First try in the translation of swresample

git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/trunk@3047 b956fd51-792f-4845-bead-9b4dfca2ff2c

1 files changed, 288 insertions, 0 deletions

diff --git a/src/lib/ffmpeg-2.1/swresample.pas b/src/lib/ffmpeg-2.1/swresample.pas
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+(*
+ * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * This is a part of Pascal porting of ffmpeg.
+ * - Originally by Victor Zinetz for Delphi and Free Pascal on Windows.
+ * - For Mac OS X, some modifications were made by The Creative CAT, denoted as CAT
+ *   in the source codes.
+ * - Changes and updates by the UltraStar Deluxe Team
+ *
+ * Conversions of
+ *
+ * libswresample/swresample.h:
+ * version: 0.17.104
+ *
+ *)
+
+
+unit swresample;
+
+{$IFDEF FPC}
+  {$MODE DELPHI}
+  {$PACKENUM 4}    (* use 4-byte enums *)
+  {$PACKRECORDS C} (* C/C++-compatible record packing *)
+{$ELSE}
+  {$MINENUMSIZE 4} (* use 4-byte enums *)
+{$ENDIF}
+
+{$IFDEF DARWIN}
+  {$linklib swresample}
+{$ENDIF}
+
+interface
+
+uses
+    ctypes,
+    rational,
+    {$IFDEF UNIX}
+    BaseUnix,
+    {$ENDIF}
+    UConfig;
+
+const
+
+  {$IF LIBRESAMPLE_VERSION_MAJOR <  1}
+  SWR_CH_MAX = 32;  (* < Maximum number of channels *)
+  {$ENDIF}
+  SWR_FLAG_RESAMPLE = 1; (* < Force resampling even if equal sample rate *)
+
+type
+  TSwrDitherType = (
+    SWR_DITHER_NONE = 0,
+    SWR_DITHER_RECTANGULAR,
+    SWR_DITHER_TRIANGULAR,
+    SWR_DITHER_TRIANGULAR_HIGHPASS,
+
+    SWR_DITHER_NS = 64,         (* < not part of API/ABI *)
+    SWR_DITHER_NS_LIPSHITZ,
+    SWR_DITHER_NS_F_WEIGHTED,
+    SWR_DITHER_NS_MODIFIED_E_WEIGHTED,
+    SWR_DITHER_NS_IMPROVED_E_WEIGHTED,
+    SWR_DITHER_NS_SHIBATA,
+    SWR_DITHER_NS_LOW_SHIBATA,
+    SWR_DITHER_NS_HIGH_SHIBATA,
+    SWR_DITHER_NB              (* < not part of API/ABI *)
+  );
+
+  TSwrEngine = (
+    SWR_ENGINE_SWR,             (* < SW Resampler *)
+    SWR_ENGINE_SOXR,            (* < SoX Resampler *)
+    SWR_ENGINE_NB              (* < not part of API/ABI *)
+  );
+
+  TSwrFilterType = (
+    SWR_FILTER_TYPE_CUBIC,              (* < Cubic *)
+    SWR_FILTER_TYPE_BLACKMAN_NUTTALL,   (* < Blackman Nuttall Windowed Sinc *)
+    SWR_FILTER_TYPE_KAISER             (* < Kaiser Windowed Sinc *)
+  );
+
+  PPSwrContext= ^PSwrContext;
+  PSwrContext = ^TSwrContext;
+  TSwrContext = record
+  end;
+
+  (**
+   * Get the AVClass for swrContext. It can be used in combination with
+   * AV_OPT_SEARCH_FAKE_OBJ for examining options.
+   *
+   * @see av_opt_find().
+  *)
+  function swr_get_class(): PAVClass;
+  cdecl; external swresample;
+
+  (**
+   * Allocate SwrContext.
+   *
+   * If you use this function you will need to set the parameters (manually or
+   * with swr_alloc_set_opts()) before calling swr_init().
+   *
+   * @see swr_alloc_set_opts(), swr_init(), swr_free()
+   * @return NULL on error, allocated context otherwise
+  *)
+
+  function swr_alloc(): PSwrContext;
+  cdecl; external swresample;
+
+  (**
+   * Initialize context after user parameters have been set.
+   *
+   * @return AVERROR error code in case of failure.
+  *)
+  function swr_init(s : PSwrContext): cint;
+  cdecl; external swresample;
+
+  (**
+   * Allocate SwrContext if needed and set/reset common parameters.
+   *
+   * This function does not require s to be allocated with swr_alloc(). On the
+   * other hand, swr_alloc() can use swr_alloc_set_opts() to set the parameters
+   * on the allocated context.
+   *
+   * @param s               Swr context, can be NULL
+   * @param out_ch_layout   output channel layout (AV_CH_LAYOUT_* )
+   * @param out_sample_fmt  output sample format (AV_SAMPLE_FMT_* ).
+   * @param out_sample_rate output sample rate (frequency in Hz)
+   * @param in_ch_layout    input channel layout (AV_CH_LAYOUT_* )
+   * @param in_sample_fmt   input sample format (AV_SAMPLE_FMT_* ).
+   * @param in_sample_rate  input sample rate (frequency in Hz)
+   * @param log_offset      logging level offset
+   * @param log_ctx         parent logging context, can be NULL
+   *
+   * @see swr_init(), swr_free()
+   * @return NULL on error, allocated context otherwise
+  *)
+  function swr_alloc_set_opts(s : PSwrContext;
+                                        out_ch_layout: cint64; out_sample_fmt: TAVSampleFormat; out_sample_rate: cint;
+                                        in_ch_layout: cint64; in_sample_fmt: TAVSampleFormat; in_sample_rate: cint;
+                                        log_offset: cint; log_ctx: pointer): PSwrContext;
+  cdecl; external swresample;
+
+  (**
+   * Free the given SwrContext and set the pointer to NULL.
+  *)
+  procedure swr_free(s: PPSwrContext);
+  cdecl; external swresample;
+
+  (**
+   * Convert audio.
+   *
+   * in and in_count can be set to 0 to flush the last few samples out at the
+   * end.
+   *
