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-rw-r--r--flow/gsl/gslloader-wav.c442
1 files changed, 442 insertions, 0 deletions
diff --git a/flow/gsl/gslloader-wav.c b/flow/gsl/gslloader-wav.c
new file mode 100644
index 0000000..d0a1c1e
--- /dev/null
+++ b/flow/gsl/gslloader-wav.c
@@ -0,0 +1,442 @@
+/* GSL - Generic Sound Layer
+ * Copyright (C) 1998, 2000, 2001 Tim Janik
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+#include "gslloader.h"
+
+#include "gsldatahandle.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+
+
+/* load routine for the RIFF/WAVE sample format
+ * ref.: C't 01/1993 pp. 213
+ */
+
+typedef guint32 DWord;
+typedef guint16 Word;
+#define DWORD_FROM_BE GUINT32_FROM_BE
+#define DWORD_FROM_LE GUINT32_FROM_LE
+#define WORD_FROM_LE GUINT16_FROM_LE
+
+
+/* --- debugging and errors --- */
+#define WAV_DEBUG GSL_DEBUG_FUNCTION (GSL_MSG_DATA_HANDLE, "WAV")
+#define WAV_MSG GSL_MESSAGE_FUNCTION (GSL_MSG_DATA_HANDLE, "WAV")
+
+
+/* --- functions --- */
+typedef struct
+{
+ DWord main_chunk; /* 'RIFF', big endian as int */
+ DWord file_length; /* file length */
+ DWord chunk_type; /* 'WAVE', big endian as int */
+} WavHeader;
+static GslErrorType
+wav_read_header (gint fd,
+ WavHeader *header)
+{
+ guint n_bytes;
+
+ memset (header, 0, sizeof (*header));
+
+ /* read header contents */
+ n_bytes = 4 + 4 + 4;
+ g_assert (n_bytes == sizeof (*header));
+ if (read (fd, header, n_bytes) != n_bytes)
+ {
+ WAV_DEBUG ("failed to read WavHeader");
+ return GSL_ERROR_IO;
+ }
+
+ /* endianess corrections */
+ header->main_chunk = DWORD_FROM_BE (header->main_chunk);
+ header->file_length = DWORD_FROM_LE (header->file_length);
+ header->chunk_type = DWORD_FROM_BE (header->chunk_type);
+
+ /* validation */
+ if (header->main_chunk != ('R' << 24 | 'I' << 16 | 'F' << 8 | 'F'))
+ {
+ WAV_DEBUG ("unmatched token 'RIFF'");
+ return GSL_ERROR_FORMAT_INVALID;
+ }
+ if (header->file_length < 40)
+ {
+ WAV_DEBUG ("file length (%u) too small", header->file_length);
+ return GSL_ERROR_FORMAT_INVALID;
+ }
+ if (header->chunk_type != ('W' << 24 | 'A' << 16 | 'V' << 8 | 'E'))
+ {
+ WAV_DEBUG ("unmatched token 'WAVE'");
+ return GSL_ERROR_FORMAT_INVALID;
+ }
+
+ return GSL_ERROR_NONE;
+}
+
+typedef struct
+{
+ DWord sub_chunk; /* 'fmt ', big endian as int */
+ DWord length; /* sub chunk length, must be 16 */
+ Word format; /* 1 for PCM */
+ Word n_channels; /* 1 = Mono, 2 = Stereo */
+ DWord sample_freq;
+ DWord byte_per_second;
+ Word byte_per_sample; /* 1 = 8bit, 2 = 16bit */
+ Word bit_per_sample; /* 8, 12 or 16 */
+} FmtHeader;
+static GslErrorType
+wav_read_fmt_header (gint fd,
+ FmtHeader *header)
+{
+ guint n_bytes;
+
+ memset (header, 0, sizeof (*header));
+
+ /* read header contents */
+ n_bytes = 4 + 4 + 2 + 2 + 4 + 4 + 2 + 2;
+ g_assert (n_bytes == sizeof (*header));
+ if (read (fd, header, n_bytes) != n_bytes)
