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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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Add a parser for metadata
Original commit message from CVS: Add a parser for metadata (demux_metadata): Given the buffer containing the metadata, look through it and get the info out of it. (wav_new_chunk_callback): Change the if statement to a switch statement. Handle GST_RIFF_TAG_LIST by changing what the type of list it is and parsing out metadata if it is "INFO".
This commit is contained in:
Iain Holmes
parent
ec91719c99
commit
919d3f2f7c
2 changed files with 219 additions and 64 deletions
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@ -51,6 +51,7 @@ static void gst_wavparse_chain (GstPad *pad, GstData *_data);
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static const GstEventMask*
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gst_wavparse_get_event_masks (GstPad *pad);
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static gboolean gst_wavparse_srcpad_event (GstPad *pad, GstEvent *event);
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static void gst_wavparse_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
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/* elementfactory information */
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static GstElementDetails gst_wavparse_details = {
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@ -136,8 +137,8 @@ enum {
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};
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enum {
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ARG_0,
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/* FILL ME */
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PROP_0,
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PROP_METADATA
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};
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static GstElementClass *parent_class = NULL;
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@ -168,12 +169,21 @@ static void
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gst_wavparse_class_init (GstWavParseClass *klass)
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{
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GstElementClass *gstelement_class;
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GObjectClass *object_class;
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gstelement_class = (GstElementClass*) klass;
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object_class = (GObjectClass *) klass;
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parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
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object_class->get_property = gst_wavparse_get_property;
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gstelement_class->change_state = gst_wavparse_change_state;
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g_object_class_install_property (object_class, PROP_METADATA,
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g_param_spec_boxed ("metadata",
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"Metadata", "Metadata",
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GST_TYPE_CAPS,
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G_PARAM_READABLE));
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}
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static void
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@ -213,6 +223,26 @@ gst_wavparse_init (GstWavParse *wavparse)
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wavparse->need_discont = FALSE;
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}
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static void
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gst_wavparse_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GstWavParse *wavparse;
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wavparse = GST_WAVPARSE (object);
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switch (prop_id) {
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case PROP_METADATA:
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g_value_set_boxed (value, wavparse->metadata);
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break;
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default:
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break;
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}
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}
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static GstCaps*
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wav_type_find (GstByteStream *bs, gpointer private)
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{
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@ -237,90 +267,212 @@ wav_type_find (GstByteStream *bs, gpointer private)
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return new;
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}
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static void
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demux_metadata (GstWavParse *wavparse,
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const char *data,
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int len)
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{
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gst_riff_chunk *temp_chunk, chunk;
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char *name, *type;
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GstPropsEntry *entry;
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GstProps *props;
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props = gst_props_empty_new ();
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while (len > 0) {
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temp_chunk = (gst_riff_chunk *) data;
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chunk.id = GUINT32_FROM_LE (temp_chunk->id);
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chunk.size = GUINT32_FROM_LE (temp_chunk->size);
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/* move our pointer on past the header */
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len -= sizeof (gst_riff_chunk);
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data += sizeof (gst_riff_chunk);
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if (chunk.size == 0) {
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continue;
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}
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name = g_strndup (data, chunk.size);
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/* move our pointer on past the data ... on an even boundary */
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len -= ((chunk.size + 1) & ~1);
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data += ((chunk.size + 1) & ~1);
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/* We now have an info string in 'name' of type chunk.id
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- find type */
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switch (chunk.id) {
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case GST_RIFF_INFO_IARL:
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type = "Location";
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break;
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case GST_RIFF_INFO_IART:
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type = "Artist";
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break;
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case GST_RIFF_INFO_ICMS:
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type = "Commissioner";
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break;
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case GST_RIFF_INFO_ICMT:
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type = "Comment";
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break;
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case GST_RIFF_INFO_ICOP:
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type = "Copyright";
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break;
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case GST_RIFF_INFO_ICRD:
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type = "Creation Date";
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break;
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case GST_RIFF_INFO_IENG:
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type = "Engineer";
