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Lavc: allow codec option listing

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This commit is contained in:
Martin Pulec
2020-06-16 12:47:00 +02:00
parent 914d980f9d
commit 219459aa5d
1 changed files with 31 additions and 4 deletions
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35
src/video_compress/libavcodec.cpp
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@@ -126,6 +126,7 @@ static void set_thread_mode(AVCodecContext *codec_ctx, struct setparam_param *pa
typedef void (*pixfmt_callback_t)(AVFrame *out_frame, unsigned char *in_data, int width, int height);
static pixfmt_callback_t select_pixfmt_callback(AVPixelFormat fmt, codec_t src);
static void show_encoder_help(string const &name);
static void usage(void);
static int parse_fmt(struct state_video_compress_libav *s, char *fmt);
static void cleanup(struct state_video_compress_libav *s);
@@ -344,12 +345,14 @@ static void usage() {
cout << style::bold << "\t\t<thr_mode>" << style::reset << " can be one of \"no\", \"frame\", \"slice\" or a number (of slice threads)\n";
cout << style::bold << "\t\t<gop>" << style::reset << " specifies GOP size\n";
cout << style::bold << "\t\t<lavc_opt>" << style::reset << " arbitrary option to be passed directly to libavcodec (eg. preset=veryfast), eventual colons must be backslash-escaped (eg. for x264opts)\n";
cout << "\tLibavcodec version (linked): " << style::bold << LIBAVCODEC_IDENT << style::reset << "\n";
cout << "\tUse '" << style::bold << "-c libavcodec:encoder=<enc>:help" << style::reset << "' to display encoder specific options.\n";
cout << "\n";
cout << "Libavcodec version (linked): " << style::bold << LIBAVCODEC_IDENT << style::reset << "\n";
const char *swscale = "no";
#ifdef HAVE_SWSCALE
swscale = "yes";
#endif
cout << "\tLibswscale supported: " << style::bold << swscale << style::reset << "\n";
cout << "Libswscale supported: " << style::bold << swscale << style::reset << "\n";
}
static int parse_fmt(struct state_video_compress_libav *s, char *fmt) {
@@ -357,14 +360,15 @@ static int parse_fmt(struct state_video_compress_libav *s, char *fmt) {
return 0;
}
bool show_help = false;
// replace all '\:' with 2xDEL
replace_all(fmt, ESCAPED_COLON, DELDEL);
char *item, *save_ptr = NULL;
while ((item = strtok_r(fmt, ":", &save_ptr)) != NULL) {
if(strncasecmp("help", item, strlen("help")) == 0) {
usage();
return 1;
show_help = true;
} else if(strncasecmp("codec=", item, strlen("codec=")) == 0) {
char *codec = item + strlen("codec=");
s->requested_codec_id = get_codec_from_name(codec);
@@ -421,6 +425,15 @@ static int parse_fmt(struct state_video_compress_libav *s, char *fmt) {
fmt = NULL;
}
if (show_help) {
if (s->backend.empty()) {
usage();
} else {
show_encoder_help(s->backend);
}
return 1;
}
return 0;
}
@@ -1730,6 +1743,20 @@ static void setparam_h264_h265_av1(AVCodecContext *codec_ctx, struct setparam_pa
}
}
void show_encoder_help(string const &name) {
cout << "Options for " << style::bold << name << style::reset << ":\n";
auto *codec = avcodec_find_encoder_by_name(name.c_str());
const auto *opt = codec->priv_class->option;
if (opt == nullptr) {
return;
}
while (opt->name != nullptr) {
cout << (opt->offset == 0 ? "\t\t* " : "\t- ");
cout << style::bold << opt->name << style::reset << (strlen(opt->help) > 0 ? " - " : "") << opt->help << "\n";
opt++;
}
}
static string get_h264_h265_preset(string const & enc_name, int width, int height, double fps)
{
if (enc_name == "libx264" || enc_name == "libx264rgb") {