+ {
+ WAV_DEBUG ("failed to read FmtHeader");
+ return GSL_ERROR_IO;
+ }
+
+ /* endianess corrections */
+ header->sub_chunk = DWORD_FROM_BE (header->sub_chunk);
+ header->length = DWORD_FROM_LE (header->length);
+ header->format = WORD_FROM_LE (header->format);
+ header->n_channels = WORD_FROM_LE (header->n_channels);
+ header->sample_freq = DWORD_FROM_LE (header->sample_freq);
+ header->byte_per_second = DWORD_FROM_LE (header->byte_per_second);
+ header->byte_per_sample = WORD_FROM_LE (header->byte_per_sample);
+ header->bit_per_sample = WORD_FROM_LE (header->bit_per_sample);
+
+ /* validation */
+ if (header->sub_chunk != ('f' << 24 | 'm' << 16 | 't' << 8 | ' '))
+ {
+ WAV_DEBUG ("unmatched token 'fmt '");
+ return GSL_ERROR_FORMAT_UNKNOWN;
+ }
+ if (header->format != 1 /* PCM */ ||
+ header->n_channels > 2 || header->n_channels < 1)
+ {
+ WAV_DEBUG ("invalid format (%u) or n_channels (%u)", header->format, header->n_channels);
+ return GSL_ERROR_FORMAT_UNKNOWN;
+ }
+ if (header->length < 16)
+ {
+ WAV_DEBUG ("WAVE header too short (%u)", header->length);
+ return GSL_ERROR_FORMAT_INVALID;
+ }
+ if (header->sample_freq < 1378 || header->sample_freq > 96000)
+ {
+ WAV_DEBUG ("invalid sample_freq (%u)", header->sample_freq);
+ return GSL_ERROR_FORMAT_UNKNOWN;
+ }
+ if (header->byte_per_sample < 1 || header->byte_per_sample > 4 ||
+ (header->bit_per_sample != 8 && header->bit_per_sample != 12 && header->bit_per_sample != 16))
+ {
+ WAV_DEBUG ("invalid byte_per_sample (%u) or bit_per_sample (%u)", header->byte_per_sample, header->bit_per_sample);
+ return GSL_ERROR_FORMAT_UNKNOWN;
+ }
+ if (header->byte_per_second != header->sample_freq * header->byte_per_sample ||
+ header->byte_per_sample != (header->bit_per_sample + 7) / 8 * header->n_channels)
+ {
+ WAV_DEBUG ("invalid byte_per_second (%u!=%u) or byte_per_sample (%u!=%u)",
+ header->byte_per_second, header->sample_freq * header->byte_per_sample,
+ header->byte_per_sample, (header->bit_per_sample + 7) / 8 * header->n_channels);
+ return GSL_ERROR_FORMAT_INVALID;
+ }
+ if (header->length > 16)
+ {
+ guint n;
+
+ WAV_DEBUG ("WAVE header too long (%u)", header->length);
+
+ n = header->length - 16;
+ while (n)
+ {
+ guint8 junk[64];
+ guint l = MIN (n, 64);
+
+ l = read (fd, junk, l);
+ if (l < 1 || l > n)
+ {
+ WAV_DEBUG ("failed to read FmtHeader");
+ return GSL_ERROR_IO;
+ }
+ n -= l;
+ }
+
+ WAV_MSG (GSL_ERROR_CONTENT_GLITCH, "skipping %u bytes of junk in WAVE header", header->length - 16);
+ }
+
+ return GSL_ERROR_NONE;
+}
+
+typedef struct
+{
+ DWord data_chunk; /* 'data', big endian as int */
+ DWord data_length;
+} DataHeader;
+static GslErrorType
+wav_read_data_header (gint fd,
+ DataHeader *header,
+ guint byte_alignment)
+{
+ guint n_bytes;
+
+ memset (header, 0, sizeof (*header));
+
+ /* read header contents */
+ n_bytes = 4 + 4;
