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f_lavfi.c
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f_lavfi.c
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/*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <inttypes.h>
#include <stdarg.h>
#include <assert.h>
#include <libavutil/avstring.h>
#include <libavutil/mem.h>
#include <libavutil/mathematics.h>
#include <libavutil/rational.h>
#include <libavutil/error.h>
#include <libavutil/opt.h>
#include <libavfilter/avfilter.h>
#include <libavfilter/buffersink.h>
#include <libavfilter/buffersrc.h>
#include <libplacebo/utils/libav.h>
#include "config.h"
#include "common/common.h"
#include "common/av_common.h"
#include "common/tags.h"
#include "common/msg.h"
#include "audio/format.h"
#include "audio/aframe.h"
#include "audio/chmap_avchannel.h"
#include "video/mp_image.h"
#include "audio/fmt-conversion.h"
#include "video/fmt-conversion.h"
#include "video/hwdec.h"
#include "video/out/gpu/hwdec.h"
#include "f_lavfi.h"
#include "filter.h"
#include "filter_internal.h"
#include "user_filters.h"
struct lavfi {
struct mp_log *log;
struct mp_filter *f;
char *graph_string;
char **graph_opts;
bool force_bidir;
enum mp_frame_type force_type;
bool direct_filter;
char **direct_filter_opts;
AVFilterGraph *graph;
// Set to true once all inputs have been initialized, and the graph is
// linked.
bool initialized;
bool warned_nospeed;
// Graph is draining to either handle format changes (if input format
// changes for one pad, recreate the graph after draining all buffered
// frames), or undo previously sent EOF (libavfilter does not accept
// input anymore after sending EOF, so recreate the graph to "unstuck" it).
bool draining_recover;
// Filter can't be put into a working state.
bool failed;
struct lavfi_pad **in_pads;
int num_in_pads;
struct lavfi_pad **out_pads;
int num_out_pads;
struct lavfi_pad **all_pads;
int num_all_pads;
AVFrame *tmp_frame;
// Audio timestamp emulation.
bool emulate_audio_pts;
double in_pts; // last input timestamps
int64_t in_samples; // samples ever sent to the filter
double delay; // seconds of audio apparently buffered by filter
struct mp_lavfi public;
// Identify a specific hwdec_interop to use
char *hwdec_interop;
};
struct lavfi_pad {
struct lavfi *main;
enum mp_frame_type type;
enum mp_pin_dir dir;
char *name; // user-given pad name
struct mp_pin *pin; // internal pin for this (never NULL once initialized)
int pin_index;
AVFilterContext *filter;
int filter_pad;
// buffersrc or buffersink connected to filter/filter_pad
AVFilterContext *buffer;
AVRational timebase;
bool buffer_is_eof; // received/sent EOF to the buffer
bool got_eagain;
struct mp_tags *metadata;
// 1-frame queue for input.
struct mp_frame pending;
// Used to check input format changes.
struct mp_frame in_fmt;
};
// Free the libavfilter graph (not c), reset all state.
// Does not free pending data intentionally.
static void free_graph(struct lavfi *c)
{
avfilter_graph_free(&c->graph);
for (int n = 0; n < c->num_all_pads; n++) {
struct lavfi_pad *pad = c->all_pads[n];
pad->filter = NULL;
pad->filter_pad = -1;
pad->buffer = NULL;
mp_frame_unref(&pad->in_fmt);
pad->buffer_is_eof = false;
pad->got_eagain = false;
}
c->initialized = false;
c->draining_recover = false;
c->in_pts = MP_NOPTS_VALUE;
c->in_samples = 0;
c->delay = 0;
}
static void add_pad(struct lavfi *c, int dir, int index, AVFilterContext *filter,
int filter_pad, const char *name, bool first_init)
{
if (c->failed)
return;
enum AVMediaType avmt;
if (dir == MP_PIN_IN) {
avmt = avfilter_pad_get_type(filter->input_pads, filter_pad);
} else {
avmt = avfilter_pad_get_type(filter->output_pads, filter_pad);
}
int type;
switch (avmt) {
case AVMEDIA_TYPE_VIDEO: type = MP_FRAME_VIDEO; break;
case AVMEDIA_TYPE_AUDIO: type = MP_FRAME_AUDIO; break;
default:
MP_FATAL(c, "unknown media type\n");
c->failed = true;
return;
}
// For anonymous pads, just make something up. libavfilter allows duplicate
// pad names (while we don't), so we check for collisions along with normal
// duplicate pads below.
