250 lines
9.3 KiB
C
250 lines
9.3 KiB
C
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/********************************************************************
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* *
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* THIS FILE IS PART OF THE libopusfile SOFTWARE CODEC SOURCE CODE. *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE libopusfile SOURCE CODE IS (C) COPYRIGHT 2012 *
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* by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
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* *
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********************************************************************/
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#if !defined(_opusfile_internal_h)
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# define _opusfile_internal_h (1)
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# if !defined(_REENTRANT)
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# define _REENTRANT
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# endif
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# if !defined(_GNU_SOURCE)
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# define _GNU_SOURCE
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# endif
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# if !defined(_LARGEFILE_SOURCE)
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# define _LARGEFILE_SOURCE
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# endif
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# if !defined(_LARGEFILE64_SOURCE)
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# define _LARGEFILE64_SOURCE
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# endif
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# if !defined(_FILE_OFFSET_BITS)
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# define _FILE_OFFSET_BITS 64
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# endif
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# include <stdlib.h>
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# include <opus/opusfile.h>
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typedef struct OggOpusLink OggOpusLink;
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# if defined(OPUS_FIXED_POINT)
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typedef opus_int16 op_sample;
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# else
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typedef float op_sample;
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/*We're using this define to test for libopus 1.1 or later until libopus
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provides a better mechanism.*/
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# if defined(OPUS_GET_EXPERT_FRAME_DURATION_REQUEST)
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/*Enable soft clipping prevention in 16-bit decodes.*/
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# define OP_SOFT_CLIP (1)
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# endif
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# endif
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# if OP_GNUC_PREREQ(4,2)
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/*Disable excessive warnings about the order of operations.*/
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# pragma GCC diagnostic ignored "-Wparentheses"
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# elif defined(_MSC_VER)
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/*Disable excessive warnings about the order of operations.*/
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# pragma warning(disable:4554)
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/*Disable warnings about "deprecated" POSIX functions.*/
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# pragma warning(disable:4996)
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# endif
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# if OP_GNUC_PREREQ(3,0)
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/*Another alternative is
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(__builtin_constant_p(_x)?!!(_x):__builtin_expect(!!(_x),1))
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but that evaluates _x multiple times, which may be bad.*/
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# define OP_LIKELY(_x) (__builtin_expect(!!(_x),1))
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# define OP_UNLIKELY(_x) (__builtin_expect(!!(_x),0))
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# else
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# define OP_LIKELY(_x) (!!(_x))
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# define OP_UNLIKELY(_x) (!!(_x))
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# endif
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# if defined(OP_ENABLE_ASSERTIONS)
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# if OP_GNUC_PREREQ(2,5)||__SUNPRO_C>=0x590
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__attribute__((noreturn))
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# endif
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void op_fatal_impl(const char *_str,const char *_file,int _line);
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# define OP_FATAL(_str) (op_fatal_impl(_str,__FILE__,__LINE__))
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# define OP_ASSERT(_cond) \
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do{ \
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if(OP_UNLIKELY(!(_cond)))OP_FATAL("assertion failed: " #_cond); \
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} \
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while(0)
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# define OP_ALWAYS_TRUE(_cond) OP_ASSERT(_cond)
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# else
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# define OP_FATAL(_str) abort()
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# define OP_ASSERT(_cond)
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# define OP_ALWAYS_TRUE(_cond) ((void)(_cond))
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# endif
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# define OP_INT64_MAX (2*(((ogg_int64_t)1<<62)-1)|1)
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# define OP_INT64_MIN (-OP_INT64_MAX-1)
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# define OP_INT32_MAX (2*(((ogg_int32_t)1<<30)-1)|1)
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# define OP_INT32_MIN (-OP_INT32_MAX-1)
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# define OP_MIN(_a,_b) ((_a)<(_b)?(_a):(_b))
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# define OP_MAX(_a,_b) ((_a)>(_b)?(_a):(_b))
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# define OP_CLAMP(_lo,_x,_hi) (OP_MAX(_lo,OP_MIN(_x,_hi)))
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/*Advance a file offset by the given amount, clamping against OP_INT64_MAX.
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This is used to advance a known offset by things like OP_CHUNK_SIZE or
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OP_PAGE_SIZE_MAX, while making sure to avoid signed overflow.
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It assumes that both _offset and _amount are non-negative.*/
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#define OP_ADV_OFFSET(_offset,_amount) \
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(OP_MIN(_offset,OP_INT64_MAX-(_amount))+(_amount))
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/*The maximum channel count for any mapping we'll actually decode.*/
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# define OP_NCHANNELS_MAX (8)
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/*Initial state.*/
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# define OP_NOTOPEN (0)
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/*We've found the first Opus stream in the first link.*/
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# define OP_PARTOPEN (1)
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# define OP_OPENED (2)
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/*We've found the first Opus stream in the current link.*/
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# define OP_STREAMSET (3)
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/*We've initialized the decoder for the chosen Opus stream in the current
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link.*/
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# define OP_INITSET (4)
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/*Information cached for a single link in a chained Ogg Opus file.
