libwebp/src/webp/mux.h

// Copyright 2011 Google Inc. All Rights Reserved.
//
// This code is licensed under the same terms as WebM:
//  Software License Agreement:  http://www.webmproject.org/license/software/
//  Additional IP Rights Grant:  http://www.webmproject.org/license/additional/
// -----------------------------------------------------------------------------
//
//  RIFF container manipulation for WEBP images.
//
// Authors: Urvang (urvang@google.com)
//          Vikas (vikasa@google.com)

// This API allows manipulation of WebP container images containing features
// like Color profile, XMP metadata, Animation & Tiling.
//
// Code Example#1: Creating a MUX with image data, color profile & XMP metadata.
//
//   int copy_data = 0;
//   WebPMux* mux = WebPMuxNew();
//   // ... (Prepare image data).
//   WebPMuxSetImage(mux, image_data, image_data_size, alpha_data, alpha_size,
//                   copy_data);
//   // ... (Prepare ICCP color profile data).
//   WebPMuxSetColorProfile(mux, icc_data, icc_data_size, copy_data);
//   // ... (Prepare XMP metadata).
//   WebPMuxSetMetadata(mux, xmp_data, xmp_data_size, copy_data);
//   // Get data from mux in WebP RIFF format.
//   WebPMuxAssemble(mux, &output_data, &output_data_size);
//   WebPMuxDelete(mux);
//   // ... (Consume output_data; e.g. write output_data to file).
//   free(output_data);
//
// Code Example#2: Get image & color profile data from a WebP file.
//
//   int copy_data = 0;
//   // ... (Read data from file).
//   WebPMux* mux = WebPMuxCreate(data, data_size, copy_data, NULL);
//   WebPMuxGetImage(mux, &image, &alpha);
//   // ... (Consume image; e.g. call WebPDecode() to decode the data).
//   WebPMuxGetColorProfile(mux, &icc_profile);
//   // ... (Consume icc_data).
//   WebPMuxDelete(mux);
//   free(data);

#ifndef WEBP_WEBP_MUX_H_
#define WEBP_WEBP_MUX_H_

#include "./types.h"

#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif

#define WEBP_MUX_ABI_VERSION 0x0000

// Error codes
typedef enum {
  WEBP_MUX_OK                 =  1,
  WEBP_MUX_ERROR              =  0,
  WEBP_MUX_NOT_FOUND          = -1,
  WEBP_MUX_INVALID_ARGUMENT   = -2,
  WEBP_MUX_INVALID_PARAMETER  = -3,
  WEBP_MUX_BAD_DATA           = -4,
  WEBP_MUX_MEMORY_ERROR       = -5,
  WEBP_MUX_NOT_ENOUGH_DATA    = -6
} WebPMuxError;

typedef enum {
  WEBP_MUX_STATE_PARTIAL  =  0,
  WEBP_MUX_STATE_COMPLETE =  1,
  WEBP_MUX_STATE_ERROR    = -1
} WebPMuxState;

// Flag values for different features used in VP8X chunk.
typedef enum {
  TILE_FLAG       = 0x00000001,
  ANIMATION_FLAG  = 0x00000002,
  ICCP_FLAG       = 0x00000004,
  META_FLAG       = 0x00000008,
  ALPHA_FLAG      = 0x00000010
} FeatureFlags;

typedef struct WebPMux WebPMux;   // main opaque object.

// Data type used to describe 'raw' data, e.g., chunk data
// (ICC profile, metadata) and WebP compressed image data.
typedef struct {
  const uint8_t* bytes_;
  size_t size_;
} WebPData;

//------------------------------------------------------------------------------
// Life of a Mux object

// Internal, version-checked, entry point
WEBP_EXTERN(WebPMux*) WebPNewInternal(int);

// Creates an empty mux object.
// Returns:
//   A pointer to the newly created empty mux object.
static WEBP_INLINE WebPMux* WebPMuxNew(void) {
  return WebPNewInternal(WEBP_MUX_ABI_VERSION);
}

// Deletes the mux object.
// Parameters:
//   mux - (in/out) object to be deleted
WEBP_EXTERN(void) WebPMuxDelete(WebPMux* const mux);

//------------------------------------------------------------------------------
// Mux creation.

