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v0.4
src/internal.h
242 строки
9 KB
Timothy B. Terriberry
Add a gain control API.
15 июл 2013, 05:50
15 июл 2013, 05:50
7aea3ca
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/******************************************************************** * * * THIS FILE IS PART OF THE libopusfile SOFTWARE CODEC SOURCE CODE. * * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * * * * THE libopusfile SOURCE CODE IS (C) COPYRIGHT 2012 * * by the Xiph.Org Foundation and contributors http://www.xiph.org/ * * * ********************************************************************/ #if !defined(_opusfile_internal_h) # define _opusfile_internal_h (1) # if !defined(_REENTRANT) # define _REENTRANT # endif # if !defined(_GNU_SOURCE) # define _GNU_SOURCE # endif # if !defined(_LARGEFILE_SOURCE) # define _LARGEFILE_SOURCE # endif # if !defined(_LARGEFILE64_SOURCE) # define _LARGEFILE64_SOURCE # endif # if !defined(_FILE_OFFSET_BITS) # define _FILE_OFFSET_BITS 64 # endif # include <stdlib.h> # include <opusfile.h> typedef struct OggOpusLink OggOpusLink; # if defined(OP_FIXED_POINT) typedef opus_int16 op_sample; # else typedef float op_sample; /*We're using this define to test for libopus 1.1 or later until libopus provides a better mechanism.*/ # if defined(OPUS_GET_EXPERT_FRAME_DURATION_REQUEST) /*Enable soft clipping prevention in 16-bit decodes.*/ # define OP_SOFT_CLIP (1) # endif # endif # if OP_GNUC_PREREQ(4,2) /*Disable excessive warnings about the order of operations.*/ # pragma GCC diagnostic ignored "-Wparentheses" # elif defined(_MSC_VER) /*Disable excessive warnings about the order of operations.*/ # pragma warning(disable:4554) /*Disable warnings about "deprecated" POSIX functions.*/ # pragma warning(disable:4996) # endif # if OP_GNUC_PREREQ(3,0) /*Another alternative is (__builtin_constant_p(_x)?!!(_x):__builtin_expect(!!(_x),1)) but that evaluates _x multiple times, which may be bad.*/ # define OP_LIKELY(_x) (__builtin_expect(!!(_x),1)) # define OP_UNLIKELY(_x) (__builtin_expect(!!(_x),0)) # else # define OP_LIKELY(_x) (!!(_x)) # define OP_UNLIKELY(_x) (!!(_x)) # endif # if defined(OP_ENABLE_ASSERTIONS) # if OP_GNUC_PREREQ(2,5)||__SUNPRO_C>=0x590 __attribute__((noreturn)) # endif void op_fatal_impl(const char *_str,const char *_file,int _line); # define OP_FATAL(_str) (op_fatal_impl(_str,__FILE__,__LINE__)) # define OP_ASSERT(_cond) \ do{ \ if(OP_UNLIKELY(!(_cond)))OP_FATAL("assertion failed: " #_cond); \ } \ while(0) # define OP_ALWAYS_TRUE(_cond) OP_ASSERT(_cond) # else # define OP_FATAL(_str) abort() # define OP_ASSERT(_cond) # define OP_ALWAYS_TRUE(_cond) ((void)(_cond)) # endif # define OP_INT64_MAX (2*(((ogg_int64_t)1<<62)-1)|1) # define OP_INT64_MIN (-OP_INT64_MAX-1) # define OP_MIN(_a,_b) ((_a)<(_b)?(_a):(_b)) # define OP_MAX(_a,_b) ((_a)>(_b)?(_a):(_b)) # define OP_CLAMP(_lo,_x,_hi) (OP_MAX(_lo,OP_MIN(_x,_hi))) /*Advance a file offset by the given amount, clamping against OP_INT64_MAX. This is used to advance a known offset by things like OP_CHUNK_SIZE or OP_PAGE_SIZE_MAX, while making sure to avoid signed overflow. It assumes that both _offset and _amount are non-negative.*/ #define OP_ADV_OFFSET(_offset,_amount) \ (OP_MIN(_offset,OP_INT64_MAX-(_amount))+(_amount)) /*The maximum channel count for any mapping we'll actually decode.*/ # define OP_NCHANNELS_MAX (8) /*Initial state.*/ # define OP_NOTOPEN (0) /*We've found the first Opus stream in the first link.*/ # define OP_PARTOPEN (1) # define OP_OPENED (2) /*We've found the first Opus stream in the current link.*/ # define OP_STREAMSET (3) /*We've initialized the decoder for the chosen Opus stream in the current link.*/ # define OP_INITSET (4) /*Information cached for a single link in a chained Ogg Opus file. We choose the first Opus stream encountered in each link to play back (and require at least one).*/ struct OggOpusLink{ /*The byte offset of the first header page in this link.*/ opus_int64 offset; /*The byte offset of the first data page from the chosen Opus stream in this link (after the headers).