277 lines
8.5 KiB
C
277 lines
8.5 KiB
C
/**************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Copyright (C) 2007 Thom Johansen
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include <speex/speex.h>
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#include <speex/speex_resampler.h>
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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 <stdbool.h>
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#include "rbspeex.h"
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static unsigned int get_long_le(unsigned char *p);
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static bool get_wave_metadata(FILE *fd, int *numchan, int *bps, int *sr, int *numsamples);
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/* Read an unaligned 32-bit little endian long from buffer. */
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unsigned int get_long_le(unsigned char *p)
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{
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return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
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}
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void put_ushort_le(unsigned short x, unsigned char *out)
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{
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out[0] = x & 0xff;
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out[1] = x >> 8;
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}
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void put_uint_le(unsigned int x, unsigned char *out)
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{
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out[0] = x & 0xff;
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out[1] = (x >> 8) & 0xff;
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out[2] = (x >> 16) & 0xff;
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out[3] = x >> 24;
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}
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bool get_wave_metadata(FILE *fd, int *numchan, int *bps, int *sr, int *numsamples)
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{
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unsigned char buf[1024];
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unsigned long totalsamples = 0;
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unsigned long channels = 0;
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unsigned long bitspersample = 0;
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unsigned long numbytes = 0;
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size_t read_bytes;
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int i;
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if ((read_bytes = fread(buf, 1, 12, fd)) < 12)
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return false;
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if ((memcmp(buf, "RIFF",4) != 0) || (memcmp(&buf[8], "WAVE", 4) != 0))
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return false;
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/* iterate over WAVE chunks until 'data' chunk */
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while (1) {
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/* get chunk header */
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if ((read_bytes = fread(buf, 1, 8, fd)) < 8)
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return false;
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/* chunkSize */
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i = get_long_le(&buf[4]);
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if (memcmp(buf, "fmt ", 4) == 0) {
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/* get rest of chunk */
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if ((read_bytes = fread(buf, 1, 16, fd)) < 16)
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return false;
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i -= 16;
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channels = *numchan = buf[2] | (buf[3] << 8);
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*sr = get_long_le(&buf[4]);
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/* wBitsPerSample */
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bitspersample = *bps = buf[14] | (buf[15] << 8);
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} else if (memcmp(buf, "data", 4) == 0) {
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numbytes = i;
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break;
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} else if (memcmp(buf, "fact", 4) == 0) {
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/* dwSampleLength */
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if (i >= 4) {
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/* get rest of chunk */
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if ((read_bytes = fread(buf, 1, 4, fd)) < 4)
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return false;
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i -= 4;
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totalsamples = get_long_le(buf);
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}
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}
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/* seek to next chunk (even chunk sizes must be padded) */
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if (i & 0x01)
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i++;
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if (fseek(fd, i, SEEK_CUR) < 0)
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return false;
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}
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if ((numbytes == 0) || (channels == 0))
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return false;
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if (totalsamples == 0) {
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/* for PCM only */
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totalsamples = numbytes/((((bitspersample - 1) / 8) + 1)*channels);
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}
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*numsamples = totalsamples;
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return true;
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}
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/* We'll eat an entire WAV file here, and encode it with Speex, packing the
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* bits as tightly as we can. Output is completely raw, with absolutely
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* nothing to identify the contents. Files are left open, so remember to close
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* them.