// Internal, version-checked, entry point
WEBP_EXTERN(WebPMux*) WebPMuxCreateInternal(const uint8_t*, size_t,
                                            int, WebPMuxState* const, int);

// Creates a mux object from raw data given in WebP RIFF format.
// Parameters:
//   data - (in) the raw data in WebP RIFF format
//   size - (in) size of raw data
//   copy_data - (in) value 1 indicates given data WILL copied to the mux, and
//               value 0 indicates data will NOT be copied.
//   mux_state - (out) indicates the state of the mux returned. Can be passed
//               NULL if not required.
// Returns:
//   A pointer to the mux object created from given data - on success.
//   NULL - In case of invalid data or memory error.
static WEBP_INLINE WebPMux* WebPMuxCreate(const uint8_t* data, size_t size,
                                          int copy_data,
                                          WebPMuxState* const mux_state) {
  return WebPMuxCreateInternal(
      data, size, copy_data, mux_state, WEBP_MUX_ABI_VERSION);
}

//------------------------------------------------------------------------------
// Single Image.

// Sets the image in the mux object. Any existing images (including frame/tile)
// will be removed.
// Parameters:
//   mux - (in/out) object in which the image is to be set
//   data - (in) the image data to be set. The data can be either a VP8
//          bitstream or a single-image WebP file (non-animated & non-tiled)
//   size - (in) size of the image data
//   alpha_data - (in) the alpha data corresponding to the image (if present)
//   alpha_size - (in) size of alpha chunk data
//   copy_data - (in) value 1 indicates given data WILL copied to the mux, and
//               value 0 indicates data will NOT be copied.
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL or data is NULL.
//   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxSetImage(
    WebPMux* const mux,
    const uint8_t* data, size_t size,
    const uint8_t* alpha_data, size_t alpha_size,
    int copy_data);

// Gets a reference to the image in the mux object.
// The caller should NOT free the returned data.
// Parameters:
//   mux - (in) object from which the image is to be fetched
//   image - (out) the image data
//   alpha - (out) the alpha data of the image (if present)
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if either mux or both image & alpha are NULL
//                               OR mux contains animation/tiling.
//   WEBP_MUX_NOT_FOUND - if image is not present in mux object.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxGetImage(const WebPMux* const mux,
                                          WebPData* const image,
                                          WebPData* const alpha);

// Deletes the image in the mux object.
// Parameters:
//   mux - (in/out) object from which the image is to be deleted
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL
//                               OR if mux contains animation/tiling.
//   WEBP_MUX_NOT_FOUND - if image is not present in mux object.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxDeleteImage(WebPMux* const mux);

//------------------------------------------------------------------------------
// XMP Metadata.

// Sets the XMP metadata in the mux object. Any existing metadata chunk(s) will
// be removed.
// Parameters:
//   mux - (in/out) object to which the XMP metadata is to be added
//   data - (in) the XMP metadata data to be added
//   size - (in) size of the XMP metadata data
//   copy_data - (in) value 1 indicates given data WILL copied to the mux, and
//               value 0 indicates data will NOT be copied.
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL or data is NULL.
//   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxSetMetadata(
    WebPMux* const mux, const uint8_t* data, size_t size, int copy_data);

// Gets a reference to the XMP metadata in the mux object.
// The caller should NOT free the returned data.
// Parameters:
//   mux - (in) object from which the XMP metadata is to be fetched
//   metadata - (out) XMP metadata
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if either mux or metadata is NULL.
//   WEBP_MUX_NOT_FOUND - if metadata is not present in mux object.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxGetMetadata(
    const WebPMux* const mux, WebPData* const metadata);

// Deletes the XMP metadata in the mux object.
// Parameters:
//   mux - (in/out) object from which XMP metadata is to be deleted
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL
//   WEBP_MUX_NOT_FOUND - If mux does not contain metadata.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxDeleteMetadata(WebPMux* const mux);

//------------------------------------------------------------------------------
// ICC Color Profile.

// Sets the color profile in the mux object. Any existing color profile chunk(s)
// will be removed.
// Parameters:
//   mux - (in/out) object to which the color profile is to be added
//   data - (in) the color profile data to be added
//   size - (in) size of the color profile data
//   copy_data - (in) value 1 indicates given data WILL copied to the mux, and
//               value 0 indicates data will NOT be copied.
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL or data is NULL
//   WEBP_MUX_MEMORY_ERROR - on memory allocation error
//   WEBP_MUX_OK - on success
WEBP_EXTERN(WebPMuxError) WebPMuxSetColorProfile(
    WebPMux* const mux, const uint8_t* data, size_t size, int copy_data);

// Gets a reference to the color profile in the mux object.
// The caller should NOT free the returned data.
// Parameters:
//   mux - (in) object from which the color profile data is to be fetched
//   color_profile - (out) color profile data
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if either mux or color_profile is NULL.
//   WEBP_MUX_NOT_FOUND - if color profile is not present in mux object.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxGetColorProfile(
    const WebPMux* const mux, WebPData* const color_profile);

// Deletes the color profile in the mux object.
// Parameters:
//   mux - (in/out) object from which color profile is to be deleted
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL
//   WEBP_MUX_NOT_FOUND - If mux does not contain color profile.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxDeleteColorProfile(WebPMux* const mux);

//------------------------------------------------------------------------------
// Animation.

