gstriff

gstriff — Riff fileformat utillity functions.

Functions

GstCaps * gst_riff_create_audio_caps ()
GstCaps * gst_riff_create_audio_template_caps ()
GstCaps * gst_riff_create_iavs_caps ()
GstCaps * gst_riff_create_iavs_template_caps ()
GstCaps * gst_riff_create_video_caps ()
GstCaps * gst_riff_create_video_template_caps ()
void gst_riff_init ()
gboolean gst_riff_parse_chunk ()
gboolean gst_riff_parse_file_header ()
void gst_riff_parse_info ()
gboolean gst_riff_parse_strf_auds ()
gboolean gst_riff_parse_strf_iavs ()
gboolean gst_riff_parse_strf_vids ()
gboolean gst_riff_parse_strh ()
GstFlowReturn gst_riff_read_chunk ()

Includes

#include <gst/riff/riff-media.h>

Description

A collection of functions to handle riff base files, such as avi, wav and asf.

Functions

gst_riff_create_audio_caps ()

GstCaps *
gst_riff_create_audio_caps (guint16 codec_id,
                            gst_riff_strh *strh,
                            gst_riff_strf_auds *strf,
                            GstBuffer *strf_data,
                            GstBuffer *strd_data,
                            char **codec_name,
                            gint channel_reorder_map[18]);

gst_riff_create_audio_template_caps ()

GstCaps *
gst_riff_create_audio_template_caps (void);

gst_riff_create_iavs_caps ()

GstCaps *
gst_riff_create_iavs_caps (guint32 codec_fcc,
                           gst_riff_strh *strh,
                           gst_riff_strf_iavs *strf,
                           GstBuffer *strf_data,
                           GstBuffer *strd_data,
                           char **codec_name);

gst_riff_create_iavs_template_caps ()

GstCaps *
gst_riff_create_iavs_template_caps (void);

gst_riff_create_video_caps ()

GstCaps *
gst_riff_create_video_caps (guint32 codec_fcc,
                            gst_riff_strh *strh,
                            gst_riff_strf_vids *strf,
                            GstBuffer *strf_data,
                            GstBuffer *strd_data,
                            char **codec_name);

Parameters

codec_fcc

fourCC codec for this codec.

  

strh

pointer to the strh stream header structure.

  

strf

pointer to the strf stream header structure, including any data that is within the range of strf.size, but excluding any additional data withint this chunk but outside strf.size.

  

strf_data

a GstBuffer containing the additional data in the strf chunk outside reach of strf.size. Ususally a palette.

  

strd_data

a GstBuffer containing the data in the strd stream header chunk. Usually codec initialization data.

  

codec_name

if given, will be filled with a human-readable codec name.

  

gst_riff_create_video_template_caps ()

GstCaps *
gst_riff_create_video_template_caps (void);

gst_riff_init ()

void
gst_riff_init (void);

Initialize riff library.

gst_riff_parse_chunk ()

gboolean
gst_riff_parse_chunk (GstElement *element,
                      GstBuffer *buf,
                      guint *offset,
                      guint32 *fourcc,
                      GstBuffer **chunk_data);

Reads a single chunk.

Parameters

element

caller element (used for debugging).

  

buf

input buffer.

  

offset

offset in the buffer in the caller. Is incremented by the read size by this function.

  

fourcc

fourcc (returned by this function0 of the chunk.

  

chunk_data

buffer (returned by the function) containing the chunk data, which may be NULL if chunksize == 0

  

Returns

FALSE on error, TRUE otherwise

gst_riff_parse_file_header ()

gboolean
gst_riff_parse_file_header (GstElement *element,
                            GstBuffer *buf,
                            guint32 *doctype);

Reads the first few bytes from the provided buffer, checks if this stream is a RIFF stream, and determines document type. This function takes ownership of buf so it should not be used anymore after calling this function.

Parameters

element

caller element (used for debugging/error).

  

buf

input buffer from which the file header will be parsed, should be at least 12 bytes long.

