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Implement seeking on wav
Original commit message from CVS: Implement seeking on wav
This commit is contained in:
Wim Taymans
parent
9e147e261e
commit
ab71414650
1 changed files with 139 additions and 64 deletions
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@ -22,24 +22,28 @@
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#include <gstwavparse.h>
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static void gst_wavparse_class_init (GstWavParseClass *klass);
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static void gst_wavparse_init (GstWavParse *wavparse);
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static void gst_wavparse_class_init (GstWavParseClass *klass);
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static void gst_wavparse_init (GstWavParse *wavparse);
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static GstCaps* wav_type_find (GstBuffer *buf, gpointer private);
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static GstCaps* wav_type_find (GstBuffer *buf, gpointer private);
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static const GstFormat* gst_wavparse_get_formats (GstPad *pad);
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static const GstQueryType *
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gst_wavparse_get_query_types (GstPad *pad);
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static gboolean gst_wavparse_pad_query (GstPad *pad,
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GstQueryType type,
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GstFormat *format,
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gint64 *value);
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static gboolean gst_wavparse_pad_convert (GstPad *pad,
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GstFormat src_format,
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gint64 src_value,
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GstFormat *dest_format,
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gint64 *dest_value);
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static void gst_wavparse_chain (GstPad *pad, GstBuffer *buf);
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static gboolean gst_wavparse_pad_query (GstPad *pad,
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GstQueryType type,
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GstFormat *format,
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gint64 *value);
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static gboolean gst_wavparse_pad_convert (GstPad *pad,
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GstFormat src_format,
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gint64 src_value,
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GstFormat *dest_format,
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gint64 *dest_value);
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static void gst_wavparse_chain (GstPad *pad, GstBuffer *buf);
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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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/* elementfactory information */
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static GstElementDetails gst_wavparse_details = {
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@ -172,6 +176,8 @@ gst_wavparse_init (GstWavParse *wavparse)
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gst_pad_set_query_type_function (wavparse->srcpad,
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gst_wavparse_get_query_types);
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gst_pad_set_query_function (wavparse->srcpad, gst_wavparse_pad_query);
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gst_pad_set_event_function (wavparse->srcpad, gst_wavparse_srcpad_event);
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gst_pad_set_event_mask_function (wavparse->srcpad, gst_wavparse_get_event_masks);
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gst_pad_set_chain_function (wavparse->sinkpad, gst_wavparse_chain);
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@ -183,6 +189,8 @@ gst_wavparse_init (GstWavParse *wavparse)
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wavparse->riff_nextlikely = 0;
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wavparse->size = 0;
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wavparse->bps = 0;
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wavparse->offset = 0;
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wavparse->need_discont = FALSE;
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}
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static GstCaps*
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@ -196,37 +204,11 @@ wav_type_find (GstBuffer *buf, gpointer private)
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return gst_caps_new ("wav_type_find", "audio/x-wav", NULL);
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}
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/* set timestamp on outgoing buffer
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* returns TRUE if a timestamp was set
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*/
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static gboolean
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gst_wavparse_set_timestamp (GstWavParse *wavparse, GstBuffer *buf)
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{
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gboolean retval = FALSE;
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/* only do timestamps on linear audio */
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switch (wavparse->format)
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{
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case GST_RIFF_WAVE_FORMAT_PCM:
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GST_BUFFER_TIMESTAMP (buf) = wavparse->offset * GST_SECOND
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/ wavparse->rate;
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wavparse->offset += GST_BUFFER_SIZE (buf) * 8
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/ (wavparse->width * wavparse->channels);
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retval = TRUE;
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break;
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default:
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break;
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}
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return retval;
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}
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static void
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gst_wavparse_chain (GstPad *pad, GstBuffer *buf)
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{
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GstWavParse *wavparse;
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gboolean buffer_riffed = FALSE; /* so we don't parse twice */
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gchar *data;
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gulong size;
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g_return_if_fail (pad != NULL);
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@ -237,29 +219,55 @@ gst_wavparse_chain (GstPad *pad, GstBuffer *buf)