char tmp[80];
const char *dir_string = dir == MP_PIN_IN ? "in" : "out";
if (name) {
if (c->direct_filter) {
// libavfilter has this very unpleasant thing that filter labels
// don't have to be unique - in particular, both input and output
// are usually named "default". With direct filters, the user has
// no chance to provide better names, so do something to resolve it.
snprintf(tmp, sizeof(tmp), "%s_%s", name, dir_string);
name = tmp;
}
} else {
snprintf(tmp, sizeof(tmp), "%s%d", dir_string, index);
name = tmp;
}
struct lavfi_pad *p = NULL;
for (int n = 0; n < c->num_all_pads; n++) {
if (strcmp(c->all_pads[n]->name, name) == 0) {
p = c->all_pads[n];
break;
}
}
if (p) {
// Graph recreation case: reassociate an existing pad.
if (p->filter) {
// Collision due to duplicate names.
MP_FATAL(c, "more than one pad with label '%s'\n", name);
c->failed = true;
return;
}
if (p->dir != dir || p->type != type) {
// libavfilter graph parser behavior not deterministic.
MP_FATAL(c, "pad '%s' changed type or direction\n", name);
c->failed = true;
return;
}
} else {
if (!first_init) {
MP_FATAL(c, "filter pad '%s' got added later?\n", name);
c->failed = true;
return;
}
p = talloc_zero(c, struct lavfi_pad);
p->main = c;
p->dir = dir;
p->name = talloc_strdup(p, name);
p->type = type;
p->pin_index = -1;
p->metadata = talloc_zero(p, struct mp_tags);
if (p->dir == MP_PIN_IN)
MP_TARRAY_APPEND(c, c->in_pads, c->num_in_pads, p);
if (p->dir == MP_PIN_OUT)
MP_TARRAY_APPEND(c, c->out_pads, c->num_out_pads, p);
MP_TARRAY_APPEND(c, c->all_pads, c->num_all_pads, p);
}
p->filter = filter;
p->filter_pad = filter_pad;
}
static void add_pads(struct lavfi *c, int dir, AVFilterInOut *l, bool first_init)
{
int index = 0;
for (; l; l = l->next)
add_pad(c, dir, index++, l->filter_ctx, l->pad_idx, l->name, first_init);
}
static void add_pads_direct(struct lavfi *c, int dir, AVFilterContext *f,
AVFilterPad *pads, int num_pads, bool first_init)
{
for (int n = 0; n < num_pads; n++)
add_pad(c, dir, n, f, n, avfilter_pad_get_name(pads, n), first_init);
}
// Parse the user-provided filter graph, and populate the unlinked filter pads.
