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251 lines
7.1 KiB
C
251 lines
7.1 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <string.h>
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#include "gstspeexenc.h"
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extern GstPadTemplate *speexenc_src_template, *speexenc_sink_template;
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/* elementfactory information */
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GstElementDetails gst_speexenc_details = {
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"speex audio encoder",
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"Codec/Audio/Encoder",
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".speex",
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VERSION,
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"Wim Taymans <wim.taymans@chello.be>",
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"(C) 2000",
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};
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/* SpeexEnc signals and args */
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enum {
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FRAME_ENCODED,
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/* FILL ME */
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LAST_SIGNAL
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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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};
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static void gst_speexenc_class_init (GstSpeexEnc *klass);
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static void gst_speexenc_init (GstSpeexEnc *speexenc);
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static void gst_speexenc_chain (GstPad *pad,GstBuffer *buf);
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static GstPadLinkReturn gst_speexenc_sinkconnect (GstPad *pad, GstCaps *caps);
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static GstElementClass *parent_class = NULL;
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static guint gst_speexenc_signals[LAST_SIGNAL] = { 0 };
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GType
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gst_speexenc_get_type (void)
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{
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static GType speexenc_type = 0;
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if (!speexenc_type) {
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static const GTypeInfo speexenc_info = {
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sizeof (GstSpeexEncClass),
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NULL,
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NULL,
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(GClassInitFunc) gst_speexenc_class_init,
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NULL,
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NULL,
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sizeof (GstSpeexEnc),
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0,
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(GInstanceInitFunc) gst_speexenc_init,
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};
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speexenc_type = g_type_register_static (GST_TYPE_ELEMENT, "GstSpeexEnc", &speexenc_info, 0);
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}
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return speexenc_type;
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}
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static void
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gst_speexenc_class_init (GstSpeexEnc *klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass*) klass;
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gstelement_class = (GstElementClass*) klass;
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parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
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gst_speexenc_signals[FRAME_ENCODED] =
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g_signal_new ("frame_encoded", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstSpeexEncClass, frame_encoded), NULL, NULL,
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g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
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}
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static void
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gst_speexenc_init (GstSpeexEnc *speexenc)
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{
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/* create the sink and src pads */
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speexenc->sinkpad = gst_pad_new_from_template (speexenc_sink_template, "sink");
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gst_element_add_pad (GST_ELEMENT (speexenc), speexenc->sinkpad);
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gst_pad_set_chain_function (speexenc->sinkpad, gst_speexenc_chain);
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gst_pad_set_link_function (speexenc->sinkpad, gst_speexenc_sinkconnect);
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speexenc->srcpad = gst_pad_new_from_template (speexenc_src_template, "src");
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gst_element_add_pad (GST_ELEMENT (speexenc), speexenc->srcpad);
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speex_bits_init(&speexenc->bits);
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speexenc->mode = &speex_nb_mode;
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speexenc->bufsize = 0;
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speexenc->packet_count = 0;
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speexenc->n_packets = 20;
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}
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static GstPadLinkReturn
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gst_speexenc_sinkconnect (GstPad *pad, GstCaps *caps)
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{
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GstSpeexEnc *speexenc;
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speexenc = GST_SPEEXENC (gst_pad_get_parent (pad));
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if (!GST_CAPS_IS_FIXED (caps))
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return GST_PAD_LINK_DELAYED;
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gst_caps_get_int (caps, "rate", &speexenc->rate);
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if (gst_pad_try_set_caps (speexenc->srcpad, GST_CAPS_NEW (
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"speex_speex",
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"audio/x-speex",
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"rate", GST_PROPS_INT (speexenc->rate)
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)))
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{
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speex_init_header(&speexenc->header, speexenc->rate, 1, speexenc->mode);
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speexenc->header.frames_per_packet = speexenc->n_packets;
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speexenc->state = speex_encoder_init(speexenc->mode);
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speex_encoder_ctl(speexenc->state, SPEEX_GET_FRAME_SIZE, &speexenc->frame_size);
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return GST_PAD_LINK_OK;
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}
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return GST_PAD_LINK_REFUSED;
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}
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static void
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gst_speexenc_chain (GstPad *pad, GstBuffer *buf)
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{
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GstSpeexEnc *speexenc;
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GstBuffer *outbuf;
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gint16 *data;
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guint8 *header_data;
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gint size;
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float input[1000];
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gint frame_size;
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gint i;
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g_return_if_fail (pad != NULL);
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g_return_if_fail (GST_IS_PAD (pad));
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g_return_if_fail (buf != NULL);
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speexenc = GST_SPEEXENC (GST_OBJECT_PARENT (pad));
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if (!GST_PAD_CAPS (speexenc->srcpad)) {
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if (!gst_pad_try_set_caps (speexenc->srcpad,
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GST_CAPS_NEW (
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"speex_enc",
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"audio/x-speex",
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"rate", GST_PROPS_INT (speexenc->rate)
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)))
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{
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gst_element_error (GST_ELEMENT (speexenc), "could not negotiate");
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return;
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}
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}
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if (speexenc->packet_count == 0) {
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header_data = speex_header_to_packet(&speexenc->header, &size);
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outbuf = gst_buffer_new ();
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GST_BUFFER_DATA (outbuf) = header_data;
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GST_BUFFER_SIZE (outbuf) = size;
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gst_pad_push (speexenc->srcpad, outbuf);
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}
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data = (gint16 *) GST_BUFFER_DATA (buf);
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size = GST_BUFFER_SIZE (buf) / sizeof (gint16);
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frame_size = speexenc->frame_size;
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if (speexenc->bufsize && (speexenc->bufsize + size >= frame_size)) {
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memcpy (speexenc->buffer + speexenc->bufsize, data, (frame_size - speexenc->bufsize) * sizeof (gint16));
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for (i = 0; i < frame_size; i++)
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input[i] = speexenc->buffer[i];
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speex_encode (speexenc->state, input, &speexenc->bits);
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speexenc->packet_count++;
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if (speexenc->packet_count % speexenc->n_packets == 0) {
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GstBuffer *outbuf;
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outbuf = gst_buffer_new_and_alloc (frame_size * speexenc->n_packets);
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GST_BUFFER_SIZE (outbuf) = speex_bits_write(&speexenc->bits,
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GST_BUFFER_DATA (outbuf), GST_BUFFER_SIZE (outbuf));
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GST_BUFFER_TIMESTAMP (outbuf) = speexenc->next_ts;
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speex_bits_reset(&speexenc->bits);
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gst_pad_push (speexenc->srcpad, outbuf);
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speexenc->next_ts += frame_size * GST_SECOND / speexenc->rate;
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}
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size -= (speexenc->frame_size - speexenc->bufsize);
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data += (speexenc->frame_size - speexenc->bufsize);
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speexenc->bufsize = 0;
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}
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while (size >= frame_size) {
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for (i = 0; i < frame_size; i++)
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input[i] = data[i];
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speex_encode (speexenc->state, input, &speexenc->bits);
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speexenc->packet_count++;
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if (speexenc->packet_count % speexenc->n_packets == 0) {
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GstBuffer *outbuf;
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outbuf = gst_buffer_new_and_alloc (frame_size * speexenc->n_packets);
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GST_BUFFER_SIZE (outbuf) = speex_bits_write(&speexenc->bits,
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GST_BUFFER_DATA (outbuf), GST_BUFFER_SIZE (outbuf));
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GST_BUFFER_TIMESTAMP (outbuf) = speexenc->next_ts;
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speex_bits_reset(&speexenc->bits);
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gst_pad_push (speexenc->srcpad, outbuf);
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speexenc->next_ts += frame_size * GST_SECOND / speexenc->rate;
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}
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size -= frame_size;
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data += frame_size;
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}
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if (size) {
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memcpy (speexenc->buffer + speexenc->bufsize, data, size * sizeof (gint16));
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speexenc->bufsize += size;
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}
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gst_buffer_unref(buf);
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}
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