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785 lines
28 KiB
785 lines
28 KiB
/*****************************************************************************
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* flac.c: flac packetizer module.
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*****************************************************************************
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* Copyright (C) 1999-2001 VLC authors and VideoLAN
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* $Id$
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*
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* Authors: Gildas Bazin <gbazin@videolan.org>
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* Sigmund Augdal Helberg <dnumgis@videolan.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_codec.h>
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#include <vlc_block_helper.h>
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#include <vlc_bits.h>
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#include "packetizer_helper.h"
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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static int Open (vlc_object_t *);
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static void Close(vlc_object_t *);
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vlc_module_begin()
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set_category(CAT_SOUT)
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set_subcategory(SUBCAT_SOUT_PACKETIZER)
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set_description(N_("Flac audio packetizer"))
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set_capability("packetizer", 50)
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set_callbacks(Open, Close)
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vlc_module_end()
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/*****************************************************************************
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* decoder_sys_t : FLAC decoder descriptor
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*****************************************************************************/
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#define MAX_FLAC_HEADER_SIZE 16
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#define MIN_FLAC_FRAME_SIZE ((48+(8 + 4 + 1*4)+16)/8)
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struct decoder_sys_t
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{
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/*
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* Input properties
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*/
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int i_state;
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block_bytestream_t bytestream;
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/*
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* FLAC properties
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*/
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struct
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{
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unsigned min_blocksize, max_blocksize;
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unsigned min_framesize, max_framesize;
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unsigned sample_rate;
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unsigned channels;
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unsigned bits_per_sample;
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} stream_info;
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bool b_stream_info;
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/*
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* Common properties
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*/
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mtime_t i_pts;
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mtime_t i_duration;
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int i_frame_length;
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size_t i_frame_size;
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uint16_t crc;
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unsigned int i_rate, i_channels, i_bits_per_sample;
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size_t i_buf;
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uint8_t *p_buf;
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};
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static const int pi_channels_maps[9] =
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{
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0,
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AOUT_CHAN_CENTER,
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
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AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
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| AOUT_CHAN_REARRIGHT,
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
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| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
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| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE,
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
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| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT
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| AOUT_CHAN_MIDDLERIGHT,
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT
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| AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT
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| AOUT_CHAN_LFE
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};
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/*****************************************************************************
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* ProcessHeader: process Flac header.
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*****************************************************************************/
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static void ProcessHeader(decoder_t *p_dec)
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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bs_t bs;
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int i_extra = p_dec->fmt_in.i_extra;
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char *p_extra = p_dec->fmt_in.p_extra;
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if (i_extra > 8 && !memcmp(p_extra, "fLaC", 4)) {
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i_extra -= 8;
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p_extra += 8;
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}
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if (p_dec->fmt_in.i_extra < 14)
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return;
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bs_init(&bs, p_extra, i_extra);
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p_sys->stream_info.min_blocksize = bs_read(&bs, 16);
