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/* libFLAC - Free Lossless Audio Codec
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* Copyright (C) 2002,2003,2004,2005,2006,2007 Josh Coalson
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - Neither the name of the Xiph.org Foundation nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include <string.h> /* for memset() */
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#include "FLAC/assert.h"
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#include "private/ogg_encoder_aspect.h"
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#include "private/ogg_mapping.h"
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static const FLAC__byte FLAC__OGG_MAPPING_VERSION_MAJOR = 1;
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static const FLAC__byte FLAC__OGG_MAPPING_VERSION_MINOR = 0;
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/***********************************************************************
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* Public class methods
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***********************************************************************/
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FLAC__bool FLAC__ogg_encoder_aspect_init(FLAC__OggEncoderAspect *aspect)
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/* we will determine the serial number later if necessary */
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if(ogg_stream_init(&aspect->stream_state, aspect->serial_number) != 0)
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aspect->seen_magic = false;
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aspect->is_first_packet = true;
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aspect->samples_written = 0;
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void FLAC__ogg_encoder_aspect_finish(FLAC__OggEncoderAspect *aspect)
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(void)ogg_stream_clear(&aspect->stream_state);
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/*@@@ what about the page? */
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void FLAC__ogg_encoder_aspect_set_serial_number(FLAC__OggEncoderAspect *aspect, long value)
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aspect->serial_number = value;
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FLAC__bool FLAC__ogg_encoder_aspect_set_num_metadata(FLAC__OggEncoderAspect *aspect, unsigned value)
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if(value < (1u << FLAC__OGG_MAPPING_NUM_HEADERS_LEN)) {
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aspect->num_metadata = value;
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void FLAC__ogg_encoder_aspect_set_defaults(FLAC__OggEncoderAspect *aspect)
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aspect->serial_number = 0;
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aspect->num_metadata = 0;
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* The basic FLAC -> Ogg mapping goes like this:
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* - 'fLaC' magic and STREAMINFO block get combined into the first
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* packet. The packet is prefixed with
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* + the one-byte packet type 0x7F
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* + the 2 byte Ogg FLAC mapping version number
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* + tne 2 byte big-endian # of header packets
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* - The first packet is flushed to the first page.
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* - Each subsequent metadata block goes into its own packet.
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* - Each metadata packet is flushed to page (this is not required,
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* the mapping only requires that a flush must occur after all
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* metadata is written).
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* - Each subsequent FLAC audio frame goes into its own packet.
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* This depends on the behavior of FLAC__StreamEncoder that we get a
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* separate write callback for the fLaC magic, and then separate write
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* callbacks for each metadata block and audio frame.
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FLAC__StreamEncoderWriteStatus FLAC__ogg_encoder_aspect_write_callback_wrapper(FLAC__OggEncoderAspect *aspect, const FLAC__byte buffer[], size_t bytes, unsigned samples, unsigned current_frame, FLAC__bool is_last_block, FLAC__OggEncoderAspectWriteCallbackProxy write_callback, void *encoder, void *client_data)
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* This depends on the behavior of FLAC__StreamEncoder that 'samples'
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* will be 0 for metadata writes.
