gstreamer/gst/wavenc/gstwavenc.c

/* -*- Mode: C; tab-width: 2; indent-tabs-mode: t; c-basic-offset: 2 -*- */
/* GStreamer
 * Copyright (C) <2002> Iain Holmes <iain@prettypeople.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library 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.
 * 
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <string.h>
#include <gstwavenc.h>
#include <riff.h>

static void gst_wavenc_base_init (gpointer g_class);
static void gst_wavenc_class_init (GstWavEncClass * klass);
static void gst_wavenc_init (GstWavEnc * wavenc);
static void gst_wavenc_chain (GstPad * pad, GstData * _data);

#define WAVE_FORMAT_PCM 0x0001

#define WRITE_U32(buf, x) *(buf) = (unsigned char) (x&0xff);\
*((buf)+1) = (unsigned char)((x>>8)&0xff);\
*((buf)+2) = (unsigned char)((x>>16)&0xff);\
*((buf)+3) = (unsigned char)((x>>24)&0xff);

#define WRITE_U16(buf, x) *(buf) = (unsigned char) (x&0xff);\
*((buf)+1) = (unsigned char)((x>>8)&0xff);

struct riff_struct
{
  guint8 id[4];                 /* RIFF */
  guint32 len;
  guint8 wav_id[4];             /* WAVE */
};

struct chunk_struct
{
  guint8 id[4];
  guint32 len;
};

struct common_struct
{
  guint16 wFormatTag;
  guint16 wChannels;
  guint32 dwSamplesPerSec;
  guint32 dwAvgBytesPerSec;
  guint16 wBlockAlign;
  guint16 wBitsPerSample;       /* Only for PCM */
};

struct wave_header
{
  struct riff_struct riff;
  struct chunk_struct format;
  struct common_struct common;
  struct chunk_struct data;
};

static GstElementDetails gst_wavenc_details =
GST_ELEMENT_DETAILS ("WAV encoder",
    "Codec/Encoder/Audio",
    "Encode raw audio into WAV",
    "Iain Holmes <iain@prettypeople.org>");

static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("audio/x-raw-int, "
        "rate = (int) [ 1, MAX ], "
        "channels = (int) [ 1, MAX ], "
        "endianness = (int) LITTLE_ENDIAN, "
        "width = (int) { 8, 16 }, "
        "depth = (int) { 8, 16 }, " "signed = (boolean) true")
    );

static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("audio/x-wav")
    );

enum
{
  PROP_0,
};

static GstElementClass *parent_class = NULL;

static GType
gst_wavenc_get_type (void)
{
  static GType type = 0;

  if (type == 0) {
    static const GTypeInfo info = {
      sizeof (GstWavEncClass),
      gst_wavenc_base_init,
      NULL,
      (GClassInitFunc) gst_wavenc_class_init,
      NULL,
      NULL,
      sizeof (GstWavEnc),
      0,
      (GInstanceInitFunc) gst_wavenc_init
    };

    type = g_type_register_static (GST_TYPE_ELEMENT, "GstWavEnc", &info, 0);
  }

  return type;
}

static GstElementStateReturn
gst_wavenc_change_state (GstElement * element)
{
  GstWavEnc *wavenc = GST_WAVENC (element);

  switch (GST_STATE_TRANSITION (element)) {
    case GST_STATE_PAUSED_TO_READY:
      wavenc->setup = FALSE;
      wavenc->flush_header = TRUE;
      break;
    default:
      break;
  }

  if (parent_class->change_state) {
    return parent_class->change_state (element);
  }

  return GST_STATE_SUCCESS;
}

static void
set_property (GObject * object,
    guint prop_id, const GValue * value, GParamSpec * pspec)
{
  GstWavEnc *enc;

  enc = GST_WAVENC (object);

  switch (prop_id) {
    default:
      break;
  }
}

static void
gst_wavenc_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);

  gst_element_class_set_details (element_class, &gst_wavenc_details);