// Adds an animation frame to the mux object.
// nth=0 has a special meaning - last position.
// Parameters:
//   mux - (in/out) object to which an animation frame is to be added
//   nth - (in) The position at which the frame is to be added.
//   data - (in) the raw VP8 image data corresponding to frame image. The data
//          can be either a VP8 bitstream or a single-image WebP file
//          (non-animated & non-tiled)
//   size - (in) size of frame chunk data
//   alpha_data - (in) the alpha data corresponding to frame image (if present)
//   alpha_size - (in) size of alpha chunk data
//   x_offset - (in) x-offset of the frame to be added
//   y_offset - (in) y-offset of the frame to be added
//   duration - (in) duration of the frame to be added (in milliseconds)
//   copy_data - (in) value 1 indicates given data WILL copied to the mux, and
//               value 0 indicates data will NOT be copied.
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL or data is NULL
//   WEBP_MUX_NOT_FOUND - If we have less than (nth-1) frames before adding.
//   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxAddFrame(
    WebPMux* const mux, uint32_t nth,
    const uint8_t* data, size_t size,
    const uint8_t* alpha_data, size_t alpha_size,
    uint32_t x_offset, uint32_t y_offset, uint32_t duration,
    int copy_data);

// TODO(urvang): Create a struct as follows to reduce argument list size:
// typedef struct {
//  int nth;
//  uint8_t* data;
//  uint32_t data_size;
//  uint8_t* alpha;
//  uint32_t alpha_size;
//  uint32_t x_offset, y_offset;
//  uint32_t duration;
// } FrameInfo;

// Gets a reference to the nth animation frame from the mux object.
// The caller should NOT free the returned data.
// nth=0 has a special meaning - last position.
// Parameters:
//   mux - (in) object from which the info is to be fetched
//   nth - (in) index of the frame in the mux object
//   image - (out) the image data
//   alpha - (out) the alpha data corresponding to frame image (if present)
//   x_offset - (out) x-offset of the returned frame
//   y_offset - (out) y-offset of the returned frame
//   duration - (out) duration of the returned frame (in milliseconds)
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if either mux, image, x_offset,
//                               y_offset, or duration is NULL
//   WEBP_MUX_NOT_FOUND - if there are less than nth frames in the mux object.
//   WEBP_MUX_BAD_DATA - if nth frame chunk in mux is invalid.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxGetFrame(
    const WebPMux* const mux, uint32_t nth,
    WebPData* const image, WebPData* const alpha,
    uint32_t* x_offset, uint32_t* y_offset, uint32_t* duration);

// Deletes an animation frame from the mux object.
// nth=0 has a special meaning - last position.
// Parameters:
//   mux - (in/out) object from which a frame is to be deleted
//   nth - (in) The position from which the frame is to be deleted
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL
//   WEBP_MUX_NOT_FOUND - If there are less than nth frames in the mux object
//                        before deletion.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxDeleteFrame(WebPMux* const mux, uint32_t nth);

// Sets the animation loop count in the mux object. Any existing loop count
// value(s) will be removed.
// Parameters:
//   mux - (in/out) object in which loop chunk is to be set/added
//   loop_count - (in) animation loop count value.
//                Note that loop_count of zero denotes infinite loop.
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL
//   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxSetLoopCount(WebPMux* const mux,
                                              uint32_t loop_count);

// Gets the animation loop count from the mux object.
// Parameters:
//   mux - (in) object from which the loop count is to be fetched
//   loop_count - (out) the loop_count value present in the LOOP chunk
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if either of mux or loop_count is NULL
//   WEBP_MUX_NOT_FOUND - if loop chunk is not present in mux object.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxGetLoopCount(const WebPMux* const mux,
                                              uint32_t* loop_count);

//------------------------------------------------------------------------------
// Tiling.