+   * If more input is provided than output space then the input will be buffered.
+   * You can avoid this buffering by providing more output space than input.
+   * Convertion will run directly without copying whenever possible.
+   *
+   * @param s         allocated Swr context, with parameters set
+   * @param out       output buffers, only the first one need be set in case of packed audio
+   * @param out_count amount of space available for output in samples per channel
+   * @param in        input buffers, only the first one need to be set in case of packed audio
+   * @param in_count  number of input samples available in one channel
+   *
+   * @return number of samples output per channel, negative value on error
+  *)
+  function swr_convert(s: PSwrContext; out_: PByte; out_count: cint;
+                                  {const} in_: PByte; in_count: cint): cint;
+  cdecl; external swresample;
+
+  (**
+   * Convert the next timestamp from input to output
+   * timestamps are in 1/(in_sample_rate * out_sample_rate) units.
+   *
+   * @note There are 2 slightly differently behaving modes.
+   *       First is when automatic timestamp compensation is not used, (min_compensation >= FLT_MAX)
+   *              in this case timestamps will be passed through with delays compensated
+   *       Second is when automatic timestamp compensation is used, (min_compensation < FLT_MAX)
+   *              in this case the output timestamps will match output sample numbers
+   *
+   * @param pts   timestamp for the next input sample, INT64_MIN if unknown
+   * @return the output timestamp for the next output sample
+  *)
+  function swr_next_pts(s: PSwrContext; pts: cint): cint64;
+  cdecl; external swresample;
+
+  (**
+   * Activate resampling compensation.
+  *)
+  function swr_set_compensation(s: PSwrContext; sample_delta: cint; compensation_distance: cint): cint;
+  cdecl; external swresample;
+
+  (**
+   * Set a customized input channel mapping.
+   *
+   * @param s           allocated Swr context, not yet initialized
+   * @param channel_map customized input channel mapping (array of channel
+   *                    indexes, -1 for a muted channel)
+   * @return AVERROR error code in case of failure.
+   *)
+  function swr_set_channel_mapping(s: PSwrContext; {const} channel_map: pcint): cint;
+  cdecl; external swresample;
+
+  (**
+   * Set a customized remix matrix.
+   *
+   * @param s       allocated Swr context, not yet initialized
+   * @param matrix  remix coefficients; matrix[i + stride * o] is
+   *                the weight of input channel i in output channel o
+   * @param stride  offset between lines of the matrix
+   * @return  AVERROR error code in case of failure.
+  *)
+  function swr_set_matrix(s: PSwrContext; {const} matrix: pcdouble; stride: cint): cint;
+  cdecl; external swresample;
+
+  (**
+   * Drops the specified number of output samples.
+  *)
+  function swr_drop_output(s: PSwrContext; count: cint): cint;
+  cdecl; external swresample;
+
+  (**
+   * Injects the specified number of silence samples.
+  *)
+  function swr_inject_silence(s: PSwrContext; count: cint): cint;
+  cdecl; external swresample;
+
+  (**
+   * Gets the delay the next input sample will experience relative to the next output sample.
+   *
+   * Swresample can buffer data if more input has been provided than available
+   * output space, also converting between sample rates needs a delay.
+   * This function returns the sum of all such delays.
+   * The exact delay is not necessarily an integer value in either input or
+   * output sample rate. Especially when downsampling by a large value, the
+   * output sample rate may be a poor choice to represent the delay, similarly
+   * for upsampling and the input sample rate.
+   *
+   * @param s     swr context
+   * @param base  timebase in which the returned delay will be
+   *              if its set to 1 the returned delay is in seconds
+   *              if its set to 1000 the returned delay is in milli seconds
+   *              if its set to the input sample rate then the returned delay is in input samples
+   *              if its set to the output sample rate then the returned delay is in output samples
+   *              an exact rounding free delay can be found by using LCM(in_sample_rate, out_sample_rate)
+   * @returns     the delay in 1/base units.
+  *)
+  function swr_get_delay(s: PSwrContext; base: cint64): cint64;
+  cdecl; external swresample;
+
+  (**
+   * Return the LIBSWRESAMPLE_VERSION_INT constant.
+  *)
+  function swresample_version(): cuint;
+  cdecl; external swresample;
+
+  (**
+   * Return the swr build-time configuration.
+  *)
+  function swresample_configuration(): cuchar;
+  cdecl; external swresample;
+
+  (**
+   * Return the swr license.
+  *)
+  function swresample_license(): cuchar;
+    cdecl; external swresample;
+
+  (**
+   * @
+   *)
+
+
+implementation
+
+end.
+