static void precreate_graph(struct lavfi *c, bool first_init)
{
assert(!c->graph);
c->failed = false;
c->graph = avfilter_graph_alloc();
MP_HANDLE_OOM(c->graph);
if (mp_set_avopts(c->log, c->graph, c->graph_opts) < 0)
goto error;
if (c->direct_filter) {
AVFilterContext *filter = avfilter_graph_alloc_filter(c->graph,
avfilter_get_by_name(c->graph_string), "filter");
if (!filter) {
MP_FATAL(c, "filter '%s' not found or failed to allocate\n",
c->graph_string);
goto error;
}
if (mp_set_avopts_pos(c->log, filter, filter->priv,
c->direct_filter_opts) < 0)
goto error;
if (avfilter_init_str(filter, NULL) < 0) {
MP_FATAL(c, "filter failed to initialize\n");
goto error;
}
add_pads_direct(c, MP_PIN_IN, filter, filter->input_pads,
filter->nb_inputs, first_init);
add_pads_direct(c, MP_PIN_OUT, filter, filter->output_pads,
filter->nb_outputs, first_init);
} else {
AVFilterInOut *in = NULL, *out = NULL;
if (avfilter_graph_parse2(c->graph, c->graph_string, &in, &out) < 0) {
MP_FATAL(c, "parsing the filter graph failed\n");
goto error;
}
add_pads(c, MP_PIN_IN, in, first_init);
add_pads(c, MP_PIN_OUT, out, first_init);
avfilter_inout_free(&in);
avfilter_inout_free(&out);
}
for (int n = 0; n < c->num_all_pads; n++)
c->failed |= !c->all_pads[n]->filter;
if (c->failed)
goto error;
return;
error:
free_graph(c);
c->failed = true;
return;
}
// Ensure to send EOF to each input pad, so the graph can be drained properly.
static void send_global_eof(struct lavfi *c)
{
for (int n = 0; n < c->num_in_pads; n++) {
struct lavfi_pad *pad = c->in_pads[n];
if (!pad->buffer || pad->buffer_is_eof)
continue;
if (av_buffersrc_add_frame(pad->buffer, NULL) < 0)
MP_FATAL(c, "could not send EOF to filter\n");
pad->buffer_is_eof = true;
}
}
// libavfilter allows changing some parameters on the fly, but not
// others.
static bool is_aformat_ok(struct mp_aframe *a, struct mp_aframe *b)
{
struct mp_chmap ca = {0}, cb = {0};
mp_aframe_get_chmap(a, &ca);
mp_aframe_get_chmap(b, &cb);
return mp_chmap_equals(&ca, &cb) &&
mp_aframe_get_rate(a) == mp_aframe_get_rate(b) &&
mp_aframe_get_format(a) == mp_aframe_get_format(b);
}
static bool is_vformat_ok(struct mp_image *a, struct mp_image *b)
{
return a->imgfmt == b->imgfmt &&
a->w == b->w && a->h && b->h &&
a->params.p_w == b->params.p_w && a->params.p_h == b->params.p_h &&
a->nominal_fps == b->nominal_fps;
}
static bool is_format_ok(struct mp_frame a, struct mp_frame b)
{
if (a.type == b.type && a.type == MP_FRAME_VIDEO)
return is_vformat_ok(a.data, b.data);
if (a.type == b.type && a.type == MP_FRAME_AUDIO)
return is_aformat_ok(a.data, b.data);
return false;
}
static void read_pad_input(struct lavfi *c, struct lavfi_pad *pad)
{
assert(pad->dir == MP_PIN_IN);
if (pad->pending.type || c->draining_recover)
return;
pad->pending = mp_pin_out_read(pad->pin);
if (pad->pending.type && pad->pending.type != MP_FRAME_EOF &&
pad->pending.type != pad->type)
{
MP_FATAL(c, "unknown frame %s\n", mp_frame_type_str(pad->pending.type));
mp_frame_unref(&pad->pending);
}
if (mp_frame_is_data(pad->pending) && pad->in_fmt.type &&
!is_format_ok(pad->pending, pad->in_fmt))
{
if (!c->draining_recover)
MP_VERBOSE(c, "format change on %s\n", pad->name);
c->draining_recover = true;
if (c->initialized)
send_global_eof(c);
}
}
// Attempt to initialize all pads. Return true if all are initialized, or
// false if more data is needed (or on error).
