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627 lines
23 KiB
627 lines
23 KiB
/*****************************************************************************
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* flac.c: flac packetizer module.
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*****************************************************************************
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* Copyright (C) 1999-2017 VLC authors and VideoLAN
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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 "packetizer_helper.h"
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#include "flac.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_subcategory(SUBCAT_SOUT_PACKETIZER)
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set_description(N_("Flac audio packetizer"))
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set_capability("audio 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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typedef struct
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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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size_t i_offset;
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/*
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* FLAC properties
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*/
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struct flac_stream_info 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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date_t pts;
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struct flac_header_info headerinfo;
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size_t i_last_frame_size;
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uint16_t crc;
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size_t i_buf_offset; /* in final buffer before crc check / validation / retry */
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size_t i_buf;
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uint8_t *p_buf;
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int i_next_block_flags;
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} decoder_sys_t;
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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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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 (i_extra < FLAC_STREAMINFO_SIZE)
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return;
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FLAC_ParseStreamInfo( (uint8_t *) p_extra, &p_sys->stream_info );
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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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/* 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, size_t 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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#if 0
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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,
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0x48, 0x37, 0xb7, 0xc8, 0x36, 0x49, 0xc9, 0xb6,
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0xb4, 0xcb, 0x4b, 0x34, 0xca, 0xb5, 0x35, 0x4a,
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0xa0, 0xdf, 0x5f, 0x20, 0xde, 0xa1, 0x21, 0x5e,
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0x5c, 0x23, 0xa3, 0xdc, 0x22, 0x5d, 0xdd, 0xa2,
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0xd8, 0xa7, 0x27, 0x58, 0xa6, 0xd9, 0x59, 0x26,
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0x24, 0x5b, 0xdb, 0xa4, 0x5a, 0x25, 0xa5, 0xda,
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0x50, 0x2f, 0xaf, 0xd0, 0x2e, 0x51, 0xd1, 0xae,
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0xac, 0xd3, 0x53, 0x2c, 0xd2, 0xad, 0x2d, 0x52,
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0x28, 0x57, 0xd7, 0xa8, 0x56, 0x29, 0xa9, 0xd6,
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0xd4, 0xab, 0x2b, 0x54, 0xaa, 0xd5, 0x55, 0x2a,
