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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_INT32_MAX (2*(((ogg_int32_t)1<<30)-1)|1)
+# define OP_INT32_MIN (-OP_INT32_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 application-provided packet decode callback.*/
+ op_decode_cb_func decode_cb;
+ /*The application-provided packet decode callback context.*/
+ void *decode_cb_ctx;
+ /*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;
+ int dither_disabled;
+ /*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