static bool init_pads(struct lavfi *c)
{
if (!c->graph)
goto error;
for (int n = 0; n < c->num_out_pads; n++) {
struct lavfi_pad *pad = c->out_pads[n];
if (pad->buffer)
continue;
const AVFilter *dst_filter = NULL;
if (pad->type == MP_FRAME_AUDIO) {
dst_filter = avfilter_get_by_name("abuffersink");
} else if (pad->type == MP_FRAME_VIDEO) {
dst_filter = avfilter_get_by_name("buffersink");
} else {
MP_ASSERT_UNREACHABLE();
}
if (!dst_filter)
goto error;
char name[256];
snprintf(name, sizeof(name), "mpv_sink_%s", pad->name);
if (avfilter_graph_create_filter(&pad->buffer, dst_filter,
name, NULL, NULL, c->graph) < 0)
goto error;
if (avfilter_link(pad->filter, pad->filter_pad, pad->buffer, 0) < 0)
goto error;
}
for (int n = 0; n < c->num_in_pads; n++) {
struct lavfi_pad *pad = c->in_pads[n];
if (pad->buffer)
continue;
mp_frame_unref(&pad->in_fmt);
read_pad_input(c, pad);
// no input data, format unknown, can't init, wait longer.
if (!pad->pending.type)
return false;
if (mp_frame_is_data(pad->pending)) {
assert(pad->pending.type == pad->type);
pad->in_fmt = mp_frame_ref(pad->pending);
if (!pad->in_fmt.type)
goto error;
if (pad->in_fmt.type == MP_FRAME_VIDEO)
mp_image_unref_data(pad->in_fmt.data);
if (pad->in_fmt.type == MP_FRAME_AUDIO)
mp_aframe_unref_data(pad->in_fmt.data);
}
if (pad->pending.type == MP_FRAME_EOF && !pad->in_fmt.type) {
// libavfilter makes this painful. Init it with a dummy config,
// just so we can tell it the stream is EOF.
if (pad->type == MP_FRAME_AUDIO) {
struct mp_aframe *fmt = mp_aframe_create();
mp_aframe_set_format(fmt, AF_FORMAT_FLOAT);
mp_aframe_set_chmap(fmt, &(struct mp_chmap)MP_CHMAP_INIT_STEREO);
mp_aframe_set_rate(fmt, 48000);
pad->in_fmt = (struct mp_frame){MP_FRAME_AUDIO, fmt};
}
if (pad->type == MP_FRAME_VIDEO) {
struct mp_image *fmt = talloc_zero(NULL, struct mp_image);
mp_image_setfmt(fmt, IMGFMT_420P);
mp_image_set_size(fmt, 64, 64);
pad->in_fmt = (struct mp_frame){MP_FRAME_VIDEO, fmt};
}
}
if (pad->in_fmt.type != pad->type)
goto error;
AVBufferSrcParameters *params = av_buffersrc_parameters_alloc();
if (!params)
goto error;
pad->timebase = AV_TIME_BASE_Q;
char *filter_name = NULL;
if (pad->type == MP_FRAME_AUDIO) {
struct mp_aframe *fmt = pad->in_fmt.data;
params->format = af_to_avformat(mp_aframe_get_format(fmt));
params->sample_rate = mp_aframe_get_rate(fmt);
struct mp_chmap chmap = {0};
mp_aframe_get_chmap(fmt, &chmap);
mp_chmap_to_av_layout(¶ms->ch_layout, &chmap);
pad->timebase = (AVRational){1, mp_aframe_get_rate(fmt)};
filter_name = "abuffer";
} else if (pad->type == MP_FRAME_VIDEO) {
struct mp_image *fmt = pad->in_fmt.data;
params->format = imgfmt2pixfmt(fmt->imgfmt);
params->width = fmt->w;
params->height = fmt->h;
params->sample_aspect_ratio.num = fmt->params.p_w;
params->sample_aspect_ratio.den = fmt->params.p_h;
params->hw_frames_ctx = fmt->hwctx;
params->frame_rate = av_d2q(fmt->nominal_fps, 1000000);
#if LIBAVFILTER_VERSION_INT >= AV_VERSION_INT(9, 16, 100)
