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/* libOggFLAC - Free Lossless Audio Codec + Ogg library

 * Copyright (C) 2002,2003,2004,2005  Josh Coalson

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 * notice, this list of conditions and the following disclaimer.

 *

 * - Redistributions in binary form must reproduce the above copyright

 * notice, this list of conditions and the following disclaimer in the

 * documentation and/or other materials provided with the distribution.

 *

 * - Neither the name of the Xiph.org Foundation nor the names of its

 * contributors may be used to endorse or promote products derived from

 * this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

 

#include <string.h> /* for memset() */

#include "FLAC/assert.h"

#include "private/ogg_encoder_aspect.h"

#include "private/ogg_mapping.h"

 

static const FLAC__byte OggFLAC__MAPPING_VERSION_MAJOR = 1;

static const FLAC__byte OggFLAC__MAPPING_VERSION_MINOR = 0;

 

/***********************************************************************

 *

 * Public class methods

 *

 ***********************************************************************/

 

FLAC__bool OggFLAC__ogg_encoder_aspect_init(OggFLAC__OggEncoderAspect *aspect)

{

        /* we will determine the serial number later if necessary */

        if(ogg_stream_init(&aspect->stream_state, aspect->serial_number) != 0)

                return false;

 

        aspect->seen_magic = false;

        aspect->is_first_packet = true;

        aspect->samples_written = 0;

 

        return true;

}

 

void OggFLAC__ogg_encoder_aspect_finish(OggFLAC__OggEncoderAspect *aspect)

{

        (void)ogg_stream_clear(&aspect->stream_state);

        /*@@@ what aobut the page? */

}

 

void OggFLAC__ogg_encoder_aspect_set_serial_number(OggFLAC__OggEncoderAspect *aspect, long value)

{

        aspect->serial_number = value;

}

 

FLAC__bool OggFLAC__ogg_encoder_aspect_set_num_metadata(OggFLAC__OggEncoderAspect *aspect, unsigned value)

{

        if(value < (1u << OggFLAC__MAPPING_NUM_HEADERS_LEN)) {

                aspect->num_metadata = value;

                return true;

        }

        else

                return false;

}

 

void OggFLAC__ogg_encoder_aspect_set_defaults(OggFLAC__OggEncoderAspect *aspect)

{

        aspect->serial_number = 0;

        aspect->num_metadata = 0;

}

 

/*

 * The basic FLAC -> Ogg mapping goes like this:

 *

 * - 'fLaC' magic and STREAMINFO block get combined into the first

 *   packet.  The packet is prefixed with

 *   + the one-byte packet type 0x7F

 *   + 'FLAC' magic

 *   + the 2 byte Ogg FLAC mapping version number

 *   + tne 2 byte big-endian # of header packets

 * - The first packet is flushed to the first page.

 * - Each subsequent metadata block goes into its own packet.

 * - Each metadata packet is flushed to page (this is not required,

 *   the mapping only requires that a flush must occur after all

 *   metadata is written).

 * - Each subsequent FLAC audio frame goes into its own packet.

 *

 * WATCHOUT:

 * This depends on the behavior of FLAC__StreamEncoder that we get a

 * separate write callback for the fLaC magic, and then separate write

 * callbacks for each metadata block and audio frame.

 */

FLAC__StreamEncoderWriteStatus OggFLAC__ogg_encoder_aspect_write_callback_wrapper(OggFLAC__OggEncoderAspect *aspect, const FLAC__uint64 total_samples_estimate, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, OggFLAC__OggEncoderAspectWriteCallbackProxy write_callback, void *encoder, void *client_data)

{

        /* WATCHOUT:

         * This depends on the behavior of FLAC__StreamEncoder that 'samples'

         * will be 0 for metadata writes.

         */

        const FLAC__bool is_metadata = (samples == 0);

 

        /*

         * Treat fLaC magic packet specially.  We will note when we see it, then

         * wait until we get the STREAMINFO and prepend it in that packet

         */

        if(aspect->seen_magic) {

                ogg_packet packet;

                FLAC__byte synthetic_first_packet_body[

                        OggFLAC__MAPPING_PACKET_TYPE_LENGTH +

                        OggFLAC__MAPPING_MAGIC_LENGTH +

                        OggFLAC__MAPPING_VERSION_MAJOR_LENGTH +

                        OggFLAC__MAPPING_VERSION_MINOR_LENGTH +

                        OggFLAC__MAPPING_NUM_HEADERS_LENGTH +

                        FLAC__STREAM_SYNC_LENGTH +

                        FLAC__STREAM_METADATA_HEADER_LENGTH +

                        FLAC__STREAM_METADATA_STREAMINFO_LENGTH

                ];

