music_flac.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 17 Apr 2013 01:27:39 -0700
changeset 611 595186c9c0ec
parent 601 05123263dab3
child 613 6fa075aa693e
permissions -rw-r--r--
Build music support into the framework
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/*
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  SDL_mixer:  An audio mixer library based on the SDL library
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  Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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  This file is used to support SDL_LoadMUS playback of FLAC files.
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  	~ Austen Dicken (admin@cvpcs.org)
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*/
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#ifdef FLAC_MUSIC
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "SDL_mixer.h"
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#include "dynamic_flac.h"
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#include "music_flac.h"
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/* This is the format of the audio mixer data */
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static SDL_AudioSpec mixer;
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/* Initialize the FLAC player, with the given mixer settings
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   This function returns 0, or -1 if there was an error.
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 */
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int FLAC_init(SDL_AudioSpec *mixerfmt)
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{
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	mixer = *mixerfmt;
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	return(0);
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}
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/* Set the volume for an FLAC stream */
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void FLAC_setvolume(FLAC_music *music, int volume)
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{
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	music->volume = volume;
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}
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static FLAC__StreamDecoderReadStatus flac_read_music_cb(
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									const FLAC__StreamDecoder *decoder,
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									FLAC__byte buffer[],
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									size_t *bytes,
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									void *client_data)
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{
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	FLAC_music *data = (FLAC_music*)client_data;
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	// make sure there is something to be reading
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	if (*bytes > 0) {
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		*bytes = SDL_RWread (data->rwops, buffer, sizeof (FLAC__byte), *bytes);
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		if (*bytes < 0) { // error in read
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			return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
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		}
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		else if (*bytes == 0 ) { // no data was read (EOF)
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			return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
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		}
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		else { // data was read, continue
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			return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
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		}
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	}
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	else {
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		return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
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	}
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}
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static FLAC__StreamDecoderSeekStatus flac_seek_music_cb(
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									const FLAC__StreamDecoder *decoder,
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									FLAC__uint64 absolute_byte_offset,
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									void *client_data)
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{
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	FLAC_music *data = (FLAC_music*)client_data;
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	if (SDL_RWseek (data->rwops, absolute_byte_offset, RW_SEEK_SET) < 0) {
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		return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
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	}
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	else {
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		return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
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	}
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}
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static FLAC__StreamDecoderTellStatus flac_tell_music_cb(
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									const FLAC__StreamDecoder *decoder,
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									FLAC__uint64 *absolute_byte_offset,
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									void *client_data )
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{
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	FLAC_music *data = (FLAC_music*)client_data;
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	int pos = SDL_RWtell (data->rwops);
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	if (pos < 0) {
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		return FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
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	}
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	else {
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		*absolute_byte_offset = (FLAC__uint64)pos;
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		return FLAC__STREAM_DECODER_TELL_STATUS_OK;
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	}
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}
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static FLAC__StreamDecoderLengthStatus flac_length_music_cb (
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									const FLAC__StreamDecoder *decoder,
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									FLAC__uint64 *stream_length,
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									void *client_data)
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{
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	FLAC_music *data = (FLAC_music*)client_data;
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	int pos = SDL_RWtell (data->rwops);
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	int length = SDL_RWseek (data->rwops, 0, RW_SEEK_END);
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	if (SDL_RWseek (data->rwops, pos, RW_SEEK_SET) != pos || length < 0) {
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		/* there was an error attempting to return the stream to the original
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		 * position, or the length was invalid. */
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		return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR;
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	}
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	else {
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		*stream_length = (FLAC__uint64)length;
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		return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
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	}
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}
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static FLAC__bool flac_eof_music_cb(
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								const FLAC__StreamDecoder *decoder,
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								void *client_data )
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{
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	FLAC_music *data = (FLAC_music*)client_data;
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	int pos = SDL_RWtell (data->rwops);
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	int end = SDL_RWseek (data->rwops, 0, RW_SEEK_END);
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	// was the original position equal to the end (a.k.a. the seek didn't move)?
