45 ext = strrchr(filename,
'.');
52 const char *mime_type)
60 #if CONFIG_IMAGE2_MUXER 61 if (!short_name && filename &&
79 if (score > score_max) {
88 const char *filename,
const char *mime_type,
100 #if CONFIG_IMAGE2_MUXER 101 if (!strcmp(fmt->name,
"image2") || !strcmp(fmt->name,
"image2pipe")) {
106 codec_id = fmt->video_codec;
109 return fmt->audio_codec;
111 return fmt->subtitle_codec;
113 return fmt->data_codec;
134 int score, score_max = 0;
139 ID3_ALMOST_GREATER_PROBE,
141 ID3_GREATER_MAX_PROBE,
145 lpd.
buf = (
unsigned char *) zerobuffer;
151 nodat = ID3_ALMOST_GREATER_PROBE;
155 nodat = ID3_GREATER_MAX_PROBE;
157 nodat = ID3_GREATER_PROBE;
171 score =
FFMAX(score, 1);
173 case ID3_GREATER_PROBE:
174 case ID3_ALMOST_GREATER_PROBE:
177 case ID3_GREATER_MAX_PROBE:
192 if (score > score_max) {
195 }
else if (score == score_max)
198 if (nodat == ID3_GREATER_PROBE)
200 *score_ret = score_max;
209 if (score_ret > *score_max) {
210 *score_max = score_ret;
223 const char *filename,
void *logctx,
224 unsigned int offset,
unsigned int max_probe_size)
228 int ret = 0, probe_size, buf_offset = 0;
236 "Specified probe size value %u cannot be < %u\n", max_probe_size,
PROBE_BUF_MIN);
240 if (offset >= max_probe_size)
247 pd.
mime_type = (
const char *)mime_type_opt;
254 for (probe_size =
PROBE_BUF_MIN; probe_size <= max_probe_size && !*fmt;
255 probe_size =
FFMIN(probe_size << 1,
256 FFMAX(max_probe_size, probe_size + 1))) {
262 if ((ret =
avio_read(pb, buf + buf_offset,
263 probe_size - buf_offset)) < 0) {
272 if (buf_offset < offset)
285 "Format %s detected only with low score of %d, " 286 "misdetection possible!\n", (*fmt)->name, score);
289 "Format %s probed with size=%d and score=%d\n",
290 (*fmt)->name, probe_size, score);
292 FILE *
f = fopen(
"probestat.tmp",
"ab");
293 fprintf(f,
"probe_size:%d format:%s score:%d filename:%s\n", probe_size, (*fmt)->name, score, filename);
309 return ret < 0 ? ret : score;
313 const char *filename,
void *logctx,
314 unsigned int offset,
unsigned int max_probe_size)
317 return ret < 0 ? ret : 0;
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
#define AV_LOG_WARNING
Something somehow does not look correct.
int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **buf, int buf_size)
Rewind the AVIOContext using the specified buffer containing the first buf_size bytes of the file...
#define ID3v2_DEFAULT_MAGIC
Default magic bytes for ID3v2 header: "ID3".
int av_probe_input_buffer(AVIOContext *pb, ff_const59 AVInputFormat **fmt, const char *filename, void *logctx, unsigned int offset, unsigned int max_probe_size)
Like av_probe_input_buffer2() but returns 0 on success.
Opaque data information usually continuous.
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
const AVClass * av_class
A class for private options.
#define AVERROR_EOF
End of file.
int av_match_ext(const char *filename, const char *extensions)
Return a positive value if the given filename has one of the given extensions, 0 otherwise.
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
const AVOutputFormat * av_muxer_iterate(void **opaque)
Iterate over all registered muxers.
ff_const59 AVInputFormat * av_probe_input_format(ff_const59 AVProbeData *pd, int is_opened)
Guess the file format.
ff_const59 AVInputFormat * av_probe_input_format2(ff_const59 AVProbeData *pd, int is_opened, int *score_max)
Guess the file format.
AVCodecID
Identify the syntax and semantics of the bitstream.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
ff_const59 AVInputFormat * av_find_input_format(const char *short_name)
Find AVInputFormat based on the short name of the input format.
int av_match_name(const char *name, const char *names)
Match instances of a name in a comma-separated list of names.
const char * mime_type
mime_type, when known.
int buf_size
Size of buf except extra allocated bytes.
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
#define AV_OPT_SEARCH_CHILDREN
Search in possible children of the given object first.
enum AVCodecID av_guess_codec(ff_const59 AVOutputFormat *fmt, const char *short_name, const char *filename, const char *mime_type, enum AVMediaType type)
Guess the codec ID based upon muxer and filename.
ff_const59 AVInputFormat * av_probe_input_format3(ff_const59 AVProbeData *pd, int is_opened, int *score_ret)
Guess the file format.
const AVInputFormat * av_demuxer_iterate(void **opaque)
Iterate over all registered demuxers.
int av_reallocp(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory through a pointer to a pointer.
int av_probe_input_buffer2(AVIOContext *pb, ff_const59 AVInputFormat **fmt, const char *filename, void *logctx, unsigned int offset, unsigned int max_probe_size)
Probe a bytestream to determine the input format.
int av_filename_number_test(const char *filename)
Check whether filename actually is a numbered sequence generator.
ff_const59 AVOutputFormat * av_guess_format(const char *short_name, const char *filename, const char *mime_type)
Return the output format in the list of registered output formats which best matches the provided par...
This structure contains the data a format has to probe a file.
int ff_id3v2_match(const uint8_t *buf, const char *magic)
Detect ID3v2 Header.
enum AVCodecID ff_guess_image2_codec(const char *filename)
int av_opt_get(void *obj, const char *name, int search_flags, uint8_t **out_val)
int ff_id3v2_tag_len(const uint8_t *buf)
Get the length of an ID3v2 tag.
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions