summaryrefslogtreecommitdiff
path: root/src/libmad/xine_decoder.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/libmad/xine_decoder.c')
-rw-r--r--src/libmad/xine_decoder.c251
1 files changed, 251 insertions, 0 deletions
diff --git a/src/libmad/xine_decoder.c b/src/libmad/xine_decoder.c
new file mode 100644
index 000000000..d79a4f57e
--- /dev/null
+++ b/src/libmad/xine_decoder.c
@@ -0,0 +1,251 @@
+/*
+ * Copyright (C) 2000-2001 the xine project
+ *
+ * This file is part of xine, a unix 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * $Id: xine_decoder.c,v 1.1 2001/08/12 02:57:55 guenter Exp $
+ *
+ * stuff needed to turn libmad into a xine decoder plugin
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "audio_out.h"
+#include "buffer.h"
+#include "xine_internal.h"
+#include "frame.h"
+#include "synth.h"
+
+#define MAX_NUM_SAMPLES 8192
+#define INPUT_BUF_SIZE 16384
+
+typedef struct mad_decoder_s {
+ audio_decoder_t audio_decoder;
+
+ uint32_t pts;
+
+ struct mad_synth synth;
+ struct mad_stream stream;
+ struct mad_frame frame;
+
+ ao_functions_t *audio_out;
+ int output_sampling_rate;
+ int output_open;
+
+ int16_t samples[MAX_NUM_SAMPLES];
+
+ uint8_t buffer[INPUT_BUF_SIZE];
+ int bytes_in_buffer;
+
+} mad_decoder_t;
+
+static int mad_can_handle (audio_decoder_t *this_gen, int buf_type) {
+ return ((buf_type & 0xFFFF0000) == BUF_AUDIO_MPEG) ;
+}
+
+
+static void mad_init (audio_decoder_t *this_gen, ao_functions_t *audio_out) {
+
+ mad_decoder_t *this = (mad_decoder_t *) this_gen;
+
+ this->audio_out = audio_out;
+ this->output_open = 0;
+ this->bytes_in_buffer = 0;
+
+ mad_synth_init (&this->synth);
+ mad_stream_init (&this->stream);
+ mad_frame_init (&this->frame);
+
+}
+
+/* utility to scale and round samples to 16 bits */
+
+static inline
+signed int scale(mad_fixed_t sample)
+{
+ /* round */
+ sample += (1L << (MAD_F_FRACBITS - 16));
+
+ /* clip */
+ if (sample >= MAD_F_ONE)
+ sample = MAD_F_ONE - 1;
+ else if (sample < -MAD_F_ONE)
+ sample = -MAD_F_ONE;
+
+ /* quantize */
+ return sample >> (MAD_F_FRACBITS + 1 - 16);
+}
+
+/*
+static int head_check(mad_decoder_t *this) {
+
+ if( (this->header & 0xffe00000) != 0xffe00000)
+ return 0;
+ if(!((this->header>>17)&3))
+ return 0;
+ if( ((this->header>>12)&0xf) == 0xf)
+ return 0;
+ if( ((this->header>>10)&0x3) == 0x3 )
+ return 0;
+ return 1;
+}
+*/
+
+static void mad_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
+
+ mad_decoder_t *this = (mad_decoder_t *) this_gen;
+
+ /* printf ("libmad: decode data\n");
+ fflush (stdout); */
+
+ if (buf->size>(INPUT_BUF_SIZE-this->bytes_in_buffer)) {
+ printf ("libmad: ALERT input buffer too small!\n");
+ }
+
+ if (buf->decoder_info[0] >0) {
+
+ memcpy (&this->buffer[this->bytes_in_buffer],
+ buf->content, buf->size);
+ this->bytes_in_buffer += buf->size;
+
+ /*
+ printf ("libmad: decode data - doing it\n");
+ fflush (stdout);
+ */
+
+ mad_stream_buffer (&this->stream, this->buffer,
+ this->bytes_in_buffer);
+
+ while (1) {
+
+ if (mad_frame_decode (&this->frame, &this->stream) != 0) {
+
+ if (this->stream.next_frame) {
+ int num_bytes =
+ this->buffer + this->bytes_in_buffer - this->stream.next_frame;
+
+ /* printf("libmad: MAD_ERROR_BUFLEN\n"); */
+
+ memmove(this->buffer, this->stream.next_frame, num_bytes);
+ this->bytes_in_buffer = num_bytes;
+ }
+
+ switch (this->stream.error) {
+
+ case MAD_ERROR_BUFLEN:
+ return;
+
+ default:
+ mad_stream_buffer (&this->stream, this->buffer,
+ this->bytes_in_buffer);
+ }
+
+ } else {
+
+ if (!this->output_open) {
+
+ printf ("libmad: audio sample rate %d mode %d\n",
+ this->frame.header.samplerate,
+ this->frame.header.mode);
+
+ this->audio_out->open(this->audio_out,
+ 16, this->frame.header.samplerate,
+ (this->frame.header.mode == MAD_MODE_SINGLE_CHANNEL) ? AO_CAP_MODE_MONO : AO_CAP_MODE_STEREO);
+ this->output_open = 1;
+ this->output_sampling_rate = this->frame.header.samplerate;
+ }
+
+ mad_synth_frame (&this->synth, &this->frame);
+
+ {
+ unsigned int nchannels, nsamples;
+ mad_fixed_t const *left_ch, *right_ch;
+ struct mad_pcm *pcm = &this->synth.pcm;
+ uint16_t *output = this->samples;
+
+ nchannels = pcm->channels;
+ nsamples = pcm->length;
+ left_ch = pcm->samples[0];
+ right_ch = pcm->samples[1];
+
+ while (nsamples--) {
+ /* output sample(s) in 16-bit signed little-endian PCM */
+
+ *output++ = scale(*left_ch++);
+
+ if (nchannels == 2)
+ *output++ = scale(*right_ch++);
+
+ }
+
+ this->audio_out->write_audio_data (this->audio_out,
+ this->samples,
+ pcm->length,
+ buf->PTS);
+ buf->PTS = 0;
+
+ }
+ /* printf ("libmad: decode worked\n"); */
+ }
+ }
+
+ }
+}
+
+static void mad_close (audio_decoder_t *this_gen) {
+
+ mad_decoder_t *this = (mad_decoder_t *) this_gen;
+
+ mad_synth_finish (&this->synth);
+ mad_frame_finish (&this->frame);
+ mad_stream_finish(&this->stream);
+
+ if (this->output_open)
+ this->audio_out->close (this->audio_out);
+}
+
+static char *mad_get_id(void) {
+ return "mad";
+}
+
+audio_decoder_t *init_audio_decoder_plugin (int iface_version, config_values_t *cfg) {
+
+ mad_decoder_t *this ;
+
+ if (iface_version != 2) {
+ printf( "libmad: plugin doesn't support plugin API version %d.\n"
+ "libmad: this means there's a version mismatch between xine and this "
+ "libmad: decoder plugin.\nInstalling current plugins should help.\n",
+ iface_version);
+
+ return NULL;
+ }
+
+ this = (mad_decoder_t *) malloc (sizeof (mad_decoder_t));
+
+ this->audio_decoder.interface_version = 2;
+ this->audio_decoder.can_handle = mad_can_handle;
+ this->audio_decoder.init = mad_init;
+ this->audio_decoder.decode_data = mad_decode_data;
+ this->audio_decoder.close = mad_close;
+ this->audio_decoder.get_identifier = mad_get_id;
+ this->audio_decoder.priority = 5;
+
+ return (audio_decoder_t *) this;
+}
+
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-27 10:00:23 +0000