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};
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uint8_t idx = flac_crc16_rev_table[crc & 0xff];
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return ((idx ^ last_byte) << 8) | ((crc ^ flac_crc16_table[idx]) >> 8);
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}
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#endif
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static void Flush(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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p_sys->i_state = STATE_NOSYNC;
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p_sys->i_offset = 0;
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date_Set( &p_sys->pts, VLC_TICK_INVALID );
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block_BytestreamEmpty(&p_sys->bytestream);
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}
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static const uint8_t * FLACStartcodeHelper(const uint8_t *p, const uint8_t *end)
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{
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while( p && p < end )
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{
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if( (p = memchr(p, 0xFF, end - p)) )
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{
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if( end - p > 1 && (p[1] & 0xFE) == 0xF8 )
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return p;
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else
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p++;
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}
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}
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return NULL;
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}
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static bool FLACStartcodeMatcher(uint8_t i, size_t i_pos, const uint8_t *p_startcode)
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{
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VLC_UNUSED(p_startcode);
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return (i_pos == 0) ? i == 0xFF : (i & 0xFE) == 0xF8;
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}
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/* */
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static block_t *Packetize(decoder_t *p_dec, block_t **pp_block)
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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uint8_t p_header[FLAC_HEADER_SIZE_MAX];
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block_t *out = NULL, *in = NULL;
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if ( pp_block && *pp_block)
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{
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in = *pp_block;
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*pp_block = NULL;
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if (in->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED)) {
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Flush(p_dec);
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p_sys->i_next_block_flags |= BLOCK_FLAG_DISCONTINUITY;
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if (in->i_flags&BLOCK_FLAG_CORRUPTED) {
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block_Release(in);
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return NULL;
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}
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}
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}
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if (!p_sys->b_stream_info)
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ProcessHeader(p_dec);
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|
|
if (p_sys->stream_info.channels > 8)
|
|
{
|
|
if(in)
|
|
block_Release(in);
|
|
msg_Err(p_dec, "This stream uses too many audio channels (%d > 8)",
|
|
p_sys->stream_info.channels);
|
|
return NULL;
|
|
}
|
|
|
|
if ( in )
|
|
