Mercurial > SDL_sound_CoreAudio
view decoders/flac.c @ 562:7e08477b0fc1
MP3 decoder upgrade work.
Ripped out SMPEG and mpglib support, replaced it with "mpg123.c" and libmpg123.
libmpg123 is a much better version of mpglib, so it should solve all the
problems about MP3's not seeking, or most modern MP3's not playing at all,
etc. Since you no longer have to make a tradeoff with SMPEG for features, and
SMPEG is basically rotting, I removed it from the project.
There is still work to be done with libmpg123...there are MMX, 3DNow, SSE,
Altivec, etc decoders which we don't have enabled at the moment, and the
build system could use some work to make this compile more cleanly, etc.
Still: huge win.
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Fri, 30 Jan 2009 02:44:47 -0500 |
parents | 2e8907ff98e9 |
children |
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/* * SDL_sound -- An abstract sound format decoding API. * Copyright (C) 2001 Ryan C. Gordon. * * 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 2.1 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* * FLAC decoder for SDL_sound. * * This driver handles FLAC audio, that is to say the Free Lossless Audio * Codec. It depends on libFLAC for decoding, which can be grabbed from: * http://flac.sourceforge.net * * Please see the file LICENSE.txt in the source's root directory. * * This file written by Torbjörn Andersson. (d91tan@Update.UU.SE) */ #if HAVE_CONFIG_H # include <config.h> #endif #ifdef SOUND_SUPPORTS_FLAC #include <stdio.h> #include <stdlib.h> #include <string.h> #include "SDL_sound.h" #define __SDL_SOUND_INTERNAL__ #include "SDL_sound_internal.h" #include <FLAC/export.h> /* FLAC 1.1.3 has FLAC_API_VERSION_CURRENT == 8 */ #if !defined(FLAC_API_VERSION_CURRENT) || FLAC_API_VERSION_CURRENT < 8 #define LEGACY_FLAC #else #undef LEGACY_FLAC #endif #ifdef LEGACY_FLAC #include <FLAC/seekable_stream_decoder.h> #define D_END_OF_STREAM FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM #define d_new() FLAC__seekable_stream_decoder_new() #define d_init(x) FLAC__seekable_stream_decoder_init(x) #define d_process_metadata(x) FLAC__seekable_stream_decoder_process_until_end_of_metadata(x) #define d_process_one_frame(x) FLAC__seekable_stream_decoder_process_single(x) #define d_get_state(x) FLAC__seekable_stream_decoder_get_state(x) #define d_finish(x) FLAC__seekable_stream_decoder_finish(x) #define d_delete(x) FLAC__seekable_stream_decoder_delete(x) #define d_set_read_callback(x, y) FLAC__seekable_stream_decoder_set_read_callback(x, y) #define d_set_write_callback(x, y) FLAC__seekable_stream_decoder_set_write_callback(x, y) #define d_set_metadata_callback(x, y) FLAC__seekable_stream_decoder_set_metadata_callback(x, y) #define d_set_error_callback(x, y) FLAC__seekable_stream_decoder_set_error_callback(x, y) #define d_set_client_data(x, y) FLAC__seekable_stream_decoder_set_client_data(x, y) typedef FLAC__SeekableStreamDecoder decoder_t; typedef FLAC__SeekableStreamDecoderReadStatus d_read_status_t; #define D_SEEK_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK #define D_SEEK_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR #define D_TELL_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK #define D_TELL_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_ERROR #define D_LENGTH_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK #define D_LENGTH_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_ERROR #define d_set_seek_callback(x, y) FLAC__seekable_stream_decoder_set_seek_callback(x, y) #define d_set_tell_callback(x, y) FLAC__seekable_stream_decoder_set_tell_callback(x, y) #define d_set_length_callback(x, y) FLAC__seekable_stream_decoder_set_length_callback(x, y) #define d_set_eof_callback(x, y) FLAC__seekable_stream_decoder_set_eof_callback(x, y) #define d_seek_absolute(x, y) FLAC__seekable_stream_decoder_seek_absolute(x, y) typedef FLAC__SeekableStreamDecoderSeekStatus d_seek_status_t; typedef FLAC__SeekableStreamDecoderTellStatus d_tell_status_t; typedef