params->color_space = pl_system_to_av(fmt->params.repr.sys);
params->color_range = pl_levels_to_av(fmt->params.repr.levels);
#endif
filter_name = "buffer";
} else {
MP_ASSERT_UNREACHABLE();
}
params->time_base = pad->timebase;
const AVFilter *filter = avfilter_get_by_name(filter_name);
if (filter) {
char name[256];
snprintf(name, sizeof(name), "mpv_src_%s", pad->name);
pad->buffer = avfilter_graph_alloc_filter(c->graph, filter, name);
}
if (!pad->buffer) {
av_free(params);
goto error;
}
int ret = av_buffersrc_parameters_set(pad->buffer, params);
av_free(params);
if (ret < 0)
goto error;
if (avfilter_init_str(pad->buffer, NULL) < 0)
goto error;
if (avfilter_link(pad->buffer, 0, pad->filter, pad->filter_pad) < 0)
goto error;
}
return true;
error:
MP_FATAL(c, "could not initialize filter pads\n");
c->failed = true;
return false;
}
static void dump_graph(struct lavfi *c)
{
MP_DBG(c, "Filter graph:\n");
char *s = avfilter_graph_dump(c->graph, NULL);
if (s)
MP_DBG(c, "%s\n", s);
av_free(s);
}
// Initialize the graph if all inputs have formats set. If it's already
// initialized, or can't be initialized yet, do nothing.
static void init_graph(struct lavfi *c)
{
assert(!c->initialized);
if (!c->graph)
precreate_graph(c, false);
if (init_pads(c)) {
struct mp_stream_info *info = mp_filter_find_stream_info(c->f);
if (info && info->hwdec_devs) {
struct mp_hwdec_ctx *hwdec_ctx = NULL;
if (c->hwdec_interop) {
int imgfmt =
ra_hwdec_driver_get_imgfmt_for_name(c->hwdec_interop);
enum AVHWDeviceType device_type =
ra_hwdec_driver_get_device_type_for_name(c->hwdec_interop);
hwdec_ctx = mp_filter_load_hwdec_device(c->f, imgfmt, device_type);
} else {
hwdec_ctx = hwdec_devices_get_first(info->hwdec_devs);
}
if (hwdec_ctx && hwdec_ctx->av_device_ref) {
MP_VERBOSE(c, "Configuring hwdec_interop=%s for filter graph: %s\n",
hwdec_ctx->driver_name, c->graph_string);
for (int n = 0; n < c->graph->nb_filters; n++) {
AVFilterContext *filter = c->graph->filters[n];
filter->hw_device_ctx =
av_buffer_ref(hwdec_ctx->av_device_ref);
}
}
}
// And here the actual libavfilter initialization happens.
if (avfilter_graph_config(c->graph, NULL) < 0) {
MP_FATAL(c, "failed to configure the filter graph\n");
free_graph(c);
c->failed = true;
return;
}
// The timebase is available after configuring.
for (int n = 0; n < c->num_out_pads; n++) {
struct lavfi_pad *pad = c->out_pads[n];
pad->timebase = pad->buffer->inputs[0]->time_base;
}
c->initialized = true;
if (!c->direct_filter) // (output uninteresting for direct filters)
dump_graph(c);
}
}
static bool feed_input_pads(struct lavfi *c)
{
bool progress = false;
bool was_draining = c->draining_recover;
assert(c->initialized);
for (int n = 0; n < c->num_in_pads; n++) {
struct lavfi_pad *pad = c->in_pads[n];
bool requested = av_buffersrc_get_nb_failed_requests(pad->buffer) > 0;
// Always request a frame after EOF so that we can know if the EOF state
// changes (e.g. for sparse streams with midstream EOF).
