diff options
Diffstat (limited to 'src/libac3/xine_decoder.c')
| -rw-r--r-- | src/libac3/xine_decoder.c | 474 |
1 files changed, 0 insertions, 474 deletions
diff --git a/src/libac3/xine_decoder.c b/src/libac3/xine_decoder.c deleted file mode 100644 index 7b7ee8794..000000000 --- a/src/libac3/xine_decoder.c +++ /dev/null @@ -1,474 +0,0 @@ -/* - * Copyright (C) 2000-2001 the xine project - * - * This file is part of xine, a unix 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 1.24 2001/08/28 19:16:19 guenter Exp $ - * - * stuff needed to turn libac3 into a xine decoder plugin - */ - - -#include <stdlib.h> -#include <unistd.h> -#include <string.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <fcntl.h> - -#include "audio_out.h" -#include "ac3.h" -#include "ac3_internal.h" -#include "buffer.h" -#include "xine_internal.h" - -#define FRAME_SIZE 4096+512 - -#undef DEBUG_AC3 -#ifdef DEBUG_AC3 -int ac3file; -#endif - -typedef struct ac3dec_decoder_s { - audio_decoder_t audio_decoder; - - uint32_t pts; - uint32_t last_pts; - - uint8_t frame_buffer[FRAME_SIZE]; - uint8_t *frame_ptr; - int sync_todo; - int frame_length, frame_todo; - uint16_t syncword; - - ac3_state_t ac3_state; - int ac3_flags; - int ac3_bit_rate; - int ac3_sample_rate; - float ac3_level; - int have_lfe; - - int ac3_flags_map[8]; - int ao_flags_map[8]; - - int16_t int_samples [6 * 256 * 6]; - sample_t delay[6*256]; - sample_t samples[6][256]; - - ao_instance_t *audio_out; - int audio_caps; - int bypass_mode; - int output_sampling_rate; - int output_open; - int output_mode; - -} ac3dec_decoder_t; - -int ac3dec_can_handle (audio_decoder_t *this_gen, int buf_type) { - return ((buf_type & 0xFFFF0000) == BUF_AUDIO_A52) ; -} - - -void ac3dec_init (audio_decoder_t *this_gen, ao_instance_t *audio_out) { - - ac3dec_decoder_t *this = (ac3dec_decoder_t *) this_gen; - /* int i; */ - - this->audio_out = audio_out; - this->audio_caps = audio_out->get_capabilities(audio_out); - this->syncword = 0; - this->sync_todo = 7; - this->output_open = 0; - this->pts = 0; - this->last_pts = 0; - - ac3_init (); - - /* - * find out if this driver supports ac3 output - * or, if not, how many channels we've got - */ - - if (this->audio_caps & AO_CAP_MODE_AC3) - this->bypass_mode = 1; - else { - this->bypass_mode = 0; - - this->ac3_flags_map[AC3_MONO] = AC3_MONO; - this->ac3_flags_map[AC3_STEREO] = AC3_STEREO; - this->ac3_flags_map[AC3_3F] = AC3_STEREO; - this->ac3_flags_map[AC3_2F1R] = AC3_STEREO; - this->ac3_flags_map[AC3_3F1R] = AC3_STEREO; - this->ac3_flags_map[AC3_2F2R] = AC3_STEREO; - this->ac3_flags_map[AC3_3F2R] = AC3_STEREO; - - this->ao_flags_map[AC3_MONO] = AO_CAP_MODE_MONO; - this->ao_flags_map[AC3_STEREO] = AO_CAP_MODE_STEREO; - this->ao_flags_map[AC3_3F] = AO_CAP_MODE_STEREO; - this->ao_flags_map[AC3_2F1R] = AO_CAP_MODE_STEREO; - this->ao_flags_map[AC3_3F1R] = AO_CAP_MODE_STEREO; - this->ao_flags_map[AC3_2F2R] = AO_CAP_MODE_STEREO; - this->ao_flags_map[AC3_3F2R] = AO_CAP_MODE_STEREO; - - /* find