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/audioconvert.h"
28 #include "libavutil/avassert.h"
29 #include "libavutil/avstring.h"
30 #include "libavutil/bprint.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 int has_alpha= av_pix_fmt_descriptors[target].nb_components % 2 == 0;
41 enum AVPixelFormat best= AV_PIX_FMT_NONE;
42 if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
43 if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
44 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
45 } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
46 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
47 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
50 for (; *p != AV_PIX_FMT_NONE; p++) {
51 best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
55 if (*p == AV_PIX_FMT_NONE) {
56 if (target != AV_PIX_FMT_NONE)
57 av_log(NULL, AV_LOG_WARNING,
58 "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
59 av_pix_fmt_descriptors[target].name,
61 av_pix_fmt_descriptors[best].name);
68 void choose_sample_fmt(AVStream *st, AVCodec *codec)
70 if (codec && codec->sample_fmts) {
71 const enum AVSampleFormat *p = codec->sample_fmts;
72 for (; *p != -1; p++) {
73 if (*p == st->codec->sample_fmt)
77 if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
78 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
79 if(av_get_sample_fmt_name(st->codec->sample_fmt))
80 av_log(NULL, AV_LOG_WARNING,
81 "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
82 av_get_sample_fmt_name(st->codec->sample_fmt),
84 av_get_sample_fmt_name(codec->sample_fmts[0]));
85 st->codec->sample_fmt = codec->sample_fmts[0];
90 static char *choose_pix_fmts(OutputStream *ost)
92 if (ost->keep_pix_fmt) {
94 avfilter_graph_set_auto_convert(ost->filter->graph->graph,
95 AVFILTER_AUTO_CONVERT_NONE);
96 if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
98 return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
100 if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
101 return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
102 } else if (ost->enc && ost->enc->pix_fmts) {
103 const enum AVPixelFormat *p;
104 AVIOContext *s = NULL;
108 if (avio_open_dyn_buf(&s) < 0)
111 p = ost->enc->pix_fmts;
112 if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
113 if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
114 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
115 } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
116 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
117 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
121 for (; *p != AV_PIX_FMT_NONE; p++) {
122 const char *name = av_get_pix_fmt_name(*p);
123 avio_printf(s, "%s:", name);
125 len = avio_close_dyn_buf(s, &ret);
132 /* Define a function for building a string containing a list of
133 * allowed formats. */
134 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name, separator)\
135 static char *choose_ ## var ## s(OutputStream *ost) \
137 if (ost->st->codec->var != none) { \
138 get_name(ost->st->codec->var); \
139 return av_strdup(name); \
140 } else if (ost->enc->supported_list) { \
142 AVIOContext *s = NULL; \
146 if (avio_open_dyn_buf(&s) < 0) \
149 for (p = ost->enc->supported_list; *p != none; p++) { \
151 avio_printf(s, "%s" separator, name); \
153 len = avio_close_dyn_buf(s, &ret); \
160 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
161 // GET_PIX_FMT_NAME, ":")
163 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
164 AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME, ",")
166 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
167 GET_SAMPLE_RATE_NAME, ",")
169 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
170 GET_CH_LAYOUT_NAME, ",")
172 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
174 FilterGraph *fg = av_mallocz(sizeof(*fg));
178 fg->index = nb_filtergraphs;
180 fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs), &fg->nb_outputs,
182 if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
184 fg->outputs[0]->ost = ost;
185 fg->outputs[0]->graph = fg;
187 ost->filter = fg->outputs[0];
189 fg->inputs = grow_array(fg->inputs, sizeof(*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 ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
197 &ist->nb_filters, ist->nb_filters + 1);
198 ist->filters[ist->nb_filters - 1] = fg->inputs[0];
200 filtergraphs = grow_array(filtergraphs, sizeof(*filtergraphs),