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	if (pos == end) {
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		// must be EOF
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		return true;
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	}
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	else {
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		// not EOF, return to the original position
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		SDL_RWseek (data->rwops, pos, RW_SEEK_SET);
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		return false;
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	}
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}
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static FLAC__StreamDecoderWriteStatus flac_write_music_cb(
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									const FLAC__StreamDecoder *decoder,
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									const FLAC__Frame *frame,
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									const FLAC__int32 *const buffer[],
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									void *client_data)
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{
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	FLAC_music *data = (FLAC_music *)client_data;
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	size_t i;
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	if (data->flac_data.total_samples == 0) {
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		SDL_SetError ("Given FLAC file does not specify its sample count.");
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		return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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	}
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	if (data->flac_data.channels != 2 ||
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		data->flac_data.bits_per_sample != 16) {
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		SDL_SetError("Current FLAC support is only for 16 bit Stereo files.");
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		return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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	}
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	for (i = 0; i < frame->header.blocksize; i++) {
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		FLAC__int16 i16;
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		FLAC__uint16 ui16;
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		// make sure we still have at least two bytes that can be read (one for
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		// each channel)
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		if (data->flac_data.max_to_read >= 4) {
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			// does the data block exist?
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			if (!data->flac_data.data) {
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				data->flac_data.data_len = data->flac_data.max_to_read;
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				data->flac_data.data_read = 0;
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				// create it
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				data->flac_data.data =
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					(char *)SDL_malloc (data->flac_data.data_len);
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				if (!data->flac_data.data) {
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					return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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				}
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			}
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			i16 = (FLAC__int16)buffer[0][i];
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			ui16 = (FLAC__uint16)i16;
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			*((data->flac_data.data) + (data->flac_data.data_read++)) =
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															(char)(ui16);
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			*((data->flac_data.data) + (data->flac_data.data_read++)) =
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															(char)(ui16 >> 8);
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			i16 = (FLAC__int16)buffer[1][i];
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			ui16 = (FLAC__uint16)i16;
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			*((data->flac_data.data) + (data->flac_data.data_read++)) =
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															(char)(ui16);
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			*((data->flac_data.data) + (data->flac_data.data_read++)) =
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															(char)(ui16 >> 8);
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			data->flac_data.max_to_read -= 4;
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			if (data->flac_data.max_to_read < 4) {
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				// we need to set this so that the read halts from the
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				// FLAC_getsome function.
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				data->flac_data.max_to_read = 0;
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			}
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		}
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		else {
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			// we need to write to the overflow
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			if (!data->flac_data.overflow) {
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				data->flac_data.overflow_len =
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											4 * (frame->header.blocksize - i);
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				data->flac_data.overflow_read = 0;
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				// make it big enough for the rest of the block
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				data->flac_data.overflow =
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					(char *)SDL_malloc (data->flac_data.overflow_len);
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				if (!data->flac_data.overflow) {
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					return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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				}
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			}
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			i16 = (FLAC__int16)buffer[0][i];
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			ui16 = (FLAC__uint16)i16;
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			*((data->flac_data.overflow) + (data->flac_data.overflow_read++)) =
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															(char)(ui16);
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			*((data->flac_data.overflow) + (data->flac_data.overflow_read++)) =
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															(char)(ui16 >> 8);
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			i16 = (FLAC__int16)buffer[1][i];
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			ui16 = (FLAC__uint16)i16;
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			*((data->flac_data.overflow) + (data->flac_data.overflow_read++)) =
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															(char)(ui16);