requested |= pad->buffer_is_eof;
if (requested)
read_pad_input(c, pad);
if (!pad->pending.type || c->draining_recover)
continue;
if (pad->buffer_is_eof) {
MP_WARN(c, "eof state changed on %s\n", pad->name);
c->draining_recover = true;
send_global_eof(c);
continue;
}
if (pad->pending.type == MP_FRAME_AUDIO && !c->warned_nospeed) {
struct mp_aframe *aframe = pad->pending.data;
if (mp_aframe_get_speed(aframe) != 1.0) {
MP_ERR(c, "speed changing filters before libavfilter are not "
"supported and can cause desyncs\n");
c->warned_nospeed = true;
}
}
AVFrame *frame = mp_frame_to_av(pad->pending, &pad->timebase);
bool eof = pad->pending.type == MP_FRAME_EOF;
if (c->emulate_audio_pts && pad->pending.type == MP_FRAME_AUDIO) {
struct mp_aframe *aframe = pad->pending.data;
c->in_pts = mp_aframe_end_pts(aframe);
frame->pts = c->in_samples; // timebase is 1/sample_rate
c->in_samples += frame->nb_samples;
}
mp_frame_unref(&pad->pending);
if (!frame && !eof) {
MP_FATAL(c, "out of memory or unsupported format\n");
continue;
}
pad->buffer_is_eof = !frame;
if (av_buffersrc_add_frame(pad->buffer, frame) < 0)
MP_FATAL(c, "could not pass frame to filter\n");
av_frame_free(&frame);
for (int i = 0; i < c->num_out_pads; i++)
c->out_pads[i]->got_eagain = false;
progress = true;
}
if (!was_draining && c->draining_recover)
progress = true;
return progress;
}
// Some filters get stuck and return EAGAIN forever if they did not get any
// input (i.e. we send only EOF as input). "dynaudnorm" is known to be affected.
static bool check_stuck_eagain_on_eof_bug(struct lavfi *c)
{
for (int n = 0; n < c->num_in_pads; n++) {
if (!c->in_pads[n]->buffer_is_eof)
return false;
}
for (int n = 0; n < c->num_out_pads; n++) {
struct lavfi_pad *pad = c->out_pads[n];
if (!pad->buffer_is_eof && !pad->got_eagain)
return false;
}
MP_WARN(c, "Filter is stuck. This is a FFmpeg bug. Treating as EOF.\n");
return true;
}
static bool read_output_pads(struct lavfi *c)
{
bool progress = false;
assert(c->initialized);
for (int n = 0; n < c->num_out_pads; n++) {
struct lavfi_pad *pad = c->out_pads[n];
if (!mp_pin_in_needs_data(pad->pin))
continue;
assert(pad->buffer);
int r = AVERROR_EOF;
if (!pad->buffer_is_eof)
r = av_buffersink_get_frame_flags(pad->buffer, c->tmp_frame, 0);
pad->got_eagain = r == AVERROR(EAGAIN);
if (pad->got_eagain) {
if (check_stuck_eagain_on_eof_bug(c))
r = AVERROR_EOF;
} else {
for (int i = 0; i < c->num_out_pads; i++)
c->out_pads[i]->got_eagain = false;
}
if (r >= 0) {
mp_tags_copy_from_av_dictionary(pad->metadata, c->tmp_frame->metadata);
struct mp_frame frame =
mp_frame_from_av(pad->type, c->tmp_frame, &pad->timebase);
if (c->emulate_audio_pts && frame.type == MP_FRAME_AUDIO) {
AVFrame *avframe = c->tmp_frame;
struct mp_aframe *aframe = frame.data;
double in_time = c->in_samples * av_q2d(c->in_pads[0]->timebase);
double out_time = avframe->pts * av_q2d(pad->timebase);
mp_aframe_set_pts(aframe, c->in_pts +
(c->in_pts != MP_NOPTS_VALUE ? (out_time - in_time) : 0));
}
if (frame.type == MP_FRAME_VIDEO) {
struct mp_image *vframe = frame.data;
vframe->nominal_fps =
av_q2d(av_buffersink_get_frame_rate(pad->buffer));
}
av_frame_unref(c->tmp_frame);
if (frame.type) {
mp_pin_in_write(pad->pin, frame);
} else {
MP_ERR(c, "could not use filter output\n");
mp_frame_unref(&frame);
}
progress = true;
} else if (r == AVERROR(EAGAIN)) {
// We expect that libavfilter will request input on one of the
// input pads (via av_buffersrc_get_nb_failed_requests()).