+ g_assert (n_bytes == sizeof (*header));
+ if (read (fd, header, n_bytes) != n_bytes)
+ {
+ WAV_DEBUG ("failed to read DataHeader");
+ return GSL_ERROR_IO;
+ }
+
+ /* endianess corrections */
+ header->data_chunk = DWORD_FROM_BE (header->data_chunk);
+ header->data_length = DWORD_FROM_LE (header->data_length);
+
+ /* validation */
+ if (header->data_chunk != ('d' << 24 | 'a' << 16 | 't' << 8 | 'a'))
+ {
+ guchar chunk[5];
+ gchar *esc;
+
+ chunk[0] = header->data_chunk >> 24;
+ chunk[1] = (header->data_chunk >> 16) & 0xff;
+ chunk[2] = (header->data_chunk >> 8) & 0xff;
+ chunk[3] = header->data_chunk & 0xff;
+ chunk[4] = 0;
+ esc = g_strescape (chunk, NULL);
+
+ /* skip chunk and retry */
+ WAV_DEBUG ("ignoring sub-chunk '%s'", esc);
+ g_free (esc);
+ if (lseek (fd, header->data_length, SEEK_CUR) < 0)
+ {
+ WAV_DEBUG ("failed to seek while skipping sub-chunk");
+ return GSL_ERROR_IO;
+ }
+ return wav_read_data_header (fd, header, byte_alignment);
+ }
+ if (header->data_length < 1 || header->data_length % byte_alignment != 0)
+ {
+ WAV_DEBUG ("invalid data length (%u) or alignment (%u)",
+ header->data_length, header->data_length % byte_alignment);
+ return GSL_ERROR_FORMAT_INVALID;
+ }
+
+ return GSL_ERROR_NONE;
+}
+
+typedef struct
+{
+ GslWaveFileInfo wfi;
+ gint fd;
+} FileInfo;
+
+static GslWaveFileInfo*
+wav_load_file_info (gpointer data,
+ const gchar *file_name,
+ GslErrorType *error_p)
+{
+ WavHeader wav_header;
+ FileInfo *fi;
+ gint fd;
+
+ fd = open (file_name, O_RDONLY);
+ if (fd < 0)
+ {
+ *error_p = GSL_ERROR_OPEN_FAILED;
+ return NULL;
+ }
+
+ *error_p = wav_read_header (fd, &wav_header);
+ if (*error_p)
+ {
+ close (fd);
+ return NULL;
+ }
+
+ fi = gsl_new_struct0 (FileInfo, 1);
+ fi->wfi.n_waves = 1;
+ fi->wfi.waves = g_malloc0 (sizeof (fi->wfi.waves[0]) * fi->wfi.n_waves);
+ fi->wfi.waves[0].name = g_strdup (file_name);
+ fi->fd = fd;
+
+ return &fi->wfi;
+}
+
+static void
+wav_free_file_info (gpointer data,
+ GslWaveFileInfo *file_info)
+{
+ FileInfo *fi = (FileInfo*) file_info;
+
+ g_free (fi->wfi.waves[0].name);
+ g_free (fi->wfi.waves);
+ close (fi->fd);
+ gsl_delete_struct (FileInfo, fi);
+}
+
+typedef struct
+{
+ GslWaveDsc wdsc;
+ GslLong data_offset;
+ GslLong n_values;
+ GslWaveFormatType format;
+} WaveDsc;
+
+static GslWaveDsc*
+wav_load_wave_dsc (gpointer data,
+ GslWaveFileInfo *file_info,
+ guint nth_wave,
+ GslErrorType *error_p)
+{
+ FileInfo *fi = (FileInfo*) file_info;
+ DataHeader data_header;
+ FmtHeader fmt_header;
+ WaveDsc *dsc;
+ GslWaveFormatType format;
+ GslLong data_offset, data_width;
+
+ g_return_val_if_fail (nth_wave == 0, NULL);
+
+ if (lseek (fi->fd, sizeof (WavHeader), SEEK_SET) != sizeof (WavHeader))
+ {
+ WAV_DEBUG ("failed to seek to end of WavHeader");
+ *error_p = GSL_ERROR_IO;
+ return NULL;
+ }
+
+ *error_p = wav_read_fmt_header (fi->fd, &fmt_header);
