mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-30 20:20:38 +00:00
325 lines
8.3 KiB
C
325 lines
8.3 KiB
C
/* GStreamer
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* Copyright (C) <2002> Iain Holmes <iain@prettypeople.org>
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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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*/
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#include <string.h>
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#include <gstwavenc.h>
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static void gst_wavenc_class_init (GstWavEncClass *klass);
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static void gst_wavenc_init (GstWavEnc *wavenc);
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static void gst_wavenc_chain (GstPad *pad, GstBuffer *buf);
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#define WAVE_FORMAT_PCM 0x0001
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#define WRITE_U32(buf, x) *(buf) = (unsigned char) (x&0xff);\
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*((buf)+1) = (unsigned char)((x>>8)&0xff);\
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*((buf)+2) = (unsigned char)((x>>16)&0xff);\
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*((buf)+3) = (unsigned char)((x>>24)&0xff);
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#define WRITE_U16(buf, x) *(buf) = (unsigned char) (x&0xff);\
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*((buf)+1) = (unsigned char)((x>>8)&0xff);
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struct riff_struct {
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guint8 id[4]; /* RIFF */
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guint32 len;
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guint8 wav_id[4]; /* WAVE */
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};
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struct chunk_struct {
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guint8 id[4];
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guint32 len;
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};
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struct common_struct {
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guint16 wFormatTag;
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guint16 wChannels;
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guint32 dwSamplesPerSec;
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guint32 dwAvgBytesPerSec;
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guint16 wBlockAlign;
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guint16 wBitsPerSample; /* Only for PCM */
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};
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struct wave_header {
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struct riff_struct riff;
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struct chunk_struct format;
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struct common_struct common;
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struct chunk_struct data;
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};
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static GstElementDetails gst_wavenc_details = {
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"WAV encoder",
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"Codec/Encoder",
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"LGPL",
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"Encode raw audio into WAV",
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VERSION,
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"Iain Holmes <iain@prettypeople.org>",
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"(C) 2002",
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};
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static GstPadTemplate *srctemplate, *sinktemplate;
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GST_PAD_TEMPLATE_FACTORY (sink_factory,
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"sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_CAPS_NEW (
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"wavenc_raw",
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"audio/raw",
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"format", GST_PROPS_STRING ("int"),
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"law", GST_PROPS_INT (0),
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"endianness", GST_PROPS_INT (G_LITTLE_ENDIAN),
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"signed", GST_PROPS_BOOLEAN (TRUE),
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"width", GST_PROPS_INT (16),
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"depth", GST_PROPS_INT (16),
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"rate", GST_PROPS_INT_RANGE (8000, 48000),
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"channels", GST_PROPS_INT_RANGE (1, 2)
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)
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)
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GST_PAD_TEMPLATE_FACTORY (src_factory,
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"src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_CAPS_NEW (
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"wavenc_wav",
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"audio/x-wav",
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NULL
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)
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)
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static GstElementClass *parent_class = NULL;
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static GType
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gst_wavenc_get_type (void)
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{
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static GType type = 0;
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if (type == 0) {
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static const GTypeInfo info = {
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sizeof (GstWavEncClass),
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NULL,
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NULL,
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(GClassInitFunc) gst_wavenc_class_init,
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NULL,
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NULL,
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sizeof (GstWavEnc),
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0,
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(GInstanceInitFunc) gst_wavenc_init
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};
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type = g_type_register_static (GST_TYPE_ELEMENT, "GstWavEnc", &info, 0);
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}
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return type;
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}
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static GstElementStateReturn
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gst_wavenc_change_state (GstElement *element)
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{
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GstWavEnc *wavenc = GST_WAVENC (element);
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switch (GST_STATE_TRANSITION (element)) {
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case GST_STATE_PAUSED_TO_READY:
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case GST_STATE_READY_TO_PAUSED:
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wavenc->setup = FALSE;
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wavenc->flush_header = TRUE;
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break;
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default:
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break;
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}
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if (parent_class->change_state) {
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return parent_class->change_state (element);
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}
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return GST_STATE_SUCCESS;
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}
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static void
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gst_wavenc_class_init (GstWavEncClass *klass)
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{
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GstElementClass *element_class;
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element_class = (GstElementClass *) klass;
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element_class->change_state = gst_wavenc_change_state;
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parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
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}
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static gboolean
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gst_wavenc_setup (GstWavEnc *wavenc)
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{
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struct wave_header wave;
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gint size = 0x7fffffff; /* Use a bogus size initially */
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wave.common.wChannels = wavenc->channels;