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wavparse = GST_WAVPARSE (gst_pad_get_parent (pad));
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GST_DEBUG (0, "gst_wavparse_chain: got buffer in '%s'",
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gst_object_get_name (GST_OBJECT (wavparse)));
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data = (guchar *) GST_BUFFER_DATA (buf);
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size = GST_BUFFER_SIZE (buf);
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/* walk through the states in priority order */
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/* we're in the data region */
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if (wavparse->state == GST_WAVPARSE_DATA) {
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GstFormat format;
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guint64 maxsize;
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/* we can't go beyond the max length */
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maxsize = wavparse->riff_nextlikely - GST_BUFFER_OFFSET (buf);
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/* if we're expected to see a new chunk in this buffer */
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if ((wavparse->riff_nextlikely - GST_BUFFER_OFFSET (buf))
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< GST_BUFFER_SIZE (buf)) {
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GST_BUFFER_SIZE (buf) = wavparse->riff_nextlikely
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- GST_BUFFER_OFFSET (buf);
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if (maxsize < size) {
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GstBuffer *newbuf;
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newbuf = gst_buffer_create_sub (buf, 0, maxsize);
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gst_buffer_unref (buf);
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buf = newbuf;
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size = maxsize;
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wavparse->state = GST_WAVPARSE_OTHER;
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/* I suppose we could signal an EOF at this point, but that may be
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premature. We've stopped data flow, that's the main thing. */
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}
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gst_wavparse_set_timestamp (wavparse, buf);
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if (GST_PAD_IS_USABLE (wavparse->srcpad)) {
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format = GST_FORMAT_TIME;
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gst_pad_convert (wavparse->srcpad,
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GST_FORMAT_BYTES,
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wavparse->offset,
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&format,
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&GST_BUFFER_TIMESTAMP (buf));
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if (GST_PAD_IS_USABLE (wavparse->srcpad))
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if (wavparse->need_discont) {
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gst_pad_push (wavparse->srcpad,
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GST_BUFFER (gst_event_new_discontinuous (FALSE,
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GST_FORMAT_TIME, GST_BUFFER_TIMESTAMP (buf),
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NULL)));
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wavparse->need_discont = FALSE;
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}
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gst_pad_push (wavparse->srcpad, buf);
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}
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else
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gst_buffer_unref (buf);
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wavparse->offset += size;
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return;
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}
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@ -396,6 +404,8 @@ gst_wavparse_chain (GstPad *pad, GstBuffer *buf)
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GST_DEBUG (0, "data begins at %ld", datachunk->offset);
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wavparse->datastart = datachunk->offset;
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/* at this point we can ACK that we have data */
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wavparse->state = GST_WAVPARSE_DATA;
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@ -403,22 +413,18 @@ gst_wavparse_chain (GstPad *pad, GstBuffer *buf)
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subsize = size - datachunk->offset;
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GST_DEBUG (0, "sending last %ld bytes along as audio", subsize);
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newbuf = gst_buffer_new ();
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GST_BUFFER_DATA (newbuf) = g_malloc (subsize);
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GST_BUFFER_SIZE (newbuf) = subsize;
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gst_wavparse_set_timestamp (wavparse, newbuf);
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memcpy (GST_BUFFER_DATA (newbuf),
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GST_BUFFER_DATA (buf) + datachunk->offset, subsize);
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newbuf = gst_buffer_create_sub (buf, datachunk->offset, subsize);
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gst_buffer_unref (buf);
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GST_BUFFER_TIMESTAMP (newbuf) = 0;
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if (GST_PAD_IS_USABLE (wavparse->srcpad))
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gst_pad_push (wavparse->srcpad, newbuf);
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else
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gst_buffer_unref (newbuf);
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wavparse->offset = subsize;
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/* now we're ready to go, the next buffer should start data */
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wavparse->state = GST_WAVPARSE_DATA;
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@ -456,22 +462,23 @@ gst_wavparse_pad_convert (GstPad *pad,
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GstWavParse *wavparse;
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wavparse = GST_WAVPARSE (gst_pad_get_parent (pad));
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/* FIXME default should be samples in this case IMO */
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if (*dest_format == GST_FORMAT_DEFAULT)
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*dest_format = GST_FORMAT_TIME;
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bytes_per_sample = wavparse->channels * wavparse->width / 8;
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if (bytes_per_sample == 0) {
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g_warning ("bytes_per_sample is 0, internal error\n");
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g_warning ("channels %d, width %d\n",
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wavparse->channels, wavparse->width);