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*/
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bool encode_file(FILE *fin, FILE *fout, float quality, int complexity,
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bool narrowband, float volume, char *errstr, size_t errlen)
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{
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spx_int16_t *in = NULL, *inpos;
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spx_int16_t enc_buf[640]; /* Max frame size */
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char cbits[200];
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void *st = NULL;
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SpeexResamplerState *resampler = NULL;
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SpeexBits bits;
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int i, tmp, target_sr, numchan, bps, sr, numsamples, frame_size, lookahead;
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int nbytes;
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bool ret = true;
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#if defined(__BIG_ENDIAN__)
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int a;
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#endif
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if (!get_wave_metadata(fin, &numchan, &bps, &sr, &numsamples)) {
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snprintf(errstr, errlen, "invalid WAV file");
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return false;
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}
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if (numchan != 1) {
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snprintf(errstr, errlen, "input file must be mono");
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return false;
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}
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if (bps != 16) {
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snprintf(errstr, errlen, "samples must be 16 bit");
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return false;
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}
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/* Allocate an encoder of specified type, defaults to wideband */
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st = speex_encoder_init(narrowband ? &speex_nb_mode : &speex_wb_mode);
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if (narrowband)
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target_sr = 8000;
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else
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target_sr = 16000;
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speex_bits_init(&bits);
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/* VBR */
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tmp = 1;
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speex_encoder_ctl(st, SPEEX_SET_VBR, &tmp);
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/* Quality, 0-10 */
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speex_encoder_ctl(st, SPEEX_SET_VBR_QUALITY, &quality);
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/* Complexity, 0-10 */
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speex_encoder_ctl(st, SPEEX_SET_COMPLEXITY, &complexity);
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speex_encoder_ctl(st, SPEEX_GET_FRAME_SIZE, &frame_size);
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speex_encoder_ctl(st, SPEEX_GET_LOOKAHEAD, &lookahead);
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/* Read input samples into a buffer */
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in = calloc(numsamples + lookahead, sizeof(spx_int16_t));
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if (in == NULL) {
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snprintf(errstr, errlen, "could not allocate clip memory");
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ret = false;
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goto finish;
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}
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if (fread(in, 2, numsamples, fin) != numsamples) {
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snprintf(errstr, errlen, "could not read input file data");
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ret = false;
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goto finish;
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}
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#if defined(__BIG_ENDIAN__)
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/* byteswap read bytes to host endianess. */
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a = numsamples;
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while(a--) {
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*(in + a) = ((unsigned short)(*(in + a)) >> 8) & 0x00ff
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| ((unsigned short)(*(in + a)) << 8) & 0xff00;
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}
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#endif
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if (volume != 1.0f) {
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for (i = 0; i < numsamples; ++i)
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in[i] *= volume;
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}
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if (sr != target_sr) {
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resampler = speex_resampler_init(1, sr, target_sr, 10, NULL);
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speex_resampler_skip_zeros(resampler);
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}
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/* There will be 'lookahead' samples of zero at the end of the array, to
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* make sure the Speex encoder is allowed to spit out all its data at clip
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* end */
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numsamples += lookahead;
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inpos = in;
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while (numsamples > 0) {
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int samples = frame_size;
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/* Check if we need to resample */
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if (sr != target_sr) {
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spx_uint32_t in_len = numsamples, out_len = frame_size;
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double resample_factor = (double)sr/(double)target_sr;
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/* Calculate how many input samples are needed for one full frame
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* out, and add some, just in case. */
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spx_uint32_t samples_in = frame_size*resample_factor + 50;
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/* Limit this or resampler will try to allocate it all on stack */
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if (in_len > samples_in)
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in_len = samples_in;
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speex_resampler_process_int(resampler, 0, inpos, &in_len,
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enc_buf, &out_len);
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inpos += in_len;
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samples = out_len;
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numsamples -= in_len;
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} else {
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if (samples > numsamples)
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samples = numsamples;
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memcpy(enc_buf, inpos, samples*2);
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inpos += frame_size;
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numsamples -= frame_size;
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}
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/* Pad out with zeros if we didn't fill all input */
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memset(enc_buf + samples, 0, (frame_size - samples)*2);
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if (speex_encode_int(st, enc_buf, &bits) < 0) {
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snprintf(errstr, errlen, "encoder error");
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ret = false;
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goto finish;
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}
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/* Copy the bits to an array of char that can be written */
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nbytes = speex_bits_write_whole_bytes(&bits, cbits, 200);
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/* Write the compressed data */
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if (fwrite(cbits, 1, nbytes, fout) != nbytes) {
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snprintf(errstr, errlen, "could not write output data");
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ret = false;
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goto finish;
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}
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}
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/* Squeeze out the last bits */
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nbytes = speex_bits_write(&bits, cbits, 200);
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if (fwrite(cbits, 1, nbytes, fout) != nbytes) {
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snprintf(errstr, errlen, "could not write output data");
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ret = false;
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}
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finish:
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if (st != NULL)
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speex_encoder_destroy(st);
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speex_bits_destroy(&bits);
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if (resampler != NULL)
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speex_resampler_destroy(resampler);
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if (in != NULL)
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free(in);
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return ret;
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}
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