} else if (r == AVERROR_EOF) {
if (!c->draining_recover && !pad->buffer_is_eof)
mp_pin_in_write(pad->pin, MP_EOF_FRAME);
if (!pad->buffer_is_eof)
progress = true;
pad->buffer_is_eof = true;
} else {
// Real error - ignore it.
MP_ERR(c, "error on filtering (%d)\n", r);
}
}
return progress;
}
static void lavfi_process(struct mp_filter *f)
{
struct lavfi *c = f->priv;
if (!c->initialized)
init_graph(c);
while (c->initialized) {
bool a = read_output_pads(c);
bool b = feed_input_pads(c);
if (!a && !b)
break;
}
// Start over on format changes or EOF draining.
if (c->draining_recover) {
// Wait until all outputs got EOF.
bool all_eof = true;
for (int n = 0; n < c->num_out_pads; n++)
all_eof &= c->out_pads[n]->buffer_is_eof;
if (all_eof) {
MP_VERBOSE(c, "recovering all eof\n");
free_graph(c);
mp_filter_internal_mark_progress(c->f);
}
}
if (c->failed)
mp_filter_internal_mark_failed(c->f);
}
static void lavfi_reset(struct mp_filter *f)
{
struct lavfi *c = f->priv;
free_graph(c);
for (int n = 0; n < c->num_in_pads; n++)
mp_frame_unref(&c->in_pads[n]->pending);
}
static void lavfi_destroy(struct mp_filter *f)
{
struct lavfi *c = f->priv;
lavfi_reset(f);
av_frame_free(&c->tmp_frame);
}
static bool lavfi_command(struct mp_filter *f, struct mp_filter_command *cmd)
{
struct lavfi *c = f->priv;
if (!c->initialized)
return false;
switch (cmd->type) {
case MP_FILTER_COMMAND_TEXT: {
return avfilter_graph_send_command(c->graph, cmd->target,
cmd->cmd, cmd->arg,
&(char){0}, 0, 0) >= 0;
}
case MP_FILTER_COMMAND_GET_META: {
// We can worry later about what it should do to multi output filters.
if (c->num_out_pads < 1)
return false;
struct mp_tags **ptags = cmd->res;
*ptags = mp_tags_dup(NULL, c->out_pads[0]->metadata);
return true;
}
default:
return false;
}
}
static const struct mp_filter_info lavfi_filter = {
.name = "lavfi",
.priv_size = sizeof(struct lavfi),
.process = lavfi_process,
.reset = lavfi_reset,
.destroy = lavfi_destroy,
.command = lavfi_command,
};
static struct lavfi *lavfi_alloc(struct mp_filter *parent)
{
struct mp_filter *f = mp_filter_create(parent, &lavfi_filter);
if (!f)
return NULL;
struct lavfi *c = f->priv;
c->f = f;
c->log = f->log;
c->public.f = f;
c->tmp_frame = av_frame_alloc();
MP_HANDLE_OOM(c->tmp_frame);
return c;
}
static struct mp_lavfi *do_init(struct lavfi *c)
{
precreate_graph(c, true);
if (c->failed)
goto error;
for (int n = 0; n < c->num_in_pads + c->num_out_pads; n++) {
// First add input pins to satisfy order for bidir graph types.