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return FALSE;
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g_warning ("bytes_per_sample is 0, internal error\n");
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g_warning ("channels %d, width %d\n",
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wavparse->channels, wavparse->width);
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return FALSE;
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}
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byterate = (glong) (bytes_per_sample * wavparse->rate);
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if (byterate == 0) {
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g_warning ("byterate is 0, internal error\n");
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return FALSE;
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g_warning ("byterate is 0, internal error\n");
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return FALSE;
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}
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g_print ("DEBUG: bytes per sample: %d\n", bytes_per_sample);
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GST_DEBUG (0, "bytes per sample: %d\n", bytes_per_sample);
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switch (src_format) {
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case GST_FORMAT_BYTES:
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@ -494,9 +501,11 @@ gst_wavparse_pad_convert (GstPad *pad,
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if (*dest_format == GST_FORMAT_BYTES)
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*dest_value = src_value * byterate / GST_SECOND;
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else if (*dest_format == GST_FORMAT_UNITS)
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*dest_value = src_value * wavparse->rate /GST_SECOND;
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*dest_value = src_value * wavparse->rate / GST_SECOND;
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else
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return FALSE;
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*dest_value = *dest_value & ~(bytes_per_sample - 1);
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break;
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default:
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g_warning ("unhandled format for wavparse\n");
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@ -539,10 +548,76 @@ gst_wavparse_pad_query (GstPad *pad, GstQueryType type,
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g_warning ("Could not query sink pad's peer\n");
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return FALSE;
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}
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g_print ("DEBUG: pad_query done, value %" G_GINT64_FORMAT "\n", *value);
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GST_DEBUG (0, "pad_query done, value %" G_GINT64_FORMAT "\n", *value);
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return TRUE;
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}
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static const GstEventMask*
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gst_wavparse_get_event_masks (GstPad *pad)
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{
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static const GstEventMask gst_wavparse_src_event_masks[] = {
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{ GST_EVENT_SEEK, GST_SEEK_METHOD_SET |
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GST_SEEK_FLAG_FLUSH },
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{ 0, }
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};
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return gst_wavparse_src_event_masks;
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}
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static gboolean
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gst_wavparse_srcpad_event (GstPad *pad, GstEvent *event)
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{
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GstWavParse *wavparse = GST_WAVPARSE (GST_PAD_PARENT (pad));
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gboolean res = FALSE;
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GST_DEBUG(0, "event %d", GST_EVENT_TYPE (event));
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_SEEK:
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{
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gint64 byteoffset;
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GstFormat format;
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/* we can only seek when in the DATA state */
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if (wavparse->state != GST_WAVPARSE_DATA) {
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return FALSE;
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}
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format = GST_FORMAT_BYTES;
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/* bring format to bytes for the peer element,
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* FIXME be smarter here */
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res = gst_pad_convert (pad,
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GST_EVENT_SEEK_FORMAT (event),
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GST_EVENT_SEEK_OFFSET (event),
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&format,
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&byteoffset);
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if (res) {
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GstEvent *seek;
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/* seek to byteoffset + header length */
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seek = gst_event_new_seek (
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GST_FORMAT_BYTES |
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(GST_EVENT_SEEK_TYPE (event) & ~GST_SEEK_FORMAT_MASK),
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byteoffset + wavparse->datastart);
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res = gst_pad_send_event (GST_PAD_PEER (wavparse->sinkpad), seek);
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if (res) {
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/* ok, seek worked, update our state */
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wavparse->offset = byteoffset;
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wavparse->need_discont = TRUE;
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}
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}
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break;
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}
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default:
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break;
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}
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gst_event_unref (event);
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return res;
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}
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static gboolean
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plugin_init (GModule *module, GstPlugin *plugin)
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