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wave.common.wBitsPerSample = wavenc->bits;
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wave.common.dwSamplesPerSec = wavenc->rate;
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memset (wavenc->header, 0, WAV_HEADER_LEN);
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/* Fill out our wav-header with some information */
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strncpy (wave.riff.id, "RIFF", 4);
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wave.riff.len = size - 8;
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strncpy (wave.riff.wav_id, "WAVE", 4);
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strncpy (wave.format.id, "fmt ", 4);
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wave.format.len = 16;
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wave.common.wFormatTag = WAVE_FORMAT_PCM;
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wave.common.dwAvgBytesPerSec = wave.common.wChannels * wave.common.dwSamplesPerSec * (wave.common.wBitsPerSample >> 3);
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wave.common.wBlockAlign = wave.common.wChannels * (wave.common.wBitsPerSample >> 3);
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strncpy (wave.data.id, "data", 4);
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wave.data.len = size - 44;
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strncpy (wavenc->header, wave.riff.id, 4);
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WRITE_U32 (wavenc->header + 4, wave.riff.len);
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strncpy (wavenc->header + 8, wave.riff.wav_id, 4);
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strncpy (wavenc->header + 12, wave.format.id, 4);
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WRITE_U32 (wavenc->header + 16, wave.format.len);
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WRITE_U16 (wavenc->header + 20, wave.common.wFormatTag);
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WRITE_U16 (wavenc->header + 22, wave.common.wChannels);
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WRITE_U32 (wavenc->header + 24, wave.common.dwSamplesPerSec);
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WRITE_U32 (wavenc->header + 28, wave.common.dwAvgBytesPerSec);
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WRITE_U16 (wavenc->header + 32, wave.common.wBlockAlign);
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WRITE_U16 (wavenc->header + 34, wave.common.wBitsPerSample);
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strncpy (wavenc->header + 36, wave.data.id, 4);
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WRITE_U32 (wavenc->header + 40, wave.data.len);
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wavenc->setup = TRUE;
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return TRUE;
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}
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static GstPadLinkReturn
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gst_wavenc_sinkconnect (GstPad *pad,
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GstCaps *caps)
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{
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GstWavEnc *wavenc;
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wavenc = GST_WAVENC (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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}
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gst_caps_get_int (caps, "channels", &wavenc->channels);
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gst_caps_get_int (caps, "rate", &wavenc->rate);
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gst_caps_get_int (caps, "depth", &wavenc->bits);
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gst_wavenc_setup (wavenc);
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if (wavenc->setup) {
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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_wavenc_init (GstWavEnc *wavenc)
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{
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wavenc->sinkpad = gst_pad_new_from_template (sinktemplate, "sink");
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gst_element_add_pad (GST_ELEMENT (wavenc), wavenc->sinkpad);
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gst_pad_set_chain_function (wavenc->sinkpad, gst_wavenc_chain);
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gst_pad_set_link_function (wavenc->sinkpad, gst_wavenc_sinkconnect);
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wavenc->srcpad = gst_pad_new_from_template (srctemplate, "src");
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gst_element_add_pad (GST_ELEMENT (wavenc), wavenc->srcpad);
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wavenc->setup = FALSE;
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wavenc->flush_header = TRUE;
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}
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static void
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gst_wavenc_chain (GstPad *pad,
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GstBuffer *buf)
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{
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GstWavEnc *wavenc;
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wavenc = GST_WAVENC (gst_pad_get_parent (pad));
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if (GST_IS_EVENT (buf)) {
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GstEvent *event = GST_EVENT (buf);
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_EOS:
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/* Should do something... */
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gst_event_unref (event);
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if (GST_PAD_IS_USABLE (wavenc->srcpad))
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gst_pad_push (wavenc->srcpad, GST_BUFFER (gst_event_new (GST_EVENT_EOS)));
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gst_element_set_eos (GST_ELEMENT (wavenc));
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break;
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default:
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gst_pad_event_default (pad, event);
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return;
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}
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}
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else {
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if (!wavenc->setup) {
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gst_buffer_unref (buf);
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gst_element_error (GST_ELEMENT (wavenc), "encoder not initialised (input is not audio?)");
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return;
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}
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if (GST_PAD_IS_USABLE (wavenc->srcpad)) {
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if (wavenc->flush_header) {
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GstBuffer *outbuf;
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outbuf = gst_buffer_new_and_alloc (WAV_HEADER_LEN);
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memcpy (GST_BUFFER_DATA (outbuf), wavenc->header, WAV_HEADER_LEN);
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GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
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gst_pad_push (wavenc->srcpad, outbuf);
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wavenc->flush_header = FALSE;
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}
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gst_pad_push (wavenc->srcpad, buf);
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}
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}
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}
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static gboolean
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plugin_init (GModule *module,
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GstPlugin *plugin)
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{
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GstElementFactory *factory;
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factory = gst_element_factory_new ("wavenc", GST_TYPE_WAVENC,
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&gst_wavenc_details);
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srctemplate = src_factory ();
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gst_element_factory_add_pad_template (factory, srctemplate);
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sinktemplate = sink_factory ();
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gst_element_factory_add_pad_template (factory, sinktemplate);
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gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
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return TRUE;
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}
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GstPluginDesc plugin_desc = {
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GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"wavenc",
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plugin_init
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};
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