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const FLAC__bool is_metadata = (samples == 0);
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* Treat fLaC magic packet specially. We will note when we see it, then
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* wait until we get the STREAMINFO and prepend it in that packet
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if(aspect->seen_magic) {
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FLAC__byte synthetic_first_packet_body[
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FLAC__OGG_MAPPING_PACKET_TYPE_LENGTH +
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FLAC__OGG_MAPPING_MAGIC_LENGTH +
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FLAC__OGG_MAPPING_VERSION_MAJOR_LENGTH +
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FLAC__OGG_MAPPING_VERSION_MINOR_LENGTH +
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FLAC__OGG_MAPPING_NUM_HEADERS_LENGTH +
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FLAC__STREAM_SYNC_LENGTH +
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FLAC__STREAM_METADATA_HEADER_LENGTH +
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FLAC__STREAM_METADATA_STREAMINFO_LENGTH
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memset(&packet, 0, sizeof(packet));
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packet.granulepos = aspect->samples_written + samples;
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if(aspect->is_first_packet) {
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FLAC__byte *b = synthetic_first_packet_body;
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if(bytes != FLAC__STREAM_METADATA_HEADER_LENGTH + FLAC__STREAM_METADATA_STREAMINFO_LENGTH) {
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* If we get here, our assumption about the way write callbacks happen
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* (explained above) is wrong
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return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;
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/* add first header packet type */
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*b = FLAC__OGG_MAPPING_FIRST_HEADER_PACKET_TYPE;
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b += FLAC__OGG_MAPPING_PACKET_TYPE_LENGTH;
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/* add 'FLAC' mapping magic */
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memcpy(b, FLAC__OGG_MAPPING_MAGIC, FLAC__OGG_MAPPING_MAGIC_LENGTH);
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b += FLAC__OGG_MAPPING_MAGIC_LENGTH;
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/* add Ogg FLAC mapping major version number */
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memcpy(b, &FLAC__OGG_MAPPING_VERSION_MAJOR, FLAC__OGG_MAPPING_VERSION_MAJOR_LENGTH);
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b += FLAC__OGG_MAPPING_VERSION_MAJOR_LENGTH;
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/* add Ogg FLAC mapping minor version number */
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memcpy(b, &FLAC__OGG_MAPPING_VERSION_MINOR, FLAC__OGG_MAPPING_VERSION_MINOR_LENGTH);
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b += FLAC__OGG_MAPPING_VERSION_MINOR_LENGTH;
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/* add number of header packets */
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*b = (FLAC__byte)(aspect->num_metadata >> 8);
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*b = (FLAC__byte)(aspect->num_metadata);
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/* add native FLAC 'fLaC' magic */
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memcpy(b, FLAC__STREAM_SYNC_STRING, FLAC__STREAM_SYNC_LENGTH);
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b += FLAC__STREAM_SYNC_LENGTH;
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memcpy(b, buffer, bytes);
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FLAC__ASSERT(b + bytes - synthetic_first_packet_body == sizeof(synthetic_first_packet_body));
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packet.packet = (unsigned char *)synthetic_first_packet_body;
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packet.bytes = sizeof(synthetic_first_packet_body);
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aspect->is_first_packet = false;
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packet.packet = (unsigned char *)buffer;
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packet.bytes = bytes;
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* FLAC__ASSERT(total_samples_estimate == 0 || total_samples_estimate == aspect->samples_written + samples);
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* but it's really not useful since total_samples_estimate is an estimate and can be inexact
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if(ogg_stream_packetin(&aspect->stream_state, &packet) != 0)
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return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;
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/*@@@ can't figure out a way to pass a useful number for 'samples' to the write_callback, so we'll just pass 0 */
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while(ogg_stream_flush(&aspect->stream_state, &aspect->page) != 0) {
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if(write_callback(encoder, aspect->page.header, aspect->page.header_len, 0, current_frame, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK)
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return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;
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if(write_callback(encoder, aspect->page.body, aspect->page.body_len, 0, current_frame, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK)
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return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;
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while(ogg_stream_pageout(&aspect->stream_state, &aspect->page) != 0) {
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if(write_callback(encoder, aspect->page.header, aspect->page.header_len, 0, current_frame, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK)
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return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;
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if(write_callback(encoder, aspect->page.body, aspect->page.body_len, 0, current_frame, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK)
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return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;
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else if(is_metadata && current_frame == 0 && samples == 0 && bytes == 4 && 0 == memcmp(buffer, FLAC__STREAM_SYNC_STRING, sizeof(FLAC__STREAM_SYNC_STRING))) {
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aspect->seen_magic = true;
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* If we get here, our assumption about the way write callbacks happen
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* explained above is wrong
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return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;
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aspect->samples_written += samples;
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return FLAC__STREAM_ENCODER_WRITE_STATUS_OK;