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&src_factory));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&sink_factory));
}
static void
gst_wavenc_class_init (GstWavEncClass * klass)
{
  GstElementClass *element_class;
  GObjectClass *object_class;

  element_class = (GstElementClass *) klass;
  object_class = (GObjectClass *) klass;
  object_class->set_property = set_property;

  element_class->change_state = gst_wavenc_change_state;

  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
}

static gboolean
gst_wavenc_setup (GstWavEnc * wavenc)
{
  struct wave_header wave;
  gint size = 0x7fffffff;       /* Use a bogus size initially */

  wave.common.wChannels = wavenc->channels;
  wave.common.wBitsPerSample = wavenc->bits;
  wave.common.dwSamplesPerSec = wavenc->rate;

  memset (wavenc->header, 0, WAV_HEADER_LEN);

  /* Fill out our wav-header with some information */
  strncpy (wave.riff.id, "RIFF", 4);
  wave.riff.len = size - 8;
  strncpy (wave.riff.wav_id, "WAVE", 4);

  strncpy (wave.format.id, "fmt ", 4);
  wave.format.len = 16;

  wave.common.wFormatTag = WAVE_FORMAT_PCM;
  wave.common.dwAvgBytesPerSec =
      wave.common.wChannels * wave.common.dwSamplesPerSec *
      (wave.common.wBitsPerSample >> 3);
  wave.common.wBlockAlign =
      wave.common.wChannels * (wave.common.wBitsPerSample >> 3);

  strncpy (wave.data.id, "data", 4);
  wave.data.len = size - 44;

  strncpy (wavenc->header, wave.riff.id, 4);
  WRITE_U32 (wavenc->header + 4, wave.riff.len);
  strncpy (wavenc->header + 8, wave.riff.wav_id, 4);
  strncpy (wavenc->header + 12, wave.format.id, 4);
  WRITE_U32 (wavenc->header + 16, wave.format.len);
  WRITE_U16 (wavenc->header + 20, wave.common.wFormatTag);
  WRITE_U16 (wavenc->header + 22, wave.common.wChannels);
  WRITE_U32 (wavenc->header + 24, wave.common.dwSamplesPerSec);
  WRITE_U32 (wavenc->header + 28, wave.common.dwAvgBytesPerSec);
  WRITE_U16 (wavenc->header + 32, wave.common.wBlockAlign);
  WRITE_U16 (wavenc->header + 34, wave.common.wBitsPerSample);
  strncpy (wavenc->header + 36, wave.data.id, 4);
  WRITE_U32 (wavenc->header + 40, wave.data.len);

  wavenc->setup = TRUE;
  return TRUE;
}

static GstPadLinkReturn
gst_wavenc_sinkconnect (GstPad * pad, const GstCaps * caps)
{
  GstWavEnc *wavenc;
  GstStructure *structure;

  wavenc = GST_WAVENC (gst_pad_get_parent (pad));

  structure = gst_caps_get_structure (caps, 0);

  gst_structure_get_int (structure, "channels", &wavenc->channels);
  gst_structure_get_int (structure, "rate", &wavenc->rate);
  gst_structure_get_int (structure, "depth", &wavenc->bits);

  gst_wavenc_setup (wavenc);

  if (wavenc->setup) {
    return GST_PAD_LINK_OK;
  }

  return GST_PAD_LINK_REFUSED;
}

static void
gst_wavenc_stop_file (GstWavEnc * wavenc)
{
  GstEvent *event;
  GstBuffer *outbuf;

  event = gst_event_new_seek (GST_FORMAT_BYTES | GST_SEEK_METHOD_SET, 0);
  gst_pad_send_event (GST_PAD_PEER (wavenc->srcpad), event);

  outbuf = gst_buffer_new_and_alloc (WAV_HEADER_LEN);
  WRITE_U32 (wavenc->header + 4, wavenc->length);
  memcpy (GST_BUFFER_DATA (outbuf), wavenc->header, WAV_HEADER_LEN);

