/* 2004.02.01 first released source code for IOMP */ /* * Copyright (C) 2000-2002 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 * * RoQ DPCM Audio Decoder by Mike Melanson (melanson@pcisys.net) * For more information regarding the RoQ file format, visit: * http://www.csse.monash.edu.au/~timf/ * * $Id: roqaudio.c,v 1.2 2003/11/25 04:26:04 georgedon Exp $ * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include "xine_internal.h" #include "audio_out.h" #include "buffer.h" #include "xineutils.h" #include "bswap.h" #define RoQ_AUDIO_SAMPLE_RATE 22050 #define RoQ_AUDIO_BITS_PER_SAMPLE 16 #define AUDIOBUFSIZE 128*1024 #define CLAMP_S16(x) if (x < -32768) x = -32768; \ else if (x > 32767) x = 32767; #define SE_16BIT(x) if (x & 0x8000) x -= 0x10000; typedef struct { audio_decoder_class_t decoder_class; } roqaudio_class_t; typedef struct roqaudio_decoder_s { audio_decoder_t audio_decoder; xine_stream_t *stream; int64_t pts; int output_open; int output_channels; unsigned char *buf; int bufsize; int size; short square_array[256]; } roqaudio_decoder_t; static void roqaudio_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) { roqaudio_decoder_t *this = (roqaudio_decoder_t *) this_gen; audio_buffer_t *audio_buffer; int in, out; int predictor[2]; int channel_number = 0; if (buf->decoder_flags & BUF_FLAG_HEADER) { this->output_channels = buf->decoder_info[3]; this->buf = xine_xmalloc(AUDIOBUFSIZE); this->bufsize = AUDIOBUFSIZE; this->size = 0; /* stream/meta info */ this->stream->meta_info[XINE_META_INFO_AUDIOCODEC] = strdup("RoQ DPCM Audio"); return; } if (!this->output_open) { this->output_open = this->stream->audio_out->open(this->stream->audio_out, this->stream, RoQ_AUDIO_BITS_PER_SAMPLE, RoQ_AUDIO_SAMPLE_RATE, (this->output_channels == 2) ? AO_CAP_MODE_STEREO : AO_CAP_MODE_MONO); } /* if the audio still isn't open, bail */ if (!this->output_open) return; if( this->size + buf->size > this->bufsize ) { this->bufsize = this->size + 2 * buf->size; printf("RoQ: 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; if (buf->decoder_flags & BUF_FLAG_FRAME_END) { /* time to decode a frame */ audio_buffer = this->stream->audio_out->get_buffer (this->stream->audio_out); out = 0; /* prepare the initial predictors */ if (this->output_channels == 1) predictor[0] = LE_16(&this->buf[6]); else { predictor[0] = this->buf[7] << 8; predictor[1] = this->buf[6] << 8; } SE_16BIT(predictor[0]); SE_16BIT(predictor[1]); /* decode the samples */ for (in = 8; in < this->size; in++) { predictor[channel_number] += this->square_array[this->buf[in]]; CLAMP_S16(predictor[channel_number]); audio_buffer->mem[out++] = predictor[channel_number]; /* toggle channel */ channel_number ^= this->output_channels - 1; } audio_buffer->vpts = buf->pts; audio_buffer->num_frames = (buf->size - 8) / this->output_channels; this->stream->audio_out->put_buffer (this->stream->audio_out, audio_buffer, this->stream); this->size = 0; } } static void roqaudio_reset (audio_decoder_t *this_gen) { } static void roqaudio_discontinuity (audio_decoder_t *this_gen) { roqaudio_decoder_t *this = (roqaudio_decoder_t *) this_gen; this->pts = 0; } static void roqaudio_dispose (audio_decoder_t *this_gen) { roqaudio_decoder_t *this = (roqaudio_decoder_t *) this_gen; if (this->output_open) this->stream->audio_out->close (this->stream->audio_out, this->stream); this->output_open = 0; if (this->buf) free(this->buf); free (this_gen); } static audio_decoder_t *open_plugin (audio_decoder_class_t *class_gen, xine_stream_t *stream) { roqaudio_decoder_t *this; int i; short square; this = (roqaudio_decoder_t *) xine_xmalloc (sizeof (roqaudio_decoder_t)); this->audio_decoder.decode_data = roqaudio_decode_data; this->audio_decoder.reset = roqaudio_reset; this->audio_decoder.discontinuity = roqaudio_discontinuity; this->audio_decoder.dispose = roqaudio_dispose; this->size = 0; this->stream = stream; this->buf = NULL; this->output_open = 0; this->output_channels = 0; /* initialize tables of squares */ for (i = 0; i < 128; i++) { square = i * i; this->square_array[i] = square; this->square_array[i + 128] = -square; } return &this->audio_decoder; } static char *get_identifier (audio_decoder_class_t *this) { return "RoQ Audio"; } static char *get_description (audio_decoder_class_t *this) { return "Id Roq audio decoder plugin"; } static void dispose_class (audio_decoder_class_t *this) { free (this); } static void *init_plugin (xine_t *xine, void *data) { roqaudio_class_t *this; this = (roqaudio_class_t *) xine_xmalloc (sizeof (roqaudio_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_ROQ, 0 }; static decoder_info_t dec_info_audio = { audio_types, /* supported types */ 5 /* priority */ }; plugin_info_t xine_plugin_info[] = { /* type, API, "name", version, special_info, init_function */ { PLUGIN_AUDIO_DECODER, 13, "roqaudio", XINE_VERSION_CODE, &dec_info_audio, init_plugin }, { PLUGIN_NONE, 0, "", 0, NULL, NULL } };