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cmdutils: refactor -codecs option.

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Make it print a list of AVCodecDescriptors.

Add new -decoders and -encoders options that print lists of decoders and
encoders respectively.
pull/28/head
Anton Khirnov 13 years ago
parent 3c0df90584
commit 7c10194996
4 changed files with 131 additions and 82 deletions
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  1. 172
      cmdutils.c
  2. 12
      cmdutils.h
  3. 2
      cmdutils_common_opts.h
  4. 25
      doc/avtools-common-opts.texi

172
cmdutils.c
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@ -632,81 +632,123 @@ void show_formats(void)
}
}
void show_codecs(void)
static char get_media_type_char(enum AVMediaType type)
{
AVCodec *p = NULL, *p2;
const char *last_name;
printf("Codecs:\n"
" D..... = Decoding supported\n"
" .E.... = Encoding supported\n"
" ..V... = Video codec\n"
" ..A... = Audio codec\n"
" ..S... = Subtitle codec\n"
" ...S.. = Supports draw_horiz_band\n"
" ....D. = Supports direct rendering method 1\n"
" .....T = Supports weird frame truncation\n"
" ------\n");
last_name= "000";
for (;;) {
int decode = 0;
int encode = 0;
int cap = 0;
const char *type_str;
p2 = NULL;
while ((p = av_codec_next(p))) {
if ((p2 == NULL || strcmp(p->name, p2->name) < 0) &&
strcmp(p->name, last_name) > 0) {
p2 = p;
decode = encode = cap = 0;
}
if (p2 && strcmp(p->name, p2->name) == 0) {
if (av_codec_is_decoder(p))
decode = 1;
if (av_codec_is_encoder(p))
encode = 1;
cap |= p->capabilities;
switch (type) {
case AVMEDIA_TYPE_VIDEO: return 'V';
case AVMEDIA_TYPE_AUDIO: return 'A';
case AVMEDIA_TYPE_SUBTITLE: return 'S';
default: return '?';
}
}
static const AVCodec *next_codec_for_id(enum AVCodecID id, const AVCodec *prev,
int encoder)
{
while ((prev = av_codec_next(prev))) {
if (prev->id == id &&
(encoder ? av_codec_is_encoder(prev) : av_codec_is_decoder(prev)))
return prev;
}
if (p2 == NULL)
break;
last_name = p2->name;
return NULL;
}
switch (p2->type) {
case AVMEDIA_TYPE_VIDEO:
type_str = "V";
break;
case AVMEDIA_TYPE_AUDIO:
type_str = "A";
break;
case AVMEDIA_TYPE_SUBTITLE:
type_str = "S";
static void print_codecs_for_id(enum AVCodecID id, int encoder)
{
const AVCodec *codec = NULL;
printf(" (%s: ", encoder ? "encoders" : "decoders");
while ((codec = next_codec_for_id(id, codec, encoder)))
printf("%s ", codec->name);
printf(")");
}
void show_codecs(void)
{
const AVCodecDescriptor *desc = NULL;
printf("Codecs:\n"
" D... = Decoding supported\n"
" .E.. = Encoding supported\n"
" ..V. = Video codec\n"
" ..A. = Audio codec\n"
" ..S. = Subtitle codec\n"
" ...I = Intra frame-only codec\n"
" -----\n");
while ((desc = avcodec_descriptor_next(desc))) {
const AVCodec *codec = NULL;
printf(avcodec_find_decoder(desc->id) ? "D" : ".");
printf(avcodec_find_encoder(desc->id) ? "E" : ".");
printf("%c", get_media_type_char(desc->type));
printf((desc->props & AV_CODEC_PROP_INTRA_ONLY) ? "I" : ".");
printf(" %-20s %s", desc->name, desc->long_name ? desc->long_name : "");
/* print decoders/encoders when there's more than one or their
* names are different from codec name */
while ((codec = next_codec_for_id(desc->id, codec, 0))) {
if (strcmp(codec->name, desc->name)) {
print_codecs_for_id(desc->id, 0);
break;
default:
type_str = "?";
}
}
codec = NULL;
while ((codec = next_codec_for_id(desc->id, codec, 1))) {
if (strcmp(codec->name, desc->name)) {
print_codecs_for_id(desc->id, 1);
break;
}
printf(" %s%s%s%s%s%s %-15s %s",
decode ? "D" : (/* p2->decoder ? "d" : */ " "),
encode ? "E" : " ",
type_str,
cap & CODEC_CAP_DRAW_HORIZ_BAND ? "S" : " ",
cap & CODEC_CAP_DR1 ? "D" : " ",
cap & CODEC_CAP_TRUNCATED ? "T" : " ",
p2->name,
p2->long_name ? p2->long_name : "");
#if 0
if (p2->decoder && decode == 0)
printf(" use %s for decoding", p2->decoder->name);
#endif
}
printf("\n");
}
}
static void print_codecs(int encoder)
{
const AVCodecDescriptor *desc = NULL;
printf("%s:\n"
" V... = Video\n"
" A... = Audio\n"
" S... = Subtitle\n"
" .F.. = Frame-level multithreading\n"
" ..S. = Slice-level multithreading\n"
" ...X = Codec is experimental\n"
" ---\n",
encoder ? "Encoders" : "Decoders");
while ((desc = avcodec_descriptor_next(desc))) {
const AVCodec *codec = NULL;
while ((codec = next_codec_for_id(desc->id, codec, encoder))) {
printf("%c", get_media_type_char(desc->type));
printf((codec->capabilities & CODEC_CAP_FRAME_THREADS) ? "F" : ".");
printf((codec->capabilities & CODEC_CAP_SLICE_THREADS) ? "S" : ".");
printf((codec->capabilities & CODEC_CAP_EXPERIMENTAL) ? "X" : ".");
printf(" %-20s %s", codec->name, codec->long_name ? codec->long_name : "");
if (strcmp(codec->name, desc->name))
printf(" (codec %s)", desc->name);
printf("\n");
printf("Note, the names of encoders and decoders do not always match, so there are\n"
"several cases where the above table shows encoder only or decoder only entries\n"
"even though both encoding and decoding are supported. For example, the h263\n"
"decoder corresponds to the h263 and h263p encoders, for file formats it is even\n"
"worse.\n");
}
}
}
int show_decoders(const char *opt, const char *arg)
{
print_codecs(0);
return 0;
}
int show_encoders(const char *opt, const char *arg)
{
print_codecs(1);
return 0;
}
void show_bsfs(void)