  gst_pad_push (wavenc->srcpad, GST_DATA (outbuf));
}

static void
gst_wavenc_init (GstWavEnc * wavenc)
{
  GstElementClass *klass = GST_ELEMENT_GET_CLASS (wavenc);

  wavenc->sinkpad =
      gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
          "sink"), "sink");
  gst_element_add_pad (GST_ELEMENT (wavenc), wavenc->sinkpad);
  gst_pad_set_chain_function (wavenc->sinkpad, gst_wavenc_chain);
  gst_pad_set_link_function (wavenc->sinkpad, gst_wavenc_sinkconnect);

  wavenc->srcpad =
      gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
          "src"), "src");
  gst_element_add_pad (GST_ELEMENT (wavenc), wavenc->srcpad);

  wavenc->setup = FALSE;
  wavenc->flush_header = TRUE;

  GST_FLAG_SET (wavenc, GST_ELEMENT_EVENT_AWARE);
}

struct _maps
{
  guint32 id;
  char *name;
}
maps[] =
{
  {
  GST_RIFF_INFO_IARL, "Location"}
  , {
  GST_RIFF_INFO_IART, "Artist"}
  , {
  GST_RIFF_INFO_ICMS, "Commissioner"}
  , {
  GST_RIFF_INFO_ICMT, "Comment"}
  , {
  GST_RIFF_INFO_ICOP, "Copyright"}
  , {
  GST_RIFF_INFO_ICRD, "Creation Date"}
  , {
  GST_RIFF_INFO_IENG, "Engineer"}
  , {
  GST_RIFF_INFO_IGNR, "Genre"}
  , {
  GST_RIFF_INFO_IKEY, "Keywords"}
  , {
  GST_RIFF_INFO_INAM, "Title"}
  ,                             /* Name */
  {
  GST_RIFF_INFO_IPRD, "Product"}
  , {
  GST_RIFF_INFO_ISBJ, "Subject"}
  , {
  GST_RIFF_INFO_ISFT, "Software"}
  , {
  GST_RIFF_INFO_ITCH, "Technician"}
  , {
  0, NULL}
};

#if 0
static guint32
get_id_from_name (const char *name)
{
  int i;

  for (i = 0; maps[i].name; i++) {
    if (strcasecmp (maps[i].name, name) == 0) {
      return maps[i].id;
    }
  }

  return 0;
}

static void
write_metadata (GstWavEnc * wavenc)
{
  GString *info_str;
  GList *props;
  int total = 4;
  gboolean need_to_write = FALSE;

  info_str = g_string_new ("LIST    INFO");

  for (props = wavenc->metadata->properties->properties; props;
      props = props->next) {
    GstPropsEntry *entry = props->data;
    const char *name;
    guint32 id;

    name = gst_props_entry_get_name (entry);
    id = get_id_from_name (name);
    if (id != 0) {
      const char *text;
      char *tmp;
      int len, req, i;

      need_to_write = TRUE;     /* We've got at least one entry */

      gst_props_entry_get_string (entry, &text);
      len = strlen (text) + 1;  /* The length in the file includes the \0 */

      tmp = g_strdup_printf (GST_FOURCC_FORMAT "%d%s", GST_FOURCC_ARGS (id),
          GUINT32_TO_LE (len), text);
      g_string_append (info_str, tmp);
      g_free (tmp);

      /* Check that we end on an even boundary */
      req = ((len + 8) + 1) & ~1;
      for (i = 0; i < req - len; i++) {
        g_string_append_printf (info_str, "%c", 0);
      }

      total += req;
    }
  }

  if (need_to_write) {
    GstBuffer *buf;

    /* Now we've got all the strings together, we can write our length in */
    info_str->str[4] = GUINT32_TO_LE (total);

    buf = gst_buffer_new ();
    gst_buffer_set_data (buf, info_str->str, info_str->len);

    gst_pad_push (wavenc->srcpad, GST_DATA (buf));
    g_string_free (info_str, FALSE);
  }
}

static void
write_cues (GstWavEnc * wavenc)
{
  GString *cue_string, *point_string;
  GstBuffer *buf;
  GList *cue_list, *c;
  int num_cues, total = 4;

  if (gst_props_get (wavenc->metadata->properties,
          "cues", &cue_list, NULL) == FALSE) {
    /* No cues, move along please, nothing to see here */
    return;
  }

