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Diffstat (limited to 'src/audio_dec/xine_lpcm_decoder.c')
-rw-r--r--src/audio_dec/xine_lpcm_decoder.c409
1 files changed, 409 insertions, 0 deletions
diff --git a/src/audio_dec/xine_lpcm_decoder.c b/src/audio_dec/xine_lpcm_decoder.c
new file mode 100644
index 000000000..db4a79fff
--- /dev/null
+++ b/src/audio_dec/xine_lpcm_decoder.c
@@ -0,0 +1,409 @@
+/*
+ * 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
+ */
+
+/**
+ * @file
+ * @author James Courtier-Dutton <james@superbug.demon.co.uk>
+ *
+ * @date 2001-08-31 Added LPCM rate sensing
+ */
+
+#ifndef __sun
+#define _XOPEN_SOURCE 500
+#endif
+/* avoid compiler warnings */
+#define _BSD_SOURCE 1
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <netinet/in.h> /* ntohs */
+
+#include <xine/xine_internal.h>
+#include <xine/audio_out.h>
+#include <xine/buffer.h>
+
+#ifdef WIN32
+#include <winsock.h>
+/*#include <Winsock2.h>*/ /* htons */
+#endif
+
+typedef struct {
+ audio_decoder_class_t decoder_class;
+} lpcm_class_t;
+
+typedef struct lpcm_decoder_s {
+ audio_decoder_t audio_decoder;
+
+ xine_stream_t *stream;
+
+ uint32_t rate;
+ uint32_t bits_per_sample;
+ uint32_t number_of_channels;
+ uint32_t ao_cap_mode;
+
+ int output_open;
+ int cpu_be; /* TRUE, if we're a Big endian CPU */
+
+ int64_t pts;
+
+ uint8_t *buf;
+ size_t buffered_bytes;
+ size_t buf_size;
+
+} lpcm_decoder_t;
+
+static void lpcm_reset (audio_decoder_t *this_gen) {
+
+ lpcm_decoder_t *this = (lpcm_decoder_t *) this_gen;
+
+ free (this->buf);
+ this->buf = NULL;
+}
+
+static void lpcm_discontinuity (audio_decoder_t *this_gen) {
+
+ lpcm_reset(this_gen);
+}
+
+static void lpcm_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
+
+ lpcm_decoder_t *this = (lpcm_decoder_t *) this_gen;
+ int16_t *sample_buffer=(int16_t *)buf->content;
+ int buf_size = buf->size;
+ int stream_be;
+ audio_buffer_t *audio_buffer;
+ int format_changed = 0;
+ int special_dvd_audio = 0;
+
+ /* Drop preview data */
+ if (buf->decoder_flags & BUF_FLAG_PREVIEW)
+ return;
+
+ /* get config byte from mpeg2 stream */
+ if ( (buf->decoder_flags & BUF_FLAG_SPECIAL) &&
+ buf->decoder_info[1] == BUF_SPECIAL_LPCM_CONFIG ) {
+ unsigned int bits_per_sample = 16;
+ unsigned int sample_rate = 0;
+ unsigned int num_channels;
+
+ lprintf("lpcm_decoder: config data 0x%x\n", buf->decoder_info[2]);
+
+ /* BluRay PCM header is 4 bytes */
+ if (buf->decoder_info[2] & 0xffffff00) {
+ static const uint8_t channels[16] = {0, 1, 0, 2, 3, 3, 4, 4, 5, 6, 7, 8, 0, 0, 0, 0};
+
+ num_channels = channels[(buf->decoder_info[2] >> (16+4)) & 0x0f];
+ switch ((buf->decoder_info[2] >> (24+6)) & 0x03) {
+ case 1: bits_per_sample = 16; break;
+ case 2: /*bits_per_sample = 20; break;*/
+ /* fall thru. Samples are 0-padded to 24 bits, and
+ * converted later to 16 bits by dropping 8 lowest bits.
+ * this needs to be changed if audio out some day accepts 24bit samples.
