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/*
* @DEC_COPYRIGHT@ *//*
* HISTORY * $Log: slib_audio.c,v $ * Revision 1.1.6.14 1996/12/13 18:19:06 Hans_Graves * Added initialization of AudioPTimeBase. * [1996/12/13 18:07:26 Hans_Graves] * * Revision 1.1.6.13 1996/12/04 22:34:30 Hans_Graves * Make AC3 detection in audio streams more accurate. * [1996/12/04 22:19:21 Hans_Graves] * * Revision 1.1.6.12 1996/11/18 23:07:34 Hans_Graves * Make use of presentation timestamps. Make seeking time-based. * [1996/11/18 22:47:36 Hans_Graves] * * Revision 1.1.6.11 1996/11/11 18:21:06 Hans_Graves * Added AC3 support for multiplexed streams. * [1996/11/11 18:00:25 Hans_Graves] * * Revision 1.1.6.10 1996/11/08 21:51:04 Hans_Graves * Added AC3 support. Better seperation of stream types. * [1996/11/08 21:28:01 Hans_Graves] * * Revision 1.1.6.9 1996/10/28 17:32:30 Hans_Graves * MME-1402, 1431, 1435: Timestamp related changes. * [1996/10/28 17:23:01 Hans_Graves] * * Revision 1.1.6.8 1996/10/15 17:34:11 Hans_Graves * Added MPEG-2 Program Stream support. Fix MPEG-2 not skipping audio. * [1996/10/15 17:31:11 Hans_Graves] * * Revision 1.1.6.7 1996/09/29 22:19:39 Hans_Graves * Removed SLIB_MODE_DECOMPRESS_QUERY. * [1996/09/29 21:33:10 Hans_Graves] * * Revision 1.1.6.6 1996/09/25 19:16:46 Hans_Graves * Added SLIB_INTERNAL define. * [1996/09/25 19:01:51 Hans_Graves] * * Revision 1.1.6.5 1996/09/18 23:46:37 Hans_Graves * Use slibSetMaxInput under MPEG * [1996/09/18 22:03:03 Hans_Graves] * * Revision 1.1.6.4 1996/05/24 12:39:52 Hans_Graves * Disable debugging printfs * [1996/05/24 12:39:37 Hans_Graves] * * Revision 1.1.6.3 1996/05/23 18:46:37 Hans_Graves * Merge fixes MME-1292, MME-1293, and MME-1304. * [1996/05/23 18:45:22 Hans_Graves] * * Revision 1.1.6.2 1996/05/10 21:17:20 Hans_Graves * Fix calculation of audio lengths (NT) * [1996/05/10 20:44:27 Hans_Graves] * * Revision 1.1.4.4 1996/04/22 15:04:53 Hans_Graves * Added slibValidateAudioParams() * [1996/04/22 14:43:35 Hans_Graves] * * Revision 1.1.4.3 1996/04/01 16:23:14 Hans_Graves * NT porting * [1996/04/01 16:15:58 Hans_Graves] * * Revision 1.1.4.2 1996/03/29 22:21:33 Hans_Graves * Added MPEG/JPEG/H261_SUPPORT ifdefs * [1996/03/29 21:56:58 Hans_Graves] * * Revision 1.1.2.12 1996/02/21 22:52:45 Hans_Graves * Fixed MPEG 2 systems stuff * [1996/02/21 22:51:03 Hans_Graves] * * Revision 1.1.2.11 1996/02/19 18:03:56 Hans_Graves * Fixed a number of MPEG related bugs * [1996/02/19 17:57:40 Hans_Graves] * * Revision 1.1.2.10 1996/02/13 18:47:48 Hans_Graves * Added slibSkipAudio() * [1996/02/13 18:41:27 Hans_Graves] * * Revision 1.1.2.9 1996/02/07 23:23:56 Hans_Graves * Added SEEK_EXACT. Fixed most frame counting problems. * [1996/02/07 23:20:31 Hans_Graves] * * Revision 1.1.2.8 1996/02/02 17:36:03 Hans_Graves * Enhanced audio info. Cleaned up API * [1996/02/02 17:29:46 Hans_Graves] * * Revision 1.1.2.7 1996/01/31 14:50:39 Hans_Graves * Renamed SLIB_TYPE_WAVE to SLIB_TYPE_PCM_WAVE * [1996/01/31 14:50:27 Hans_Graves] * * Revision 1.1.2.6 1996/01/15 16:26:29 Hans_Graves * Added MPEG 1 Audio compression support * [1996/01/15 15:46:07 Hans_Graves] * * Revision 1.1.2.5 1996/01/11 16:17:31 Hans_Graves * Added MPEG II