Restructure: Move wave from common code to 'libwave'
This commit is contained in:
Andreas Eversberg
6
src/libwave/Makefile.am
Normal file
6
src/libwave/Makefile.am
Normal file
@@ -0,0 +1,6 @@
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AM_CPPFLAGS = -Wall -Wextra -g $(all_includes)
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noinst_LIBRARIES = libwave.a
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libwave_a_SOURCES = \
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wave.c
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512
src/libwave/wave.c
Normal file
512
src/libwave/wave.c
Normal file
@@ -0,0 +1,512 @@
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/* wave recording and playback functions
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*
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* (C) 2016 by Andreas Eversberg <jolly@eversberg.eu>
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* All Rights Reserved
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <pthread.h>
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#include "../common/sample.h"
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#include "wave.h"
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/* NOTE: No locking required for writing and reading buffer pointers, since 'int' is atomic on >=32 bit machines */
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static void *record_child(void *arg)
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{
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wave_rec_t *rec = (wave_rec_t *)arg;
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int to_write, to_end, len;
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while (!rec->finish || rec->buffer_writep != rec->buffer_readp) {
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/* how much data is in buffer */
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to_write = (rec->buffer_size + rec->buffer_writep - rec->buffer_readp) % rec->buffer_size;
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if (to_write == 0) {
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usleep(10000);
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continue;
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}
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/* only write up to the end of buffer */
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to_end = rec->buffer_size - rec->buffer_readp;
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if (to_end < to_write)
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to_write = to_end;
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/* write */
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errno = 0;
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len = fwrite(rec->buffer + rec->buffer_readp, 1, to_write, rec->fp);
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/* quit on error */
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if (len < 0) {
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error:
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fprintf(stderr, "Failed to write to recording WAVE file! (errno %d)\n", errno);
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rec->finish = 1;
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return NULL;
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}
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/* increment read pointer */
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rec->buffer_readp += len;
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if (rec->buffer_readp == rec->buffer_size)
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rec->buffer_readp = 0;
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/* quit on end of file */
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if (len != to_write)
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goto error;
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}
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return NULL;
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}
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static void *playback_child(void *arg)
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{
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wave_play_t *play = (wave_play_t *)arg;
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int to_read, to_end, len;
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while(!play->finish) {
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/* how much space is in buffer */
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to_read = (play->buffer_size + play->buffer_readp - play->buffer_writep - 1) % play->buffer_size;
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if (to_read == 0) {
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usleep(10000);
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continue;
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}
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/* only read up to the end of buffer */
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to_end = play->buffer_size - play->buffer_writep;
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if (to_end < to_read)
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to_read = to_end;
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/* read */
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len = fread(play->buffer + play->buffer_writep, 1, to_read, play->fp);
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/* quit on error */
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if (len < 0) {
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fprintf(stderr, "Failed to read from playback WAVE file! (errno %d)\n", errno);
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play->finish = 1;
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return NULL;
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}
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/* increment write pointer */
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play->buffer_writep += len;
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if (play->buffer_writep == play->buffer_size)
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play->buffer_writep = 0;
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/* quit on end of file */
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if (len != to_read) {
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play->finish = 1;
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return NULL;
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}
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}
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return NULL;