12
cmdutils.h
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@ -278,6 +278,18 @@ void show_formats(void);
*/
void show_codecs(void);
/**
* Print a listing containing all the decoders supported by the
* program.
*/
int show_decoders(const char *opt, const char *arg);
/**
* Print a listing containing all the encoders supported by the
* program.
*/
int show_encoders(const char *opt, const char *arg);
/**
* Print a listing containing all the filters supported by the
* program.

2
cmdutils_common_opts.h
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@ -6,6 +6,8 @@
{ "version", OPT_EXIT, {(void*)show_version}, "show version" },
{ "formats" , OPT_EXIT, {(void*)show_formats }, "show available formats" },
{ "codecs" , OPT_EXIT, {(void*)show_codecs }, "show available codecs" },
{ "decoders" , OPT_EXIT, {(void*)show_decoders }, "show available decoders" },
{ "encoders" , OPT_EXIT, {(void*)show_encoders }, "show available encoders" },
{ "bsfs" , OPT_EXIT, {(void*)show_bsfs }, "show available bit stream filters" },
{ "protocols", OPT_EXIT, {(void*)show_protocols}, "show available protocols" },
{ "filters", OPT_EXIT, {(void*)show_filters }, "show available filters" },

25
doc/avtools-common-opts.texi
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@ -69,23 +69,16 @@ Encoding available
@end table
@item -codecs
Show available codecs.
Show all codecs known to libavcodec.
The fields preceding the codec names have the following meanings:
@table @samp
@item D
Decoding available
@item E
Encoding available
@item V/A/S
Video/audio/subtitle codec
@item S
Codec supports slices
@item D
Codec supports direct rendering
@item T
Codec can handle input truncated at random locations instead of only at frame boundaries
@end table
Note that the term 'codec' is used throughout this documentation as a shortcut
for what is more correctly called a media bitstream format.
@item -decoders
Show available decoders.
@item -encoders
Show all available encoders.
@item -bsfs
Show available bitstream filters.

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