  /* Space for 'cue ', chunk size and number of cuepoints */
  cue_string = g_string_new ("cue         ");
#define CUEPOINT_SIZE 24
  point_string = g_string_sized_new (CUEPOINT_SIZE);

  for (c = cue_list, num_cues = 0; c; c = c->next, num_cues++) {
    GstCaps *cue_caps = c->data;
    guint32 pos;

    gst_props_get (cue_caps->properties, "position", &pos, NULL);

    point_string->str[0] = GUINT32_TO_LE (num_cues + 1);
    point_string->str[4] = GUINT32_TO_LE (0);
    /* Fixme: There is probably a macro for this */
    point_string->str[8] = 'd';
    point_string->str[9] = 'a';
    point_string->str[10] = 't';
    point_string->str[11] = 'a';
    point_string->str[12] = GUINT32_TO_LE (0);
    point_string->str[16] = GUINT32_TO_LE (0);
    point_string->str[20] = GUINT32_TO_LE (pos);

    total += CUEPOINT_SIZE;
  }

  /* Set the length and chunk size */
  cue_string->str[4] = GUINT32_TO_LE (total);
  cue_string->str[8] = GUINT32_TO_LE (num_cues);
  /* Stick the cue points on the end */
  g_string_append (cue_string, point_string->str);
  g_string_free (point_string, TRUE);

  buf = gst_buffer_new ();
  gst_buffer_set_data (buf, cue_string->str, cue_string->len);

  gst_pad_push (wavenc->srcpad, GST_DATA (buf));
  g_string_free (cue_string, FALSE);
}

static void
write_labels (GstWavEnc * wavenc)
{
  GstBuffer *buf;
  GString *info_str;
  int total = 4;
  GList *caps;

  info_str = g_string_new ("LIST    adtl");
  if (gst_props_get (wavenc->metadata->properties, "ltxts", &caps, NULL)) {
    GList *p;
    int i;

    for (p = caps, i = 1; p; p = p->next, i++) {
      GstCaps *ltxt_caps = p->data;
      GString *ltxt;
      char *label = NULL;
      int len, req, j;

      gst_props_get (ltxt_caps->properties, "name", &label, NULL);
      len = strlen (label);

#define LTXT_SIZE 28
      ltxt = g_string_new ("ltxt                        ");
      ltxt->str[8] = GUINT32_TO_LE (i); /* Identifier */
      ltxt->str[12] = GUINT32_TO_LE (0);        /* Sample Length */
      ltxt->str[16] = GUINT32_TO_LE (0);        /* FIXME: Don't save the purpose yet */
      ltxt->str[20] = GUINT16_TO_LE (0);        /* Country */
      ltxt->str[22] = GUINT16_TO_LE (0);        /* Language */
      ltxt->str[24] = GUINT16_TO_LE (0);        /* Dialect */
      ltxt->str[26] = GUINT16_TO_LE (0);        /* Code Page */
      g_string_append (ltxt, label);
      g_free (label);

      len += LTXT_SIZE;

      ltxt->str[4] = GUINT32_TO_LE (len);

      /* Check that we end on an even boundary */
      req = ((len + 8) + 1) & ~1;
      for (j = 0; j < req - len; j++) {
        g_string_append_printf (ltxt, "%c", 0);
      }

      total += req;

      g_string_append (info_str, ltxt->str);
      g_string_free (ltxt, TRUE);
    }
  }

  if (gst_props_get (wavenc->metadata->properties, "labels", &caps, NULL)) {
    GList *p;
    int i;

    for (p = caps, i = 1; p; p = p->next, i++) {
      GstCaps *labl_caps = p->data;
      GString *labl;
      char *label = NULL;
      int len, req, j;

      gst_props_get (labl_caps->properties, "name", &label, NULL);
      len = strlen (label);

