Go to the documentation of this file.
50 sscanf(
buffer,
"%"SCNd32, &header_size);
60 if (!memcmp(
buffer,
"end_head", 8)) {
92 }
else if (!memcmp(
buffer,
"channel_count", 13)) {
96 }
else if (!memcmp(
buffer,
"sample_byte_format", 18)) {
109 }
else if (!memcmp(
buffer,
"sample_coding", 13)) {
110 sscanf(
buffer,
"%*s %*s %31s", coding);
111 }
else if (!memcmp(
buffer,
"sample_count", 12)) {
113 }
else if (!memcmp(
buffer,
"sample_n_bytes", 14)) {
115 if (
bps > INT16_MAX/8
U)
117 }
else if (!memcmp(
buffer,
"sample_rate", 11)) {
119 }
else if (!memcmp(
buffer,
"sample_sig_bits", 15)) {
137 .
name =
"nistsphere",
143 .extensions =
"nist,sph",
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
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
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
enum AVMediaType codec_type
General type of the encoded data.
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
#define AVERROR_EOF
End of file.
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 nb_channels
Number of channels in this layout.
static int nist_read_header(AVFormatContext *s)
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
int64_t duration
Decoding: duration of the stream, in stream time base.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
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 format(the sample packing is implied by the sample format) and sample rate. The lists are not just lists
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
This structure contains the data a format has to probe a file.
AVChannelLayout ch_layout
Audio only.
int sample_rate
Audio only.
int av_strncasecmp(const char *a, const char *b, size_t n)
Locale-independent case-insensitive compare.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
const AVInputFormat ff_nistsphere_demuxer
int block_align
Audio only.
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 default value
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
the frame and frame reference mechanism is intended to as much as expensive copies of that data while still allowing the filters to produce correct results The data is stored in buffers represented by AVFrame structures Several references can point to the same frame buffer
static int nist_probe(const AVProbeData *p)
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
int bits_per_coded_sample
The number of bits per sample in the codedwords.
#define avpriv_request_sample(...)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.