summaryrefslogtreecommitdiff
path: root/src/libmad/xine_mad_decoder.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/libmad/xine_mad_decoder.c')
-rw-r--r--src/libmad/xine_mad_decoder.c375
1 files changed, 375 insertions, 0 deletions
diff --git a/src/libmad/xine_mad_decoder.c b/src/libmad/xine_mad_decoder.c
new file mode 100644
index 000000000..28407cfec
--- /dev/null
+++ b/src/libmad/xine_mad_decoder.c
@@ -0,0 +1,375 @@
+/*
+ * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * $Id: xine_decoder.c,v 1.57 2006/07/10 22:08:29 dgp85 Exp $
+ *
+ * stuff needed to turn libmad into a xine decoder plugin
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <config.h>
+
+#ifdef HAVE_MAD_H
+#include <mad.h>
+#endif
+
+#define LOG_MODULE "mad_decoder"
+#define LOG_VERBOSE
+/*
+#define LOG
+*/
+
+#include "xine_internal.h"
+#include "audio_out.h"
+#include "buffer.h"
+#include "frame.h"
+#include "synth.h"
+#include "xineutils.h"
+
+#define INPUT_BUF_SIZE 16384
+
+typedef struct {
+ audio_decoder_class_t decoder_class;
+} mad_class_t;
+
+typedef struct mad_decoder_s {
+ audio_decoder_t audio_decoder;
+
+ xine_stream_t *xstream;
+
+ int64_t pts;
+
+ struct mad_synth synth;
+ struct mad_stream stream;
+ struct mad_frame frame;
+
+ int output_sampling_rate;
+ int output_open;
+ int output_mode;
+
+ uint8_t buffer[INPUT_BUF_SIZE];
+ int bytes_in_buffer;
+ int preview_mode;
+
+} mad_decoder_t;
+
+static void mad_reset (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);
+
+ this->pts = 0;
+ this->bytes_in_buffer = 0;
+ this->preview_mode = 0;
+
+ mad_synth_init (&this->synth);
+ mad_stream_init (&this->stream);
+ this->stream.options = MAD_OPTION_IGNORECRC;
+ mad_frame_init (&this->frame);
+}
+
+
+static void mad_discontinuity (audio_decoder_t *this_gen) {
+
+ mad_decoder_t *this = (mad_decoder_t *) this_gen;
+
+ this->pts = 0;
+}
+
+/* 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;
+
+ lprintf ("decode data, decoder_flags: %d\n", buf->decoder_flags);
+
+ if (buf->size>(INPUT_BUF_SIZE-this->bytes_in_buffer)) {
+ xprintf (this->xstream->xine, XINE_VERBOSITY_DEBUG,
+ "libmad: ALERT input buffer too small (%d bytes, %d avail)!\n",
+ buf->size, INPUT_BUF_SIZE-this->bytes_in_buffer);
+ buf->size = INPUT_BUF_SIZE-this->bytes_in_buffer;
+ }
+
+ if ((buf->decoder_flags & BUF_FLAG_HEADER) == 0) {
+
+ /* reset decoder on leaving preview mode */
+ if ((buf->decoder_flags & BUF_FLAG_PREVIEW) == 0) {
+ if (this->preview_mode) {
+ mad_reset (this_gen);
+ }
+ } else {
+ this->preview_mode = 1;
+ }
+
+ xine_fast_memcpy (&this->buffer[this->bytes_in_buffer],
+ buf->content, buf->size);
+ this->bytes_in_buffer += buf->size;
+
+ /*
+ printf ("libmad: decode data - doing it\n");
+ */
+
+ 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 {
+ int mode = (this->frame.header.mode == MAD_MODE_SINGLE_CHANNEL) ? AO_CAP_MODE_MONO : AO_CAP_MODE_STEREO;
+
+ if (!this->output_open
+ || (this->output_sampling_rate != this->frame.header.samplerate)
+ || (this->output_mode != mode)) {
+
+ lprintf ("audio sample rate %d mode %08x\n", this->frame.header.samplerate, mode);
+
+ /* the mpeg audio demuxer can set audio bitrate */
+ if (! _x_stream_info_get(this->xstream, XINE_STREAM_INFO_AUDIO_BITRATE)) {
+ _x_stream_info_set(this->xstream, XINE_STREAM_INFO_AUDIO_BITRATE,
+ this->frame.header.bitrate);
+ }
+
+ /* the mpeg audio demuxer can set this meta info */
+ if (! _x_meta_info_get(this->xstream, XINE_META_INFO_AUDIOCODEC)) {
+ switch (this->frame.header.layer) {
+ case MAD_LAYER_I:
+ _x_meta_info_set_utf8(this->xstream, XINE_META_INFO_AUDIOCODEC,