*/ opus_int64 data_offset; /*The byte offset of the last page from the chosen Opus stream in this link. This is used when seeking to ensure we find a page before the last one, so that end-trimming calculations work properly. This is only valid for seekable sources.*/ opus_int64 end_offset; /*The granule position of the last sample. This is only valid for seekable sources.*/ ogg_int64_t pcm_end; /*The granule position before the first sample.*/ ogg_int64_t pcm_start; /*The serial number.*/ ogg_uint32_t serialno; /*The contents of the info header.*/ OpusHead head; /*The contents of the comment header.*/ OpusTags tags; }; struct OggOpusFile{ /*The callbacks used to access the data source.*/ OpusFileCallbacks callbacks; /*A FILE *, memory bufer, etc.*/ void *source; /*Whether or not we can seek with this data source.*/ int seekable; /*The number of links in this chained Ogg Opus file.*/ int nlinks; /*The cached information from each link in a chained Ogg Opus file. If source isn't seekable (e.g., it's a pipe), only the current link appears.*/ OggOpusLink *links; /*The number of serial numbers from a single link.*/ int nserialnos; /*The capacity of the list of serial numbers from a single link.*/ int cserialnos; /*Storage for the list of serial numbers from a single link.*/ ogg_uint32_t *serialnos; /*This is the current offset of the data processed by the ogg_sync_state. After a seek, this should be set to the target offset so that we can track the byte offsets of subsequent pages. After a call to op_get_next_page(), this will point to the first byte after that page.*/ opus_int64 offset; /*The total size of this data source, or -1 if it's unseekable.*/ opus_int64 end; /*Used to locate pages in the data source.*/ ogg_sync_state oy; /*One of OP_NOTOPEN, OP_PARTOPEN, OP_OPENED, OP_STREAMSET, OP_INITSET.*/ int ready_state; /*The current link being played back.*/ int cur_link; /*The number of decoded samples to discard from the start of decoding.*/ opus_int32 cur_discard_count; /*The granule position of the previous packet (current packet start time).*/ ogg_int64_t prev_packet_gp; /*The number of bytes read since the last bitrate query, including framing.*/ opus_int64 bytes_tracked; /*The number of samples decoded since the last bitrate query.*/ ogg_int64_t samples_tracked; /*Takes physical pages and welds them into a logical stream of packets.*/ ogg_stream_state os; /*Re-timestamped packets from a single page. Buffering these relies on the undocumented libogg behavior that ogg_packet pointers remain valid until the next page is submitted to the ogg_stream_state they came from.*/ ogg_packet op[255]; /*The index of the next packet to return.*/ int op_pos; /*The total number of packets available.*/ int op_count; /*Central working state for the packet-to-PCM decoder.*/ OpusMSDecoder *od; /*The stream count used to initialize the decoder.*/ int od_stream_count; /*The coupled stream count used to initialize the decoder.*/ int od_coupled_count; /*The channel count used to initialize the decoder.*/ int od_channel_count; /*The channel mapping used to initialize the decoder.*/ unsigned char od_mapping[OP_NCHANNELS_MAX]; /*The buffered data for one decoded packet.*/ op_sample *od_buffer; /*The current position in the decoded buffer.*/ int od_buffer_pos; /*The number of valid samples in the decoded buffer.*/ int od_buffer_size; /*The type of gain offset to apply. One of OP_HEADER_GAIN, OP_TRACK_GAIN, or OP_ABSOLUTE_GAIN.*/ int gain_type; /*The offset to apply to the gain.*/ opus_int32 gain_offset_q8; /*Internal state for soft clipping and dithering float->short output.*/ #if !defined(OP_FIXED_POINT) # if defined(OP_SOFT_CLIP) float clip_state[OP_NCHANNELS_MAX]; # endif float dither_a[OP_NCHANNELS_MAX*4]; float dither_b[OP_NCHANNELS_MAX*4]; opus_uint32 dither_seed; int dither_mute; /*The number of channels represented by the internal state. This gets set to 0 whenever anything that would prevent state propagation occurs (switching between the float/short APIs, or between the stereo/multistream APIs).*/ int state_channel_count; #endif }; int op_strncasecmp(const char *_a,const char *_b,int _n); #endif