#define LABL_SIZE 4
      labl = g_string_new ("labl        ");
      labl->str[8] = GUINT32_TO_LE (i);
      g_string_append (labl, label);
      g_free (label);

      len += LABL_SIZE;

      labl->str[4] = GUINT32_TO_LE (len);

      /* Check our size */
      req = ((len + 8) + 1) & ~1;
      for (j = 0; j < req - len; j++) {
        g_string_append_printf (labl, "%c", 0);
      }

      total += req;

      g_string_append (info_str, labl->str);
      g_string_free (labl, TRUE);
    }
  }

  if (gst_props_get (wavenc->metadata->properties, "notes", &caps, NULL)) {
    GList *p;
    int i;

    for (p = caps, i = 1; p; p = p->next, i++) {
      GstCaps *note_caps = p->data;
      GString *note;
      char *label = NULL;
      int len, req, j;

      gst_props_get (note_caps->properties, "name", &label, NULL);
      len = strlen (label);

#define NOTE_SIZE 4
      note = g_string_new ("note        ");
      note->str[8] = GUINT32_TO_LE (i);
      g_string_append (note, label);
      g_free (label);

      len += NOTE_SIZE;

      note->str[4] = GUINT32_TO_LE (len);

      /* Size check */
      req = ((len + 8) + 1) & ~1;
      for (j = 0; j < req - len; j++) {
        g_string_append_printf (note, "%c", 0);
      }

      total += req;

      g_string_append (info_str, note->str);
      g_string_free (note, TRUE);
    }
  }

  info_str->str[4] = GUINT32_TO_LE (total);

  buf = gst_buffer_new ();
  gst_buffer_set_data (buf, info_str->str, info_str->len);

  gst_pad_push (wavenc->srcpad, GST_DATA (buf));
  g_string_free (info_str, FALSE);
}
#endif

static void
gst_wavenc_chain (GstPad * pad, GstData * _data)
{
  GstBuffer *buf = GST_BUFFER (_data);
  GstWavEnc *wavenc;

  wavenc = GST_WAVENC (gst_pad_get_parent (pad));

  if (!wavenc->setup) {
    gst_buffer_unref (buf);
    GST_ELEMENT_ERROR (wavenc, CORE, NEGOTIATION, (NULL),
        ("encoder not initialised (input is not audio?)"));
    return;
  }

  if (GST_IS_EVENT (buf)) {
    if (GST_EVENT_TYPE (buf) == GST_EVENT_EOS) {
      wavenc->pad_eos = TRUE;

#if 0
      /* Write our metadata if we have any */
      if (wavenc->metadata) {
        write_metadata (wavenc);
        write_cues (wavenc);
        write_labels (wavenc);
      }
#endif

      gst_wavenc_stop_file (wavenc);
      gst_pad_push (wavenc->srcpad, GST_DATA (gst_event_new (GST_EVENT_EOS)));
      gst_element_set_eos (GST_ELEMENT (wavenc));
    } else {
      gst_pad_event_default (wavenc->srcpad, GST_EVENT (buf));
    }
    return;
  }

  if (GST_PAD_IS_USABLE (wavenc->srcpad)) {
    if (wavenc->flush_header) {
      GstBuffer *outbuf;

      outbuf = gst_buffer_new_and_alloc (WAV_HEADER_LEN);
      memcpy (GST_BUFFER_DATA (outbuf), wavenc->header, WAV_HEADER_LEN);
      GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);

      gst_pad_push (wavenc->srcpad, GST_DATA (outbuf));
      wavenc->flush_header = FALSE;
    }

    wavenc->length += GST_BUFFER_SIZE (buf);
    gst_pad_push (wavenc->srcpad, GST_DATA (buf));
  }
}

static gboolean
plugin_init (GstPlugin * plugin)
{
  return gst_element_register (plugin, "wavenc", GST_RANK_NONE,
      GST_TYPE_WAVENC);
}

GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
    "wavenc",
    "Encode raw audio into WAV",
    plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)