best mode */ - if (this->audio_caps & AO_CAP_MODE_5_1CHANNEL) { - - this->ac3_flags_map[AC3_2F2R] = AC3_2F2R; - this->ac3_flags_map[AC3_3F2R] = AC3_3F2R | AC3_LFE; - this->ao_flags_map[AC3_2F2R] = AO_CAP_MODE_4CHANNEL; - this->ao_flags_map[AC3_3F2R] = AO_CAP_MODE_5CHANNEL; - - } else if (this->audio_caps & AO_CAP_MODE_5CHANNEL) { - - this->ac3_flags_map[AC3_2F2R] = AC3_2F2R; - this->ac3_flags_map[AC3_3F2R] = AC3_3F2R; - this->ao_flags_map[AC3_2F2R] = AO_CAP_MODE_4CHANNEL; - this->ao_flags_map[AC3_3F2R] = AO_CAP_MODE_5CHANNEL; - - } else if (this->audio_caps & AO_CAP_MODE_4CHANNEL) { - - this->ac3_flags_map[AC3_2F2R] = AC3_2F2R; - this->ac3_flags_map[AC3_3F2R] = AC3_2F2R; - - this->ao_flags_map[AC3_2F2R] = AO_CAP_MODE_4CHANNEL; - this->ao_flags_map[AC3_3F2R] = AO_CAP_MODE_4CHANNEL; - - /* else if (this->audio_caps & AO_CAP_MODE_STEREO) - defaults are ok */ - } else if (!(this->audio_caps & AO_CAP_MODE_STEREO)) { - printf ("HELP! a mono-only audio driver?!\n"); - - this->ac3_flags_map[AC3_MONO] = AC3_MONO; - this->ac3_flags_map[AC3_STEREO] = AC3_MONO; - this->ac3_flags_map[AC3_3F] = AC3_MONO; - this->ac3_flags_map[AC3_2F1R] = AC3_MONO; - this->ac3_flags_map[AC3_3F1R] = AC3_MONO; - this->ac3_flags_map[AC3_2F2R] = AC3_MONO; - this->ac3_flags_map[AC3_3F2R] = AC3_MONO; - - this->ao_flags_map[AC3_MONO] = AO_CAP_MODE_MONO; - this->ao_flags_map[AC3_STEREO] = AO_CAP_MODE_MONO; - this->ao_flags_map[AC3_3F] = AO_CAP_MODE_MONO; - this->ao_flags_map[AC3_2F1R] = AO_CAP_MODE_MONO; - this->ao_flags_map[AC3_3F1R] = AO_CAP_MODE_MONO; - this->ao_flags_map[AC3_2F2R] = AO_CAP_MODE_MONO; - this->ao_flags_map[AC3_3F2R] = AO_CAP_MODE_MONO; - } - } - - /* - for (i = 0; i<8; i++) - this->ac3_flags_map[i] |= AC3_ADJUST_LEVEL; -*/ -#ifdef DEBUG_AC3 - ac3file = open ("test.ac3", O_CREAT | O_WRONLY | O_TRUNC, 0644); -#endif -} - -static inline int16_t blah (int32_t i) -{ - if (i > 0x43c07fff) - return 32767; - else if (i < 0x43bf8000) - return -32768; - else - return i - 0x43c00000; -} - -static inline void float_to_int (float * _f, int16_t * s16, int num_channels) { - int i; - int32_t * f = (int32_t *) _f; /* XXX assumes IEEE float format */ - - for (i = 0; i < 256; i++) { - s16[num_channels*i] = blah (f[i]); - } -} - -static void ac3dec_decode_frame (ac3dec_decoder_t *this, uint32_t pts) { - - int output_mode = AO_CAP_MODE_STEREO; - - /* - * do we want to decode this frame in software? - */ - - if (!this->bypass_mode) { - - int ac3_output_flags, i; - float level = this->ac3_level; - - /* - * oki, decode this frame in software - */ - - /* determine output mode */ - - ac3_output_flags = this->ac3_flags_map[this->ac3_flags & AC3_CHANNEL_MASK]; - - if (ac3_frame (&this->ac3_state, - this->frame_buffer, - &ac3_output_flags, - &level, 384, this->delay)) { - printf ("libac3: ac3_frame error\n"); - return; - } - - this->have_lfe = ac3_output_flags & AC3_LFE; - if (this->have_lfe) - output_mode = AO_CAP_MODE_5_1CHANNEL; - else - output_mode = this->ao_flags_map[ac3_output_flags]; - - /* - * (re-)open output device - */ - - if (!this->output_open - || (this->ac3_sample_rate != this->output_sampling_rate) - || (output_mode != this->output_mode)) { - - if (this->output_open) - this->audio_out->close (this->audio_out); - - - this->output_open = (this->audio_out->open (this->audio_out, 16, - this->ac3_sample_rate, - output_mode) == 1); - this->output_sampling_rate = this->ac3_sample_rate; - this->output_mode = output_mode; - } - - - if (!this->output_open) - return; - - - /* - * decode ac3 and convert/interleave samples - */ - - for (i = 0; i < 6; i++) { - if (ac3_block (&this->ac3_state, this->samples)) { - printf ("libac3: ac3_block error\n"); - return; - } - - switch (output_mode) { - case AO_CAP_MODE_MONO: - float_to_int (this->samples[0], this->int_samples+(i*256), 1); - break; - case AO_CAP_MODE_STEREO: - float_to_int (this->samples[0], this->int_samples+(i*256*2), 2); - float_to_int (this->samples[1], this->int_samples+(i*256*2)+1, 2); - break; - case AO_CAP_MODE_4CHANNEL: - float_to_int (this->samples[0], this->int_samples+(i*256*4), 4); /* L */ - float_to_int (this->samples[1], this->int_samples+(i*256*4)+1, 4); /* R */ - float_to_int (this->samples[2], this->int_samples+(i*256*4)+2, 4); /* RL */ - float_to_int (this->samples[3], this->int_samples+(i*256*4)+3, 4); /* RR */ - break; - case AO_CAP_MODE_5CHANNEL: - float_to_int (this->samples[0], this->int_samples+(i*256*5)+0, 5); /* L */ - float_to_int (this->samples[1], this->int_samples+(i*256*5)+4, 5); /* C */ - float_to_int (this->samples[2], this->int_samples+(i*256*5)+1, 5); /* R */ - float_to_int (this->samples[3], this->int_samples+(i*256*5)+2, 5); /* RL */ - float_to_int (this->samples[4], this->int_samples+(i*256*5)+3, 5); /* RR */ - break; - case AO_CAP_MODE_5_1CHANNEL: - float_to_int (this->samples[0], this->int_samples+(i*256*6)+5, 6); /* lfe */ - float_to_int (this->samples[1], this->int_samples+(i*256*6)+0, 6); /* L */ - float_to_int (this->samples[2], this->int_samples+(i*256*6)+4, 6); /* C */ - float_to_int (this->samples[3], this->int_samples+(i*256*6)+1, 6); /* R */ - float_to_int (this->samples[4], this->int_samples+(i*256*6)+2, 6); /* RL */ - float_to_int (this->samples[5], this->int_samples+(i*256*6)+3, 6); /* RR */ - break; - default: - printf ("libac3: help - unsupported mode %08x\n", output_mode); - } - } - - /* output decoded samples */ - - this->audio_out->write (this->audio_out, - this->int_samples, - 256*6, - pts); - pts = 0; - - } else { - - /* - * loop through ac3 data - */ - - if (!this->output_open) { - - int sample_rate, bit_rate, flags; - - ac3_syncinfo (this->frame_buffer, &flags, &sample_rate, &bit_rate); - - this->output_open = (this->audio_out->open (this->audio_out, 16, - sample_rate, - AO_CAP_MODE_AC3) == 1); - this->output_mode = AO_CAP_MODE_AC3; - } - - if (this->output_open) { - this->audio_out->write (this->audio_out, - (int16_t*)this->frame_buffer, - this->frame_length, - pts); - } - } -} - -void