block_BytestreamPush(&p_sys->bytestream, in);
|
|
|
|
while (1) switch (p_sys->i_state) {
|
|
case STATE_NOSYNC:
|
|
if(block_FindStartcodeFromOffset(&p_sys->bytestream, &p_sys->i_offset,
|
|
NULL, 2,
|
|
FLACStartcodeHelper,
|
|
FLACStartcodeMatcher) == VLC_SUCCESS)
|
|
{
|
|
p_sys->i_state = STATE_SYNC;
|
|
}
|
|
|
|
/* First Sync is now on bytestream head, offset == 0 */
|
|
block_SkipBytes(&p_sys->bytestream, p_sys->i_offset);
|
|
block_BytestreamFlush(&p_sys->bytestream);
|
|
p_sys->i_offset = 0;
|
|
|
|
if( p_sys->i_state != STATE_SYNC )
|
|
return NULL; /* Need more data */
|
|
/* fallthrough */
|
|
|
|
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;
|
|
/* fallthrough */
|
|
|
|
case STATE_HEADER:
|
|
{
|
|
/* Get FLAC frame header (MAX_FLAC_HEADER_SIZE bytes) */
|
|
if (block_PeekBytes(&p_sys->bytestream, p_header, FLAC_HEADER_SIZE_MAX))
|
|
return NULL; /* Need more data */
|
|
|
|
/* Check if frame is valid and get frame info */
|
|
const struct flac_stream_info *streaminfo =
|
|
p_sys->b_stream_info ? &p_sys->stream_info : NULL;
|
|
struct flac_header_info headerinfo;
|
|
int i_ret = FLAC_ParseSyncInfo(p_header, FLAC_HEADER_SIZE_MAX, streaminfo,
|
|
flac_crc8, &headerinfo);
|
|
if (!i_ret || !FLAC_CheckFrameInfo(streaminfo, &headerinfo)) {
|
|
msg_Dbg(p_dec, "emulated sync word");
|
|
block_SkipByte(&p_sys->bytestream);
|
|
p_sys->i_offset = 0;
|
|
p_sys->i_state = STATE_NOSYNC;
|
|
break;
|
|
}
|
|
|
|
p_sys->headerinfo = headerinfo;
|
|
p_sys->i_state = STATE_NEXT_SYNC;
|
|
p_sys->i_offset = FLAC_FRAME_SIZE_MIN;
|
|
p_sys->i_buf_offset = 0;
|
|
p_sys->crc = 0;
|
|
|
|
/* 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
|
|
*/
|
|
}
|
|
/* fallthrough */
|
|
|
|
case STATE_NEXT_SYNC:
|
|
{
|
|
/* First Sync is on bytestream head, offset will be the position
|
|
* of the next sync code candidate */
|
|
if(block_FindStartcodeFromOffset(&p_sys->bytestream, &p_sys->i_offset,
|
|
NULL, 2,
|
|
FLACStartcodeHelper,
|
|
FLACStartcodeMatcher) != VLC_SUCCESS)
|
|
{
|
|
size_t i_remain = block_BytestreamRemaining( &p_sys->bytestream );
|
|
if( pp_block == NULL && i_remain > FLAC_FRAME_SIZE_MIN ) /* EOF/Drain */
|
|
{
|
|
/* There is no other synccode in the bytestream,
|
|
* we assume the end of our flac frame is end of bytestream */
|
|
p_sys->i_offset = i_remain;
|
|
p_sys->i_state = STATE_GET_DATA;
|
|
continue;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* Check next header */
|
|
uint8_t nextheader[FLAC_HEADER_SIZE_MAX];
|
|
if (block_PeekOffsetBytes(&p_sys->bytestream, p_sys->i_offset,
|
|
nextheader, FLAC_HEADER_SIZE_MAX))
|
|
return NULL; /* Need more data */
|
|
|
|
const struct flac_stream_info *streaminfo =
|
|
p_sys->b_stream_info ? &p_sys->stream_info : NULL;
|
|
struct flac_header_info dummy;
|
|
/* Check if frame is valid and get frame info */
|
|
if(!FLAC_ParseSyncInfo(nextheader, FLAC_HEADER_SIZE_MAX, streaminfo, NULL, &dummy)||
|
|
!FLAC_CheckFrameInfo(streaminfo, &dummy))
|
|
{
|
|
/* Keep trying to find next sync point in bytestream */
|
|
p_sys->i_offset++;
|
|
continue;
|
|
}
|
|
|
|
p_sys->i_state = STATE_GET_DATA;
|
|
continue;
|
|
}
|
|
|
|
case STATE_GET_DATA:
|
|
/* i_offset is the next sync point candidate
|
|
* our frame_size is the offset from the first sync */
|
|
if( pp_block != NULL &&
|
|
p_sys->b_stream_info &&
|
|
p_sys->stream_info.min_framesize > p_sys->i_offset )
|
|
{
|
|
p_sys->i_offset += 1;
|
|
p_sys->i_state = STATE_NEXT_SYNC;
|
|
break;
|
|
}
|
|
else if( p_sys->b_stream_info &&
|
|
p_sys->stream_info.max_framesize > FLAC_FRAME_SIZE_MIN &&
|
|
p_sys->stream_info.max_framesize < p_sys->i_offset )
|
|
{
|
|
/* Something went wrong, truncate stream head and restart */
|
|
msg_Warn(p_dec, "discarding bytes as we're over framesize %u, %zu",
|
|
p_sys->stream_info.max_framesize,
|
|
p_sys->i_offset);
|
|
if( block_SkipBytes( &p_sys->bytestream,
|
|
FLAC_HEADER_SIZE_MAX + 2 ) != VLC_SUCCESS )
|
|
return NULL;
|
|
block_BytestreamFlush( &p_sys->bytestream );
|
|
p_sys->crc = 0;
|
|
p_sys->i_buf_offset = 0;
|
|
p_sys->i_offset = 0;
|
|
p_sys->i_state = STATE_NOSYNC;
|
|
p_sys->i_next_block_flags |= BLOCK_FLAG_DISCONTINUITY;