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}
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struct fmt {
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uint16_t format; /* 1 = pcm, 2 = adpcm */
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uint16_t channels; /* number of channels */
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uint32_t sample_rate; /* sample rate */
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uint32_t data_rate; /* data rate */
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uint16_t bytes_sample; /* bytes per sample (all channels) */
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uint16_t bits_sample; /* bits per sample (one channel) */
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};
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int wave_create_record(wave_rec_t *rec, const char *filename, int samplerate, int channels, double max_deviation)
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{
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/* RIFFxxxxWAVEfmt xxxx(fmt size)dataxxxx... */
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char dummyheader[4 + 4 + 4 + 4 + 4 + sizeof(struct fmt) + 4 + 4];
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int __attribute__((__unused__)) len;
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int rc;
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memset(rec, 0, sizeof(*rec));
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rec->samplerate = samplerate;
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rec->channels = channels;
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rec->max_deviation = max_deviation;
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rec->fp = fopen(filename, "w");
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if (!rec->fp) {
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fprintf(stderr, "Failed to open recording file '%s'! (errno %d)\n", filename, errno);
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return -errno;
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}
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memset(&dummyheader, 0, sizeof(dummyheader));
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len = fwrite(dummyheader, 1, sizeof(dummyheader), rec->fp);
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rec->buffer_size = samplerate * 2 * channels;
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rec->buffer = calloc(rec->buffer_size, 1);
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if (!rec->buffer) {
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fprintf(stderr, "No mem!\n");
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rc = ENOMEM;
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goto error;
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}
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rc = pthread_create(&rec->tid, NULL, record_child, rec);
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if (rc < 0) {
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fprintf(stderr, "Failed to create thread to record WAVE file! (errno %d)\n", errno);
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goto error;
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}
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printf("*** Writing WAVE file to %s.\n", filename);
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return 0;
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error:
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if (rec->buffer) {
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free(rec->buffer);
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rec->buffer = NULL;
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}
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if (rec->fp) {
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fclose(rec->fp);
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rec->fp = NULL;
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}
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return rc;
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}
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int wave_create_playback(wave_play_t *play, const char *filename, int samplerate, int channels, double max_deviation)
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{
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uint8_t buffer[256];
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struct fmt fmt;
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int32_t size, chunk, len;
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int gotfmt = 0, gotdata = 0;
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int rc = -EINVAL;
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memset(&fmt, 0, sizeof(fmt));
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memset(play, 0, sizeof(*play));
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play->channels = channels;
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play->max_deviation = max_deviation;
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play->fp = fopen(filename, "r");
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if (!play->fp) {
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fprintf(stderr, "Failed to open playback file '%s'! (errno %d)\n", filename, errno);
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return -errno;
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}
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len = fread(buffer, 1, 12, play->fp);
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if (len != 12) {
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fprintf(stderr, "Failed to read RIFF header!\n");
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rc = -EIO;
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goto error;
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}
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if (!!strncmp((char *)buffer, "RIFF", 4)) {
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fprintf(stderr, "Missing RIFF header, seems that this is no WAVE file!\n");
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rc = -EINVAL;
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goto error;
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}
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size = buffer[4] + (buffer[5] << 8) + (buffer[6] << 16) + (buffer[7] << 24);
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if (!!strncmp((char *)buffer + 8, "WAVE", 4)) {
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fprintf(stderr, "Missing WAVE header, seems that this is no WAVE file!\n");