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p_sys->stream_info.min_blocksize =
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__MIN( __MAX( p_sys->stream_info.min_blocksize, 16 ), 65535 );
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p_sys->stream_info.max_blocksize = bs_read(&bs, 16);
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p_sys->stream_info.max_blocksize =
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__MAX( __MIN( p_sys->stream_info.max_blocksize, 65535 ), 16 );
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p_sys->stream_info.min_framesize = bs_read(&bs, 24);
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p_sys->stream_info.min_framesize =
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__MAX( p_sys->stream_info.min_framesize, MIN_FLAC_FRAME_SIZE );
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p_sys->stream_info.max_framesize = bs_read(&bs, 24);
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p_sys->stream_info.sample_rate = bs_read(&bs, 20);
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p_sys->stream_info.channels = bs_read(&bs, 3) + 1;
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p_sys->stream_info.bits_per_sample = bs_read(&bs, 5) + 1;
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p_sys->b_stream_info = true;
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p_dec->fmt_out.i_extra = i_extra;
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free(p_dec->fmt_out.p_extra);
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p_dec->fmt_out.p_extra = malloc(i_extra);
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if (p_dec->fmt_out.p_extra)
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memcpy(p_dec->fmt_out.p_extra, p_extra, i_extra);
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else
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p_dec->fmt_out.i_extra = 0;
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}
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/* Will return INT64_MAX for an invalid utf-8 sequence */
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static int64_t read_utf8(const uint8_t *p_buf, int *pi_read)
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{
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/* Max coding bits is 56 - 8 */
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/* Value max precision is 36 bits */
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int64_t i_result = 0;
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unsigned i;
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if (!(p_buf[0] & 0x80)) { /* 0xxxxxxx */
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i_result = p_buf[0];
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i = 0;
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} else if (p_buf[0] & 0xC0 && !(p_buf[0] & 0x20)) { /* 110xxxxx */
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i_result = p_buf[0] & 0x1F;
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i = 1;
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} else if (p_buf[0] & 0xE0 && !(p_buf[0] & 0x10)) { /* 1110xxxx */
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i_result = p_buf[0] & 0x0F;
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i = 2;
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} else if (p_buf[0] & 0xF0 && !(p_buf[0] & 0x08)) { /* 11110xxx */
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i_result = p_buf[0] & 0x07;
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i = 3;
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} else if (p_buf[0] & 0xF8 && !(p_buf[0] & 0x04)) { /* 111110xx */
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i_result = p_buf[0] & 0x03;
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i = 4;
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} else if (p_buf[0] & 0xFC && !(p_buf[0] & 0x02)) { /* 1111110x */
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i_result = p_buf[0] & 0x01;
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i = 5;
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} else if (p_buf[0] & 0xFE && !(p_buf[0] & 0x01)) { /* 11111110 */
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i_result = 0;
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i = 6;
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} else {
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return INT64_MAX;
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}
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for (unsigned j = 1; j <= i; j++) {
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if (!(p_buf[j] & 0x80) || (p_buf[j] & 0x40)) { /* 10xxxxxx */
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return INT64_MAX;
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}
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i_result <<= 6;
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i_result |= (p_buf[j] & 0x3F);
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}
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*pi_read = i;
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return i_result;
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}
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/* CRC-8, poly = x^8 + x^2 + x^1 + x^0, init = 0 */
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static const uint8_t flac_crc8_table[256] = {
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0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15,
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0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,
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0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65,
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0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,
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0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5,
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0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
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0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85,
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0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,
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0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2,
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0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
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0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2,
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0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
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0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32,
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0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,
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0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42,
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0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,
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0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C,