201 &nb_filtergraphs, nb_filtergraphs + 1);
202 filtergraphs[nb_filtergraphs - 1] = fg;
207 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
209 InputStream *ist = NULL;
210 enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
213 // TODO: support other filter types
214 if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
215 av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
224 int file_idx = strtol(in->name, &p, 0);
226 if (file_idx < 0 || file_idx >= nb_input_files) {
227 av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
228 file_idx, fg->graph_desc);
231 s = input_files[file_idx]->ctx;
233 for (i = 0; i < s->nb_streams; i++) {
234 enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
235 if (stream_type != type &&
236 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
237 type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
239 if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
245 av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
246 "matches no streams.\n", p, fg->graph_desc);
249 ist = input_streams[input_files[file_idx]->ist_index + st->index];
251 /* find the first unused stream of corresponding type */
252 for (i = 0; i < nb_input_streams; i++) {
253 ist = input_streams[i];
254 if (ist->st->codec->codec_type == type && ist->discard)
257 if (i == nb_input_streams) {
258 av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
259 "unlabeled input pad %d on filter %s\n", in->pad_idx,
260 in->filter_ctx->name);
267 ist->decoding_needed++;
268 ist->st->discard = AVDISCARD_NONE;
270 fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs),
271 &fg->nb_inputs, fg->nb_inputs + 1);
272 if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
274 fg->inputs[fg->nb_inputs - 1]->ist = ist;
275 fg->inputs[fg->nb_inputs - 1]->graph = fg;
277 ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
278 &ist->nb_filters, ist->nb_filters + 1);
279 ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
282 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
285 OutputStream *ost = ofilter->ost;
286 AVCodecContext *codec = ost->st->codec;
287 AVFilterContext *last_filter = out->filter_ctx;
288 int pad_idx = out->pad_idx;
291 AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc();
293 snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
294 ret = avfilter_graph_create_filter(&ofilter->filter,
295 avfilter_get_by_name("ffbuffersink"),
296 name, NULL, NULL, fg->graph);
297 av_freep(&buffersink_params);
302 if (codec->width || codec->height) {
304 AVFilterContext *filter;
306 snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
309 (unsigned)ost->sws_flags);
310 snprintf(name, sizeof(name), "scaler for output stream %d:%d",
311 ost->file_index, ost->index);
312 if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
313 name, args, NULL, fg->graph)) < 0)
315 if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
318 last_filter = filter;
322 if ((pix_fmts = choose_pix_fmts(ost))) {
323 AVFilterContext *filter;
324 snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
325 ost->file_index, ost->index);
326 if ((ret = avfilter_graph_create_filter(&filter,
327 avfilter_get_by_name("format"),
328 "format", pix_fmts, NULL,
331 if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
334 last_filter = filter;
339 if (ost->frame_rate.num && 0) {
340 AVFilterContext *fps;
343 snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
344 ost->frame_rate.den);
345 snprintf(name, sizeof(name), "fps for output stream %d:%d",
346 ost->file_index, ost->index);
347 ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
348 name, args, NULL, fg->graph);
352 ret = avfilter_link(last_filter, pad_idx, fps, 0);
359 if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
365 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
367 OutputStream *ost = ofilter->ost;
368 AVCodecContext *codec = ost->st->codec;
369 AVFilterContext *last_filter = out->filter_ctx;
370 int pad_idx = out->pad_idx;
371 char *sample_fmts, *sample_rates, *channel_layouts;
376 snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
377 ret = avfilter_graph_create_filter(&ofilter->filter,
378 avfilter_get_by_name("ffabuffersink"),
379 name, NULL, NULL, fg->graph);
383 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do { \
384 AVFilterContext *filt_ctx; \
386 av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \