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rc = -EINVAL;
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goto error;
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}
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size -= 4;
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while (size) {
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if (size < 8) {
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fprintf(stderr, "Short read of WAVE file!\n");
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rc = -EINVAL;
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goto error;
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}
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len = fread(buffer, 1, 8, play->fp);
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if (len != 8) {
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fprintf(stderr, "Failed to read chunk of WAVE file!\n");
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rc = -EIO;
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goto error;
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}
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chunk = buffer[4] + (buffer[5] << 8) + (buffer[6] << 16) + (buffer[7] << 24);
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size -= 8 + chunk;
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if (size < 0) {
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fprintf(stderr, "WAVE error: Chunk '%c%c%c%c' overflows file size!\n", buffer[4], buffer[5], buffer[6], buffer[7]);
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rc = -EIO;
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goto error;
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}
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if (!strncmp((char *)buffer, "fmt ", 4)) {
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if (chunk < 16 || chunk > (int)sizeof(buffer)) {
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fprintf(stderr, "WAVE error: Short or corrupt 'fmt' chunk!\n");
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rc = -EINVAL;
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goto error;
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}
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len = fread(buffer, 1, chunk, play->fp);
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fmt.format = buffer[0] + (buffer[1] << 8);
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fmt.channels = buffer[2] + (buffer[3] << 8);
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fmt.sample_rate = buffer[4] + (buffer[5] << 8) + (buffer[6] << 16) + (buffer[7] << 24);
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fmt.data_rate = buffer[8] + (buffer[9] << 8) + (buffer[10] << 16) + (buffer[11] << 24);
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fmt.bytes_sample = buffer[12] + (buffer[13] << 8);
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fmt.bits_sample = buffer[14] + (buffer[15] << 8);
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gotfmt = 1;
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} else
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if (!strncmp((char *)buffer, "data", 4)) {
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if (!gotfmt) {
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fprintf(stderr, "WAVE error: 'data' without 'fmt' chunk!\n");
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rc = -EINVAL;
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goto error;
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}
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gotdata = 1;
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break;
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} else {
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while(chunk > (int)sizeof(buffer)) {
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len = fread(buffer, 1, sizeof(buffer), play->fp);
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chunk -= sizeof(buffer);
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}
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if (chunk)
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len = fread(buffer, 1, chunk, play->fp);
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}
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}
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if (!gotfmt || !gotdata) {
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fprintf(stderr, "WAVE error: Missing 'data' or 'fmt' chunk!\n");
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rc = -EINVAL;
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goto error;
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}
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if (fmt.format != 1) {
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fprintf(stderr, "WAVE error: We support only PCM files!\n");
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rc = -EINVAL;
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goto error;
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}
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if (fmt.channels !=channels) {
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fprintf(stderr, "WAVE error: We expect %d cannel(s), but wave file only has %d channel(s)\n", channels, fmt.channels);
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rc = -EINVAL;
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goto error;
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}
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if ((int)fmt.sample_rate != samplerate) {
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fprintf(stderr, "WAVE error: The WAVE file's sample rate (%d) does not match our sample rate (%d)!\n", fmt.sample_rate, samplerate);
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rc = -EINVAL;
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goto error;
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}
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if ((int)fmt.data_rate != 2 * channels * samplerate) {
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fprintf(stderr, "WAVE error: The WAVE file's data rate is only %d bytes per second, but we expect %d bytes per second (2 bytes per sample * channels * samplerate)!\n", fmt.data_rate, 2 * channels * samplerate);
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rc = -EINVAL;
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goto error;
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}
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if (fmt.bytes_sample != 2 * channels) {
