diff options
| -rw-r--r-- | src/libxineadec/Makefile.am | 7 | ||||
| -rw-r--r-- | src/libxineadec/interplayaudio.c | 356 |
2 files changed, 362 insertions, 1 deletions
diff --git a/src/libxineadec/Makefile.am b/src/libxineadec/Makefile.am index 1907a5fc5..ad3482876 100644 --- a/src/libxineadec/Makefile.am +++ b/src/libxineadec/Makefile.am @@ -15,7 +15,8 @@ lib_LTLIBRARIES = \ xineplug_decode_adpcm.la \ xineplug_decode_logpcm.la \ xineplug_decode_roqaudio.la \ - xineplug_decode_gsm610.la + xineplug_decode_gsm610.la \ + xineplug_decode_interplayaudio.la xineplug_decode_roqaudio_la_SOURCES = roqaudio.c xineplug_decode_roqaudio_la_LDFLAGS = -avoid-version -module @XINE_PLUGIN_MIN_SYMS@ @@ -34,6 +35,10 @@ xineplug_decode_gsm610_la_LIBADD = \ $(XINE_LIB) \ $(top_builddir)/src/libxineadec/gsm610/libgsm610.la +xineplug_decode_interplayaudio_la_SOURCES = interplayaudio.c +xineplug_decode_interplayaudio_la_LIBADD = $(top_builddir)/src/xine-engine/libxine.la +xineplug_decode_interplayaudio_la_LDFLAGS = -avoid-version -module @XINE_PLUGIN_MIN_SYMS@ + # noinst_HEADERS = $(XINE_LIB): diff --git a/src/libxineadec/interplayaudio.c b/src/libxineadec/interplayaudio.c new file mode 100644 index 000000000..1b53e4634 --- /dev/null +++ b/src/libxineadec/interplayaudio.c @@ -0,0 +1,356 @@ +/* + * Copyright (C) 2000-2001 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 + * + * Interplay DPCM Audio Decoder by Mike Melanson (melanson@pcisys.net) + * For more information regarding the Interplay MVE file format, visit: + * http://www.pcisys.net/~melanson/codecs/ + * + * $Id: interplayaudio.c,v 1.1 2002/12/28 18:25:08 tmmm Exp $ + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/types.h> +#include <unistd.h> + +#include "xine_internal.h" +#include "audio_out.h" +#include "buffer.h" +#include "xineutils.h" +#include "bswap.h" + +#define AUDIOBUFSIZE 128*1024 + +typedef struct { + audio_decoder_class_t decoder_class; +} interplay_class_t; + +typedef struct interplay_decoder_s { + audio_decoder_t audio_decoder; + + xine_stream_t *stream; + + int sample_rate; /* audio sample rate */ + int bits_per_sample; /* bits/sample, usually 8 or 16 */ + int channels; /* 1 or 2, usually */ + + int output_open; /* flag to indicate audio is ready */ + + unsigned char *buf; /* data accumulation buffer */ + int bufsize; /* maximum size of buf */ + int size; /* size of accumulated data in buf */ + + int last_left_delta; + int last_right_delta; + +} interplay_decoder_t; + +/************************************************************************** + * Interplay DPCM specific decode functions + *************************************************************************/ + +int interplay_delta_table[] = { + 0, 1, 2, 3, 4, 5, 6, 7, + 8, 9, 10, 11, 12, 13, 14, 15, + 16, 17, 18, 19, 20, 21, 22, 23, + 24, 25, 26, 27, 28, 29, 30, 31, + 32, 33, 34, 35, 36, 37, 38, 39, + 40, 41, 42, 43, 47, 51, 56, 61, + 66, 72, 79, 86, 94, 102, 112, 122, + 133, 145, 158, 173, 189, 206, 225, 245, + 267, 292, 318, 348, 379, 414, 452, 493, + 538, 587, 640, 699, 763, 832, 908, 991, + 1081, 1180, 1288, 1405, 1534, 1673, 1826, 1993, + 2175, 2373, 2590, 2826, 3084, 3365, 3672, 4008, + 4373, 4772, 5208, 5683, 6202, 6767, 7385, 8059, + 8794, 9597, 10472, 11428, 12471, 13609, 14851, 16206, + 17685, 19298, 21060, 22981, 25078, 27367, 29864, 32589, + -29973, -26728, -23186, -19322, -15105, -10503, -5481, -1, + 1, 1, 5481, 10503, 15105, 19322, 23186, 26728, + 29973, -32589, -29864, -27367, -25078, -22981, -21060, -19298, + -17685, -16206, -14851, -13609, -12471, -11428, -10472, -9597, + -8794, -8059, -7385, -6767, -6202, -5683, -5208, -4772, + -4373, -4008, -3672, -3365, -3084, -2826, -2590, -2373, + -2175, -1993, -1826, -1673, -1534, -1405, -1288, -1180, + -1081, -991, -908, -832, -763, -699, -640, -587, + -538, -493, -452, -414, -379, -348, -318, -292, + -267, -245, -225, -206, -189, -173, -158, -145, + -133, -122, -112, -102, -94, -86, -79, -72, + -66, -61, -56, -51, -47, -43, -42, -41, + -40, -39, -38, -37, -36, -35, -34, -33, + -32, -31, -30, -29, -28, -27, -26, -25, + -24, -23, -22, -21, -20, -19, -18, -17, + -16, -15, -14, -13, -12, -11, -10, -9, + -8, -7, -6, -5, -4, -3, -2, -1 + +}; + +/************************************************************************** + * xine audio plugin functions + *************************************************************************/ + +/* clamp a number within a signed 16-bit range */ +#define CLAMP_S16(x) if (x < -32768) x = -32768; \ + else if (x > 32767) x = 32767; + +static void interplay_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) { + + interplay_decoder_t *this = (interplay_decoder_t *) this_gen; + audio_buffer_t *audio_buffer; + int i; + int samples_to_send; + int delta[2]; + int stream_ptr = 0; + int sequence_number; + int channel_number = 0; + + if (buf->decoder_flags & BUF_FLAG_HEADER) { + + /* When the engine sends a BUF_FLAG_HEADER flag, it is time to initialize + * the decoder. The buffer element type has 4 decoder_info fields, + * 0..3. Field 1 is the sample rate. Field 2 is the bits/sample. Field + * 3 is the number of channels. */ + this->sample_rate = buf->decoder_info[1]; + this->bits_per_sample = buf->decoder_info[2]; + this->channels = buf->decoder_info[3]; + + /* initialize the data accumulation buffer */ + this->buf = xine_xmalloc(AUDIOBUFSIZE); + this->bufsize = AUDIOBUFSIZE; + this->size = 0; + + /* take this opportunity to initialize stream/meta information */ + this->stream->meta_info[XINE_META_INFO_AUDIOCODEC] = strdup("Interplay MVE DPCM"); + this->stream->stream_info[XINE_STREAM_INFO_AUDIO_HANDLED] = 1; + + return; + } + + /* if the audio output is not open yet, open the audio output */ + if (!this->output_open) { + this->output_open = this->stream->audio_out->open( + this->stream->audio_out, + this->stream, + 16, + this->sample_rate, + (this->channels == 2) ? AO_CAP_MODE_STEREO : AO_CAP_MODE_MONO); + } + + /* if the audio still isn't open, do not go any further with the decode */ + if (!this->output_open) + return; + + /* accumulate the data passed through the buffer element type; increase + * the accumulator buffer size as necessary */ + if( this->size + buf->size > this->bufsize ) { + this->bufsize = this->size + 2 * buf->size; + printf("interplayaudio: 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; + + /* When a buffer element type has the BUF_FLAG_FRAME_END flag set, it is + * time to decode the data in the buffer. */ + if (buf->decoder_flags & BUF_FLAG_FRAME_END) { + + /* if this is the first frame, fetch the first deltas from the stream */ + sequence_number = LE_16(&this->buf[stream_ptr]); + stream_ptr += 6; /* skip over the stream mask and stream length */ + if (sequence_number == 1) { + delta[0] = LE_16(&this->buf[stream_ptr]); + stream_ptr += 2; + if (this->channels == 2) { + delta[1] = LE_16(&this->buf[stream_ptr]); + stream_ptr += 2; + } + } else { + delta[0] = this->last_left_delta; + if (this->channels == 2) + delta[1] = this->last_right_delta; + } + + /* iterate through each 8-bit delta in the input buffer */ + while (stream_ptr < this->size) { + + audio_buffer = this->stream->audio_out->get_buffer (this->stream->audio_out); + if (audio_buffer->mem_size == 0) { + printf ("interplayaudio: Help! Allocated audio buffer with nothing in it!\n"); + return; + } + + /* this->size and stream_ptr are sample counts, mem_size is a byte count */ + if ((this->size - stream_ptr) > (audio_buffer->mem_size / 2)) + samples_to_send = audio_buffer->mem_size / 2; + else + samples_to_send = this->size - stream_ptr; + + /* fill up this buffer */ + for (i = 0; i < samples_to_send; i++) { + delta[channel_number] += interplay_delta_table[this->buf[stream_ptr++]]; + CLAMP_S16(delta[channel_number]); + audio_buffer->mem[i] = delta[channel_number]; + + /* toggle channel */ + channel_number ^= this->channels - 1; + } + + audio_buffer->num_frames = samples_to_send / this->channels; + 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); + } + + /* stash away the deltas for the next block */ + this->last_left_delta = delta[0]; + this->last_right_delta = delta[1]; + + /* reset