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0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
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0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC,
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0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
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0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C,
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0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,
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0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C,
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0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
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0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B,
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0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,
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0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B,
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0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,
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0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB,
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0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
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0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB,
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0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3
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};
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static uint8_t flac_crc8(const uint8_t *data, unsigned len)
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{
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uint8_t crc = 0;
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while (len--)
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crc = flac_crc8_table[crc ^ *data++];
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return crc;
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}
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/* CRC-16, poly = x^16 + x^15 + x^2 + x^0, init = 0 */
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static const uint16_t flac_crc16_table[256] = {
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0x0000, 0x8005, 0x800f, 0x000a, 0x801b, 0x001e, 0x0014, 0x8011,
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0x8033, 0x0036, 0x003c, 0x8039, 0x0028, 0x802d, 0x8027, 0x0022,
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0x8063, 0x0066, 0x006c, 0x8069, 0x0078, 0x807d, 0x8077, 0x0072,
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0x0050, 0x8055, 0x805f, 0x005a, 0x804b, 0x004e, 0x0044, 0x8041,
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0x80c3, 0x00c6, 0x00cc, 0x80c9, 0x00d8, 0x80dd, 0x80d7, 0x00d2,
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0x00f0, 0x80f5, 0x80ff, 0x00fa, 0x80eb, 0x00ee, 0x00e4, 0x80e1,
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0x00a0, 0x80a5, 0x80af, 0x00aa, 0x80bb, 0x00be, 0x00b4, 0x80b1,
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0x8093, 0x0096, 0x009c, 0x8099, 0x0088, 0x808d, 0x8087, 0x0082,
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0x8183, 0x0186, 0x018c, 0x8189, 0x0198, 0x819d, 0x8197, 0x0192,
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0x01b0, 0x81b5, 0x81bf, 0x01ba, 0x81ab, 0x01ae, 0x01a4, 0x81a1,
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0x01e0, 0x81e5, 0x81ef, 0x01ea, 0x81fb, 0x01fe, 0x01f4, 0x81f1,
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0x81d3, 0x01d6, 0x01dc, 0x81d9, 0x01c8, 0x81cd, 0x81c7, 0x01c2,
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0x0140, 0x8145, 0x814f, 0x014a, 0x815b, 0x015e, 0x0154, 0x8151,
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0x8173, 0x0176, 0x017c, 0x8179, 0x0168, 0x816d, 0x8167, 0x0162,
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0x8123, 0x0126, 0x012c, 0x8129, 0x0138, 0x813d, 0x8137, 0x0132,
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0x0110, 0x8115, 0x811f, 0x011a, 0x810b, 0x010e, 0x0104, 0x8101,
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0x8303, 0x0306, 0x030c, 0x8309, 0x0318, 0x831d, 0x8317, 0x0312,
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0x0330, 0x8335, 0x833f, 0x033a, 0x832b, 0x032e, 0x0324, 0x8321,
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0x0360, 0x8365, 0x836f, 0x036a, 0x837b, 0x037e, 0x0374, 0x8371,
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0x8353, 0x0356, 0x035c, 0x8359, 0x0348, 0x834d, 0x8347, 0x0342,
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0x03c0, 0x83c5, 0x83cf, 0x03ca, 0x83db, 0x03de, 0x03d4, 0x83d1,
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0x83f3, 0x03f6, 0x03fc, 0x83f9, 0x03e8, 0x83ed, 0x83e7, 0x03e2,
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0x83a3, 0x03a6, 0x03ac, 0x83a9, 0x03b8, 0x83bd, 0x83b7, 0x03b2,
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0x0390, 0x8395, 0x839f, 0x039a, 0x838b, 0x038e, 0x0384, 0x8381,
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0x0280, 0x8285, 0x828f, 0x028a, 0x829b, 0x029e, 0x0294, 0x8291,
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0x82b3, 0x02b6, 0x02bc, 0x82b9, 0x02a8, 0x82ad, 0x82a7, 0x02a2,
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0x82e3, 0x02e6, 0x02ec, 0x82e9, 0x02f8, 0x82fd, 0x82f7, 0x02f2,
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0x02d0, 0x82d5, 0x82df, 0x02da, 0x82cb, 0x02ce, 0x02c4, 0x82c1,
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0x8243, 0x0246, 0x024c, 0x8249, 0x0258, 0x825d, 0x8257, 0x0252,
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0x0270, 0x8275, 0x827f, 0x027a, 0x826b, 0x026e, 0x0264, 0x8261,
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0x0220, 0x8225, 0x822f, 0x022a, 0x823b, 0x023e, 0x0234, 0x8231,
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0x8213, 0x0216, 0x021c, 0x8219, 0x0208, 0x820d, 0x8207, 0x0202
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};
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static uint16_t flac_crc16(uint16_t crc, uint8_t byte)
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{
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return (crc << 8) ^ flac_crc16_table[(crc >> 8) ^ byte];
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}
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/* Gives the previous CRC value, before hashing last_byte through it */
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static uint16_t flac_crc16_undo(uint16_t crc, const uint8_t last_byte)
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{
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/*
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* Given a byte b, gives a position X in flac_crc16_table, such as:
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* flac_crc16_rev_table[flac_crc16_table[X] & 0xff] == X
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* This works because flac_crc16_table[i] & 0xff yields 256 unique values.