+ */
+ case 3: bits_per_sample = 24; break;
+ default: bits_per_sample = 0; break;
+ }
+ switch ((buf->decoder_info[2] >> 16) & 0x0f) {
+ case 1: sample_rate = 48000; break;
+ case 4: sample_rate = 96000; break;
+ case 5: sample_rate = 192000; break;
+ default: sample_rate = 0; break;
+ }
+
+ if (!num_channels || !sample_rate || !bits_per_sample)
+ xine_log (this->stream->xine, XINE_LOG_MSG,
+ "lpcm_decoder: unsupported BluRay PCM format: 0x%08x\n", buf->decoder_info[2]);
+
+ if (this->buffered_bytes)
+ xine_log (this->stream->xine, XINE_LOG_MSG, "lpcm_decoder: %zd bytes lost !\n", this->buffered_bytes);
+
+ if (!this->buf) {
+ this->buffered_bytes = 0;
+ this->buf_size = 8128;
+ this->buf = malloc(this->buf_size);
+ }
+
+ } else {
+
+ /* MPEG2/DVD PCM header is one byte */
+ num_channels = (buf->decoder_info[2] & 0x7) + 1;
+ switch ((buf->decoder_info[2]>>4) & 3) {
+ case 0: sample_rate = 48000; break;
+ case 1: sample_rate = 96000; break;
+ case 2: sample_rate = 44100; break;
+ case 3: sample_rate = 32000; break;
+ }
+ switch ((buf->decoder_info[2]>>6) & 3) {
+ case 0: bits_per_sample = 16; break;
+ case 1: bits_per_sample = 20; break;
+ case 2: bits_per_sample = 24; special_dvd_audio = 1; break;
+ }
+ }
+
+ if( this->bits_per_sample != bits_per_sample ||
+ this->number_of_channels != num_channels ||
+ this->rate != sample_rate ||
+ !this->output_open ) {
+ this->bits_per_sample = bits_per_sample;
+ this->number_of_channels = num_channels;
+ this->rate = sample_rate;
+ format_changed++;
+
+ xprintf(this->stream->xine, XINE_VERBOSITY_DEBUG,
+ "lpcm_decoder: format changed to %d channels, %d bits per sample, %d Hz, %d kbit/s\n",
+ num_channels, bits_per_sample, sample_rate, (num_channels * sample_rate * bits_per_sample)/1024);
+ }
+ }
+
+ if( buf->decoder_flags & BUF_FLAG_STDHEADER ) {
+ this->rate=buf->decoder_info[1];
+ this->bits_per_sample=buf->decoder_info[2];
+ this->number_of_channels=buf->decoder_info[3];
+ format_changed++;
+ }
+
+ /*
+ * (re-)open output device
+ */
+ if ( format_changed ) {
+ if (this->output_open)
+ this->stream->audio_out->close (this->stream->audio_out, this->stream);
+
+ this->ao_cap_mode=_x_ao_channels2mode(this->number_of_channels);
+
+ /* force 24-bit samples into 16 bits for now */
+ if (this->bits_per_sample == 24)
+ this->output_open = (this->stream->audio_out->open) (this->stream->audio_out, this->stream,
+ 16,
+ this->rate,
+ this->ao_cap_mode) ;
+ else
+ this->output_open = (this->stream->audio_out->open) (this->stream->audio_out, this->stream,
+ this->bits_per_sample,
+ this->rate,
+ this->ao_cap_mode) ;
+
+ /* stream/meta info */
+ _x_meta_info_set_utf8(this->stream, XINE_META_INFO_AUDIOCODEC, "Linear PCM");
+ _x_stream_info_set(this->stream, XINE_STREAM_INFO_AUDIO_BITRATE,
+ this->bits_per_sample * this->rate * this->number_of_channels);
+ }
+
+ if (!this->output_open || (buf->decoder_flags & BUF_FLAG_HEADER) )
+ return;
+
+ if (buf->pts && !this->pts)
+ this->pts = buf->pts;
+
+ /* data accumulation */
+ if (this->buf) {
+ int frame_end = buf->decoder_flags & BUF_FLAG_FRAME_END;
+ if (this->buffered_bytes || !frame_end) {
+ if (this->buf_size < this->buffered_bytes + buf->size) {
+ this->buf_size *= 2;
+ this->buf = realloc(this->buf, this->buf_size);
+ }
+
+ memcpy(this->buf + this->buffered_bytes, buf->content, buf->size);
+ this->buffered_bytes += buf->size;
+
+ if (!frame_end)
+ return;
+
+ sample_buffer = (int16_t*)this->buf;
+ buf_size = this->buffered_bytes;
+ this->buffered_bytes = 0;
+ }
+ }
+
+ audio_buffer = this->stream->audio_out->get_buffer (this->stream->audio_out);
+
+ /* Swap LPCM samples into native byte order, if necessary */
+ buf->type &= 0xffff0000;
+ stream_be = ( buf->type == BUF_AUDIO_LPCM_BE );