Systems decode support * [1996/01/11 16:12:35 Hans_Graves] * * Revision 1.1.2.4 1996/01/08 16:41:32 Hans_Graves * Added MPEG II decoding support * [1996/01/08 15:53:05 Hans_Graves] * * Revision 1.1.2.3 1995/11/09 23:14:06 Hans_Graves * Added MPEG audio decompression * [1995/11/09 23:08:41 Hans_Graves] * * Revision 1.1.2.2 1995/11/06 18:47:55 Hans_Graves * First time under SLIB * [1995/11/06 18:36:03 Hans_Graves] * * $EndLog$ *//*****************************************************************************
** Copyright (c) Digital Equipment Corporation, 1995 **** **** All Rights Reserved. Unpublished rights reserved under the copyright **** laws of the United States. **** **** The software contained on this media is proprietary to and embodies **** the confidential technology of Digital Equipment Corporation. **** Possession, use, duplication or dissemination of the software and **** media is authorized only pursuant to a valid written license from **** Digital Equipment Corporation. **** **** RESTRICTED RIGHTS LEGEND Use, duplication, or disclosure by the U.S. **** Government is subject to restrictions as set forth in Subparagraph **** (c)(1)(ii) of DFARS 252.227-7013, or in FAR 52.227-19, as applicable. ********************************************************************************//*
#define _SLIBDEBUG_
*/
#define SLIB_INTERNAL
#include "slib.h"
#include "mpeg.h"
#include "avi.h"
#ifdef AC3_SUPPORT
#include "ac3.h"
#endif /* AC3_SUPPORT */
#ifdef _SLIBDEBUG_
#define _DEBUG_ 1 /* detailed debuging statements */
#define _VERBOSE_ 1 /* show progress */
#define _VERIFY_ 1 /* verify correct operation */
#define _WARN_ 1 /* warnings about strange behavior */
#endif
#ifdef AC3_SUPPORT
SlibBoolean_t slibParseAC3Header(SlibInfo_t *Info, SlibPin_t *srcpin, unsigned char *buf, unsigned dword size, int *channels, int *sps, int *bps){ /*
* Initial cut at parameters - * Update later using header parsing - ***tfm*** */ Info->AudioBitRate = 256000; *channels = 2; *sps = 48000; *bps = 16; _SlibDebug(_VERBOSE_, printf("AC3: bitrate=%d channels=%d sps=%d bps=%s\n", Info->AudioBitRate, channels, sps, bps) ); return(TRUE);}#endif /* AC3_SUPPORT */
void SlibUpdateAudioInfo(SlibInfo_t *Info){ int channels=2, sps=44100, bps=16; SlibTime_t ptime=SLIB_TIME_NONE; _SlibDebug(_DEBUG_, printf("SlibUpdateAudioInfo()\n") );
if (SlibTypeIsVideoOnly(Info->Type)) /* no audio? */ return; if (Info->Mode == SLIB_MODE_COMPRESS) { switch (Info->Type) { case SLIB_TYPE_G723: //Initialize some info
sps = 8000; bps = 16; channels =1; break; default: break; } } else if (Info->Mode == SLIB_MODE_DECOMPRESS) { SlibPin_t *srcpin; unsigned char *buf; unsigned dword size;
switch (Info->Type) { case SLIB_TYPE_RIFF: /* might be WAVE format */ case SLIB_TYPE_PCM_WAVE: /* might be WAVE format */ srcpin=slibGetPin(Info, SLIB_DATA_COMPRESSED); buf = slibSearchBuffersOnPin(Info, srcpin, NULL, &size, RIFF_WAVE, 4, FALSE); if (buf) { Info->Type = SLIB_TYPE_PCM_WAVE; buf = slibSearchBuffersOnPin(Info, srcpin, NULL, &size, RIFF_FORMAT, 4, FALSE); if (buf) { dword datasize=((int)buf[3]<<24) | (int)buf[2]<<16 | (int)buf[1]<<8 | (int)buf[0]; WAVE_format fmt;