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*/
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static const uint8_t flac_crc16_rev_table[256] = {
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0x00, 0x7f, 0xff, 0x80, 0x7e, 0x01, 0x81, 0xfe,
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0xfc, 0x83, 0x03, 0x7c, 0x82, 0xfd, 0x7d, 0x02,
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0x78, 0x07, 0x87, 0xf8, 0x06, 0x79, 0xf9, 0x86,
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0x84, 0xfb, 0x7b, 0x04, 0xfa, 0x85, 0x05, 0x7a,
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0xf0, 0x8f, 0x0f, 0x70, 0x8e, 0xf1, 0x71, 0x0e,
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0x0c, 0x73, 0xf3, 0x8c, 0x72, 0x0d, 0x8d, 0xf2,
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0x88, 0xf7, 0x77, 0x08, 0xf6, 0x89, 0x09, 0x76,
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0x74, 0x0b, 0x8b, 0xf4, 0x0a, 0x75, 0xf5, 0x8a,
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0x60, 0x1f, 0x9f, 0xe0, 0x1e, 0x61, 0xe1, 0x9e,
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0x9c, 0xe3, 0x63, 0x1c, 0xe2, 0x9d, 0x1d, 0x62,
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0x18, 0x67, 0xe7, 0x98, 0x66, 0x19, 0x99, 0xe6,
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0xe4, 0x9b, 0x1b, 0x64, 0x9a, 0xe5, 0x65, 0x1a,
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0x90, 0xef, 0x6f, 0x10, 0xee, 0x91, 0x11, 0x6e,
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0x6c, 0x13, 0x93, 0xec, 0x12, 0x6d, 0xed, 0x92,
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0xe8, 0x97, 0x17, 0x68, 0x96, 0xe9, 0x69, 0x16,
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0x14, 0x6b, 0xeb, 0x94, 0x6a, 0x15, 0x95, 0xea,
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0xc0, 0xbf, 0x3f, 0x40, 0xbe, 0xc1, 0x41, 0x3e,
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0x3c, 0x43, 0xc3, 0xbc, 0x42, 0x3d, 0xbd, 0xc2,
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0xb8, 0xc7, 0x47, 0x38, 0xc6, 0xb9, 0x39, 0x46,
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0x44, 0x3b, 0xbb, 0xc4, 0x3a, 0x45, 0xc5, 0xba,
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0x30, 0x4f, 0xcf, 0xb0, 0x4e, 0x31, 0xb1, 0xce,
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0xcc, 0xb3, 0x33, 0x4c, 0xb2, 0xcd, 0x4d, 0x32,
|
|
0x48, 0x37, 0xb7, 0xc8, 0x36, 0x49, 0xc9, 0xb6,
|
|
0xb4, 0xcb, 0x4b, 0x34, 0xca, 0xb5, 0x35, 0x4a,
|
|
0xa0, 0xdf, 0x5f, 0x20, 0xde, 0xa1, 0x21, 0x5e,
|
|
0x5c, 0x23, 0xa3, 0xdc, 0x22, 0x5d, 0xdd, 0xa2,
|
|
0xd8, 0xa7, 0x27, 0x58, 0xa6, 0xd9, 0x59, 0x26,
|
|
0x24, 0x5b, 0xdb, 0xa4, 0x5a, 0x25, 0xa5, 0xda,
|
|
0x50, 0x2f, 0xaf, 0xd0, 0x2e, 0x51, 0xd1, 0xae,
|
|
0xac, 0xd3, 0x53, 0x2c, 0xd2, 0xad, 0x2d, 0x52,
|
|
0x28, 0x57, 0xd7, 0xa8, 0x56, 0x29, 0xa9, 0xd6,
|
|
0xd4, 0xab, 0x2b, 0x54, 0xaa, 0xd5, 0x55, 0x2a,
|
|
};
|
|
uint8_t idx = flac_crc16_rev_table[crc & 0xff];
|
|
return ((idx ^ last_byte) << 8) | ((crc ^ flac_crc16_table[idx]) >> 8);
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* SyncInfo: parse FLAC sync info
|
|
*****************************************************************************/
|
|
static int SyncInfo(decoder_t *p_dec, uint8_t *p_buf,
|
|
unsigned int * pi_channels,
|
|
unsigned int * pi_sample_rate,
|
|
unsigned int * pi_bits_per_sample,
|
|
mtime_t * pi_pts,
|
|
mtime_t * pi_duration )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
|
|