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break;
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case GST_RIFF_INFO_IGNR:
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type = "Genre";
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break;
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case GST_RIFF_INFO_IKEY:
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type = "Keywords";
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break;
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case GST_RIFF_INFO_INAM:
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type = "Title"; /* name */
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break;
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case GST_RIFF_INFO_IPRD:
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type = "Product";
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break;
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case GST_RIFF_INFO_ISBJ:
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type = "Subject";
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break;
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case GST_RIFF_INFO_ISFT:
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type = "Software";
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break;
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case GST_RIFF_INFO_ITCH:
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type = "Technician";
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break;
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default:
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type = NULL;
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break;
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}
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if (type) {
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entry = gst_props_entry_new (type, GST_PROPS_STRING (name));
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gst_props_add_entry (props, entry);
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}
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g_free (name);
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}
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gst_caps_replace_sink (&wavparse->metadata,
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gst_caps_new ("wav_metadata",
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"application/x-gst-metadata",
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props));
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g_object_notify (G_OBJECT (wavparse), "metadata");
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}
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static void wav_new_chunk_callback(GstRiffChunk *chunk, gpointer data)
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{
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GstWavParse *wavparse;
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GstWavParseFormat *format;
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GstCaps *caps = NULL;
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wavparse = GST_WAVPARSE (data);
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GST_DEBUG("new tag " GST_FOURCC_FORMAT "\n", GST_FOURCC_ARGS(chunk->id));
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if(chunk->id == GST_RIFF_TAG_fmt){
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GstWavParseFormat *format;
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GstCaps *caps = NULL;
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switch (chunk->id) {
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case GST_RIFF_TAG_fmt:
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/* we can gather format information now */
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format = (GstWavParseFormat *)((guchar *) GST_BUFFER_DATA (wavparse->buf) + chunk->offset);
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wavparse->bps = GUINT16_FROM_LE(format->wBlockAlign);
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wavparse->rate = GUINT32_FROM_LE(format->dwSamplesPerSec);
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wavparse->channels = GUINT16_FROM_LE(format->wChannels);
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wavparse->width = GUINT16_FROM_LE(format->wBitsPerSample);
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wavparse->format = GINT16_FROM_LE(format->wFormatTag);
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/* set the caps on the src pad */
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/* FIXME: handle all of the other formats as well */
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switch (wavparse->format)
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{
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case GST_RIFF_WAVE_FORMAT_ALAW:
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case GST_RIFF_WAVE_FORMAT_MULAW: {
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gchar *mime = (wavparse->format == GST_RIFF_WAVE_FORMAT_ALAW) ?
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"audio/x-alaw" : "audio/x-mulaw";
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if (!(wavparse->width == 8)) {
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g_warning("Ignoring invalid width %d",
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wavparse->width);
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return;
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}
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caps = GST_CAPS_NEW (
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"parsewav_src",
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mime,
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"rate", GST_PROPS_INT (wavparse->rate),
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"channels", GST_PROPS_INT (wavparse->channels)
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);
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}
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break;
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case GST_RIFF_WAVE_FORMAT_PCM:
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caps = GST_CAPS_NEW (
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"parsewav_src",
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"audio/x-raw-int",
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"endianness", GST_PROPS_INT (G_LITTLE_ENDIAN),
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"signed", GST_PROPS_BOOLEAN ((wavparse->width > 8) ? TRUE : FALSE),
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"width", GST_PROPS_INT (wavparse->width),
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"depth", GST_PROPS_INT (wavparse->width),
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"rate", GST_PROPS_INT (wavparse->rate),
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"channels", GST_PROPS_INT (wavparse->channels)
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);
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break;
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case GST_RIFF_WAVE_FORMAT_MPEGL12:
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case GST_RIFF_WAVE_FORMAT_MPEGL3: {
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gint layer = (wavparse->format == GST_RIFF_WAVE_FORMAT_MPEGL12) ? 2 : 3;
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caps = GST_CAPS_NEW (
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"parsewav_src",
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"audio/mpeg",
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"layer", GST_PROPS_INT (layer),
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"rate", GST_PROPS_INT (wavparse->rate),
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"channels", GST_PROPS_INT (wavparse->channels)
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);
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}
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break;
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default:
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gst_element_error (GST_ELEMENT (wavparse), "wavparse: format %d not handled", wavparse->format);
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switch (wavparse->format) {
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case GST_RIFF_WAVE_FORMAT_ALAW:
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case GST_RIFF_WAVE_FORMAT_MULAW: {
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gchar *mime = (wavparse->format == GST_RIFF_WAVE_FORMAT_ALAW) ?