_SlibDebug(_DEBUG_, printf("datasize=%d\n", datasize); printf("%02X %02X %02X %02X\n", buf[0], buf[1], buf[2], buf[3]); printf("WAVE: SamplesPerSec=%d BitsPerSample=%d Channels=%d\n", sps, bps, channels) ); buf+=4; /* skip size */ memcpy(&fmt, buf, sizeof(fmt)); channels = fmt.nChannels; sps = fmt.nSamplesPerSec; if (datasize<sizeof(WAVE_format)) /* not PCM */ bps = 8; else bps = fmt.wBitsPerSample; if ((sps*channels*bps)>800) Info->AudioLength = (qword)(Info->FileSize*10L)/ (qword)((sps*channels*bps)/800); if ((srcpin=slibLoadPin(Info, SLIB_DATA_AUDIO))==NULL) return; Info->AudioType=SLIB_TYPE_PCM; } else return; /* couldn't find format */ } break;
#ifdef MPEG_SUPPORT
case SLIB_TYPE_MPEG1_AUDIO: case SLIB_TYPE_MPEG_SYSTEMS: case SLIB_TYPE_MPEG_SYSTEMS_MPEG2: case SLIB_TYPE_MPEG_TRANSPORT: case SLIB_TYPE_MPEG_PROGRAM: slibSetMaxInput(Info, 1000*1024); if ((srcpin=slibLoadPin(Info, SLIB_DATA_AUDIO))==NULL) { _SlibDebug(_DEBUG_ || _WARN_, printf("SlibUpdateAudioInfo() no audio data found\n") ); if ((srcpin=slibLoadPin(Info, SLIB_DATA_PRIVATE))==NULL) { Info->AudioStreams = 0; _SlibDebug(_DEBUG_ || _WARN_, printf("SlibUpdateAudioInfo() no private data found\n") ); slibSetMaxInput(Info, 0); /* no limit to input data */ return; } buf=slibGetBufferFromPin(Info, srcpin, &size, NULL); if (buf && size>=4) { _SlibDebug(_DEBUG_, printf("AC3 Audio Head: %02X %02X %02X %02X\n", buf[0], buf[1], buf[2], buf[3])); /* check for AC3 sync code, may be reverse ordered */ if ((buf[0]==0x0B && buf[1]==0x77) || (buf[2]==0x0B && buf[3]==0x77) || (buf[0]==0x77 && buf[1]==0x0B) || (buf[2]==0x77 && buf[3]==0x0B)) { Info->AudioType=SLIB_TYPE_AC3_AUDIO; _SlibDebug(_DEBUG_, printf("AC3 Audio Sync Word found\n") ); } } }
if (Info->AudioType==SLIB_TYPE_UNKNOWN || Info->AudioType==SLIB_TYPE_MPEG1_AUDIO) { /* search for MPEG audio sync word */ buf = NULL; slibSetMaxInput(Info, 10*1024); /* don't search too much */ do { buf = slibSearchBuffersOnPin(Info, srcpin, buf, &size, 0xFF, 1, FALSE); } while (buf && (*buf&0xF0) != 0xF0); slibSetMaxInput(Info, 0); /* no limit to input data */ if (buf) { const char *mode_names[4] = { "stereo", "j-stereo", "dual-ch", "single-ch" }; const char *layer_names[4] = { "?", "I", "II", "III" }; const int mpeg_freq[4] = {44100, 48000, 32000, 0}; const int bitrate[4][15] = { {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448}, {0,32,48,56,64,80,96,112,128,160,192,224,256,320,384}, {0,32,40,48,56,64,80,96,112,128,160,192,224,256,320} }; int bitrate_index, layer, mode, freq_index; _SlibDebug(_DEBUG_, printf("MPEG Audio Head: %02X %02X %02X %02X\n", buf[0], buf[1], buf[2], buf[3])); if ((*buf & 0xF0)==0xF0) { layer = 4-((*buf>>1) & 0x03); buf++; size--; bitrate_index = *buf >> 4; freq_index = (*buf>>2) & 0x03; buf++; size--; mode = *buf >> 6;
Info->AudioBitRate = bitrate[layer][bitrate_index]*1000; channels = mode==3 ? 1 : 2; sps = mpeg_freq[freq_index]; bps = 16; if (Info->AudioBitRate>100) Info->AudioLength = (qword)(Info->FileSize*80L)/ (qword)(Info->AudioBitRate/100); _SlibDebug(_VERBOSE_, printf("layer=%d bitrate=%d(%d) mode=%s freq(%d)=%d\n", layer, bitrate[layer][bitrate_index], bitrate_index, mode_names[mode], freq_index, mpeg_freq[freq_index]) ); if (layer<=2 && Info->AudioBitRate>0 && Info->AudioBitRate<10000000) /* valid header */ Info->AudioType=SLIB_TYPE_MPEG1_AUDIO; else Info->AudioBitRate=0; } } } if (Info->AudioType==SLIB_TYPE_UNKNOWN || Info->AudioType==SLIB_TYPE_AC3_AUDIO) {#ifdef AC3_SUPPORT