FLAC__SeekableStreamDecoderLengthStatus d_length_status_t; #else #include <FLAC/stream_decoder.h> #define D_END_OF_STREAM FLAC__STREAM_DECODER_END_OF_STREAM #define d_new() FLAC__stream_decoder_new() #define d_process_metadata(x) FLAC__stream_decoder_process_until_end_of_metadata(x) #define d_process_one_frame(x) FLAC__stream_decoder_process_single(x) #define d_get_state(x) FLAC__stream_decoder_get_state(x) #define d_finish(x) FLAC__stream_decoder_finish(x) #define d_delete(x) FLAC__stream_decoder_delete(x) typedef FLAC__StreamDecoder decoder_t; typedef FLAC__StreamDecoderReadStatus d_read_status_t; #define D_SEEK_STATUS_OK FLAC__STREAM_DECODER_SEEK_STATUS_OK #define D_SEEK_STATUS_ERROR FLAC__STREAM_DECODER_SEEK_STATUS_ERROR #define D_TELL_STATUS_OK FLAC__STREAM_DECODER_TELL_STATUS_OK #define D_TELL_STATUS_ERROR FLAC__STREAM_DECODER_TELL_STATUS_ERROR #define D_LENGTH_STATUS_OK FLAC__STREAM_DECODER_LENGTH_STATUS_OK #define D_LENGTH_STATUS_ERROR FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR #define d_seek_absolute(x, y) FLAC__stream_decoder_seek_absolute(x, y) typedef FLAC__StreamDecoderSeekStatus d_seek_status_t; typedef FLAC__StreamDecoderTellStatus d_tell_status_t; typedef FLAC__StreamDecoderLengthStatus d_length_status_t; #endif #define D_WRITE_CONTINUE FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE #define D_READ_END_OF_STREAM FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM #define D_READ_ABORT FLAC__STREAM_DECODER_READ_STATUS_ABORT #define D_READ_CONTINUE FLAC__STREAM_DECODER_READ_STATUS_CONTINUE #define d_error_status_string FLAC__StreamDecoderErrorStatusString typedef FLAC__StreamDecoderErrorStatus d_error_status_t; typedef FLAC__StreamMetadata d_metadata_t; typedef FLAC__StreamDecoderWriteStatus d_write_status_t; static int FLAC_init(void); static void FLAC_quit(void); static int FLAC_open(Sound_Sample *sample, const char *ext); static void FLAC_close(Sound_Sample *sample); static Uint32 FLAC_read(Sound_Sample *sample); static int FLAC_rewind(Sound_Sample *sample); static int FLAC_seek(Sound_Sample *sample, Uint32 ms); static const char *extensions_flac[] = { "FLAC", "FLA", NULL }; const Sound_DecoderFunctions __Sound_DecoderFunctions_FLAC = { { extensions_flac, "Free Lossless Audio Codec", "Torbjörn Andersson <d91tan@Update.UU.SE>", "http://flac.sourceforge.net/" }, FLAC_init, /* init() method */ FLAC_quit, /* quit() method */ FLAC_open, /* open() method */ FLAC_close, /* close() method */ FLAC_read, /* read() method */ FLAC_rewind, /* rewind() method */ FLAC_seek /* seek() method */ }; /* This is what we store in our internal->decoder_private field. */ typedef struct { decoder_t *decoder; SDL_RWops *rw; Sound_Sample *sample; Uint32 frame_size; Uint8 is_flac; Uint32 stream_length; } flac_t; static void free_flac(flac_t *f) { d_finish(f->decoder); d_delete(f->decoder); free(f); } /* free_flac */ #ifdef LEGACY_FLAC static d_read_status_t read_callback( const decoder_t *decoder, FLAC__byte buffer[], unsigned int *bytes, void *client_data) #else static d_read_status_t read_callback( const decoder_t *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data) #endif { flac_t *f = (flac_t *) client_data; Uint32 retval; retval = SDL_RWread(f->rw, (Uint8 *) buffer, 1, *bytes); if (retval == 0) { *bytes = 0; f->sample->flags |= SOUND_SAMPLEFLAG_EOF; return(D_READ_END_OF_STREAM); } /* if */ if (retval == -1) { *bytes = 0; f->sample->flags |= SOUND_SAMPLEFLAG_ERROR; return(D_READ_ABORT); } /* if */ if (retval < *bytes) { *bytes = retval; f->sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; } /* if */ return(D_READ_CONTINUE); } /* read_callback */ static d_write_status_t write_callback( const decoder_t *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data) { flac_t *f = (flac_t *) client_data; Uint32 i, j; Uint32 sample; Uint8 *dst; f->frame_size = frame->header.channels * frame->header.blocksize * frame->header.bits_per_sample / 8; if (f->frame_size > f->sample->buffer_size) Sound_SetBufferSize(f->sample, f->frame_size); dst = f->sample->buffer; /* If the sample is neither exactly 8-bit nor 16-bit, it will have to * be converted. Unfortunately the buffer is read-only, so we either * have to check for each sample, or make a copy of the buffer. I'm * not sure which way is best, so I've arbitrarily picked the former. */ if (f->sample->actual.format == AUDIO_S8) { for (i = 0; i < frame->header.blocksize; i++) for (j = 0; j < frame->header.channels; j++) { sample = buffer[j][i]; if (frame->header.bits_per_sample < 8) sample <<= (8 - frame->header.bits_per_sample); *dst++ = sample & 0x00ff; } /* for */ } /* if */ else { for (i = 0; i < frame->header.blocksize; i++) for (j = 0; j < frame->header.channels; j++) { sample = buffer[j][i]; if (frame->header.bits_per_sample < 16) sample <<= (16 - frame->header.bits_per_sample); else if (frame->header.bits_per_sample > 16) sample >>= (frame->header.bits_per_sample - 16); *dst++ = (sample & 0xff00) >> 8; *dst++ = sample & 0x00ff; } /* for */ } /* else */ return(D_WRITE_CONTINUE); } /* write_callback */ static void metadata_callback( const decoder_t *decoder, const d_metadata_t *metadata, void *client_data) { flac_t *f = (flac_t *) client_data; Sound_Sample *sample = f->sample; Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; SNDDBG(("FLAC: Metadata callback.\n")); /* There are several kinds of metadata, but STREAMINFO is the only * one that always has to be there. */ if (metadata->type == FLAC__METADATA_TYPE_STREAMINFO) { SNDDBG(("FLAC: Metadata is streaminfo.\n")); f->is_flac = 1; sample->actual.channels = metadata->data.stream_info.channels; sample->actual.rate = metadata->data.stream_info.sample_rate; if (metadata->data.stream_info.sample_rate == 0 || metadata->data.stream_info.total_samples == 0) { internal->total_time = -1; } /* if */ else { internal->total_time = (metadata->data.stream_info.total_samples) / metadata->data.stream_info.sample_rate * 1000; internal->total_time += (metadata->data.stream_info.total_samples % metadata->data.stream_info.sample_rate) * 1000 / metadata->data.stream_info.sample_rate; } /* else */ if (metadata->data.stream_info.bits_per_sample > 8) sample->actual.format = AUDIO_S16MSB; else sample->actual.format = AUDIO_S8; } /* if */ } /* metadata_callback */ static void error_callback( const decoder_t *decoder, d_error_status_t status, void *client_data) { flac_t *f = (flac_t *) client_data; __Sound_SetError(d_error_status_string[status]); f->sample->flags |= SOUND_SAMPLEFLAG_ERROR; } /* error_callback */ static d_seek_status_t seek_callback( const decoder_t *decoder, FLAC__uint64 absolute_byte_offset, void *client_data) { flac_t *f = (flac_t *) client_data; if (SDL_RWseek(f->rw, absolute_byte_offset, SEEK_SET) >= 0) { return(D_SEEK_STATUS_OK); } /* if */ return(D_SEEK_STATUS_ERROR); } /* seek_callback*/ static d_tell_status_t tell_callback( const decoder_t *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data) { flac_t *f = (flac_t *) client_data; int pos; pos = SDL_RWtell(f->rw); if (pos < 0) { return(D_TELL_STATUS_ERROR); } /* if */ *absolute_byte_offset = pos; return(D_TELL_STATUS_OK); } /* tell_callback */ static d_length_status_t length_callback( const decoder_t *decoder, FLAC__uint64 *stream_length, void *client_data) { flac_t *f = (flac_t *) client_data; if (f->sample->flags & SOUND_SAMPLEFLAG_CANSEEK) { *stream_length = f->stream_length; return(D_LENGTH_STATUS_OK); } /* if */ return(D_LENGTH_STATUS_ERROR); } /* length_callback */ static FLAC__bool eof_callback( const decoder_t *decoder, void *client_data) { flac_t *f = (flac_t *) client_data; int pos; /* Maybe we could check for SOUND_SAMPLEFLAG_EOF here instead? */ pos = SDL_RWtell(f->rw); if (pos >= 0 && pos >= f->stream_length) { return(true); } /* if */ return(false); } /* eof_callback */ static int FLAC_init(void) { return(1); /* always succeeds. */ } /* FLAC_init */ static void FLAC_quit(void) { /* it's a no-op. */ } /* FLAC_quit */ #define FLAC_MAGIC 0x43614C66 /* "fLaC" in ASCII. */ static int FLAC_open(Sound_Sample *sample, const