/* Check syncword */
|
|
if (p_buf[0] != 0xFF || (p_buf[1] & 0xFE) != 0xF8)
|
|
return 0;
|
|
|
|
/* Check there is no emulated sync code in the rest of the header */
|
|
if (p_buf[2] == 0xff || p_buf[3] == 0xFF)
|
|
return 0;
|
|
|
|
/* Find blocksize (framelength) */
|
|
int blocksize_hint = 0;
|
|
unsigned blocksize = p_buf[2] >> 4;
|
|
if (blocksize >= 8) {
|
|
blocksize = 256 << (blocksize - 8);
|
|
} else if (blocksize == 0) { /* value 0 is reserved */
|
|
if (p_sys->b_stream_info &&
|
|
p_sys->stream_info.min_blocksize == p_sys->stream_info.max_blocksize)
|
|
blocksize = p_sys->stream_info.min_blocksize;
|
|
else
|
|
return 0; /* We can't do anything with this */
|
|
} else if (blocksize == 1) {
|
|
blocksize = 192;
|
|
} else if (blocksize == 6 || blocksize == 7) {
|
|
blocksize_hint = blocksize;
|
|
blocksize = 0;
|
|
} else /* 2, 3, 4, 5 */ {
|
|
blocksize = 576 << (blocksize - 2);
|
|
}
|
|
|
|
if (p_sys->b_stream_info && !blocksize_hint )
|
|
if (blocksize < p_sys->stream_info.min_blocksize ||
|
|
blocksize > p_sys->stream_info.max_blocksize)
|
|
return 0;
|
|
|
|
/* Find samplerate */
|
|
int samplerate_hint = p_buf[2] & 0xf;;
|
|
unsigned int samplerate;
|
|
if (samplerate_hint == 0) {
|
|
if (p_sys->b_stream_info)
|
|
samplerate = p_sys->stream_info.sample_rate;
|
|
else
|
|
return 0; /* We can't do anything with this */
|
|
} else if (samplerate_hint == 15) {
|
|
return 0; /* invalid */
|
|
} else if (samplerate_hint < 12) {
|
|
static const int16_t flac_samplerate[12] = {
|
|
0, 8820, 17640, 19200,
|
|
800, 1600, 2205, 2400,
|
|
3200, 4410, 4800, 9600,
|
|
};
|
|
samplerate = flac_samplerate[samplerate_hint] * 10;
|
|
} else {
|
|
samplerate = 0; /* at end of header */
|
|
}
|
|
|
|
/* Find channels */
|
|
unsigned channels = p_buf[3] >> 4;
|
|
if (channels >= 8) {
|
|
if (channels >= 11) /* reserved */
|
|
return 0;
|
|
channels = 2;
|
|
} else
|
|
channels++;
|
|
|
|
|
|
/* Find bits per sample */
|
|
static const int8_t flac_bits_per_sample[8] = {
|
|
0, 8, 12, -1, 16, 20, 24, -1
|
|
};
|
|
int bits_per_sample = flac_bits_per_sample[(p_buf[3] & 0x0e) >> 1];
|
|
if (bits_per_sample == 0) {
|
|
if (p_sys->b_stream_info)
|
|
bits_per_sample = p_sys->stream_info.bits_per_sample;
|
|
else
|
|
return 0;
|
|
} else if (bits_per_sample < 0)
|
|
return 0;
|
|
|
|
|
|
/* reserved for future use */
|
|
if (p_buf[3] & 0x01)
|
|
return 0;
|
|
|
|
/* End of fixed size header */
|
|
int i_header = 4;
|
|
|
|
/* Check Sample/Frame number */
|
|
int i_read;
|
|
int64_t i_fsnumber = read_utf8(&p_buf[i_header++], &i_read);
|
|
if ( i_fsnumber == INT64_MAX )
|
|
return 0;
|
|
|
|
i_header += i_read;
|
|
|
|
/* Read blocksize */
|
|
if (blocksize_hint) {
|
|
blocksize = p_buf[i_header++];
|
|
if (blocksize_hint == 7) {
|
|
blocksize <<= 8;
|
|
blocksize |= p_buf[i_header++];
|
|
}
|
|
blocksize++;
|
|
}
|
|
|
|
/* Read sample rate */
|
|
if (samplerate == 0) {
|
|
samplerate = p_buf[i_header++];
|
|
if (samplerate_hint != 12) { /* 16 bits */
|
|
samplerate <<= 8;
|
|
samplerate |= p_buf[i_header++];
|
|
}
|
|
|
|
if (samplerate_hint == 12)
|
|
samplerate *= 1000;
|
|
else if (samplerate_hint == 14)
|
|
samplerate *= 10;
|
|
}
|
|
|
|
if ( !samplerate )
|
|
return 0;
|
|
|
|
/* Check the CRC-8 byte */
|
|
if (flac_crc8(p_buf, i_header) != p_buf[i_header])
|
|
return 0;
|
|
|
|
/* Sanity check using stream info header when possible */
|
|
if (p_sys->b_stream_info) {
|
|
if (blocksize < p_sys->stream_info.min_blocksize ||
|
|