 

                memset(&packet, 0, sizeof(packet));

                packet.granulepos = aspect->samples_written + samples;

 

                if(aspect->is_first_packet) {

                        FLAC__byte *b = synthetic_first_packet_body;

                        if(bytes != FLAC__STREAM_METADATA_HEADER_LENGTH + FLAC__STREAM_METADATA_STREAMINFO_LENGTH) {

                                /*

                                 * If we get here, our assumption about the way write callbacks happen

                                 * explained above is wrong

                                 */

                                FLAC__ASSERT(0);

                                return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;

                        }

                        /* add first header packet type */

                        *b = OggFLAC__MAPPING_FIRST_HEADER_PACKET_TYPE;

                        b += OggFLAC__MAPPING_PACKET_TYPE_LENGTH;

                        /* add 'FLAC' mapping magic */

                        memcpy(b, OggFLAC__MAPPING_MAGIC, OggFLAC__MAPPING_MAGIC_LENGTH);

                        b += OggFLAC__MAPPING_MAGIC_LENGTH;

                        /* add Ogg FLAC mapping major version number */

                        memcpy(b, &OggFLAC__MAPPING_VERSION_MAJOR, OggFLAC__MAPPING_VERSION_MAJOR_LENGTH);

                        b += OggFLAC__MAPPING_VERSION_MAJOR_LENGTH;

                        /* add Ogg FLAC mapping minor version number */

                        memcpy(b, &OggFLAC__MAPPING_VERSION_MINOR, OggFLAC__MAPPING_VERSION_MINOR_LENGTH);

                        b += OggFLAC__MAPPING_VERSION_MINOR_LENGTH;

                        /* add number of header packets */

                        *b = (FLAC__byte)(aspect->num_metadata >> 8);

                        b++;

                        *b = (FLAC__byte)(aspect->num_metadata);

                        b++;

                        /* add native FLAC 'fLaC' magic */

                        memcpy(b, FLAC__STREAM_SYNC_STRING, FLAC__STREAM_SYNC_LENGTH);

                        b += FLAC__STREAM_SYNC_LENGTH;

                        /* add STREAMINFO */

                        memcpy(b, buffer, bytes);

                        FLAC__ASSERT(b + bytes - synthetic_first_packet_body == sizeof(synthetic_first_packet_body));

                        packet.packet = (unsigned char *)synthetic_first_packet_body;

                        packet.bytes = sizeof(synthetic_first_packet_body);

 

                        packet.b_o_s = 1;

                        aspect->is_first_packet = false;

                }

                else {

                        packet.packet = (unsigned char *)buffer;

                        packet.bytes = bytes;

                }

 

                if(total_samples_estimate > 0 && total_samples_estimate == aspect->samples_written + samples)

                        packet.e_o_s = 1;

 

                if(ogg_stream_packetin(&aspect->stream_state, &packet) != 0)

                        return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;

 

                /*@@@ can't figure out a way to pass a useful number for 'samples' to the write_callback, so we'll just pass 0 */

                if(is_metadata) {

                        while(ogg_stream_flush(&aspect->stream_state, &aspect->page) != 0) {

                                if(write_callback(encoder, aspect->page.header, aspect->page.header_len, 0, current_frame, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK)

                                        return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;

                                if(write_callback(encoder, aspect->page.body, aspect->page.body_len, 0, current_frame, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK)

                                        return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;

                        }

                }

                else {

                        while(ogg_stream_pageout(&aspect->stream_state, &aspect->page) != 0) {

                                if(write_callback(encoder, aspect->page.header, aspect->page.header_len, 0, current_frame, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK)

                                        return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;

                                if(write_callback(encoder, aspect->page.body, aspect->page.body_len, 0, current_frame, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK)

                                        return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;

                        }

                }

        }

        else if(is_metadata && current_frame == 0 && samples == 0 && bytes == 4 && 0 == memcmp(buffer, FLAC__STREAM_SYNC_STRING, sizeof(FLAC__STREAM_SYNC_STRING))) {

                aspect->seen_magic = true;

        }

        else {

                /*

                 * If we get here, our assumption about the way write callbacks happen

                 * explained above is wrong

                 */

                FLAC__ASSERT(0);

                return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;

        }

 

        aspect->samples_written += samples;

 

        return FLAC__STREAM_ENCODER_WRITE_STATUS_OK;

}