+ "MPEG audio layer 1 (lib: MAD)");
+ break;
+ case MAD_LAYER_II:
+ _x_meta_info_set_utf8(this->xstream, XINE_META_INFO_AUDIOCODEC,
+ "MPEG audio layer 2 (lib: MAD)");
+ break;
+ case MAD_LAYER_III:
+ _x_meta_info_set_utf8(this->xstream, XINE_META_INFO_AUDIOCODEC,
+ "MPEG audio layer 3 (lib: MAD)");
+ break;
+ default:
+ _x_meta_info_set_utf8(this->xstream, XINE_META_INFO_AUDIOCODEC,
+ "MPEG audio (lib: MAD)");
+ }
+ }
+
+ if (this->output_open) {
+ this->xstream->audio_out->close (this->xstream->audio_out, this->xstream);
+ this->output_open = 0;
+ }
+ if (!this->output_open) {
+ this->output_open = this->xstream->audio_out->open(this->xstream->audio_out,
+ this->xstream, 16,
+ this->frame.header.samplerate,
+ mode) ;
+ }
+ if (!this->output_open) {
+ return;
+ }
+ this->output_sampling_rate = this->frame.header.samplerate;
+ this->output_mode = mode;
+ }
+
+ mad_synth_frame (&this->synth, &this->frame);
+
+ if ( (buf->decoder_flags & BUF_FLAG_PREVIEW) == 0 ) {
+
+ unsigned int nchannels, nsamples;
+ mad_fixed_t const *left_ch, *right_ch;
+ struct mad_pcm *pcm = &this->synth.pcm;
+ audio_buffer_t *audio_buffer;
+ uint16_t *output;
+
+ audio_buffer = this->xstream->audio_out->get_buffer (this->xstream->audio_out);
+ output = audio_buffer->mem;
+
+ 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++);
+
+ }
+
+ audio_buffer->num_frames = pcm->length;
+ audio_buffer->vpts = buf->pts;
+
+ this->xstream->audio_out->put_buffer (this->xstream->audio_out, audio_buffer, this->xstream);
+
+ buf->pts = 0;
+
+ }
+
+ lprintf ("decode worked\n");
+ }
+ }
+
+ }
+}
+
+static void mad_dispose (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->xstream->audio_out->close (this->xstream->audio_out, this->xstream);
+ this->output_open = 0;
+ }
+
+ free (this_gen);
+}
+
+static audio_decoder_t *open_plugin (audio_decoder_class_t *class_gen, xine_stream_t *stream) {
+
+ mad_decoder_t *this ;
+
+ this = (mad_decoder_t *) xine_xmalloc (sizeof (mad_decoder_t));
+
+ this->audio_decoder.decode_data = mad_decode_data;
+ this->audio_decoder.reset = mad_reset;
+ this->audio_decoder.discontinuity = mad_discontinuity;
+ this->audio_decoder.dispose = mad_dispose;
+
+ this->output_open = 0;
+ this->bytes_in_buffer = 0;
+ this->preview_mode = 0;
+
+ this->xstream = stream;
+
+ mad_synth_init (&this->synth);
+ mad_stream_init (&this->stream);
+ mad_frame_init (&this->frame);
+
+ this->stream.options = MAD_OPTION_IGNORECRC;
+
+ lprintf ("init\n");
+
+ return &this->audio_decoder;
+}
+
+/*
+ * mad plugin class
+ */
+
+static char *get_identifier (audio_decoder_class_t *this) {
+ return "mad";
+}
+
+static char *get_description (audio_decoder_class_t *this) {
+ return "libmad based mpeg audio layer 1/2/3 decoder plugin";
+}
+
+static void dispose_class (audio_decoder_class_t *this) {
+ free (this);
+}
+
+static void *init_plugin (xine_t *xine, void *data) {
+
+ mad_class_t *this;
+
+ this = (mad_class_t *) xine_xmalloc (sizeof (mad_class_t));
+
+ this->decoder_class.open_plugin = open_plugin;
+ this->decoder_class.get_identifier = get_identifier;
+ this->decoder_class.get_description = get_description;
+ this->decoder_class.dispose = dispose_class;
+
+ return this;
+}
+
+static uint32_t audio_types[] = {
+ BUF_AUDIO_MPEG, 0
+};
+
+static const decoder_info_t dec_info_audio = {
+ audio_types, /* supported types */
+ 7 /* priority */
+};
+
+const plugin_info_t xine_plugin_info[] EXPORTED = {
+ /* type, API, "name", version, special_info, init_function */
+ { PLUGIN_AUDIO_DECODER, 15, "mad", 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 17:51:50 +0000