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			*((data->flac_data.overflow) + (data->flac_data.overflow_read++)) =
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															(char)(ui16 >> 8);
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		}
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	}
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	return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
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}
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static void flac_metadata_music_cb(
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					const FLAC__StreamDecoder *decoder,
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					const FLAC__StreamMetadata *metadata,
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					void *client_data)
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{
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	FLAC_music *data = (FLAC_music *)client_data;
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	if (metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
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		data->flac_data.sample_rate = metadata->data.stream_info.sample_rate;
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		data->flac_data.channels = metadata->data.stream_info.channels;
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		data->flac_data.total_samples =
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							metadata->data.stream_info.total_samples;
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		data->flac_data.bits_per_sample =
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							metadata->data.stream_info.bits_per_sample;
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		data->flac_data.sample_size = data->flac_data.channels *
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										((data->flac_data.bits_per_sample) / 8);
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	}
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}
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static void flac_error_music_cb(
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				const FLAC__StreamDecoder *decoder,
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				FLAC__StreamDecoderErrorStatus status,
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				void *client_data)
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{
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	// print an SDL error based on the error status
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	switch (status) {
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		case FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC:
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			SDL_SetError ("Error processing the FLAC file [LOST_SYNC].");
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		break;
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		case FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER:
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			SDL_SetError ("Error processing the FLAC file [BAD_HEADER].");
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		break;
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		case FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH:
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			SDL_SetError ("Error processing the FLAC file [CRC_MISMATCH].");
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		break;
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		case FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM:
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			SDL_SetError ("Error processing the FLAC file [UNPARSEABLE].");
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		break;
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		default:
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			SDL_SetError ("Error processing the FLAC file [UNKNOWN].");
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		break;
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	}
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}
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/* Load an FLAC stream from an SDL_RWops object */
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FLAC_music *FLAC_new_RW(SDL_RWops *rw, int freerw)
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{
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	FLAC_music *music;
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	int init_stage = 0;
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	int was_error = 1;
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	if (!Mix_Init(MIX_INIT_FLAC)) {
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		if (freerw) {
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			SDL_RWclose(rw);
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		}
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		return NULL;
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	}
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	music = (FLAC_music *)SDL_malloc ( sizeof (*music));
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	if (music) {
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		/* Initialize the music structure */
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		memset (music, 0, (sizeof (*music)));
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		FLAC_stop (music);
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		FLAC_setvolume (music, MIX_MAX_VOLUME);
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		music->section = -1;
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		music->rwops = rw;
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		music->freerw = freerw;
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		music->flac_data.max_to_read = 0;
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		music->flac_data.overflow = NULL;
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		music->flac_data.overflow_len = 0;
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		music->flac_data.overflow_read = 0;
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		music->flac_data.data = NULL;
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		music->flac_data.data_len = 0;
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		music->flac_data.data_read = 0;
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		init_stage++; // stage 1!
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		music->flac_decoder = flac.FLAC__stream_decoder_new ();
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		if (music->flac_decoder != NULL) {
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			init_stage++; // stage 2!
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			if (flac.FLAC__stream_decoder_init_stream(
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						music->flac_decoder,
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						flac_read_music_cb, flac_seek_music_cb,
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						flac_tell_music_cb, flac_length_music_cb,
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						flac_eof_music_cb, flac_write_music_cb,
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						flac_metadata_music_cb, flac_error_music_cb,
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						music) == FLAC__STREAM_DECODER_INIT_STATUS_OK ) {
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				init_stage++; // stage 3!
