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72 lines
2.8 KiB
C
72 lines
2.8 KiB
C
#include "vorbis_custom_decoder.h"
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#ifdef VGM_USE_VORBIS
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#include <vorbis/codec.h>
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/* **************************************************************************** */
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/* EXTERNAL API */
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/* **************************************************************************** */
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/**
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* OGL removes the Ogg layer and uses 16b packet headers, that have the size of the next packet, but
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* the lower 2b need to be removed (usually 00 but 01 for the id packet, not sure about the meaning).
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*/
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int vorbis_custom_setup_init_ogl(STREAMFILE *streamFile, off_t start_offset, vorbis_custom_codec_data *data) {
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off_t offset = start_offset;
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size_t packet_size;
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/* read 3 packets with triad (id/comment/setup), each with an OGL header */
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/* normal identificacion packet */
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packet_size = (uint16_t)read_16bitLE(offset, streamFile) >> 2;
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if (packet_size > data->buffer_size) goto fail;
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data->op.bytes = read_streamfile(data->buffer,offset+2,packet_size, streamFile);
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if (vorbis_synthesis_headerin(&data->vi, &data->vc, &data->op) != 0) goto fail; /* parse identification header */
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offset += 2+packet_size;
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/* normal comment packet */
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packet_size = (uint16_t)read_16bitLE(offset, streamFile) >> 2;
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if (packet_size > data->buffer_size) goto fail;
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data->op.bytes = read_streamfile(data->buffer,offset+2,packet_size, streamFile);
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if (vorbis_synthesis_headerin(&data->vi, &data->vc, &data->op) !=0 ) goto fail; /* parse comment header */
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offset += 2+packet_size;
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/* normal setup packet */
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packet_size = (uint16_t)read_16bitLE(offset, streamFile) >> 2;
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if (packet_size > data->buffer_size) goto fail;
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data->op.bytes = read_streamfile(data->buffer,offset+2,packet_size, streamFile);
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if (vorbis_synthesis_headerin(&data->vi, &data->vc, &data->op) != 0) goto fail; /* parse setup header */
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offset += 2+packet_size;
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/* data starts after triad */
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data->config.data_start_offset = offset;
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return 1;
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fail:
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return 0;
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}
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int vorbis_custom_parse_packet_ogl(VGMSTREAMCHANNEL *stream, vorbis_custom_codec_data *data) {
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size_t bytes;
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/* get next packet size from the OGL 16b header (upper 14b) */
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data->op.bytes = (uint16_t)read_16bitLE(stream->offset, stream->streamfile) >> 2;
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stream->offset += 2;
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if (data->op.bytes == 0 || data->op.bytes == 0xFFFF || data->op.bytes > data->buffer_size) goto fail; /* EOF or end padding */
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/* read raw block */
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bytes = read_streamfile(data->buffer,stream->offset, data->op.bytes,stream->streamfile);
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stream->offset += data->op.bytes;
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if (bytes != data->op.bytes) goto fail; /* wrong packet? */
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return 1;
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fail:
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return 0;
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}
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#endif
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