outputs; cur;) {
758 fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs),
759 &fg->nb_outputs, fg->nb_outputs + 1);
760 if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
762 fg->outputs[fg->nb_outputs - 1]->graph = fg;
763 fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
765 fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
772 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
775 for (i = 0; i < fg->nb_inputs; i++)
776 if (fg->inputs[i]->ist == ist)