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Diffstat (limited to 'src/libxineadec/interplayaudio.c')
| -rw-r--r-- | src/libxineadec/interplayaudio.c | 357 |
1 files changed, 0 insertions, 357 deletions
diff --git a/src/libxineadec/interplayaudio.c b/src/libxineadec/interplayaudio.c deleted file mode 100644 index 7d05f41ac..000000000 --- a/src/libxineadec/interplayaudio.c +++ /dev/null @@ -1,357 +0,0 @@ -/* - * 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 1.8 2004/01/12 17:35:18 miguelfreitas 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_STDHEADER) { - - /* 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 */ - _x_meta_info_set(this->stream, XINE_META_INFO_AUDIOCODEC, - "Interplay MVE DPCM"); - - 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; - xprintf(this->stream->xine, XINE_VERBOSITY_DEBUG, - "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) { - xprintf (this->stream->xine, XINE_VERBOSITY_DEBUG, - "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 *) xine_xmalloc (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 *) xine_xmalloc (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, 15, "interplayaudio", XINE_VERSION_CODE, &dec_info_audio, &init_plugin }, - { PLUGIN_NONE, 0, "", 0, NULL, NULL } -}; - |