blocksize > p_sys->stream_info.max_blocksize)
|
|
return 0;
|
|
if ((unsigned)bits_per_sample != p_sys->stream_info.bits_per_sample)
|
|
return 0;
|
|
if (samplerate != p_sys->stream_info.sample_rate)
|
|
return 0;
|
|
}
|
|
|
|
if( pi_pts )
|
|
{
|
|
*pi_pts = VLC_TS_0;
|
|
if ( (p_buf[1] & 0x01) == 0 ) /* Fixed blocksize stream / Frames */
|
|
*pi_pts += CLOCK_FREQ * blocksize * i_fsnumber / samplerate;
|
|
else /* Variable blocksize stream / Samples */
|
|
*pi_pts += CLOCK_FREQ * i_fsnumber / samplerate;
|
|
}
|
|
|
|
if ( pi_duration )
|
|
*pi_duration = CLOCK_FREQ * blocksize / samplerate;
|
|
|
|
*pi_bits_per_sample = bits_per_sample;
|
|
*pi_sample_rate = samplerate;
|
|
*pi_channels = channels;
|
|
|
|
return blocksize;
|
|
}
|
|
|
|
/* */
|
|
static block_t *Packetize(decoder_t *p_dec, block_t **pp_block)
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
uint8_t p_header[MAX_FLAC_HEADER_SIZE];
|
|
block_t *out, *in = NULL;
|
|
|
|
if ( pp_block && *pp_block)
|
|
{
|
|
in = *pp_block;
|
|
|
|
if (in->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED)) {
|
|
if (in->i_flags&BLOCK_FLAG_CORRUPTED) {
|
|
p_sys->i_state = STATE_NOSYNC;
|
|
block_BytestreamEmpty(&p_sys->bytestream);
|
|
}
|
|
block_Release(*pp_block);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
if (!p_sys->b_stream_info)
|
|
ProcessHeader(p_dec);
|
|
|
|
if (p_sys->stream_info.channels > 8) {
|
|
msg_Err(p_dec, "This stream uses too many audio channels (%d > 8)",
|
|
p_sys->stream_info.channels);
|
|
return NULL;
|
|
}
|
|
|
|
if ( p_sys->i_pts <= VLC_TS_INVALID )
|
|
{
|
|
if ( in && in->i_pts == p_sys->i_pts )
|
|
{
|
|
/* We've just started the stream, wait for the first PTS. */
|
|
block_Release(in);
|
|
return NULL;
|
|
}
|
|
p_sys->i_rate = p_dec->fmt_out.audio.i_rate;
|
|
}
|
|
|
|
if ( in )
|
|
block_BytestreamPush(&p_sys->bytestream, in);
|
|
|
|
while (1) switch (p_sys->i_state) {
|
|
case STATE_NOSYNC:
|
|
while (!block_PeekBytes(&p_sys->bytestream, p_header, 2)) {
|
|
if (p_header[0] == 0xFF && (p_header[1] & 0xFE) == 0xF8) {
|
|
p_sys->i_state = STATE_SYNC;
|
|
break;
|
|
}
|
|
block_SkipByte(&p_sys->bytestream);
|
|
}
|
|
if (p_sys->i_state != STATE_SYNC) {
|
|
block_BytestreamFlush(&p_sys->bytestream);
|
|
return NULL; /* Need more data */
|
|
}
|
|
|
|
case STATE_SYNC:
|
|
/* Sync state is unverified until we have read frame header and checked CRC
|
|
Once validated, we'll send data from NEXT_SYNC state where we'll
|
|
compute frame size */
|
|
p_sys->i_state = STATE_HEADER;
|
|
|
|
case STATE_HEADER:
|
|
/* Get FLAC frame header (MAX_FLAC_HEADER_SIZE bytes) */
|
|
if (block_PeekBytes(&p_sys->bytestream, p_header, MAX_FLAC_HEADER_SIZE))
|
|
return NULL; /* Need more data */
|
|
|
|
/* Check if frame is valid and get frame info */
|
|
p_sys->i_frame_length = SyncInfo(p_dec, p_header,
|
|
&p_sys->i_channels,
|
|
&p_sys->i_rate,
|
|
&p_sys->i_bits_per_sample,
|
|
&p_sys->i_pts,
|
|
&p_sys->i_duration );
|
|
if (!p_sys->i_frame_length) {
|
|
msg_Dbg(p_dec, "emulated sync word");
|
|
block_SkipByte(&p_sys->bytestream);
|
|
p_sys->i_state = STATE_NOSYNC;
|
|
break;
|
|
}
|
|
if (p_sys->i_rate != p_dec->fmt_out.audio.i_rate) {
|
|
p_dec->fmt_out.audio.i_rate = p_sys->i_rate;
|
|
}
|
|
p_sys->i_state = STATE_NEXT_SYNC;
|
|
p_sys->i_frame_size = ( p_sys->b_stream_info ) ? p_sys->stream_info.min_framesize :
|
|
MIN_FLAC_FRAME_SIZE;
|
|
|
|
/* We have to read until next frame sync code to compute current frame size
|
|
* from that boundary.