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
/* Allocate enough for storage */
|
|
if( p_sys->i_offset > p_sys->i_buf )
|
|
{
|
|
size_t i_min_alloc = __MAX(p_sys->i_last_frame_size, p_sys->i_offset);
|
|
uint8_t *p_realloc = realloc( p_sys->p_buf, i_min_alloc );
|
|
if( p_realloc )
|
|
{
|
|
p_sys->i_buf = i_min_alloc;
|
|
p_sys->p_buf = p_realloc;
|
|
}
|
|
|
|
if ( !p_sys->p_buf )
|
|
return NULL;
|
|
}
|
|
|
|
/* Copy from previous sync point up to to current (offset) */
|
|
if( block_PeekOffsetBytes( &p_sys->bytestream, p_sys->i_buf_offset,
|
|
&p_sys->p_buf[p_sys->i_buf_offset],
|
|
p_sys->i_offset - p_sys->i_buf_offset ))
|
|
return NULL;
|
|
|
|
/* update crc to include this data chunk */
|
|
for( size_t i = p_sys->i_buf_offset; i < p_sys->i_offset - 2; i++ )
|
|
p_sys->crc = flac_crc16( p_sys->crc, p_sys->p_buf[i] );
|
|
|
|
uint16_t stream_crc = GetWBE(&p_sys->p_buf[p_sys->i_offset - 2]);
|
|
if( stream_crc != p_sys->crc )
|
|
{
|
|
/* False positive syncpoint as the CRC does not match */
|
|
/* Add the 2 last bytes which were not the CRC sum, and go for next sync point */
|
|
p_sys->crc = flac_crc16( p_sys->crc, p_sys->p_buf[p_sys->i_offset - 2] );
|
|
p_sys->crc = flac_crc16( p_sys->crc, p_sys->p_buf[p_sys->i_offset - 1] );
|
|
p_sys->i_buf_offset = p_sys->i_offset;
|
|
p_sys->i_offset += 1;
|
|
p_sys->i_state = !pp_block ? STATE_NOSYNC : STATE_NEXT_SYNC;
|
|
break; /* continue */
|
|
}
|
|
|
|
p_sys->i_state = STATE_SEND_DATA;
|
|
|
|
/* frame size between the two sync codes is now known */
|
|
p_sys->i_last_frame_size = p_sys->i_offset;
|
|
p_sys->i_buf = p_sys->i_offset;
|
|
|
|
/* clean */
|
|
block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
|
|
block_BytestreamFlush( &p_sys->bytestream );
|
|
p_sys->i_offset = 0;
|
|
p_sys->crc = 0;
|
|
p_sys->i_buf_offset = 0;
|
|
|
|
if( block_BytestreamRemaining(&p_sys->bytestream) > 0 || pp_block == NULL /* drain */)
|
|
p_sys->i_state = STATE_SEND_DATA;
|
|
else
|
|
p_sys->i_state = STATE_NOSYNC;
|
|
}
|
|
break;
|
|
|
|
case STATE_SEND_DATA:
|
|
p_dec->fmt_out.audio.i_rate = p_sys->headerinfo.i_rate;
|
|
p_dec->fmt_out.audio.i_channels = p_sys->headerinfo.i_channels;
|
|
p_dec->fmt_out.audio.i_physical_channels = pi_channels_maps[p_sys->stream_info.channels];
|
|
|
|
if( p_sys->bytestream.p_block &&
|
|
p_sys->bytestream.p_block->i_pts > date_Get( &p_sys->pts ) &&
|
|
p_sys->bytestream.p_block->i_pts != VLC_TICK_INVALID )
|
|
{
|
|
date_Init( &p_sys->pts, p_sys->headerinfo.i_rate, 1 );
|
|
date_Set( &p_sys->pts, p_sys->bytestream.p_block->i_pts );
|
|
p_sys->bytestream.p_block->i_pts = VLC_TICK_INVALID;
|
|
}
|
|
|
|
|
|
out = block_heap_Alloc( p_sys->p_buf, p_sys->i_buf );
|
|
if( out )
|
|
{
|
|
out->i_dts = out->i_pts = date_Get( &p_sys->pts );
|
|
out->i_flags = p_sys->i_next_block_flags;
|
|
p_sys->i_next_block_flags = 0;
|
|
}
|
|
else
|
|
p_sys->p_buf = NULL;
|
|
|
|
date_Increment( &p_sys->pts, p_sys->headerinfo.i_frame_length );
|
|
if( out )
|
|
out->i_length = date_Get( &p_sys->pts ) - out->i_pts;
|
|
else
|
|
free( p_sys->p_buf );
|
|
|
|
p_sys->i_buf_offset = 0;
|
|
p_sys->i_buf = 0;
|
|
p_sys->p_buf = NULL;
|
|
p_sys->i_offset = 0;
|
|
p_sys->i_state = STATE_NOSYNC;
|
|
|
|
/* So p_block doesn't get re-added several times */
|
|
if ( pp_block )
|
|
*pp_block = block_BytestreamPop(&p_sys->bytestream);
|
|
|
|
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->i_offset = 0;
|
|
p_sys->b_stream_info = false;
|
|
p_sys->i_last_frame_size = FLAC_FRAME_SIZE_MIN;
|
|
p_sys->headerinfo.i_pts = VLC_TICK_INVALID;
|
|
p_sys->i_buf_offset = 0;
|
|
p_sys->i_buf = 0;
|
|
p_sys->p_buf = NULL;
|
|
p_sys->i_next_block_flags = 0;
|
|
block_BytestreamInit(&p_sys->bytestream);
|
|
date_Init( &p_sys->pts, 1, 1 );
|
|
|
|
/* */
|
|
es_format_Copy(&p_dec->fmt_out, p_dec->fmt_in);
|
|
p_dec->fmt_out.i_codec = VLC_CODEC_FLAC;
|
|
p_dec->fmt_out.b_packetized = true;
|
|
|
|
/* */
|
|
p_dec->pf_packetize = Packetize;
|
|
p_dec->pf_flush = Flush;
|
|
p_dec->pf_get_cc = NULL;
|
|
|
|
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;
|
|
|
|
block_BytestreamRelease(&p_sys->bytestream);
|
|
free(p_sys->p_buf);
|
|
free(p_sys);
|
|
}
|
|
|