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				if (flac.FLAC__stream_decoder_process_until_end_of_metadata
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										(music->flac_decoder)) {
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					was_error = 0;
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				} else {
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					SDL_SetError("FLAC__stream_decoder_process_until_end_of_metadata() failed");
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				}
slouken@470
   355
			} else {
slouken@545
   356
				SDL_SetError("FLAC__stream_decoder_init_stream() failed");
slouken@382
   357
			}
slouken@545
   358
		} else {
slouken@545
   359
			SDL_SetError("FLAC__stream_decoder_new() failed");
slouken@382
   360
		}
slouken@382
   361
slouken@382
   362
		if (was_error) {
slouken@382
   363
			switch (init_stage) {
slouken@382
   364
				case 3:
slouken@382
   365
					flac.FLAC__stream_decoder_finish( music->flac_decoder );
slouken@382
   366
				case 2:
slouken@382
   367
					flac.FLAC__stream_decoder_delete( music->flac_decoder );
slouken@382
   368
				case 1:
slouken@382
   369
				case 0:
slouken@561
   370
					SDL_free(music);
slouken@521
   371
					if (freerw) {
slouken@521
   372
						SDL_RWclose(rw);
slouken@521
   373
					}
slouken@382
   374
					break;
slouken@382
   375
			}
slouken@382
   376
			return NULL;
slouken@382
   377
		}
slouken@521
   378
	} else {
slouken@382
   379
		SDL_OutOfMemory();
slouken@521
   380
		if (freerw) {
slouken@521
   381
			SDL_RWclose(rw);
slouken@521
   382
		}
slouken@521
   383
		return NULL;
slouken@382
   384
	}
slouken@382
   385
slouken@382
   386
	return music;
slouken@382
   387
}
slouken@382
   388
slouken@382
   389
/* Start playback of a given FLAC stream */
slouken@409
   390
void FLAC_play(FLAC_music *music)
slouken@409
   391
{
slouken@382
   392
	music->playing = 1;
slouken@382
   393
}
slouken@382
   394
slouken@382
   395
/* Return non-zero if a stream is currently playing */
slouken@409
   396
int FLAC_playing(FLAC_music *music)
slouken@409
   397
{
slouken@382
   398
	return(music->playing);
slouken@382
   399
}
slouken@382
   400
slouken@382
   401
/* Read some FLAC stream data and convert it for output */
slouken@409
   402
static void FLAC_getsome(FLAC_music *music)
slouken@409
   403
{
slouken@382
   404
	SDL_AudioCVT *cvt;
slouken@382
   405
slouken@522
   406
	/* GET AUDIO WAVE DATA */
slouken@382
   407
	// set the max number of characters to read
slouken@382
   408
	music->flac_data.max_to_read = 8192;
slouken@382
   409
	music->flac_data.data_len = music->flac_data.max_to_read;
slouken@382
   410
	music->flac_data.data_read = 0;
slouken@524
   411
	if (!music->flac_data.data) {
slouken@561
   412
		music->flac_data.data = (char *)SDL_malloc (music->flac_data.data_len);
slouken@524
   413
	}
slouken@382
   414
slouken@382
   415
	// we have data to read
slouken@382
   416
	while(music->flac_data.max_to_read > 0) {
slouken@382
   417
		// first check if there is data in the overflow from before
slouken@382
   418
		if (music->flac_data.overflow) {
slouken@382
   419
			size_t overflow_len = music->flac_data.overflow_read;
slouken@382
   420
slouken@382
   421
			if (overflow_len > music->flac_data.max_to_read) {
slouken@382
   422
				size_t overflow_extra_len = overflow_len -
slouken@382
   423
												music->flac_data.max_to_read;
slouken@382
   424
slouken@382
   425
				memcpy (music->flac_data.data+music->flac_data.data_read,
slouken@382
   426
					music->flac_data.overflow, music->flac_data.max_to_read);
slouken@382
   427
				music->flac_data.data_read += music->flac_data.max_to_read;
slouken@524