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fprintf(stderr, "WAVE error: The WAVE file's bytes per sample is only %d, but we expect %d bytes sample (2 bytes per sample * channels)!\n", fmt.bytes_sample, 2 * channels);
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rc = -EINVAL;
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goto error;
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}
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if (fmt.bits_sample != 16) {
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fprintf(stderr, "WAVE error: We support only 16 bit files!\n");
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rc = -EINVAL;
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goto error;
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}
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play->left = chunk / 2 / channels;
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play->buffer_size = samplerate * 2 * channels;
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play->buffer = calloc(play->buffer_size, 1);
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if (!play->buffer) {
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fprintf(stderr, "No mem!\n");
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rc = -ENOMEM;
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goto error;
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}
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rc = pthread_create(&play->tid, NULL, playback_child, play);
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if (rc < 0) {
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fprintf(stderr, "Failed to create thread to playback WAVE file! (errno %d)\n", errno);
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goto error;
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}
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printf("*** Reading WAVE file from %s.\n", filename);
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return 0;
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error:
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if (play->buffer) {
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free(play->buffer);
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play->buffer = NULL;
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}
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if (play->fp) {
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fclose(play->fp);
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play->fp = NULL;
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}
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return rc;
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}
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int wave_write(wave_rec_t *rec, sample_t **samples, int length)
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{
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double max_deviation = rec->max_deviation;
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int32_t value;
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int __attribute__((__unused__)) len;
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int i, c;
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int to_write;
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/* on error, don't write more */
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if (rec->finish)
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return 0;
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/* how much space is in buffer */
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to_write = (rec->buffer_size + rec->buffer_readp - rec->buffer_writep - 1) % rec->buffer_size;
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to_write /= 2 * rec->channels;
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if (to_write < length)
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fprintf(stderr, "Record WAVE buffer overflow.\n");
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else
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to_write = length;
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if (to_write == 0)
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return 0;
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for (i = 0; i < to_write; i++) {
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for (c = 0; c < rec->channels; c++) {
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value = samples[c][i] / max_deviation * 32767.0;
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if (value > 32767)
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value = 32767;
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else if (value < -32767)
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value = -32767;
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rec->buffer[rec->buffer_writep] = value;
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rec->buffer_writep = (rec->buffer_writep + 1) % rec->buffer_size;
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rec->buffer[rec->buffer_writep] = value >> 8;
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rec->buffer_writep = (rec->buffer_writep + 1) % rec->buffer_size;
|
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}
|
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}
|
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rec->written += to_write;
|
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|
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return to_write;
|
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}
|
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|
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int wave_read(wave_play_t *play, sample_t **samples, int length)
|
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{
|
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double max_deviation = play->max_deviation;
|
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int16_t value; /* must be int16, so assembling bytes work */
|
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int __attribute__((__unused__)) len;
|
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int i, c;
|
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int to_read;
|
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|
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/* we have finished */
|
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if (play->left == 0) {
|
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to_read = 0;
|
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read_empty:
|
||||
for (i = to_read; i < length; i++) {
|
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for (c = 0; c < play->channels; c++)
|
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samples[c][i] = 0;