_SlibDebug(_VERBOSE_, printf("Searching for AC-3 on %s\n", srcpin->name) ); /* Search for AC-3 sync word */ slibSetMaxInput(Info, 1000*1024); buf = slibSearchBuffersOnPin(Info, srcpin, NULL, &size, AC3_SYNC_WORD_REV, AC3_SYNC_WORD_LEN/8, FALSE); slibSetMaxInput(Info, 0); /* no limit to input data */ if (buf) /* found sync word */ { Info->AudioType=SLIB_TYPE_AC3_AUDIO; _SlibDebug(_VERBOSE_, printf("AC3\n")); slibParseAC3Header(Info, srcpin, buf, size, &channels, &sps, &bps); if (srcpin->ID==SLIB_DATA_PRIVATE) { /* the private data pin now become the audio pin */ slibRenamePin(Info, SLIB_DATA_PRIVATE, SLIB_DATA_AUDIO, "Audio"); /* audio will be pulled from PRIVATE packets */ Info->AudioMainStream=MPEG_PRIVATE_STREAM1_BASE; } } else { slibRemovePin(Info, SLIB_DATA_AUDIO); return; }#else /* !AC3_SUPPORT */
slibRemovePin(Info, SLIB_DATA_AUDIO); return;#endif /* !AC3_SUPPORT */
} break;#endif /* MPEG_SUPPORT */
#ifdef AC3_SUPPORT
case SLIB_TYPE_AC3_AUDIO: slibSetMaxInput(Info, 1000*1024); if ((srcpin=slibLoadPin(Info, SLIB_DATA_AUDIO))==NULL) { Info->AudioStreams = 0; _SlibDebug(_DEBUG_ || _WARN_, printf("SlibUpdateAudioInfo() no audio data found\n") ); slibSetMaxInput(Info, 0); return; }
/* buf = slibGetBufferFromPin(Info, srcpin, &size, NULL); */ /* Search for AC-3 sync word */ buf = slibSearchBuffersOnPin(Info, srcpin, NULL, &size, AC3_SYNC_WORD_REV, AC3_SYNC_WORD_LEN/8, FALSE); slibSetMaxInput(Info, 0); if (buf) { slibParseAC3Header(Info, srcpin, buf, size, &channels, &sps, &bps); if (Info->AudioBitRate>100) Info->AudioLength = (qword)(Info->FileSize*80L)/ (qword)(Info->AudioBitRate/100); } else { slibRemovePin(Info, SLIB_DATA_AUDIO); return; } Info->AudioType=SLIB_TYPE_AC3_AUDIO; break;#endif /* AC3_SUPPORT */
#ifdef G723_SUPPORT
case SLIB_TYPE_G723: slibSetMaxInput(Info, 1000*1024); if ((srcpin=slibLoadPin(Info, SLIB_DATA_AUDIO))==NULL) { Info->AudioStreams = 0; _SlibDebug(_DEBUG_ || _WARN_, printf("SlibUpdateAudioInfo() no audio data found\n") ); slibSetMaxInput(Info, 0); return; } slibSetMaxInput(Info, 0); buf = slibPeekBufferOnPin(Info, srcpin, &size, NULL); if (buf) { /* we need to parse the G.723 frame header to
* get the actual bitrate */ if(buf[0] & 0x1) /* read the rate bit in the G.723 frame header */ Info->AudioBitRate=5333; else Info->AudioBitRate=6400; if (Info->AudioBitRate>0) Info->AudioLength = (qword)(Info->FileSize*80L)/ (qword)(Info->AudioBitRate/100); } else { slibRemovePin(Info, SLIB_DATA_AUDIO); return; } //Initialize some info
sps = 8000; bps = 16; channels =1; Info->AudioType=SLIB_TYPE_G723; break;#endif /*G723_SUPPORT*/