char *ext) { Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; SDL_RWops *rw = internal->rw; decoder_t *decoder; flac_t *f; int i; int has_extension = 0; Uint32 pos; /* * If the extension is "flac", we'll believe that this is really meant * to be a FLAC stream, and will try to grok it from existing metadata. * metadata searching can be a very expensive operation, however, so * unless the user swears that it is a FLAC stream through the extension, * we decide what to do based on the existance of a 32-bit magic number. */ for (i = 0; extensions_flac[i] != NULL; i++) { if (__Sound_strcasecmp(ext, extensions_flac[i]) == 0) { has_extension = 1; break; } /* if */ } /* for */ if (!has_extension) { int rc; Uint32 flac_magic = SDL_ReadLE32(rw); BAIL_IF_MACRO(flac_magic != FLAC_MAGIC, "FLAC: Not a FLAC stream.", 0); /* move back over magic number for metadata scan... */ rc = SDL_RWseek(internal->rw, -sizeof (flac_magic), SEEK_CUR); BAIL_IF_MACRO(rc < 0, ERR_IO_ERROR, 0); } /* if */ f = (flac_t *) malloc(sizeof (flac_t)); BAIL_IF_MACRO(f == NULL, ERR_OUT_OF_MEMORY, 0); decoder = d_new(); if (decoder == NULL) { free(f); BAIL_MACRO(ERR_OUT_OF_MEMORY, 0); } /* if */ #ifdef LEGACY_FLAC d_set_read_callback(decoder, read_callback); d_set_write_callback(decoder, write_callback); d_set_metadata_callback(decoder, metadata_callback); d_set_error_callback(decoder, error_callback); d_set_seek_callback(decoder, seek_callback); d_set_tell_callback(decoder, tell_callback); d_set_length_callback(decoder, length_callback); d_set_eof_callback(decoder, eof_callback); d_set_client_data(decoder, f); #endif f->rw = internal->rw; f->sample = sample; f->decoder = decoder; f->sample->actual.format = 0; f->is_flac = 0 /* !!! FIXME: should be "has_extension", not "0". */; internal->decoder_private = f; /* really should check the init return value here: */ #ifdef LEGACY_FLAC d_init(decoder); #else FLAC__stream_decoder_init_stream(decoder, read_callback, seek_callback, tell_callback, length_callback, eof_callback, write_callback, metadata_callback, error_callback, f); #endif sample->flags = SOUND_SAMPLEFLAG_NONE; pos = SDL_RWtell(f->rw); if (SDL_RWseek(f->rw, 0, SEEK_END) > 0) { f->stream_length = SDL_RWtell(f->rw); if (SDL_RWseek(f->rw, pos, SEEK_SET) == -1) { free_flac(f); BAIL_MACRO(ERR_IO_ERROR, 0); } /* if */ sample->flags = SOUND_SAMPLEFLAG_CANSEEK; } /* if */ /* * If we are not sure this is a FLAC stream, check for the STREAMINFO * metadata block. If not, we'd have to peek at the first audio frame * and get the sound format from there, but that is not yet * implemented. */ if (!f->is_flac) { d_process_metadata(decoder); /* Still not FLAC? Give up. */ if (!f->is_flac) { free_flac(f); BAIL_MACRO("FLAC: No metadata found. Not a FLAC stream?", 0); } /* if */ } /* if */ SNDDBG(("FLAC: Accepting data stream.\n")); return(1); } /* FLAC_open */ static void FLAC_close(Sound_Sample *sample) { Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; flac_t *f = (flac_t *) internal->decoder_private; free_flac(f); } /* FLAC_close */ static Uint32 FLAC_read(Sound_Sample *sample) { Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; flac_t *f = (flac_t *) internal->decoder_private; Uint32 len; if (!d_process_one_frame(f->decoder)) { sample->flags |= SOUND_SAMPLEFLAG_ERROR; BAIL_MACRO("FLAC: Couldn't decode frame.", 0); } /* if */ if (d_get_state(f->decoder) == D_END_OF_STREAM) { sample->flags |= SOUND_SAMPLEFLAG_EOF; return(0); } /* if */ /* An error may have been signalled through the error callback. */ if (sample->flags & SOUND_SAMPLEFLAG_ERROR) return(0); return(f->frame_size); } /* FLAC_read */ static int FLAC_rewind(Sound_Sample *sample) { return FLAC_seek(sample, 0); } /* FLAC_rewind */ static int FLAC_seek(Sound_Sample *sample, Uint32 ms) { Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; flac_t *f = (flac_t *) internal->decoder_private; d_seek_absolute(f->decoder, (ms * sample->actual.rate) / 1000); return(1); } /* FLAC_seek */ #endif /* SOUND_SUPPORTS_FLAC */ /* end of flac.c ... */