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"audio/x-alaw" : "audio/x-mulaw";
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if (!(wavparse->width == 8)) {
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g_warning("Ignoring invalid width %d",
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wavparse->width);
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return;
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}
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caps = GST_CAPS_NEW (
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"parsewav_src",
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mime,
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"rate", GST_PROPS_INT (wavparse->rate),
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"channels", GST_PROPS_INT (wavparse->channels)
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);
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}
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break;
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case GST_RIFF_WAVE_FORMAT_PCM:
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caps = GST_CAPS_NEW (
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"parsewav_src",
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"audio/x-raw-int",
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"endianness", GST_PROPS_INT (G_LITTLE_ENDIAN),
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"signed", GST_PROPS_BOOLEAN ((wavparse->width > 8) ? TRUE : FALSE),
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"width", GST_PROPS_INT (wavparse->width),
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"depth", GST_PROPS_INT (wavparse->width),
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"rate", GST_PROPS_INT (wavparse->rate),
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"channels", GST_PROPS_INT (wavparse->channels)
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);
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break;
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case GST_RIFF_WAVE_FORMAT_MPEGL12:
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case GST_RIFF_WAVE_FORMAT_MPEGL3: {
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gint layer = (wavparse->format == GST_RIFF_WAVE_FORMAT_MPEGL12) ? 2 : 3;
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caps = GST_CAPS_NEW (
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"parsewav_src",
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"audio/mpeg",
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"layer", GST_PROPS_INT (layer),
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"rate", GST_PROPS_INT (wavparse->rate),
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"channels", GST_PROPS_INT (wavparse->channels)
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);
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}
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break;
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default:
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gst_element_error (GST_ELEMENT (wavparse), "wavparse: format %d not handled", wavparse->format);
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return;
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}
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if (gst_pad_try_set_caps (wavparse->srcpad, caps) <= 0) {
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gst_element_error (GST_ELEMENT (wavparse), "Could not set caps");
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return;
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}
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GST_DEBUG ("frequency %d, channels %d",
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wavparse->rate, wavparse->channels);
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/* we're now looking for the data chunk */
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wavparse->state = GST_WAVPARSE_CHUNK_DATA;
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}
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break;
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case GST_RIFF_TAG_LIST:
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if (strncmp (chunk->data, "INFO", 4) == 0) {
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/* We got metadata */
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demux_metadata (wavparse, chunk->data + 4, chunk->size - 4);
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}
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break;
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default:
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break;
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}
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}
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static void
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@ -405,11 +557,11 @@ gst_wavparse_chain (GstPad *pad, GstData *_data)
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if (wavparse->state == GST_WAVPARSE_OTHER) {
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GST_DEBUG ("we're in unknown territory here, not passing on");
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gst_buffer_unref(buf);
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return;
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}
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/* here we deal with parsing out the primary state */
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/* these are sequenced such that in the normal case each (RIFF/WAVE,
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fmt, data) will fire in sequence, as they should */
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@ -49,7 +49,7 @@ extern "C" {
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#define GST_WAVPARSE_CHUNK_DATA 2 /* searching for data */
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#define GST_WAVPARSE_DATA 3 /* in data region */
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#define GST_WAVPARSE_OTHER 4 /* in unknown region */
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typedef struct _GstWavParse GstWavParse;
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typedef struct _GstWavParseClass GstWavParseClass;
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@ -83,6 +83,8 @@ struct _GstWavParse {
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gboolean need_discont;
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GstBuffer *buf;
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GstCaps *metadata;
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};
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struct _GstWavParseClass {
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@ -101,7 +103,8 @@ struct _GstWavParseFormat {
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guint16 wBlockAlign;
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guint16 wBitsPerSample;
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};
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/**** from public Microsoft RIFF docs ******/
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#define GST_RIFF_WAVE_FORMAT_UNKNOWN (0x0000)
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#define GST_RIFF_WAVE_FORMAT_PCM (0x0001)
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