   428
				memcpy (music->flac_data.overflow,
slouken@382
   429
					music->flac_data.overflow + music->flac_data.max_to_read,
slouken@382
   430
					overflow_extra_len);
slouken@382
   431
				music->flac_data.overflow_len = overflow_extra_len;
slouken@522
   432
				music->flac_data.overflow_read = overflow_extra_len;
slouken@382
   433
				music->flac_data.max_to_read = 0;
slouken@382
   434
			}
slouken@382
   435
			else {
slouken@382
   436
				memcpy (music->flac_data.data+music->flac_data.data_read,
slouken@382
   437
					music->flac_data.overflow, overflow_len);
slouken@382
   438
				music->flac_data.data_read += overflow_len;
slouken@382
   439
				free (music->flac_data.overflow);
slouken@382
   440
				music->flac_data.overflow = NULL;
slouken@382
   441
				music->flac_data.overflow_len = 0;
slouken@382
   442
				music->flac_data.overflow_read = 0;
slouken@382
   443
				music->flac_data.max_to_read -= overflow_len;
slouken@382
   444
			}
slouken@382
   445
		}
slouken@382
   446
		else {
slouken@382
   447
			if (!flac.FLAC__stream_decoder_process_single (
slouken@382
   448
														music->flac_decoder)) {
slouken@382
   449
				music->flac_data.max_to_read = 0;
slouken@382
   450
			}
slouken@382
   451
slouken@382
   452
			if (flac.FLAC__stream_decoder_get_state (music->flac_decoder)
slouken@382
   453
									== FLAC__STREAM_DECODER_END_OF_STREAM) {
slouken@382
   454
				music->flac_data.max_to_read = 0;
slouken@382
   455
			}
slouken@382
   456
		}
slouken@382
   457
	}
slouken@382
   458
slouken@382
   459
	if (music->flac_data.data_read <= 0) {
slouken@382
   460
		if (music->flac_data.data_read == 0) {
slouken@382
   461
			music->playing = 0;
slouken@382
   462
		}
slouken@382
   463
		return;
slouken@382
   464
	}
slouken@382
   465
	cvt = &music->cvt;
slouken@487
   466
	if (music->section < 0) {
slouken@382
   467
slouken@382
   468
		SDL_BuildAudioCVT (cvt, AUDIO_S16, (Uint8)music->flac_data.channels,
slouken@382
   469
						(int)music->flac_data.sample_rate, mixer.format,
slouken@382
   470
		                mixer.channels, mixer.freq);
slouken@382
   471
		if (cvt->buf) {
slouken@382
   472
			free (cvt->buf);
slouken@382
   473
		}
slouken@561
   474
		cvt->buf = (Uint8 *)SDL_malloc (music->flac_data.data_len * cvt->len_mult);
slouken@487
   475
		music->section = 0;
slouken@382
   476
	}
slouken@382
   477
	if (cvt->buf) {
slouken@382
   478
		memcpy (cvt->buf, music->flac_data.data, music->flac_data.data_read);
slouken@382
   479
		if (cvt->needed) {
slouken@382
   480
			cvt->len = music->flac_data.data_read;
slouken@382
   481
			SDL_ConvertAudio (cvt);
slouken@382
   482
		}
slouken@382
   483
		else {
slouken@382
   484
			cvt->len_cvt = music->flac_data.data_read;
slouken@382
   485
		}
slouken@382
   486
		music->len_available = music->cvt.len_cvt;
slouken@382
   487
		music->snd_available = music->cvt.buf;
slouken@382
   488
	}
slouken@382
   489
	else {
slouken@382
   490
		SDL_SetError ("Out of memory");
slouken@382
   491
		music->playing = 0;
slouken@382
   492
	}
slouken@382
   493
}
slouken@382
   494
slouken@382
   495
/* Play some of a stream previously started with FLAC_play() */
slouken@409
   496
int FLAC_playAudio(FLAC_music *music, Uint8 *snd, int len)
slouken@409
   497
{
slouken@382
   498
	int mixable;
slouken@382
   499
slouken@382
   500
	while ((len > 0) && music->playing) {
slouken@382
   501
		if (!music->len_available) {
slouken@382
   502
			FLAC_getsome (music);
slouken@382
   503
		}
slouken@382
   504
		mixable = len;
slouken@382
   505
		if (mixable > music->len_available) {
slouken@382
   506
			mixable = music->len_available;
slouken@382
   507
		}
slouken@382
   508