|
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}
|
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return length;
|
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}
|
||||
|
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/* how much do we read from buffer */
|
||||
to_read = (play->buffer_size + play->buffer_writep - play->buffer_readp) % play->buffer_size;
|
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to_read /= 2 * play->channels;
|
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if (to_read > (int)play->left)
|
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to_read = play->left;
|
||||
if (to_read > length)
|
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to_read = length;
|
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|
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if (to_read == 0 && play->finish) {
|
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if (play->left) {
|
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printf("*** Finished reading WAVE file. (short read)\n");
|
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play->left = 0;
|
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}
|
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goto read_empty;
|
||||
}
|
||||
|
||||
/* read from buffer */
|
||||
for (i = 0; i < to_read; i++) {
|
||||
for (c = 0; c < play->channels; c++) {
|
||||
value = play->buffer[play->buffer_readp];
|
||||
play->buffer_readp = (play->buffer_readp + 1) % play->buffer_size;
|
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value |= play->buffer[play->buffer_readp] << 8;
|
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play->buffer_readp = (play->buffer_readp + 1) % play->buffer_size;
|
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samples[c][i] = (double)value / 32767.0 * max_deviation;
|
||||
}
|
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}
|
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play->left -= to_read;
|
||||
|
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if (!play->left)
|
||||
printf("*** Finished reading WAVE file.\n");
|
||||
|
||||
if (to_read < length)
|
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goto read_empty;
|
||||
|
||||
return length;
|
||||
}
|
||||
|
||||
void wave_destroy_record(wave_rec_t *rec)
|
||||
{
|
||||
uint8_t buffer[256];
|
||||
uint32_t size, wsize;
|
||||
struct fmt fmt;
|
||||
int __attribute__((__unused__)) len;
|
||||
|
||||
if (!rec->fp)
|
||||
return;
|
||||
|
||||
/* on error, thread has terminated */
|
||||
if (rec->finish) {
|
||||
fclose(rec->fp);
|
||||
rec->fp = NULL;
|
||||
return;
|
||||
}
|
||||
|
||||
/* finish thread */
|
||||
rec->finish = 1;
|
||||
pthread_join(rec->tid, NULL);
|
||||
|
||||
/* cue */
|
||||
fprintf(rec->fp, "cue %c%c%c%c%c%c%c%c", 4, 0, 0, 0, 0,0,0,0);
|
||||
|
||||
/* LIST */
|
||||
fprintf(rec->fp, "LIST%c%c%c%cadtl", 4, 0, 0, 0);
|
||||
|
||||
/* go to header */
|
||||
fseek(rec->fp, 0, SEEK_SET);
|
||||
|
||||
size = 2 * rec->written * rec->channels;
|
||||
wsize = 4 + 8 + sizeof(fmt) + 8 + size + 8 + 4 + 8 + 4;
|
||||
|
||||
/* RIFF */
|
||||
fprintf(rec->fp, "RIFF%c%c%c%c", wsize & 0xff, (wsize >> 8) & 0xff, (wsize >> 16) & 0xff, wsize >> 24);
|
||||
|
||||
/* WAVE */
|
||||
fprintf(rec->fp, "WAVE");
|
||||
|
||||
/* fmt */
|
||||
fprintf(rec->fp, "fmt %c%c%c%c", (uint8_t)sizeof(fmt), 0, 0, 0);
|
||||
fmt.format = 1;
|
||||
fmt.channels = rec->channels;
|
||||
fmt.sample_rate = rec->samplerate; /* samples/sec */
|
||||
fmt.data_rate = rec->samplerate * 2 * rec->channels; /* full data rate */
|
||||
fmt.bytes_sample = 2 * rec->channels; /* all channels */
|
||||
fmt.bits_sample = 16; /* one channel */
|
||||
buffer[0] = fmt.format;
|
||||
buffer[1] = fmt.format >> 8;
|
||||
buffer[2] = fmt.channels;
|
||||
buffer[3] = fmt.channels >> 8;
|
||||
buffer[4] = fmt.sample_rate;
|
||||
buffer[5] = fmt.sample_rate >> 8;
|
||||
buffer[6] = fmt.sample_rate >> 16;
|
||||
buffer[7] = fmt.sample_rate >> 24;
|
||||
buffer[8] = fmt.data_rate;
|
||||
buffer[9] = fmt.data_rate >> 8;
|
||||
buffer[10] = fmt.data_rate >> 16;
|
||||
buffer[11] = fmt.data_rate >> 24;
|
||||
buffer[12] = fmt.bytes_sample;
|
||||
buffer[13] = fmt.bytes_sample >> 8;
|
||||
buffer[14] = fmt.bits_sample;
|
||||
buffer[15] = fmt.bits_sample >> 8;
|
||||
len = fwrite(buffer, 1, sizeof(fmt), rec->fp);
|
||||
|
||||
/* data */
|
||||
fprintf(rec->fp, "data%c%c%c%c", size & 0xff, (size >> 8) & 0xff, (size >> 16) & 0xff, size >> 24);
|
||||
|
||||
free(rec->buffer);
|
||||
rec->buffer = NULL;
|
||||
fclose(rec->fp);
|
||||
rec->fp = NULL;
|
||||
|
||||
printf("*** WAVE file written.\n");
|
||||
}
|
||||
|
||||
void wave_destroy_playback(wave_play_t *play)
|
||||
{
|
||||
if (!play->fp)
|
||||
return;
|
||||
|
||||
/* finish thread if not already */
|
||||
play->finish = 1;
|
||||
pthread_join(play->tid, NULL);
|
||||
|
||||
free(play->buffer);
|
||||
play->buffer = NULL;
|
||||
fclose(play->fp);
|
||||
play->fp = NULL;
|
||||
}
|
||||
|
||||
37
src/libwave/wave.h
Normal file
37
src/libwave/wave.h
Normal file
@@ -0,0 +1,37 @@
|
||||
|
||||
typedef struct wave_rec {
|
||||
FILE *fp;
|
||||
int channels;
|
||||
double max_deviation;
|
||||
int samplerate;
|
||||
uint32_t written; /* how much samples written */
|
||||
/* thread stuff */
|
||||
pthread_t tid; /* file io thread id */
|
||||
int finish; /* indicates end of thread */
|
||||
uint8_t *buffer; /* buffer to store sample data */
|
||||
int buffer_size; /* size of buffer in bytes */
|
||||
int buffer_readp; /* read pointer to next byte in buffer */
|
||||
int buffer_writep; /* write pointer to next byte in buffer */
|
||||
} wave_rec_t;
|
||||
|
||||
typedef struct wave_play {
|
||||
FILE *fp;
|
||||
int channels;
|
||||
double max_deviation;
|
||||
uint32_t left; /* how much samples left */
|
||||
/* thread stuff */
|
||||
pthread_t tid; /* file io thread id */
|
||||
int finish; /* indicates end of thread */
|
||||
uint8_t *buffer; /* buffer to store sample data */
|
||||
int buffer_size; /* size of buffer in bytes */
|
||||
int buffer_readp; /* read pointer to next byte in buffer */
|
||||
int buffer_writep; /* write pointer to next byte in buffer */
|
||||
} wave_play_t;
|
||||
|
||||
int wave_create_record(wave_rec_t *rec, const char *filename, int samplerate, int channels, double max_deviation);
|
||||
int wave_create_playback(wave_play_t *play, const char *filename, int samplerate, int channels, double max_deviation);
|
||||
int wave_read(wave_play_t *play, sample_t **samples, int length);
|
||||
int wave_write(wave_rec_t *rec, sample_t **samples, int length);
|
||||
void wave_destroy_record(wave_rec_t *rec);
|
||||
void wave_destroy_playback(wave_play_t *play);
|
||||
|
||||
Reference in New Issue
Block a user