+ if (*error_p)
+ return NULL;
+
+ data_width = (fmt_header.bit_per_sample + 7) / 8;
+ *error_p = wav_read_data_header (fi->fd, &data_header, data_width * fmt_header.n_channels);
+ data_offset = lseek (fi->fd, 0, SEEK_CUR);
+ if (data_offset < sizeof (WavHeader) && !*error_p)
+ {
+ WAV_DEBUG ("failed to seek to start of data");
+ *error_p = GSL_ERROR_IO;
+ }
+ if (*error_p)
+ return NULL;
+
+ switch (fmt_header.bit_per_sample)
+ {
+ case 8: format = GSL_WAVE_FORMAT_UNSIGNED_8; break;
+ case 12: format = GSL_WAVE_FORMAT_SIGNED_12; break;
+ case 16: format = GSL_WAVE_FORMAT_SIGNED_16; break;
+ default:
+ WAV_DEBUG ("unrecognized sample width (%u)", fmt_header.bit_per_sample);
+ *error_p = GSL_ERROR_FORMAT_UNKNOWN;
+ return NULL;
+ }
+ if (0)
+ WAV_DEBUG ("n_channels: %d sample_freq: %d bit_width: %u",
+ fmt_header.n_channels, fmt_header.sample_freq, fmt_header.bit_per_sample);
+
+ dsc = gsl_new_struct0 (WaveDsc, 1);
+ dsc->wdsc.name = g_strdup (fi->wfi.waves[0].name);
+ dsc->wdsc.n_channels = fmt_header.n_channels;
+ dsc->wdsc.n_chunks = 1;
+ dsc->wdsc.chunks = g_malloc0 (sizeof (dsc->wdsc.chunks[0]) * dsc->wdsc.n_chunks);
+ dsc->wdsc.chunks[0].mix_freq = fmt_header.sample_freq;
+ dsc->wdsc.chunks[0].osc_freq = 440.0; /* FIXME */
+ dsc->data_offset = data_offset;
+ dsc->n_values = data_header.data_length / data_width;
+ dsc->format = format;
+
+ return &dsc->wdsc;
+}
+
+static void
+wav_free_wave_dsc (gpointer data,
+ GslWaveDsc *wave_dsc)
+{
+ WaveDsc *dsc = (WaveDsc*) wave_dsc;
+
+ g_free (dsc->wdsc.name);
+ g_free (dsc->wdsc.chunks);
+ gsl_delete_struct (WaveDsc, dsc);
+}
+
+static GslDataHandle*
+wav_create_chunk_handle (gpointer data,
+ GslWaveDsc *wave_dsc,
+ guint nth_chunk,
+ GslErrorType *error_p)
+{
+ WaveDsc *dsc = (WaveDsc*) wave_dsc;
+ GslDataHandle *dhandle;
+
+ g_return_val_if_fail (nth_chunk == 0, NULL);
+
+ dhandle = gsl_wave_handle_new (dsc->wdsc.file_info->file_name,
+ dsc->wdsc.n_channels,
+ dsc->format, G_LITTLE_ENDIAN,
+ dsc->data_offset, dsc->n_values);
+ return dhandle;
+}
+
+void
+_gsl_init_loader_wav (void)
+{
+ static const gchar *file_exts[] = { "wav", NULL, };
+ static const gchar *mime_types[] = { "audio/wav", "audio/x-wav", NULL, };
+ static const gchar *magics[] = {
+ (
+ "0 string RIFF\n"
+ "8 string WAVE\n"
+ "12 string fmt\\s\n" /* expect "fmt " */
+ "16 lelong >15\n" /* expect valid sub chunk length */
+ "20 leshort =1\n" /* expect PCM format */
+ ),
+ NULL,
+ };
+ static GslLoader loader = {
+ "RIFF, WAVE audio, PCM",
+ file_exts,
+ mime_types,
+ magics,
+ 0, /* priority */
+ NULL,
+ wav_load_file_info,
+ wav_free_file_info,
+ wav_load_wave_dsc,
+ wav_free_wave_dsc,
+ wav_create_chunk_handle,
+ };
+ static gboolean initialized = FALSE;
+
+ g_assert (initialized == FALSE);
+ initialized = TRUE;
+
+ gsl_loader_register (&loader);
+}
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