ac3dec_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) { - - ac3dec_decoder_t *this = (ac3dec_decoder_t *) this_gen; - uint8_t *current = buf->content; - uint8_t *end = buf->content + buf->size; - uint8_t byte; - - if (buf->decoder_info[0] == 0) - return; - - /* - printf ("libac3: got buffer, pts =%d, pts - last_pts=%d\n", - buf->PTS, buf->PTS - this->last_pts); - - this->last_pts = buf->PTS; - */ - - if (buf->PTS) - this->pts = buf->PTS; - - - while (current != end) { - - if ( (this->sync_todo == 0) && (this->frame_todo == 0) ) { - ac3dec_decode_frame (this, this->pts); -#ifdef DEBUG_AC3 - write (ac3file, this->frame_buffer, this->frame_length); -#endif - this->pts = 0; - this->sync_todo = 7; - this->syncword = 0; - } - - while (1) { - byte = *current++; - - if (this->sync_todo>0) { - - /* search and collect syncinfo */ - - if (this->syncword != 0x0b77) { - this->syncword = (this->syncword << 8) | byte; - - if (this->syncword == 0x0b77) { - - this->frame_buffer[0] = 0x0b; - this->frame_buffer[1] = 0x77; - - this->sync_todo = 5; - this->frame_ptr = this->frame_buffer+2; - } - } else { - *this->frame_ptr++ = byte; - this->sync_todo--; - - if (this->sync_todo==0) { - - this->frame_length = ac3_syncinfo (this->frame_buffer, - &this->ac3_flags, - &this->ac3_sample_rate, - &this->ac3_bit_rate); - if (this->frame_length) { - this->frame_todo = this->frame_length - 7; - } else { - this->sync_todo = 7; - this->syncword = 0; - printf ("libac3: skip frame of zero length\n"); - } - - } - - } - } else { - - *this->frame_ptr++ = byte; - this->frame_todo--; - - if (this->frame_todo == 0) { - if (current == end) - return ; - break; - } - } - - if (current == end) - return ; - } - } -} - -void ac3dec_close (audio_decoder_t *this_gen) { - - ac3dec_decoder_t *this = (ac3dec_decoder_t *) this_gen; - - if (this->output_open) - this->audio_out->close (this->audio_out); - - this->output_open = 0; - -#ifdef DEBUG_AC3 - close (ac3file); -#endif -} - -static char *ac3dec_get_id(void) { - return "ac3dec"; -} - -audio_decoder_t *init_audio_decoder_plugin (int iface_version, config_values_t *cfg) { - - ac3dec_decoder_t *this ; - - if (iface_version != 2) { - printf( "libac3: plugin doesn't support plugin API version %d.\n" - "libac3: this means there's a version mismatch between xine and this " - "libac3: decoder plugin.\nInstalling current plugins should help.\n", - iface_version); - return NULL; - } - - this = (ac3dec_decoder_t *) malloc (sizeof (ac3dec_decoder_t)); - - this->audio_decoder.interface_version = 2; - this->audio_decoder.can_handle = ac3dec_can_handle; - this->audio_decoder.init = ac3dec_init; - this->audio_decoder.decode_data = ac3dec_decode_data; - this->audio_decoder.close = ac3dec_close; - this->audio_decoder.get_identifier = ac3dec_get_id; - this->audio_decoder.priority = 1; - - - this->ac3_level = (float) cfg->lookup_int (cfg, "ac3_level", 100) / 100.0; - - return (audio_decoder_t *) this; -} - |