// Adds a tile to the mux object.
// nth=0 has a special meaning - last position.
// Parameters:
//   mux - (in/out) object to which a tile is to be added
//   nth - (in) The position at which the tile is to be added.
//   data - (in) the raw VP8 image data corresponding to tile image.  The data
//          can be either a VP8 bitstream or a single-image WebP file
//          (non-animated & non-tiled)
//   size - (in) size of tile chunk data
//   alpha_data - (in) the alpha data corresponding to tile image (if present)
//   alpha_size - (in) size of alpha chunk data
//   x_offset - (in) x-offset of the tile to be added
//   y_offset - (in) y-offset of the tile to be added
//   copy_data - (in) value 1 indicates given data WILL copied to the mux, and
//               value 0 indicates data will NOT be copied.
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL or data is NULL
//   WEBP_MUX_NOT_FOUND - If we have less than (nth-1) tiles before adding.
//   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxAddTile(
    WebPMux* const mux, uint32_t nth,
    const uint8_t* data, size_t size,
    const uint8_t* alpha_data, size_t alpha_size,
    uint32_t x_offset, uint32_t y_offset,
    int copy_data);

// Gets a reference to the nth tile from the mux object.
// The caller should NOT free the returned data.
// nth=0 has a special meaning - last position.
// Parameters:
//   mux - (in) object from which the info is to be fetched
//   nth - (in) index of the tile in the mux object
//   image - (out) the image data
//   alpha - (out) the alpha data corresponding to tile image (if present)
//   x_offset - (out) x-offset of the returned tile
//   y_offset - (out) y-offset of the returned tile
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if either mux, image, x_offset or
//                               y_offset is NULL
//   WEBP_MUX_NOT_FOUND - if there are less than nth tiles in the mux object.
//   WEBP_MUX_BAD_DATA - if nth tile chunk in mux is invalid.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxGetTile(
    const WebPMux* const mux, uint32_t nth,
    WebPData* const image, WebPData* const alpha,
    uint32_t* x_offset, uint32_t* y_offset);

// Deletes a tile from the mux object.
// nth=0 has a special meaning - last position
// Parameters:
//   mux - (in/out) object from which a tile is to be deleted
//   nth - (in) The position from which the tile is to be deleted
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL
//   WEBP_MUX_NOT_FOUND - If there are less than nth tiles in the mux object
//                        before deletion.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxDeleteTile(WebPMux* const mux, uint32_t nth);

//------------------------------------------------------------------------------
// Misc Utilities.

// Gets the feature flags from the mux object.
// Parameters:
//   mux - (in) object from which the features are to be fetched
//   flags - (out) the flags specifying which features are present in the
//           mux object. This will be an OR of various flag values.
//           Enum 'FeatureFlags' can be used to test for individual flag values.
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL or flags is NULL
//   WEBP_MUX_NOT_FOUND - if VP8X chunk is not present in mux object.
//   WEBP_MUX_BAD_DATA - if VP8X chunk in mux is invalid.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxGetFeatures(const WebPMux* const mux,
                                             uint32_t* flags);

// Gets number of chunks having tag value tag in the mux object.
// Parameters:
//   mux - (in) object from which the info is to be fetched
//   tag - (in) tag name specifying the type of chunk
//   num_elements - (out) number of chunks corresponding to the specified tag
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if either mux, tag or num_elements is NULL
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxNumNamedElements(const WebPMux* const mux,
                                                  const char* tag,
                                                  int* num_elements);

// Assembles all chunks in WebP RIFF format and returns in output_data.
// This function also validates the mux object.
// The content of '*output_data' is allocated using malloc(), and NOT
// owned by the 'mux' object.
// It MUST be deallocated by the caller by calling free().
// Parameters:
//   mux - (in/out) object whose chunks are to be assembled
//   output_data - (out) byte array where assembled WebP data is returned
//   output_size - (out) size of returned data
// Returns:
//   WEBP_MUX_BAD_DATA - if mux object is invalid.
//   WEBP_MUX_INVALID_ARGUMENT - if either mux, output_data or output_size is
//                               NULL.
//   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
//   WEBP_MUX_OK - on success
WEBP_EXTERN(WebPMuxError) WebPMuxAssemble(WebPMux* const mux,
                                          uint8_t** output_data,
                                          size_t* output_size);

//------------------------------------------------------------------------------

#if defined(__cplusplus) || defined(c_plusplus)
}    // extern "C"
#endif

#endif  /* WEBP_WEBP_MUX_H_ */