|
|
* The confusing part below is that sync code needs to be verified in case
|
|
* it would appear in data, so we also need to check next frame header CRC
|
|
*/
|
|
case STATE_NEXT_SYNC:
|
|
{
|
|
/* Calculate the initial CRC for the minimal frame size,
|
|
* We'll update it as we look for the next start code. */
|
|
if (p_sys->i_buf < p_sys->i_frame_size)
|
|
{
|
|
uint8_t *p_buf = realloc(p_sys->p_buf, p_sys->i_frame_size);
|
|
if (!p_buf)
|
|
return NULL;
|
|
p_sys->p_buf = p_buf;
|
|
p_sys->i_buf = p_sys->i_frame_size;
|
|
}
|
|
|
|
if (block_PeekOffsetBytes(&p_sys->bytestream, 0, p_sys->p_buf, p_sys->i_frame_size)) {
|
|
return NULL;
|
|
}
|
|
|
|
uint16_t crc = 0;
|
|
for (unsigned i = 0; i < p_sys->i_frame_size; i++)
|
|
crc = flac_crc16(crc, p_sys->p_buf[i]);
|
|
p_sys->crc = crc;
|
|
|
|
/* Check if next expected frame contains the sync word */
|
|
while (!block_PeekOffsetBytes(&p_sys->bytestream, p_sys->i_frame_size,
|
|
p_header, MAX_FLAC_HEADER_SIZE)) {
|
|
if (p_header[0] == 0xFF && (p_header[1] & 0xFE) == 0xF8) {
|
|
/* Check if frame is valid and get frame info */
|
|
int i_frame_length =
|
|
SyncInfo(p_dec, p_header,
|
|
&p_sys->i_channels,
|
|
&p_sys->i_rate,
|
|
&p_sys->i_bits_per_sample,
|
|
NULL, NULL );
|
|
|
|
if (i_frame_length) {
|
|
uint8_t crc_bytes[2];
|
|
block_PeekOffsetBytes(&p_sys->bytestream,
|
|
p_sys->i_frame_size - 2, crc_bytes, 2);
|
|
/* Get the frame CRC */
|
|
uint16_t stream_crc = (crc_bytes[0] << 8) | crc_bytes[1];
|
|
/* Calculate the frame CRC: remove the last 2 bytes */
|
|
uint16_t crc = flac_crc16_undo(p_sys->crc, crc_bytes[1]);
|
|
crc = flac_crc16_undo(crc, crc_bytes[0]);
|
|
if (stream_crc != crc) {
|
|
msg_Warn(p_dec, "Bad CRC for frame size %zu: 0x%x != 0x%x",
|
|
p_sys->i_frame_size, crc, stream_crc);
|
|
block_SkipByte(&p_sys->bytestream);
|
|
p_sys->i_state = STATE_NOSYNC;
|
|
} else {
|
|
p_sys->i_state = STATE_SEND_DATA;
|
|
p_sys->crc = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
p_sys->crc = flac_crc16(p_sys->crc, p_header[0]); /* update CRC */
|
|
p_sys->i_frame_size++;
|
|
}
|
|
|
|
if (p_sys->i_state != STATE_SEND_DATA) {
|
|
if (p_sys->b_stream_info && p_sys->stream_info.max_framesize > 0 &&
|
|
p_sys->i_frame_size > p_sys->stream_info.max_framesize) {
|
|
block_SkipByte(&p_sys->bytestream);
|
|
msg_Warn(p_dec, "Frame is too big (%zu > %d), couldn't find start code",
|
|
p_sys->i_frame_size, p_sys->stream_info.max_framesize);
|
|
p_sys->i_state = STATE_NOSYNC;
|
|
return NULL;
|
|
}
|
|
|
|
if ( !in )
|
|
{
|
|
/* There's no following frame, so we need to read current
|
|
* data until the frame footer matches (crc16) == stream crc.