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We choose the first Opus stream encountered in each link to play back (and
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require at least one).*/
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struct OggOpusLink{
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/*The byte offset of the first header page in this link.*/
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opus_int64 offset;
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/*The byte offset of the first data page from the chosen Opus stream in this
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link (after the headers).*/
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opus_int64 data_offset;
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/*The byte offset of the last page from the chosen Opus stream in this link.
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This is used when seeking to ensure we find a page before the last one, so
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that end-trimming calculations work properly.
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This is only valid for seekable sources.*/
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opus_int64 end_offset;
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/*The granule position of the last sample.
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This is only valid for seekable sources.*/
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ogg_int64_t pcm_end;
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/*The granule position before the first sample.*/
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ogg_int64_t pcm_start;
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/*The serial number.*/
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ogg_uint32_t serialno;
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/*The contents of the info header.*/
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OpusHead head;
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/*The contents of the comment header.*/
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OpusTags tags;
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};
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struct OggOpusFile{
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/*The callbacks used to access the data source.*/
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OpusFileCallbacks callbacks;
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/*A FILE *, memory bufer, etc.*/
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void *source;
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/*Whether or not we can seek with this data source.*/
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int seekable;
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/*The number of links in this chained Ogg Opus file.*/
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int nlinks;
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/*The cached information from each link in a chained Ogg Opus file.
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If source isn't seekable (e.g., it's a pipe), only the current link
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appears.*/
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OggOpusLink *links;
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/*The number of serial numbers from a single link.*/
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int nserialnos;
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/*The capacity of the list of serial numbers from a single link.*/
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int cserialnos;
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/*Storage for the list of serial numbers from a single link.*/
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ogg_uint32_t *serialnos;
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/*This is the current offset of the data processed by the ogg_sync_state.
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After a seek, this should be set to the target offset so that we can track
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the byte offsets of subsequent pages.
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After a call to op_get_next_page(), this will point to the first byte after
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that page.*/
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opus_int64 offset;
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/*The total size of this data source, or -1 if it's unseekable.*/
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opus_int64 end;
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/*Used to locate pages in the data source.*/
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ogg_sync_state oy;
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/*One of OP_NOTOPEN, OP_PARTOPEN, OP_OPENED, OP_STREAMSET, OP_INITSET.*/
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int ready_state;
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/*The current link being played back.*/
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int cur_link;
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/*The number of decoded samples to discard from the start of decoding.*/
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opus_int32 cur_discard_count;
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/*The granule position of the previous packet (current packet start time).*/
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ogg_int64_t prev_packet_gp;
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/*The number of bytes read since the last bitrate query, including framing.*/
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opus_int64 bytes_tracked;
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/*The number of samples decoded since the last bitrate query.*/
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ogg_int64_t samples_tracked;
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/*Takes physical pages and welds them into a logical stream of packets.*/
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ogg_stream_state os;
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/*Re-timestamped packets from a single page.
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Buffering these relies on the undocumented libogg behavior that ogg_packet
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pointers remain valid until the next page is submitted to the
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ogg_stream_state they came from.*/
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ogg_packet op[255];
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/*The index of the next packet to return.*/
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int op_pos;
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/*The total number of packets available.*/
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int op_count;
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/*Central working state for the packet-to-PCM decoder.*/
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OpusMSDecoder *od;
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/*The application-provided packet decode callback.*/
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op_decode_cb_func decode_cb;
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/*The application-provided packet decode callback context.*/
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void *decode_cb_ctx;
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/*The stream count used to initialize the decoder.*/
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int od_stream_count;
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/*The coupled stream count used to initialize the decoder.*/
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int od_coupled_count;
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/*The channel count used to initialize the decoder.*/
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int od_channel_count;
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/*The channel mapping used to initialize the decoder.*/
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unsigned char od_mapping[OP_NCHANNELS_MAX];
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/*The buffered data for one decoded packet.*/
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op_sample *od_buffer;
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/*The current position in the decoded buffer.*/
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int od_buffer_pos;
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/*The number of valid samples in the decoded buffer.*/
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int od_buffer_size;
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/*The type of gain offset to apply.
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One of OP_HEADER_GAIN, OP_TRACK_GAIN, or OP_ABSOLUTE_GAIN.*/
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int gain_type;
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/*The offset to apply to the gain.*/
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opus_int32 gain_offset_q8;
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/*Internal state for soft clipping and dithering float->short output.*/
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#if !defined(OPUS_FIXED_POINT)
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# if defined(OP_SOFT_CLIP)
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float clip_state[OP_NCHANNELS_MAX];
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# endif
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float dither_a[OP_NCHANNELS_MAX*4];
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float dither_b[OP_NCHANNELS_MAX*4];
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opus_uint32 dither_seed;
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int dither_mute;
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int dither_disabled;
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/*The number of channels represented by the internal state.
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This gets set to 0 whenever anything that would prevent state propagation
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occurs (switching between the float/short APIs, or between the
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stereo/multistream APIs).*/
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int state_channel_count;
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#endif
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};
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int op_strncasecmp(const char *_a,const char *_b,int _n);
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#endif
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