diff options
author | Dominik Wenger <domonoky@googlemail.com> | 2007-12-14 16:04:38 +0000 |
---|---|---|
committer | Dominik Wenger <domonoky@googlemail.com> | 2007-12-14 16:04:38 +0000 |
commit | ed047d9db1dcee92afb8fe6bacb5d90ccb39481e (patch) | |
tree | 163bfbbf5316f4e92315c726516515eb4f04a120 /tools/rbspeex/rbspeex.c | |
parent | b2f7c61f84191d3d15606400165efe931bb66d2a (diff) | |
download | rockbox-ed047d9db1dcee92afb8fe6bacb5d90ccb39481e.tar.gz rockbox-ed047d9db1dcee92afb8fe6bacb5d90ccb39481e.zip |
refactor rbspeex, so we build a librbspeex.a for linking into rbutil.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15924 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'tools/rbspeex/rbspeex.c')
-rw-r--r-- | tools/rbspeex/rbspeex.c | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/tools/rbspeex/rbspeex.c b/tools/rbspeex/rbspeex.c new file mode 100644 index 0000000000..e211b9606a --- /dev/null +++ b/tools/rbspeex/rbspeex.c @@ -0,0 +1,261 @@ +/************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * + * Copyright (C) 2007 Thom Johansen + * + * All files in this archive are subject to the GNU General Public License. + * See the file COPYING in the source tree root for full license agreement. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ***************************************************************************/ + +#include <speex/speex.h> +#include <speex/speex_resampler.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <stdbool.h> + +#include "rbspeex.h" + +/* Read an unaligned 32-bit little endian long from buffer. */ +unsigned int get_long_le(unsigned char *p) +{ + return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24); +} + +void put_ushort_le(unsigned short x, unsigned char *out) +{ + out[0] = x & 0xff; + out[1] = x >> 8; +} + +void put_uint_le(unsigned int x, unsigned char *out) +{ + out[0] = x & 0xff; + out[1] = (x >> 8) & 0xff; + out[2] = (x >> 16) & 0xff; + out[3] = x >> 24; +} + + + +bool get_wave_metadata(FILE *fd, int *numchan, int *bps, int *sr, int *numsamples) +{ + unsigned char buf[1024]; + unsigned long totalsamples = 0; + unsigned long channels = 0; + unsigned long bitspersample = 0; + unsigned long numbytes = 0; + size_t read_bytes; + int i; + + if ((read_bytes = fread(buf, 1, 12, fd)) < 12) + return false; + + if ((memcmp(buf, "RIFF",4) != 0) || (memcmp(&buf[8], "WAVE", 4) != 0)) + return false; + + /* iterate over WAVE chunks until 'data' chunk */ + while (1) { + /* get chunk header */ + if ((read_bytes = fread(buf, 1, 8, fd)) < 8) + return false; + + /* chunkSize */ + i = get_long_le(&buf[4]); + + if (memcmp(buf, "fmt ", 4) == 0) { + /* get rest of chunk */ + if ((read_bytes = fread(buf, 1, 16, fd)) < 16) + return false; + + i -= 16; + + channels = *numchan = buf[2] | (buf[3] << 8); + *sr = get_long_le(&buf[4]); + /* wBitsPerSample */ + bitspersample = *bps = buf[14] | (buf[15] << 8); + } else if (memcmp(buf, "data", 4) == 0) { + numbytes = i; + break; + } else if (memcmp(buf, "fact", 4) == 0) { + /* dwSampleLength */ + if (i >= 4) { + /* get rest of chunk */ + if ((read_bytes = fread(buf, 1, 4, fd)) < 4) + return false; + + i -= 4; + totalsamples = get_long_le(buf); + } + } + + /* seek to next chunk (even chunk sizes must be padded) */ + if (i & 0x01) + i++; + + if (fseek(fd, i, SEEK_CUR) < 0) + return false; + } + + if ((numbytes == 0) || (channels == 0)) + return false; + + if (totalsamples == 0) { + /* for PCM only */ + totalsamples = numbytes/((((bitspersample - 1) / 8) + 1)*channels); + } + *numsamples = totalsamples; + return true; +} + +/* We'll eat an entire WAV file here, and encode it with Speex, packing the + * bits as tightly as we can. Output is completely raw, with absolutely + * nothing to identify the contents. Files are left open, so remember to close + * them. + */ +bool encode_file(FILE *fin, FILE *fout, float quality, int