return NULL; \
}
-#define GET_PIX_FMT_NAME(pix_fmt)\
- const char *name = av_get_pix_fmt_name(pix_fmt);
-
DEF_CHOOSE_FORMAT(enum PixelFormat, pix_fmt, pix_fmts, PIX_FMT_NONE,
GET_PIX_FMT_NAME, ":")
-#define GET_SAMPLE_FMT_NAME(sample_fmt)\
- const char *name = av_get_sample_fmt_name(sample_fmt)
-
DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME, ",")
-#define GET_SAMPLE_RATE_NAME(rate)\
- char name[16];\
- snprintf(name, sizeof(name), "%d", rate);
-
DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
GET_SAMPLE_RATE_NAME, ",")
-#define GET_CH_LAYOUT_NAME(ch_layout)\
- char name[16];\
- snprintf(name, sizeof(name), "0x%"PRIx64, ch_layout);
-
DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
GET_CH_LAYOUT_NAME, ",")
return 0;
}
-static int show_help(const char *opt, const char *arg)
+void show_help_default(const char *opt, const char *arg)
{
int flags = AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_ENCODING_PARAM;
- av_log_set_callback(log_callback_help);
+
show_usage();
show_help_options(options, "Main options:",
0, OPT_EXPERT | OPT_AUDIO | OPT_VIDEO | OPT_SUBTITLE);
show_help_children(avcodec_get_class(), flags);
show_help_children(avformat_get_class(), flags);
show_help_children(sws_get_class(), flags);
- return 0;
}
void show_usage(void)
int refresh;
} VideoState;
-static int show_help(const char *opt, const char *arg);
-
/* options specified by the user */
static AVInputFormat *file_iformat;
static const char *input_filename;
printf("\n");
}
-static int show_help(const char *opt, const char *arg)
+void show_help_default(const char *opt, const char *arg)
{
av_log_set_callback(log_callback_help);
show_usage();
"down/up seek backward/forward 1 minute\n"
"mouse click seek to percentage in file corresponding to fraction of width\n"
);
-
- return 0;
}
static void opt_input_file(void *optctx, const char *filename)
input_filename = arg;
}
-static int show_help(const char *opt, const char *arg)
+void show_help_default(const char *opt, const char *arg)
{
av_log_set_callback(log_callback_help);
show_usage();
show_help_options(options, "Main options:", 0, 0);
printf("\n");
show_help_children(avformat_get_class(), AV_OPT_FLAG_DECODING_PARAM);
- return 0;
}
static void opt_pretty(void)
logfilename[0] = '-';
}
-static void show_help(void)
+void show_help_default(const char *opt, const char *arg)
{
printf("usage: avserver [options]\n"
"Hyper fast multi format Audio/Video streaming server\n");
first = 0;
}
av_strlcpy(buf, po->name, sizeof(buf));
- if (po->flags & HAS_ARG) {
+ if (po->argname) {
av_strlcat(buf, " ", sizeof(buf));
av_strlcat(buf, po->argname, sizeof(buf));
}
return 0;
}
+#define PRINT_CODEC_SUPPORTED(codec, field, type, list_name, term, get_name) \
+ if (codec->field) { \
+ const type *p = c->field; \
+ \
+ printf(" Supported " list_name ":"); \
+ while (*p != term) { \
+ get_name(*p); \
+ printf(" %s", name); \
+ p++; \
+ } \
+ printf("\n"); \
+ } \
+
+static void print_codec(const AVCodec *c)
+{
+ int encoder = av_codec_is_encoder(c);
+
+ printf("%s %s [%s]:\n", encoder ? "Encoder" : "Decoder", c->name,
+ c->long_name ? c->long_name : "");
+
+ if (c->type == AVMEDIA_TYPE_VIDEO) {
+ printf(" Threading capabilities: ");
+ switch (c->capabilities & (CODEC_CAP_FRAME_THREADS |
+ CODEC_CAP_SLICE_THREADS)) {
+ case CODEC_CAP_FRAME_THREADS |
+ CODEC_CAP_SLICE_THREADS: printf("frame and slice"); break;
+ case CODEC_CAP_FRAME_THREADS: printf("frame"); break;
+ case CODEC_CAP_SLICE_THREADS: printf("slice"); break;
+ default: printf("no"); break;
+ }
+ printf("\n");
+ }
+
+ if (c->supported_framerates) {
+ const AVRational *fps = c->supported_framerates;
+
+ printf(" Supported framerates:");
+ while (fps->num) {
+ printf(" %d/%d", fps->num, fps->den);
+ fps++;
+ }
+ printf("\n");
+ }
+ PRINT_CODEC_SUPPORTED(c, pix_fmts, enum PixelFormat, "pixel formats",
+ PIX_FMT_NONE, GET_PIX_FMT_NAME);
+ PRINT_CODEC_SUPPORTED(c, supported_samplerates, int, "sample rates", 0,
+ GET_SAMPLE_RATE_NAME);
+ PRINT_CODEC_SUPPORTED(c, sample_fmts, enum AVSampleFormat, "sample formats",
+ AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME);
+ PRINT_CODEC_SUPPORTED(c, channel_layouts, uint64_t, "channel layouts",
