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-rw-r--r--src/audio_dec/gsm610.c281
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diff --git a/src/audio_dec/gsm610.c b/src/audio_dec/gsm610.c
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+/*
+ * Copyright (C) 2000-2003 the xine project
+ *
+ * This file is part of xine, a free video player.
+ *
+ * xine is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * xine 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
+ *
+ * GSM 6.10 Audio Decoder
+ * This decoder is based on the GSM 6.10 codec library found at:
+ * http://kbs.cs.tu-berlin.de/~jutta/toast.html
+ * Additionally, here is an article regarding the software that appeared
+ * in Dr. Dobbs Journal:
+ * http://www.ddj.com/documents/s=1012/ddj9412b/9412b.htm
+ *
+ * This is the notice that comes with the software:
+ * --------------------------------------------------------------------
+ * Copyright 1992, 1993, 1994 by Jutta Degener and Carsten Bormann,
+ * Technische Universitaet Berlin
+ *
+ * Any use of this software is permitted provided that this notice is not
+ * removed and that neither the authors nor the Technische Universitaet Berlin
+ * are deemed to have made any representations as to the suitability of this
+ * software for any purpose nor are held responsible for any defects of
+ * this software. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
+ *
+ * As a matter of courtesy, the authors request to be informed about uses
+ * this software has found, about bugs in this software, and about any
+ * improvements that may be of general interest.
+ *
+ * Berlin, 28.11.1994
+ * Jutta Degener
+ * Carsten Bormann
+ * --------------------------------------------------------------------
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <xine/xine_internal.h>
+#include <xine/audio_out.h>
+#include <xine/buffer.h>
+#include <xine/xineutils.h>
+#include "bswap.h"
+
+#include "private.h"
+#include "gsm.h"
+
+#define AUDIOBUFSIZE 128*1024
+
+#define GSM610_SAMPLE_SIZE 16
+#define GSM610_BLOCK_SIZE 160
+
+typedef struct {
+ audio_decoder_class_t decoder_class;
+} gsm610_class_t;
+
+typedef struct gsm610_decoder_s {
+ audio_decoder_t audio_decoder;
+
+ xine_stream_t *stream;
+
+ unsigned int buf_type;
+ int output_open;
+ int sample_rate;
+
+ unsigned char *buf;
+ int bufsize;
+ int size;
+
+ gsm gsm_state;
+
+} gsm610_decoder_t;
+
+/**************************************************************************
+ * xine audio plugin functions
+ *************************************************************************/
+
+static void gsm610_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
+
+ gsm610_decoder_t *this = (gsm610_decoder_t *) this_gen;
+ audio_buffer_t *audio_buffer;
+ int in_ptr;
+
+ if (buf->decoder_flags & BUF_FLAG_STDHEADER) {
+ this->sample_rate = buf->decoder_info[1];
+
+ this->buf = calloc(1, AUDIOBUFSIZE);
+ this->bufsize = AUDIOBUFSIZE;
+ this->size = 0;
+
+ /* stream/meta info */
+ _x_meta_info_set_utf8(this->stream, XINE_META_INFO_AUDIOCODEC, "GSM 6.10");
+
+ return;
+ }
+
+ if (!this->output_open) {
+
+ this->gsm_state = gsm_create();
+ this->buf_type = buf->type;
+
+ this->output_open = (this->stream->audio_out->open) (this->stream->audio_out,
+ this->stream, GSM610_SAMPLE_SIZE, this->sample_rate, AO_CAP_MODE_MONO);
+ }
+
+ /* if the audio still isn't open, bail */
+ if (!this->output_open)
+ return;
+
+ if( this->size + buf->size > this->bufsize ) {
+ this->bufsize = this->size + 2 * buf->size;
+ xprintf(this->stream->xine, XINE_VERBOSITY_DEBUG,
+ "gsm610: increasing source buffer to %d to avoid overflow.\n", this->bufsize);
+ this->buf = realloc( this->buf, this->bufsize );
+ }
+
+ xine_fast_memcpy (&this->buf[this->size], buf->content, buf->size);
+ this->size += buf->size;
+
+ if (buf->decoder_flags & BUF_FLAG_FRAME_END) { /* time to decode a frame */
+ int16_t decode_buffer[GSM610_BLOCK_SIZE];
+
+ /* handle the Microsoft variant of GSM data */
+ if (this->buf_type == BUF_AUDIO_MSGSM) {
