50 sscanf(buffer,
"%"SCNd32, &header_size);
60 if (!memcmp(buffer,
"end_head", 8)) {
91 }
else if (!memcmp(buffer,
"channel_count", 13)) {
95 }
else if (!memcmp(buffer,
"sample_byte_format", 18)) {
96 sscanf(buffer,
"%*s %*s %31s",
format);
108 }
else if (!memcmp(buffer,
"sample_coding", 13)) {
109 sscanf(buffer,
"%*s %*s %31s", coding);
110 }
else if (!memcmp(buffer,
"sample_count", 12)) {
111 sscanf(buffer,
"%*s %*s %"SCNd64, &st->
duration);
112 }
else if (!memcmp(buffer,
"sample_n_bytes", 14)) {
113 sscanf(buffer,
"%*s %*s %d", &bps);
114 if (bps > INT16_MAX/8
U)
116 }
else if (!memcmp(buffer,
"sample_rate", 11)) {
118 }
else if (!memcmp(buffer,
"sample_sig_bits", 15)) {
124 if (sscanf(buffer,
"%31s %*s %31s", key, value) == 2) {
136 .
name =
"nistsphere",
142 .extensions =
"nist,sph",
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
#define avpriv_request_sample(...)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
int av_strncasecmp(const char *a, const char *b, size_t n)
Locale-independent case-insensitive compare.
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
GLsizei GLboolean const GLfloat * value
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
#define AVERROR_EOF
End of file.
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
static int nist_read_header(AVFormatContext *s)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
AVDictionary * metadata
Metadata that applies to the whole file.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
enum AVMediaType codec_type
General type of the encoded data.
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
int block_align
Audio only.
int av_strcasecmp(const char *a, const char *b)
Locale-independent case-insensitive compare.
#define AV_DICT_APPEND
If the entry already exists, append to it.
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
AVIOContext * pb
I/O context.
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 be(in the first position) for now.Options-------Then comes the options array.This is what will define the user accessible options.For example
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
AVInputFormat ff_nistsphere_demuxer
This structure contains the data a format has to probe a file.
int64_t duration
Decoding: duration of the stream, in stream time base.
int sample_rate
Audio only.
int bits_per_coded_sample
The number of bits per sample in the codedwords.
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
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
static int nist_probe(const AVProbeData *p)