+ 0, GET_CH_LAYOUT_DESC);
+
+ if (c->priv_class) {
+ show_help_children(c->priv_class,
+ AV_OPT_FLAG_ENCODING_PARAM |
+ AV_OPT_FLAG_DECODING_PARAM);
+ }
+}
+
static char get_media_type_char(enum AVMediaType type)
{
switch (type) {
return 0;
}
+static void show_help_codec(const char *name, int encoder)
+{
+ const AVCodecDescriptor *desc;
+ const AVCodec *codec;
+
+ if (!name) {
+ av_log(NULL, AV_LOG_ERROR, "No codec name specified.\n");
+ return;
+ }
+
+ codec = encoder ? avcodec_find_encoder_by_name(name) :
+ avcodec_find_decoder_by_name(name);
+
+ if (codec)
+ print_codec(codec);
+ else if ((desc = avcodec_descriptor_get_by_name(name))) {
+ int printed = 0;
+
+ while ((codec = next_codec_for_id(desc->id, codec, encoder))) {
+ printed = 1;
+ print_codec(codec);
+ }
+
+ if (!printed) {
+ av_log(NULL, AV_LOG_ERROR, "Codec '%s' is known to Libav, "
+ "but no %s for it are available. Libav might need to be "
+ "recompiled with additional external libraries.\n",
+ name, encoder ? "encoders" : "decoders");
+ }
+ } else {
+ av_log(NULL, AV_LOG_ERROR, "Codec '%s' is not recognized by Libav.\n",
+ name);
+ }
+}
+
+int show_help(const char *opt, const char *arg)
+{
+ char *topic, *par;
+ av_log_set_callback(log_callback_help);
+
+ topic = av_strdup(arg ? arg : "");
+ par = strchr(topic, '=');
+ if (par)
+ *par++ = 0;
+
+ if (!*topic) {
+ show_help_default(topic, par);
+ } else if (!strcmp(topic, "decoder")) {
+ show_help_codec(par, 0);
+ } else if (!strcmp(topic, "encoder")) {
+ show_help_codec(par, 1);
+ } else {
+ show_help_default(topic, par);
+ }
+
+ av_freep(&topic);
+ return 0;
+}
+
int read_yesno(void)
{
int c = getchar();
void show_help_children(const AVClass *class, int flags);
/**
+ * Per-avtool specific help handler. Implemented in each
+ * avtool, called by show_help().
+ */
+void show_help_default(const char *opt, const char *arg);
+
+/**
+ * Generic -h handler common to all avtools.
+ */
+int show_help(const char *opt, const char *arg);
+
+/**
* Parse the command line arguments.
*
* @param optctx an opaque options context
* buffers have been released.
*/
void free_buffer_pool(FrameBuffer **pool);
+
+#define GET_PIX_FMT_NAME(pix_fmt)\
+ const char *name = av_get_pix_fmt_name(pix_fmt);
+
+#define GET_SAMPLE_FMT_NAME(sample_fmt)\
+ const char *name = av_get_sample_fmt_name(sample_fmt)
+
+#define GET_SAMPLE_RATE_NAME(rate)\
+ char name[16];\
+ snprintf(name, sizeof(name), "%d", rate);
+
+#define GET_CH_LAYOUT_NAME(ch_layout)\
+ char name[16];\
+ snprintf(name, sizeof(name), "0x%"PRIx64, ch_layout);
+
+#define GET_CH_LAYOUT_DESC(ch_layout)\
+ char name[128];\
+ av_get_channel_layout_string(name, sizeof(name), 0, ch_layout);
+
#endif /* LIBAV_CMDUTILS_H */
{ "L" , OPT_EXIT, {.func_arg = show_license}, "show license" },
- { "h" , OPT_EXIT, {.func_arg = show_help}, "show help" },
- { "?" , OPT_EXIT, {.func_arg = show_help}, "show help" },
- { "help" , OPT_EXIT, {.func_arg = show_help}, "show help" },
- { "-help" , OPT_EXIT, {.func_arg = show_help}, "show help" },
+ { "h" , OPT_EXIT, {.func_arg = show_help}, "show help", "topic" },
+ { "?" , OPT_EXIT, {.func_arg = show_help}, "show help", "topic" },
+ { "help" , OPT_EXIT, {.func_arg = show_help}, "show help", "topic" },
+ { "-help" , OPT_EXIT, {.func_arg = show_help}, "show help", "topic" },
{ "version" , OPT_EXIT, {.func_arg = show_version}, "show version" },
{ "formats" , OPT_EXIT, {.func_arg = show_formats }, "show available formats" },
{ "codecs" , OPT_EXIT, {.func_arg = show_codecs }, "show available codecs" },
@item -L
Show license.
-@item -h, -?, -help, --help
-Show help.
+@item -h, -?, -help, --help [@var{arg}]
+Show help. An optional parameter may be specified to print help about a specific
+item.
+
+Possible values of @var{arg} are:
+@table @option
+@item decoder=@var{decoder_name}
+Print detailed information about the decoder named @var{decoder_name}. Use the
+@option{-decoders} option to get a list of all decoders.
+
+@item encoder=@var{encoder_name}
+Print detailed information about the encoder named @var{encoder_name}. Use the
+@option{-encoders} option to get a list of all encoders.
+@end table
@item -version
Show version.
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