+
+ this->gsm_state->wav_fmt = 1;
+
+ /* the data should line up on a 65-byte boundary */
+ if ((buf->size % 65) != 0) {
+ xprintf (this->stream->xine, XINE_VERBOSITY_DEBUG,
+ "gsm610: received MS GSM block that does not line up\n");
+ this->size = 0;
+ return;
+ }
+
+ in_ptr = 0;
+ while (this->size) {
+ gsm_decode(this->gsm_state, &this->buf[in_ptr], decode_buffer);
+ if ((in_ptr % 65) == 0) {
+ in_ptr += 33;
+ this->size -= 33;
+ } else {
+ in_ptr += 32;
+ this->size -= 32;
+ }
+
+ /* dispatch the decoded audio; assume that the audio buffer will
+ * always contain at least 160 samples */
+ audio_buffer = this->stream->audio_out->get_buffer (this->stream->audio_out);
+
+ xine_fast_memcpy(audio_buffer->mem, decode_buffer,
+ GSM610_BLOCK_SIZE * 2);
+ audio_buffer->num_frames = GSM610_BLOCK_SIZE;
+
+ audio_buffer->vpts = buf->pts;
+ buf->pts = 0; /* only first buffer gets the real pts */
+ this->stream->audio_out->put_buffer (this->stream->audio_out, audio_buffer, this->stream);
+ }
+ } else {
+
+ /* handle the other variant, which consists of 33-byte blocks */
+ this->gsm_state->wav_fmt = 0;
+
+ /* the data should line up on a 33-byte boundary */
+ if ((buf->size % 33) != 0) {
+ xprintf (this->stream->xine, XINE_VERBOSITY_DEBUG, "gsm610: received GSM block that does not line up\n");
+ this->size = 0;
+ return;
+ }
+
+ in_ptr = 0;
+ while (this->size) {
+ gsm_decode(this->gsm_state, &this->buf[in_ptr], decode_buffer);
+ in_ptr += 33;
+ this->size -= 33;
+
+ /* dispatch the decoded audio; assume that the audio buffer will
+ * always contain at least 160 samples */
+ audio_buffer = this->stream->audio_out->get_buffer (this->stream->audio_out);
+
+ xine_fast_memcpy(audio_buffer->mem, decode_buffer,
+ GSM610_BLOCK_SIZE * 2);
+ audio_buffer->num_frames = GSM610_BLOCK_SIZE;
+
+ audio_buffer->vpts = buf->pts;
+ buf->pts = 0; /* only first buffer gets the real pts */
+ this->stream->audio_out->put_buffer (this->stream->audio_out, audio_buffer, this->stream);
+ }
+ }
+ }
+}
+
+static void gsm610_reset (audio_decoder_t *this_gen) {
+}
+
+static void gsm610_discontinuity (audio_decoder_t *this_gen) {
+}
+
+static void gsm610_dispose (audio_decoder_t *this_gen) {
+
+ gsm610_decoder_t *this = (gsm610_decoder_t *) this_gen;
+
+ if (this->gsm_state)
+ gsm_destroy(this->gsm_state);
+
+ if (this->output_open)
+ this->stream->audio_out->close (this->stream->audio_out, this->stream);
+ this->output_open = 0;
+
+ if (this->buf)
+ free(this->buf);
+
+ free (this_gen);
+}
+
+static audio_decoder_t *open_plugin (audio_decoder_class_t *class_gen, xine_stream_t *stream) {
+
+ gsm610_decoder_t *this ;
+
+ this = (gsm610_decoder_t *) calloc(1, sizeof(gsm610_decoder_t));
+
+ this->audio_decoder.decode_data = gsm610_decode_data;
+ this->audio_decoder.reset = gsm610_reset;
+ this->audio_decoder.discontinuity = gsm610_discontinuity;
+ this->audio_decoder.dispose = gsm610_dispose;
+
+ this->output_open = 0;
+ this->sample_rate = 0;
+ this->stream = stream;
+ this->buf = NULL;
+ this->size = 0;
+
+ return &this->audio_decoder;
+}
+
+static void *init_plugin (xine_t *xine, void *data) {
+
+ gsm610_class_t *this ;
+
+ this = (gsm610_class_t *) calloc(1, sizeof(gsm610_class_t));
+
+ this->decoder_class.open_plugin = open_plugin;
+ this->decoder_class.identifier = "GSM 6.10";
+ this->decoder_class.description = N_("GSM 6.10 audio decoder plugin");
+ this->decoder_class.dispose = default_audio_decoder_class_dispose;
+
+ return this;
+}
+
+static const uint32_t audio_types[] = {
+ BUF_AUDIO_MSGSM,
+ BUF_AUDIO_GSM610,
+ 0
+};
+
+static const decoder_info_t dec_info_audio = {
+ audio_types, /* supported types */
+ 9 /* priority */
+};
+
+const plugin_info_t xine_plugin_info[] EXPORTED = {
+ /* type, API, "name", version, special_info, init_function */
+ { PLUGIN_AUDIO_DECODER, 16, "gsm610", XINE_VERSION_CODE, &dec_info_audio, init_plugin },
+ { PLUGIN_NONE, 0, "", 0, NULL, NULL }
+};
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-25 18:02:48 +0000