--- /dev/null
+/*
+ * Copyright (C) 2005-2012 Andre Noll <maan@systemlinux.org>
+ *
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
+
+/** \file check_wav.c Detect and delete a wav header. */
+
+#include <regex.h>
+
+#include "para.h"
+#include "string.h"
+#include "list.h"
+#include "sched.h"
+#include "buffer_tree.h"
+#include "error.h"
+#include "check_wav.h"
+
+/** Length of a standard wav header. */
+#define WAV_HEADER_LEN 44
+
+enum check_wav_state {
+ CWS_NEED_HEADER,
+ CWS_HAVE_HEADER,
+ CWS_NO_HEADER,
+};
+
+struct check_wav_task {
+ enum check_wav_state state;
+ struct task task;
+ struct btr_node *btrn;
+ size_t min_iqs;
+ /* Command line args. */
+ struct wav_params params;
+ /* Extracted from the wav header.*/
+ unsigned channels;
+ unsigned sample_format;
+ unsigned sample_rate;
+};
+
+static void check_wav_pre_select(struct sched *s, struct task *t)
+{
+ struct check_wav_task *cwt = container_of(t, struct check_wav_task, task);
+ int ret;
+
+ ret = btr_node_status(cwt->btrn, cwt->min_iqs, BTR_NT_INTERNAL);
+ if (ret != 0)
+ sched_min_delay(s);
+}
+
+static int check_wav_exec(struct btr_node *btrn, const char *cmd, char **result)
+{
+ struct check_wav_task *cwt = btr_context(btrn);
+ int val, header_val, given, arg;
+
+ header_val = cwt->channels;
+ arg = cwt->params.channels_arg;
+ given = cwt->params.channels_given;
+ if (!strcmp(cmd, "channels"))
+ goto out;
+
+ header_val = cwt->sample_rate;
+ arg = cwt->params.sample_rate_arg;
+ given = cwt->params.sample_rate_given;
+ if (!strcmp(cmd, "sample_rate"))
+ goto out;
+
+ header_val = cwt->sample_format;
+ arg = cwt->params.sample_format_arg;
+ given = cwt->params.sample_format_given;
+ if (!strcmp(cmd, "sample_format"))
+ goto out;
+
+ return -ERRNO_TO_PARA_ERROR(ENOTSUP);
+out:
+ if (given)
+ val = arg;
+ else {
+ switch (cwt->state) {
+ case CWS_HAVE_HEADER:
+ val = header_val;
+ break;
+ case CWS_NO_HEADER:
+ /* Use default value */
+ val = arg;
+ break;
+ default:
+ return -E_BTR_NAVAIL;
+ }
+ }
+ *result = make_message("%d", val);
+ return 1;
+}
+
+static void check_wav_post_select(__a_unused struct sched *s, struct task *t)
+{
+ struct check_wav_task *cwt = container_of(t, struct check_wav_task, task);
+ struct btr_node *btrn = cwt->btrn;
+ unsigned char *a;
+ size_t sz;
+ int ret;
+ uint16_t bps; /* bits per sample */
+ const char *sample_formats[] = {SAMPLE_FORMATS};
+
+ t->error = 0;
+ ret = btr_node_status(btrn, cwt->min_iqs, BTR_NT_INTERNAL);
+ if (ret <= 0)
+ goto out;
+ if (cwt->state != CWS_NEED_HEADER)
+ goto pushdown;
+ btr_merge(btrn, cwt->min_iqs);
+ sz = btr_next_buffer(btrn, (char **)&a);
+ if (sz < cwt->min_iqs) /* file size less than WAV_HEADER_SIZE */
+ goto pushdown;
+ cwt->min_iqs = 0;
+ /*
+ * The default byte ordering assumed for WAVE data files is
+ * little-endian. Files written using the big-endian byte ordering
+ * scheme have the identifier RIFX instead of RIFF.
+ */
+ if (a[0] != 'R' || a[1] != 'I' || a[2] != 'F' ||
+ (a[3] != 'F' && a[3] != 'X')) {
+ PARA_NOTICE_LOG("wav header not found\n");
+ cwt->state = CWS_NO_HEADER;
+ sprintf(t->status, "check wav: no header");
+ goto out;
+ }
+ PARA_INFO_LOG("found wav header\n");
+ cwt->state = CWS_HAVE_HEADER;
+ sprintf(t->status, "check wav: have header");
+ /* Only set those values which have not already been set. */
+ cwt->channels = (unsigned)a[22];
+ cwt->sample_rate = a[24] + (a[25] << 8) + (a[26] << 16) + (a[27] << 24);
+ bps = a[34] + ((unsigned)a[35] << 8);
+ if (bps != 8 && bps != 16) {
+ PARA_WARNING_LOG("%u bps not supported, assuming 16\n",
+ bps);
+ bps = 16;
+ }
+ /*
+ * 8-bit samples are stored as unsigned bytes, ranging from 0
+ * to 255. 16-bit samples are stored as 2's-complement signed
+ * integers, ranging from -32768 to 32767.
+ */
+ if (bps == 8)
+ cwt->sample_format = SF_U8;
+ else
+ cwt->sample_format = (a[3] == 'F')?
+ SF_S16_LE : SF_S16_BE;
+ PARA_NOTICE_LOG("%dHz, %s, %s\n", cwt->sample_rate,
+ cwt->channels == 1? "mono" : "stereo",
+ sample_formats[cwt->sample_format]);
+ btr_consume(btrn, WAV_HEADER_LEN);
+pushdown:
+ btr_pushdown(btrn);
+out:
+ t->error = ret;
+ if (ret < 0)
+ btr_remove_node(&cwt->btrn);
+}
+
+struct check_wav_task *check_wav_init(struct sched *s, struct btr_node *parent,
+ struct wav_params *params, struct btr_node **cwt_btrn)
+{
+ struct check_wav_task *cwt = para_calloc(sizeof(*cwt));
+
+ cwt->state = CWS_NEED_HEADER;
+ cwt->min_iqs = WAV_HEADER_LEN;
+ cwt->params = *params;
+ cwt->btrn = btr_new_node(&(struct btr_node_description)
+ EMBRACE(.name = "check_wav", .parent = parent,
+ .handler = check_wav_exec, .context = cwt));
+ sprintf(cwt->task.status, "check_wav");
+ cwt->task.pre_select = check_wav_pre_select;
+ cwt->task.post_select = check_wav_post_select;
+ if (cwt_btrn)
+ *cwt_btrn = cwt->btrn;
+ register_task(s, &cwt->task);
+ return cwt;
+}
+
+void check_wav_shutdown(struct check_wav_task *cwt)
+{
+ free(cwt);
+}
projects / paraslash.git / blobdiff