default: return; } } Info->AudioStreams = 1; if (SlibTypeHasTimeStamps(Info->Type)) { ptime=slibGetNextTimeOnPin(Info, slibGetPin(Info, SLIB_DATA_AUDIO), 100*1024); if (SlibTimeIsValid(ptime)) Info->AudioPTimeBase=ptime; } /* round sample rate to nearest valid rate */ if (sps<=8000) sps=8000; else if (sps<=11025) sps=11025; else if (sps<=22050) sps=22050; else if (sps<=32000) sps=32000; else if (sps<=44100) sps=44100; Info->SamplesPerSec = sps; Info->BitsPerSample = bps; Info->Channels = channels; if (Info->CompAudioFormat==NULL) Info->CompAudioFormat=(WAVEFORMATEX *)ScAlloc(sizeof(WAVEFORMATEX)); if (Info->CompAudioFormat!=NULL) { Info->CompAudioFormat->wFormatTag = WAVE_FORMAT_PCM; Info->CompAudioFormat->nChannels = (WORD)channels; Info->CompAudioFormat->wBitsPerSample = (WORD)bps; Info->CompAudioFormat->nSamplesPerSec = sps; Info->CompAudioFormat->nBlockAlign = bps>>3 * channels; Info->CompAudioFormat->nAvgBytesPerSec = Info->CompAudioFormat->nBlockAlign * sps; } if (Info->AudioFormat==NULL) Info->AudioFormat=(WAVEFORMATEX *)ScAlloc(sizeof(WAVEFORMATEX)); if (Info->AudioFormat!=NULL) { Info->AudioFormat->wFormatTag = WAVE_FORMAT_PCM; Info->AudioFormat->nChannels = (WORD)channels; Info->AudioFormat->wBitsPerSample = (WORD)bps; Info->AudioFormat->nSamplesPerSec = sps; Info->AudioFormat->nBlockAlign = (bps>>3) * channels; Info->AudioFormat->nAvgBytesPerSec = Info->AudioFormat->nBlockAlign * sps; }}
SlibTime_t slibSkipAudio(SlibInfo_t *Info, SlibStream_t stream, SlibTime_t timems){ dword timeskipped=0, samples=0, frames=0; SlibPin_t *srcpin; if (Info->AudioStreams<=0) return(0); srcpin=slibLoadPin(Info, SLIB_DATA_AUDIO); if (!srcpin) return(0); _SlibDebug(_VERBOSE_, printf("slibSkipAudio(stream=%d, %d ms)\n", stream,timems) ); switch (Info->AudioType) {#ifdef MPEG_SUPPORT
case SLIB_TYPE_MPEG1_AUDIO: { unsigned char *buf, *bufstart; unsigned dword size, sps, channels, layer; static const int layer_samples[4] = {384, 384, 1152, 1152}; static const int mpeg_freq[4] = {44100, 48000, 32000, 0}; while (timeskipped<timems) { do { bufstart=buf=slibSearchBuffersOnPin(Info, srcpin, NULL, &size, 0xFF, 1, TRUE); _SlibDebug(_WARN_ && size==0, printf("SkipAudio() size=0\n")); if (!bufstart) return(timeskipped); if ((buf[0]&0xF0)==0xF0 && buf[0]!=0xFF) break; else slibInsertBufferOnPin(srcpin, buf, size, SLIB_TIME_NONE); } while (1); frames++; layer = 4-((*buf>>1) & 0x03); buf++; size--; if (!size) { SlibFreeBuffer(bufstart); bufstart=buf=slibGetBufferFromPin(Info, srcpin, &size, NULL); if (!bufstart) return(timeskipped); } sps = mpeg_freq[(*buf>>2) & 0x03]; buf++; size--; if (!size) { SlibFreeBuffer(bufstart); bufstart=buf=slibGetBufferFromPin(Info, srcpin, &size, NULL); if (!bufstart) return(timeskipped); } channels = (*buf >> 6)==3 ? 1 : 2; buf++; size--; samples+=layer_samples[layer]; if (sps) timeskipped=(1000*samples)/sps; _SlibDebug(_DEBUG_, printf("samples=%d timeskipped=%d\n", samples, timeskipped)); if (size) { SlibAllocSubBuffer(buf, size); slibInsertBufferOnPin(srcpin, buf, size, SLIB_TIME_NONE); } SlibFreeBuffer(bufstart); } } break;#endif /* MPEG_SUPPORT */
#ifdef AC3_SUPPORT
case SLIB_TYPE_AC3_AUDIO: /* For better audio/video synchronization - add Dolby AC-3 support here */ break;#endif /* AC3_SUPPORT */
default: break; } _SlibDebug(_VERBOSE_, printf("slibSkipAudio() frames=%d samples=%d timeskipped=%d ms\n", frames, samples, timeskipped)); return(timeskipped);}
SlibStatus_t slibValidateAudioParams(SlibInfo_t *Info){ return(SlibErrorNone);}
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