|
|
* In the worst case, if crc might be a false positive and data
|
|
* will be truncated. */
|
|
uint8_t crc_bytes[2];
|
|
if ( !block_PeekOffsetBytes(&p_sys->bytestream,
|
|
p_sys->i_frame_size - 2, crc_bytes, 2) )
|
|
{
|
|
while ( true )
|
|
{
|
|
/* Read the frame CRC */
|
|
uint16_t stream_crc = (crc_bytes[0] << 8) | crc_bytes[1];
|
|
/* Calculate the frame CRC: remove the last 2 bytes */
|
|
uint16_t crc = flac_crc16_undo(p_sys->crc, crc_bytes[1]);
|
|
crc = flac_crc16_undo(crc, crc_bytes[0]);
|
|
if (stream_crc == crc)
|
|
{
|
|
p_sys->i_state = STATE_SEND_DATA;
|
|
break;
|
|
}
|
|
p_sys->i_frame_size++;
|
|
if ( block_PeekOffsetBytes(&p_sys->bytestream,
|
|
p_sys->i_frame_size - 2, crc_bytes, 2) )
|
|
break;
|
|
/* Update current crc */
|
|
p_sys->crc = flac_crc16(p_sys->crc, crc_bytes[1]);
|
|
}
|
|
}
|
|
|
|
if ( p_sys->i_state != STATE_SEND_DATA )
|
|
return NULL;
|
|
}
|
|
else
|
|
{
|
|
/* Need more data */
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
case STATE_SEND_DATA:
|
|
out = block_Alloc(p_sys->i_frame_size);
|
|
|
|
/* Copy the whole frame into the buffer. When we reach this point
|
|
* we already know we have enough data available. */
|
|
block_GetBytes(&p_sys->bytestream, out->p_buffer,
|
|
p_sys->i_frame_size);
|
|
|
|
p_dec->fmt_out.audio.i_channels = p_sys->i_channels;
|
|
p_dec->fmt_out.audio.i_physical_channels =
|
|
p_dec->fmt_out.audio.i_original_channels =
|
|
pi_channels_maps[p_sys->stream_info.channels];
|
|
|
|
/* So p_block doesn't get re-added several times */
|
|
if ( in )
|
|
*pp_block = block_BytestreamPop(&p_sys->bytestream);
|
|
else
|
|
block_BytestreamFlush(&p_sys->bytestream);
|
|
|
|
p_sys->i_state = STATE_NOSYNC;
|
|
|
|
out->i_dts = out->i_pts = p_sys->i_pts;
|
|
out->i_length = p_sys->i_duration;
|
|
|
|
return out;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int Open(vlc_object_t *p_this)
|
|
{
|
|
decoder_t *p_dec = (decoder_t*)p_this;
|
|
decoder_sys_t *p_sys;
|
|
|
|
if (p_dec->fmt_in.i_codec != VLC_CODEC_FLAC)
|
|
return VLC_EGENERIC;
|
|
|
|
/* */
|
|
p_dec->p_sys = p_sys = malloc(sizeof(*p_sys));
|
|
if (!p_sys)
|
|
return VLC_ENOMEM;
|
|
|
|
p_sys->i_state = STATE_NOSYNC;
|
|
p_sys->b_stream_info = false;
|
|
p_sys->i_pts = VLC_TS_INVALID;
|
|
p_sys->i_buf = 0;
|
|
p_sys->p_buf = NULL;
|
|
block_BytestreamInit(&p_sys->bytestream);
|
|
|
|
/* */
|
|
es_format_Copy(&p_dec->fmt_out, &p_dec->fmt_in);
|
|
p_dec->fmt_out.i_cat = AUDIO_ES;
|
|
p_dec->fmt_out.i_codec = VLC_CODEC_FLAC;
|
|
|
|
/* */
|
|
p_dec->pf_decode_audio = NULL;
|
|
p_dec->pf_packetize = Packetize;
|
|
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
static void Close(vlc_object_t *p_this)
|
|
{
|
|
decoder_t *p_dec = (decoder_t *)p_this;
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
|
|
es_format_Clean(&p_dec->fmt_out);
|
|
block_BytestreamRelease(&p_sys->bytestream);
|
|
free(p_sys->p_buf);
|
|
free(p_sys);
|
|
}
|
|
|