  

doctype

a fourcc (returned by this function) to indicate the type of document (according to the header).

  

Returns

FALSE if this is not a RIFF stream (in which case the caller should error out; we already throw an error), or TRUE if it is.

gst_riff_parse_info ()

void
gst_riff_parse_info (GstElement *element,
                     GstBuffer *buf,
                     GstTagList **taglist);

Parses stream metadata from input data.

Parameters

element

caller element (used for debugging/error).

  

buf

input data to be used for parsing, stripped from header.

  

taglist

a pointer to a taglist (returned by this function) containing information about this stream. May be NULL if no supported tags were found.

  

gst_riff_parse_strf_auds ()

gboolean
gst_riff_parse_strf_auds (GstElement *element,
                          GstBuffer *buf,
                          gst_riff_strf_auds **strf,
                          GstBuffer **data);

Parses an audio stream´s strf structure plus optionally some extradata from input data. This function takes ownership of buf . use.

Parameters

element

caller element (used for debugging/error).

  

buf

input data to be used for parsing, stripped from header.

  

strf

a pointer (returned by this function) to a filled-in strf/auds structure. Caller should free it.

  

data

a pointer (returned by this function) to a buffer containing extradata for this particular stream (e.g. codec initialization data).

  

Returns

TRUE if parsing succeeded, otherwise FALSE. The stream should be skipped on error, but it is not fatal.

gst_riff_parse_strf_iavs ()

gboolean
gst_riff_parse_strf_iavs (GstElement *element,
                          GstBuffer *buf,
                          gst_riff_strf_iavs **strf,
                          GstBuffer **data);

Parses a interleaved (also known as "complex") stream´s strf structure plus optionally some extradata from input data. This function takes ownership of buf .

Parameters

element

caller element (used for debugging/error).

  

buf

input data to be used for parsing, stripped from header.

  

strf

a pointer (returned by this function) to a filled-in strf/iavs structure. Caller should free it.

  

data

a pointer (returned by this function) to a buffer containing extradata for this particular stream (e.g. codec initialization data).

  

Returns

TRUE if parsing succeeded, otherwise FALSE.

gst_riff_parse_strf_vids ()

gboolean
gst_riff_parse_strf_vids (GstElement *element,
                          GstBuffer *buf,
                          gst_riff_strf_vids **strf,
                          GstBuffer **data);

Parses a video stream´s strf structure plus optionally some extradata from input data. This function takes ownership of buf .

Parameters

element

caller element (used for debugging/error).

  

buf

input data to be used for parsing, stripped from header.

  

strf

a pointer (returned by this function) to a filled-in strf/vids structure. Caller should free it.

  

data

a pointer (returned by this function) to a buffer containing extradata for this particular stream (e.g. palette, codec initialization data).

  

Returns

TRUE if parsing succeeded, otherwise FALSE. The stream should be skipped on error, but it is not fatal.

gst_riff_parse_strh ()

gboolean
gst_riff_parse_strh (GstElement *element,
                     GstBuffer *buf,
                     gst_riff_strh **strh);

Parses a strh structure from input data. Takes ownership of buf .

Parameters

element

caller element (used for debugging/error).

  

buf

input data to be used for parsing, stripped from header.

  

strh

a pointer (returned by this function) to a filled-in strh structure. Caller should free it.

  

Returns

TRUE if parsing succeeded, otherwise FALSE. The stream should be skipped on error, but it is not fatal.

gst_riff_read_chunk ()

GstFlowReturn
gst_riff_read_chunk (GstElement *element,
                     GstPad *pad,
                     guint64 *offset,
                     guint32 *tag,
                     GstBuffer **chunk_data);

Reads a single chunk of data. 'JUNK' chunks are skipped automatically.

Parameters

element

caller element (used for debugging).

  

pad

pad to pull data from.

  

offset

offset to pull from, incremented by this function.

  

tag

fourcc of the chunk (returned by this function).

  

chunk_data

buffer (returned by this function).

  

Returns

flow status.

Types and Values

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