complexity, + bool narrowband, float volume, char *errstr, size_t errlen) +{ + spx_int16_t *in = NULL, *inpos; + spx_int16_t enc_buf[640]; /* Max frame size */ + char cbits[200]; + void *st = NULL; + SpeexResamplerState *resampler = NULL; + SpeexBits bits; + int i, tmp, target_sr, numchan, bps, sr, numsamples, frame_size, lookahead; + int nbytes; + bool ret = true; + + if (!get_wave_metadata(fin, &numchan, &bps, &sr, &numsamples)) { + snprintf(errstr, errlen, "invalid WAV file"); + return false; + } + if (numchan != 1) { + snprintf(errstr, errlen, "input file must be mono"); + return false; + } + if (bps != 16) { + snprintf(errstr, errlen, "samples must be 16 bit"); + return false; + } + + /* Allocate an encoder of specified type, defaults to wideband */ + st = speex_encoder_init(narrowband ? &speex_nb_mode : &speex_wb_mode); + if (narrowband) + target_sr = 8000; + else + target_sr = 16000; + speex_bits_init(&bits); + + /* VBR */ + tmp = 1; + speex_encoder_ctl(st, SPEEX_SET_VBR, &tmp); + /* Quality, 0-10 */ + speex_encoder_ctl(st, SPEEX_SET_VBR_QUALITY, &quality); + /* Complexity, 0-10 */ + speex_encoder_ctl(st, SPEEX_SET_COMPLEXITY, &complexity); + speex_encoder_ctl(st, SPEEX_GET_FRAME_SIZE, &frame_size); + speex_encoder_ctl(st, SPEEX_GET_LOOKAHEAD, &lookahead); + + /* Read input samples into a buffer */ + in = calloc(numsamples + lookahead, sizeof(spx_int16_t)); + if (in == NULL) { + snprintf(errstr, errlen, "could not allocate clip memory"); + ret = false; + goto finish; + } + if (fread(in, 2, numsamples, fin) != numsamples) { + snprintf(errstr, errlen, "could not read input file data"); + ret = false; + goto finish; + } + + if (volume != 1.0f) { + for (i = 0; i < numsamples; ++i) + in[i] *= volume; + } + + if (sr != target_sr) { + resampler = speex_resampler_init(1, sr, target_sr, 10, NULL); + speex_resampler_skip_zeros(resampler); + } + + /* There will be 'lookahead' samples of zero at the end of the array, to + * make sure the Speex encoder is allowed to spit out all its data at clip + * end */ + numsamples += lookahead; + + inpos = in; + while (numsamples > 0) { + int samples = frame_size; + + /* Check if we need to resample */ + if (sr != target_sr) { + spx_uint32_t in_len = numsamples, out_len = frame_size; + double resample_factor = (double)sr/(double)target_sr; + /* Calculate how many input samples are needed for one full frame + * out, and add some, just in case. */ + spx_uint32_t samples_in = frame_size*resample_factor + 50; + + /* Limit this or resampler will try to allocate it all on stack */ + if (in_len > samples_in) + in_len = samples_in; + speex_resampler_process_int(resampler, 0, inpos, &in_len, + enc_buf, &out_len); + inpos += in_len; + samples = out_len; + numsamples -= in_len; + } else { + if (samples > numsamples) + samples = numsamples; + memcpy(enc_buf, inpos, samples*2); + inpos += frame_size; + numsamples -= frame_size; + } + /* Pad out with zeros if we didn't fill all input */ + memset(enc_buf + samples, 0, (frame_size - samples)*2); + + if (speex_encode_int(st, enc_buf, &bits) < 0) { + snprintf(errstr, errlen, "encoder error"); + ret = false; + goto finish; + } + + /* Copy the bits to an array of char that can be written */ + nbytes = speex_bits_write_whole_bytes(&bits, cbits, 200); + + /* Write the compressed data */ + if (fwrite(cbits, 1, nbytes, fout) != nbytes) { + snprintf(errstr, errlen, "could not write output data"); + ret = false; + goto finish; + } + } + /* Squeeze out the last bits */ + nbytes = speex_bits_write(&bits, cbits, 200); + if (fwrite(cbits, 1, nbytes, fout) != nbytes) { + snprintf(errstr, errlen, "could not write output data"); + ret = false; + } + +finish: + if (st != NULL) + speex_encoder_destroy(st); + speex_bits_destroy(&bits); + if (resampler != NULL) + speex_resampler_destroy(resampler); + if (in != NULL) + free(in); + return ret; +} + + |