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| -rw-r--r-- | src/lib/ffmpeg-2.1/swresample.pas | 288 |
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 new file mode 100644 index 00000000..b6722df1 --- /dev/null +++ b/src/lib/ffmpeg-2.1/swresample.pas @@ -0,0 +1,288 @@ +(* + * 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. + |