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src/Source/LibWebP/src/webp/mux.h  view on Meta::CPAN

// Assembles all chunks in WebP RIFF format and returns in 'assembled_data'.
// This function also validates the mux object.
// Note: The content of 'assembled_data' will be ignored and overwritten.
// Also, the content of 'assembled_data' is allocated using malloc(), and NOT
// owned by the 'mux' object. It MUST be deallocated by the caller by calling
// WebPDataClear(). It's always safe to call WebPDataClear() upon return,
// even in case of error.
// Parameters:
//   mux - (in/out) object whose chunks are to be assembled
//   assembled_data - (out) assembled WebP data
// Returns:
//   WEBP_MUX_BAD_DATA - if mux object is invalid.
//   WEBP_MUX_INVALID_ARGUMENT - if mux or assembled_data is NULL.
//   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxAssemble(WebPMux* mux,
                                          WebPData* assembled_data);

//------------------------------------------------------------------------------
// WebPAnimEncoder API
//
// This API allows encoding (possibly) animated WebP images.
//
// Code Example:
/*
  WebPAnimEncoderOptions enc_options;
  WebPAnimEncoderOptionsInit(&enc_options);
  // Tune 'enc_options' as needed.
  WebPAnimEncoder* enc = WebPAnimEncoderNew(width, height, &enc_options);
  while(<there are more frames>) {
    WebPConfig config;
    WebPConfigInit(&config);
    // Tune 'config' as needed.
    WebPAnimEncoderAdd(enc, frame, duration, &config);
  }
  WebPAnimEncoderAssemble(enc, webp_data);
  WebPAnimEncoderDelete(enc);
  // Write the 'webp_data' to a file, or re-mux it further.
*/

typedef struct WebPAnimEncoder WebPAnimEncoder;  // Main opaque object.

// Global options.
typedef struct {
  WebPMuxAnimParams anim_params;  // Animation parameters.
  int minimize_size;    // If true, minimize the output size (slow). Implicitly
                        // disables key-frame insertion.
  int kmin;
  int kmax;             // Minimum and maximum distance between consecutive key
                        // frames in the output. The library may insert some key
                        // frames as needed to satisfy this criteria.
                        // Note that these conditions should hold: kmax > kmin
                        // and kmin >= kmax / 2 + 1. Also, if kmin == 0, then
                        // key-frame insertion is disabled; and if kmax == 0,
                        // then all frames will be key-frames.
  int allow_mixed;      // If true, use mixed compression mode; may choose
                        // either lossy and lossless for each frame.

  // TODO(urvang): Instead of printing errors to STDERR, we should have an error
  // string attached to the encoder.
  int verbose;          // If true, print encoding info.
  uint32_t padding[4];  // Padding for later use.
} WebPAnimEncoderOptions;

// Internal, version-checked, entry point.
WEBP_EXTERN(int) WebPAnimEncoderOptionsInitInternal(
    WebPAnimEncoderOptions*, int);

// Should always be called, to initialize a fresh WebPAnimEncoderOptions
// structure before modification. Returns false in case of version mismatch.
// WebPAnimEncoderOptionsInit() must have succeeded before using the 'options'
// object.
static WEBP_INLINE int WebPAnimEncoderOptionsInit(
    WebPAnimEncoderOptions* enc_options) {
  return WebPAnimEncoderOptionsInitInternal(enc_options, WEBP_MUX_ABI_VERSION);
}

// Internal, version-checked, entry point.
WEBP_EXTERN(WebPAnimEncoder*) WebPAnimEncoderNewInternal(
    int, int, const WebPAnimEncoderOptions*, int);

// Creates and initializes a WebPAnimEncoder object.
// Parameters:
//   width/height - (in) canvas width and height of the animation.
//   encoder_options - (in) encoding options; can be passed NULL to pick
//                     reasonable defaults.
// Returns:
//   A pointer to the newly created WebPAnimEncoder object.
//   Or NULL in case of memory error.
static WEBP_INLINE WebPAnimEncoder* WebPAnimEncoderNew(
    int width, int height, const WebPAnimEncoderOptions* enc_options) {
  return WebPAnimEncoderNewInternal(width, height, enc_options,
                                    WEBP_MUX_ABI_VERSION);
}

// Optimize the given frame for WebP, encode it and add it to the
// WebPAnimEncoder object.
// Parameters:
//   enc - (in/out) object to which the frame is to be added.
//   frame - (in/out) frame data in ARGB or YUVA format.
//   duration - (in) frame duration
//   config - (in) encoding options; can be passed NULL to pick
//            reasonable defaults.
// Returns:
//   On error, returns false and frame->error_code is set appropriately.
//   Otherwise, returns true.
WEBP_EXTERN(int) WebPAnimEncoderAdd(
    WebPAnimEncoder* enc, WebPPicture* frame, int duration,
    const WebPConfig* config);

// Assemble all frames added so far into a WebP bitstream.
// Parameters:
//   enc - (in/out) object from which the frames are to be assembled.
//   webp_data - (out) generated WebP bitstream.
// Returns:
//   True on success.
WEBP_EXTERN(int) WebPAnimEncoderAssemble(WebPAnimEncoder* enc,
                                         WebPData* webp_data);

// Deletes the WebPAnimEncoder object.