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webp/mux.h: data lifetime note w/copy_data=0

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The data mostly must persist until a call to Assemble() is made. If the
data is discarded and subsequent calls are made the behavior is
undefined.

Change-Id: I64b39034ae4663e9ca25b85040b6068d09dfac04
This commit is contained in:
James Zern 2024-03-06 11:11:24 -08:00
parent 45f995a37e
commit 8ea678b990
1 changed files with 15 additions and 5 deletions
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20
src/webp/mux.h
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@ -131,7 +131,9 @@ WEBP_NODISCARD WEBP_EXTERN WebPMux* WebPMuxCreateInternal(const WebPData*, int,
// Parameters: // Parameters:
// bitstream - (in) the bitstream data in WebP RIFF format // bitstream - (in) the bitstream data in WebP RIFF format
// copy_data - (in) value 1 indicates given data WILL be copied to the mux // copy_data - (in) value 1 indicates given data WILL be copied to the mux
// object and value 0 indicates data will NOT be copied. // object and value 0 indicates data will NOT be copied. If the
// data is not copied, it must exist for the lifetime of the
// mux object.
// Returns: // Returns:
// A pointer to the mux object created from given data - on success. // A pointer to the mux object created from given data - on success.
// NULL - In case of invalid data or memory error. // NULL - In case of invalid data or memory error.
@ -156,7 +158,9 @@ WEBP_NODISCARD static WEBP_INLINE WebPMux* WebPMuxCreate(
// e.g., "ICCP", "XMP ", "EXIF" etc. // e.g., "ICCP", "XMP ", "EXIF" etc.
// chunk_data - (in) the chunk data to be added // chunk_data - (in) the chunk data to be added
// copy_data - (in) value 1 indicates given data WILL be copied to the mux // copy_data - (in) value 1 indicates given data WILL be copied to the mux
// object and value 0 indicates data will NOT be copied. // object and value 0 indicates data will NOT be copied. If the
// data is not copied, it must exist until a call to
// WebPMuxAssemble() is made.
// Returns: // Returns:
// WEBP_MUX_INVALID_ARGUMENT - if mux, fourcc or chunk_data is NULL // WEBP_MUX_INVALID_ARGUMENT - if mux, fourcc or chunk_data is NULL
// or if fourcc corresponds to an image chunk. // or if fourcc corresponds to an image chunk.
@ -219,7 +223,9 @@ struct WebPMuxFrameInfo {
// bitstream - (in) can be a raw VP8/VP8L bitstream or a single-image // bitstream - (in) can be a raw VP8/VP8L bitstream or a single-image
// WebP file (non-animated) // WebP file (non-animated)
// copy_data - (in) value 1 indicates given data WILL be copied to the mux // copy_data - (in) value 1 indicates given data WILL be copied to the mux
// object and value 0 indicates data will NOT be copied. // object and value 0 indicates data will NOT be copied. If the
// data is not copied, it must exist until a call to
// WebPMuxAssemble() is made.
// Returns: // Returns:
// WEBP_MUX_INVALID_ARGUMENT - if mux is NULL or bitstream is NULL. // WEBP_MUX_INVALID_ARGUMENT - if mux is NULL or bitstream is NULL.
// WEBP_MUX_MEMORY_ERROR - on memory allocation error. // WEBP_MUX_MEMORY_ERROR - on memory allocation error.
@ -237,7 +243,9 @@ WEBP_EXTERN WebPMuxError WebPMuxSetImage(
// mux - (in/out) object to which the frame is to be added // mux - (in/out) object to which the frame is to be added
// frame - (in) frame data. // frame - (in) frame data.
// copy_data - (in) value 1 indicates given data WILL be copied to the mux // copy_data - (in) value 1 indicates given data WILL be copied to the mux
// object and value 0 indicates data will NOT be copied. // object and value 0 indicates data will NOT be copied. If the
// data is not copied, it must exist until a call to
// WebPMuxAssemble() is made.
// Returns: // Returns:
// WEBP_MUX_INVALID_ARGUMENT - if mux or frame is NULL // WEBP_MUX_INVALID_ARGUMENT - if mux or frame is NULL
// or if content of 'frame' is invalid. // or if content of 'frame' is invalid.
@ -537,7 +545,9 @@ WEBP_EXTERN void WebPAnimEncoderDelete(WebPAnimEncoder* enc);
// e.g., "ICCP", "XMP ", "EXIF", etc. // e.g., "ICCP", "XMP ", "EXIF", etc.
// chunk_data - (in) the chunk data to be added // chunk_data - (in) the chunk data to be added
// copy_data - (in) value 1 indicates given data WILL be copied to the enc // copy_data - (in) value 1 indicates given data WILL be copied to the enc
// object and value 0 indicates data will NOT be copied. // object and value 0 indicates data will NOT be copied. If the
// data is not copied, it must exist until a call to
// WebPAnimEncoderAssemble() is made.
// Returns: // Returns:
// WEBP_MUX_INVALID_ARGUMENT - if enc, fourcc or chunk_data is NULL. // WEBP_MUX_INVALID_ARGUMENT - if enc, fourcc or chunk_data is NULL.
// WEBP_MUX_MEMORY_ERROR - on memory allocation error. // WEBP_MUX_MEMORY_ERROR - on memory allocation error.