struct lavfi_pad *pad =
n < c->num_in_pads ? c->in_pads[n] : c->out_pads[n - c->num_in_pads];
pad->pin_index = c->f->num_pins;
pad->pin = mp_filter_add_pin(c->f, pad->dir, pad->name);
if (c->force_type && c->force_type != pad->type) {
MP_FATAL(c, "mismatching media type\n");
goto error;
}
}
if (c->force_bidir) {
if (c->f->num_pins != 2) {
MP_FATAL(c, "exactly 2 pads required\n");
goto error;
}
if (mp_pin_get_dir(c->f->ppins[0]) != MP_PIN_OUT ||
mp_pin_get_dir(c->f->ppins[1]) != MP_PIN_IN)
{
MP_FATAL(c, "1 input and 1 output pad required\n");
goto error;
}
}
return &c->public;
error:
talloc_free(c->f);
return NULL;
}
struct mp_lavfi *mp_lavfi_create_graph(struct mp_filter *parent,
enum mp_frame_type type, bool bidir,
char *hwdec_interop,
char **graph_opts, const char *graph)
{
if (!graph)
return NULL;
struct lavfi *c = lavfi_alloc(parent);
if (!c)
return NULL;
c->force_type = type;
c->force_bidir = bidir;
c->graph_opts = mp_dup_str_array(c, graph_opts);
c->graph_string = talloc_strdup(c, graph);
c->hwdec_interop = talloc_strdup(c, hwdec_interop);
return do_init(c);
}
struct mp_lavfi *mp_lavfi_create_filter(struct mp_filter *parent,
enum mp_frame_type type, bool bidir,
char *hwdec_interop,
char **graph_opts,
const char *filter, char **filter_opts)
{
struct lavfi *c = lavfi_alloc(parent);
if (!c)
return NULL;
c->force_type = type;
c->force_bidir = bidir;
c->hwdec_interop = talloc_strdup(c, hwdec_interop);
c->graph_opts = mp_dup_str_array(c, graph_opts);
c->graph_string = talloc_strdup(c, filter);
c->direct_filter_opts = mp_dup_str_array(c, filter_opts);
c->direct_filter = true;
return do_init(c);
}
struct lavfi_user_opts {
bool is_bridge;
enum mp_frame_type type;
char *graph;
char **avopts;
char *filter_name;
char **filter_opts;
bool fix_pts;
char *hwdec_interop;
};
static struct mp_filter *lavfi_create(struct mp_filter *parent, void *options)
{
struct lavfi_user_opts *opts = options;
struct mp_lavfi *l;
if (opts->is_bridge) {
l = mp_lavfi_create_filter(parent, opts->type, true,
opts->hwdec_interop, opts->avopts,
opts->filter_name, opts->filter_opts);
} else {
l = mp_lavfi_create_graph(parent, opts->type, true, opts->hwdec_interop,
opts->avopts, opts->graph);
}
if (l) {
struct lavfi *c = l->f->priv;
c->emulate_audio_pts = opts->fix_pts;
}
talloc_free(opts);
return l ? l->f : NULL;
}
// Does it have exactly one video input and one video output?
static bool is_usable(const AVFilter *filter, int media_type)
{
int nb_inputs = avfilter_filter_pad_count(filter, 0),
nb_outputs = avfilter_filter_pad_count(filter, 1);
if (nb_inputs > 1 || nb_outputs > 1)
return false;
bool input_ok = filter->flags & AVFILTER_FLAG_DYNAMIC_INPUTS;
bool output_ok = filter->flags & AVFILTER_FLAG_DYNAMIC_OUTPUTS;
if (nb_inputs == 1)
input_ok = avfilter_pad_get_type(filter->inputs, 0) == media_type;
if (nb_outputs == 1)
output_ok = avfilter_pad_get_type(filter->outputs, 0) == media_type;
return input_ok && output_ok;
}
bool mp_lavfi_is_usable(const char *name, int media_type)
{
const AVFilter *f = avfilter_get_by_name(name);
return f && is_usable(f, media_type);