387 "similarly to -af " filter_name "=%s.\n", arg); \
389 ret = avfilter_graph_create_filter(&filt_ctx, \
390 avfilter_get_by_name(filter_name), \
391 filter_name, arg, NULL, fg->graph); \
395 ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0); \
399 last_filter = filt_ctx; \
402 if (ost->audio_channels_mapped) {
405 av_bprint_init(&pan_buf, 256, 8192);
406 av_bprintf(&pan_buf, "0x%"PRIx64,
407 av_get_default_channel_layout(ost->audio_channels_mapped));
408 for (i = 0; i < ost->audio_channels_mapped; i++)
409 if (ost->audio_channels_map[i] != -1)
410 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
412 AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
413 av_bprint_finalize(&pan_buf, NULL);
416 if (codec->channels && !codec->channel_layout)
417 codec->channel_layout = av_get_default_channel_layout(codec->channels);
419 sample_fmts = choose_sample_fmts(ost);
420 sample_rates = choose_sample_rates(ost);
421 channel_layouts = choose_channel_layouts(ost);
422 if (sample_fmts || sample_rates || channel_layouts) {
423 AVFilterContext *format;
428 av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
431 av_strlcatf(args, sizeof(args), "sample_rates=%s:",
434 av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
437 av_freep(&sample_fmts);
438 av_freep(&sample_rates);
439 av_freep(&channel_layouts);
441 snprintf(name, sizeof(name), "audio format for output stream %d:%d",
442 ost->file_index, ost->index);
443 ret = avfilter_graph_create_filter(&format,
444 avfilter_get_by_name("aformat"),
445 name, args, NULL, fg->graph);
449 ret = avfilter_link(last_filter, pad_idx, format, 0);
453 last_filter = format;
457 if (audio_volume != 256 && 0) {
460 snprintf(args, sizeof(args), "%f", audio_volume / 256.);
461 AUTO_INSERT_FILTER("-vol", "volume", args);
464 if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
470 #define DESCRIBE_FILTER_LINK(f, inout, in) \
472 AVFilterContext *ctx = inout->filter_ctx; \
473 AVFilterPad *pads = in ? ctx->input_pads : ctx->output_pads; \
474 int nb_pads = in ? ctx->input_count : ctx->output_count; \
477 if (avio_open_dyn_buf(&pb) < 0) \
480 avio_printf(pb, "%s", ctx->filter->name); \
482 avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
484 avio_close_dyn_buf(pb, &f->name); \
487 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
489 av_freep(&ofilter->name);
490 DESCRIBE_FILTER_LINK(ofilter, out, 0);
492 switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
493 case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
494 case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
495 default: av_assert0(0);
499 static int sub2video_prepare(InputStream *ist)
501 AVFormatContext *avf = input_files[ist->file_index]->ctx;
506 /* Compute the size of the canvas for the subtitles stream.
507 If the subtitles codec has set a size, use it. Otherwise use the
508 maximum dimensions of the video streams in the same file. */
509 w = ist->st->codec->width;
510 h = ist->st->codec->height;
512 for (i = 0; i < avf->nb_streams; i++) {
513 if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
514 w = FFMAX(w, avf->streams[i]->codec->width);
515 h = FFMAX(h, avf->streams[i]->codec->height);
522 av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
524 ist->sub2video.w = ist->st->codec->width = w;
525 ist->sub2video.h = ist->st->codec->height = h;
527 /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
528 palettes for all rectangles are identical or compatible */
529 ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
531 ret = av_image_alloc(image, linesize, w, h, AV_PIX_FMT_RGB32, 32);
534 memset(image[0], 0, h * linesize[0]);
535 ist->sub2video.ref = avfilter_get_video_buffer_ref_from_arrays(
536 image, linesize, AV_PERM_READ | AV_PERM_PRESERVE,
537 w, h, AV_PIX_FMT_RGB32);
538 if (!ist->sub2video.ref) {
540 return AVERROR(ENOMEM);
545 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
548 AVFilterContext *first_filter = in->filter_ctx;
549 AVFilter *filter = avfilter_get_by_name("buffer");
550 InputStream *ist = ifilter->ist;
551 AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
553 AVRational fr = ist->framerate.num ? ist->framerate :
554 ist->st->r_frame_rate;
558 int pad_idx = in->pad_idx;
561 if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
562 ret = sub2video_prepare(ist);
567 sar = ist->st->sample_aspect_ratio.num ?