+
+ if( this->bits_per_sample == 16 ){
+ if (stream_be != this->cpu_be)
+ swab (sample_buffer, audio_buffer->mem, buf_size);
+ else
+ memcpy (audio_buffer->mem, sample_buffer, buf_size);
+ }
+ else if( this->bits_per_sample == 20 ) {
+ uint8_t *s = (uint8_t *)sample_buffer;
+ uint8_t *d = (uint8_t *)audio_buffer->mem;
+ int n = buf_size;
+
+ if (stream_be != this->cpu_be) {
+ while( n >= 0 ) {
+ swab( s, d, 8 );
+ s += 10;
+ d += 8;
+ n -= 10;
+ }
+ } else {
+ while( n >= 0 ) {
+ memcpy( d, s, 8 );
+ s += 10;
+ d += 8;
+ n -= 10;
+ }
+ }
+ } else if( this->bits_per_sample == 24 ) {
+ uint8_t *s = (uint8_t *)sample_buffer;
+ uint8_t *d = (uint8_t *)audio_buffer->mem;
+ int n = buf_size;
+
+ if ( stream_be ) {
+ if (special_dvd_audio)
+ while (n >= 12) {
+ if ( stream_be == this->cpu_be ) {
+ *d++ = s[0];
+ *d++ = s[1];
+ *d++ = s[2];
+ *d++ = s[3];
+ *d++ = s[4];
+ *d++ = s[5];
+ *d++ = s[6];
+ *d++ = s[7];
+ } else {
+ *d++ = s[1];
+ *d++ = s[0];
+ *d++ = s[3];
+ *d++ = s[2];
+ *d++ = s[5];
+ *d++ = s[4];
+ *d++ = s[7];
+ *d++ = s[6];
+ }
+ s += 12;
+ n -= 12;
+ }
+ else
+ while (n >= 3) {
+ if ( stream_be == this->cpu_be ) {
+ *d++ = s[0];
+ *d++ = s[1];
+ } else {
+ *d++ = s[1];
+ *d++ = s[0];
+ }
+ s += 3;
+ n -= 3;
+ }
+ } else {
+ while (n >= 3) {
+ if ( stream_be == this->cpu_be ) {
+ *d++ = s[1];
+ *d++ = s[2];
+ } else {
+ *d++ = s[2];
+ *d++ = s[1];
+ }
+ s += 3;
+ n -= 3;
+ }
+ }
+
+ if ( (d - (uint8_t*)audio_buffer->mem)/2*3 < buf_size )
+ xprintf(this->stream->xine, XINE_VERBOSITY_DEBUG, "lpcm_decoder: lost %i bytes of %i in the buffer\n", (int)(buf_size - (d - (uint8_t*)audio_buffer->mem)/2*3), buf_size);
+
+ } else {
+ memcpy (audio_buffer->mem, sample_buffer, buf_size);
+ }
+
+ audio_buffer->vpts = this->pts;
+ audio_buffer->num_frames = (((buf_size*8)/this->number_of_channels)/this->bits_per_sample);
+
+ this->stream->audio_out->put_buffer (this->stream->audio_out, audio_buffer, this->stream);
+
+ this->pts = 0;
+}
+
+static void lpcm_dispose (audio_decoder_t *this_gen) {
+ lpcm_decoder_t *this = (lpcm_decoder_t *) this_gen;
+
+ if (this->output_open)
+ this->stream->audio_out->close (this->stream->audio_out, this->stream);
+ this->output_open = 0;
+
+ free (this->buf);
+
+ free (this_gen);
+}
+
+static audio_decoder_t *open_plugin (audio_decoder_class_t *class_gen, xine_stream_t *stream) {
+
+ lpcm_decoder_t *this ;
+
+ this = (lpcm_decoder_t *) calloc(1, sizeof(lpcm_decoder_t));
+
+ this->audio_decoder.decode_data = lpcm_decode_data;
+ this->audio_decoder.reset = lpcm_reset;
+ this->audio_decoder.discontinuity = lpcm_discontinuity;
+ this->audio_decoder.dispose = lpcm_dispose;
+
+ this->output_open = 0;
+ this->rate = 0;
+ this->bits_per_sample=0;
+ this->number_of_channels=0;
+ this->ao_cap_mode=0;
+ this->stream = stream;
+
+ this->cpu_be = ( htons(1) == 1 );
+
+ return &this->audio_decoder;
+}
+
+static void *init_plugin (xine_t *xine, void *data) {
+
+ lpcm_class_t *this ;
+
+ this = (lpcm_class_t *) calloc(1, sizeof(lpcm_class_t));
+
+ this->decoder_class.open_plugin = open_plugin;
+ this->decoder_class.identifier = "Linear PCM";
+ this->decoder_class.description = N_("Linear PCM audio decoder plugin");
+ this->decoder_class.dispose = default_audio_decoder_class_dispose;
+
+ return this;
+}
+
+static const uint32_t audio_types[] = {
+ BUF_AUDIO_LPCM_BE, BUF_AUDIO_LPCM_LE, 0
+};
+
+static const decoder_info_t dec_info_audio = {
+ audio_types, /* supported types */
+ 1 /* priority */
+};
+
+const plugin_info_t xine_plugin_info[] EXPORTED = {
+ /* type, API, "name", version, special_info, init_function */
+ { PLUGIN_AUDIO_DECODER, 16, "pcm", 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 13:58:01 +0000