		if (music->volume == MIX_MAX_VOLUME) {
slouken@382
   509
			memcpy (snd, music->snd_available, mixable);
slouken@382
   510
		}
slouken@382
   511
		else {
slouken@382
   512
			SDL_MixAudio (snd, music->snd_available, mixable, music->volume);
slouken@382
   513
		}
slouken@382
   514
		music->len_available -= mixable;
slouken@382
   515
		music->snd_available += mixable;
slouken@382
   516
		len -= mixable;
slouken@382
   517
		snd += mixable;
slouken@382
   518
	}
slouken@382
   519
slouken@382
   520
	return len;
slouken@382
   521
}
slouken@382
   522
slouken@382
   523
/* Stop playback of a stream previously started with FLAC_play() */
slouken@409
   524
void FLAC_stop(FLAC_music *music)
slouken@409
   525
{
slouken@382
   526
	music->playing = 0;
slouken@382
   527
}
slouken@382
   528
slouken@382
   529
/* Close the given FLAC_music object */
slouken@409
   530
void FLAC_delete(FLAC_music *music)
slouken@409
   531
{
slouken@382
   532
	if (music) {
slouken@382
   533
		if (music->flac_decoder) {
slouken@382
   534
			flac.FLAC__stream_decoder_finish (music->flac_decoder);
slouken@382
   535
			flac.FLAC__stream_decoder_delete (music->flac_decoder);
slouken@382
   536
		}
slouken@382
   537
slouken@382
   538
		if (music->flac_data.data) {
slouken@382
   539
			free (music->flac_data.data);
slouken@382
   540
		}
slouken@382
   541
slouken@382
   542
		if (music->flac_data.overflow) {
slouken@382
   543
			free (music->flac_data.overflow);
slouken@382
   544
		}
slouken@382
   545
slouken@382
   546
		if (music->cvt.buf) {
slouken@382
   547
			free (music->cvt.buf);
slouken@382
   548
		}
slouken@382
   549
slouken@521
   550
		if (music->freerw) {
slouken@521
   551
			SDL_RWclose(music->rwops);
slouken@521
   552
		}
slouken@382
   553
		free (music);
slouken@382
   554
	}
slouken@382
   555
}
slouken@382
   556
slouken@382
   557
/* Jump (seek) to a given position (time is in seconds) */
slouken@409
   558
void FLAC_jump_to_time(FLAC_music *music, double time)
slouken@409
   559
{
slouken@382
   560
	if (music) {
slouken@382
   561
		if (music->flac_decoder) {
slouken@382
   562
			double seek_sample = music->flac_data.sample_rate * time;
slouken@382
   563
slouken@382
   564
			// clear data if it has data
slouken@382
   565
			if (music->flac_data.data) {
slouken@382
   566
				free (music->flac_data.data);
slouken@382
   567
				music->flac_data.data = NULL;
slouken@382
   568
			}
slouken@382
   569
slouken@382
   570
			// clear overflow if it has data
slouken@382
   571
			if (music->flac_data.overflow) {
slouken@382
   572
				free (music->flac_data.overflow);
slouken@382
   573
				music->flac_data.overflow = NULL;
slouken@382
   574
			}
slouken@382
   575
slouken@382
   576
			if (!flac.FLAC__stream_decoder_seek_absolute (music->flac_decoder,
slouken@382
   577
												(FLAC__uint64)seek_sample)) {
slouken@382
   578
				if (flac.FLAC__stream_decoder_get_state (music->flac_decoder)
slouken@382
   579
										== FLAC__STREAM_DECODER_SEEK_ERROR) {
slouken@382
   580
					flac.FLAC__stream_decoder_flush (music->flac_decoder);
slouken@382
   581
				}
slouken@382
   582
slouken@382
   583
				SDL_SetError
slouken@382
   584
					("Seeking of FLAC stream failed: libFLAC seek failed.");
slouken@382
   585
			}
slouken@382
   586
		}
slouken@382
   587
		else {
slouken@382
   588
			SDL_SetError
slouken@382
   589
				("Seeking of FLAC stream failed: FLAC decoder was NULL.");
slouken@382
   590
		}
slouken@382
   591
	}
slouken@382
   592
	else {
slouken@382
   593
		SDL_SetError ("Seeking of FLAC stream failed: music was NULL.");
slouken@382
   594
	}
slouken@382
   595
}
slouken@382
   596
slouken@382
   597
#endif /* FLAC_MUSIC */