568 ist->st->sample_aspect_ratio :
569 ist->st->codec->sample_aspect_ratio;
571 sar = (AVRational){0,1};
572 av_bprint_init(&args, 0, 1);
574 "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
575 "pixel_aspect=%d/%d:sws_param=flags=%d", ist->st->codec->width,
576 ist->st->codec->height, ist->st->codec->pix_fmt,
577 tb.num, tb.den, sar.num, sar.den,
578 SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
579 if (fr.num && fr.den)
580 av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
581 snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
582 ist->file_index, ist->st->index);
584 if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
585 args.str, NULL, fg->graph)) < 0)
588 if (ist->framerate.num) {
589 AVFilterContext *setpts;
591 snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
592 ist->file_index, ist->st->index);
593 if ((ret = avfilter_graph_create_filter(&setpts,
594 avfilter_get_by_name("setpts"),
599 if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
602 first_filter = setpts;
606 if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
611 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
614 AVFilterContext *first_filter = in->filter_ctx;
615 AVFilter *filter = avfilter_get_by_name("abuffer");
616 InputStream *ist = ifilter->ist;
617 int pad_idx = in->pad_idx;
618 char args[255], name[255];
621 snprintf(args, sizeof(args), "time_base=%d/%d:sample_rate=%d:sample_fmt=%s"
622 ":channel_layout=0x%"PRIx64,
623 1, ist->st->codec->sample_rate,
624 ist->st->codec->sample_rate,
625 av_get_sample_fmt_name(ist->st->codec->sample_fmt),
626 ist->st->codec->channel_layout);
627 snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
628 ist->file_index, ist->st->index);
630 if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
635 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do { \
636 AVFilterContext *filt_ctx; \
638 av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \
639 "similarly to -af " filter_name "=%s.\n", arg); \
641 snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d", \
642 fg->index, filter_name, ist->file_index, ist->st->index); \
643 ret = avfilter_graph_create_filter(&filt_ctx, \
644 avfilter_get_by_name(filter_name), \
645 name, arg, NULL, fg->graph); \
649 ret = avfilter_link(filt_ctx, 0, first_filter, pad_idx); \
653 first_filter = filt_ctx; \
656 if (audio_sync_method > 0) {
657 char args[256] = {0};
659 av_strlcatf(args, sizeof(args), "min_comp=0.001:min_hard_comp=%f", audio_drift_threshold);
660 if (audio_sync_method > 1)
661 av_strlcatf(args, sizeof(args), ":max_soft_comp=%f", audio_sync_method/(double)ist->st->codec->sample_rate);
662 AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
665 // if (ost->audio_channels_mapped) {
668 // av_bprint_init(&pan_buf, 256, 8192);
669 // av_bprintf(&pan_buf, "0x%"PRIx64,
670 // av_get_default_channel_layout(ost->audio_channels_mapped));
671 // for (i = 0; i < ost->audio_channels_mapped; i++)
672 // if (ost->audio_channels_map[i] != -1)
673 // av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
674 // AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
675 // av_bprint_finalize(&pan_buf, NULL);
678 if (audio_volume != 256) {
681 snprintf(args, sizeof(args), "%f", audio_volume / 256.);
682 AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
684 if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
690 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
693 av_freep(&ifilter->name);
694 DESCRIBE_FILTER_LINK(ifilter, in, 1);
696 switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
697 case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
698 case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
699 default: av_assert0(0);
703 int configure_filtergraph(FilterGraph *fg)
705 AVFilterInOut *inputs, *outputs, *cur;
706 int ret, i, init = !fg->graph, simple = !fg->graph_desc;
707 const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
710 avfilter_graph_free(&fg->graph);
711 if (!(fg->graph = avfilter_graph_alloc()))
712 return AVERROR(ENOMEM);
715 OutputStream *ost = fg->outputs[0]->ost;
717 snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
718 fg->graph->scale_sws_opts = av_strdup(args);
721 if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
724 if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
725 av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
726 "exactly one input and output.\n", graph_desc);
727 return AVERROR(EINVAL);
730 for (cur = inputs; !simple && init && cur; cur = cur->next)
731 init_input_filter(fg, cur);
733 for (cur = inputs, i = 0; cur; cur = cur->next, i++)
734 if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
736 avfilter_inout_free(&inputs);
738 if (!init || simple) {
739 /* we already know the mappings between lavfi outputs and output streams,
740 * so we can finish the setup */
741 for (cur = outputs, i = 0; cur; cur = cur->next, i++)
742 configure_output_filter(fg, fg->outputs[i], cur);
743 avfilter_inout_free(&outputs);
745 if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
748 /* wait until output mappings are processed */
749 for (cur = outputs; cur;) {
750 fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs),
751 &fg->nb_outputs, fg->nb_outputs + 1);
752 if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
754 fg->outputs[fg->nb_outputs - 1]->graph = fg;
755 fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
757 fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
764 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
767 for (i = 0; i < fg->nb_inputs; i++)
768 if (fg->inputs[i]->ist == ist)