data accumulation buffer */ + this->size = 0; + } +} + +/* This function resets the state of the audio decoder. This usually + * entails resetting the data accumulation buffer. */ +static void interplay_reset (audio_decoder_t *this_gen) { + + interplay_decoder_t *this = (interplay_decoder_t *) this_gen; + + this->size = 0; +} + +/* This function resets the last pts value of the audio decoder. */ +static void interplay_discontinuity (audio_decoder_t *this_gen) { +} + +/* This function closes the audio output and frees the private audio decoder + * structure. */ +static void interplay_dispose (audio_decoder_t *this_gen) { + + interplay_decoder_t *this = (interplay_decoder_t *) this_gen; + + /* close the audio output */ + if (this->output_open) + this->stream->audio_out->close (this->stream->audio_out, this->stream); + this->output_open = 0; + + /* free anything that was allocated during operation */ + free(this->buf); + free(this); +} + +/* This function allocates, initializes, and returns a private audio + * decoder structure. */ +static audio_decoder_t *open_plugin (audio_decoder_class_t *class_gen, xine_stream_t *stream) { + + interplay_decoder_t *this ; + + this = (interplay_decoder_t *) malloc (sizeof (interplay_decoder_t)); + + /* connect the member functions */ + this->audio_decoder.decode_data = interplay_decode_data; + this->audio_decoder.reset = interplay_reset; + this->audio_decoder.discontinuity = interplay_discontinuity; + this->audio_decoder.dispose = interplay_dispose; + + /* connect the stream */ + this->stream = stream; + + /* audio output is not open at the start */ + this->output_open = 0; + + /* initialize the basic audio parameters */ + this->channels = 0; + this->sample_rate = 0; + this->bits_per_sample = 0; + + /* initialize the data accumulation buffer */ + this->buf = NULL; + this->bufsize = 0; + this->size = 0; + + /* return the newly-initialized audio decoder */ + return &this->audio_decoder; +} + +/* This function returns a brief string that describes (usually with the + * decoder's most basic name) the audio decoder plugin. */ +static char *get_identifier (audio_decoder_class_t *this) { + return "Interplay DPCM Audio"; +} + +/* This function returns a slightly longer string describing the audio + * decoder plugin. */ +static char *get_description (audio_decoder_class_t *this) { + return "Interplay DPCM audio decoder plugin"; +} + +/* This function frees the audio decoder class and any other memory that was + * allocated. */ +static void dispose_class (audio_decoder_class_t *this_gen) { + + interplay_class_t *this = (interplay_class_t *)this_gen; + + free (this); +} + +/* This function allocates a private audio decoder class and initializes + * the class's member functions. */ +static void *init_plugin (xine_t *xine, void *data) { + + interplay_class_t *this ; + + this = (interplay_class_t *) malloc (sizeof (interplay_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; +} + +/* This is a list of all of the internal xine audio buffer types that + * this decoder is able to handle. Check src/xine-engine/buffer.h for a + * list of valid buffer types (and add a new one if the one you need does + * not exist). Terminate the list with a 0. */ +static uint32_t audio_types[] = { + BUF_AUDIO_INTERPLAY, + 0 +}; + +/* This data structure combines the list of supported xine buffer types and + * the priority that the plugin should be given with respect to other + * plugins that handle the same buffer type. A plugin with priority (n+1) + * will be used instead of a plugin with priority (n). */ +static decoder_info_t dec_info_audio = { + audio_types, /* supported types */ + 5 /* priority */ +}; + +/* The plugin catalog entry. This is the only information that this plugin + * will export to the public. */ +plugin_info_t xine_plugin_info[] = { + /* { type, API version, "name", version, special_info, init_function }, */ + { PLUGIN_AUDIO_DECODER, 13, "interplayaudio", XINE_VERSION_CODE, &dec_info_audio, &init_plugin }, + { PLUGIN_NONE, 0, "", 0, NULL, NULL } +}; + |