79 lines
3.2 KiB
C
79 lines
3.2 KiB
C
#ifndef _MPEG_DECODER_H_
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#define _MPEG_DECODER_H_
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#include "../vgmstream.h"
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#include "../coding/coding.h"
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/* used by mpeg_decoder.c, but scattered in other .c files */
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#ifdef VGM_USE_MPEG
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#include <mpg123/mpg123.h>
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/* represents a single MPEG stream */
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typedef struct {
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/* per stream as sometimes mpg123 must be fed in passes if data is big enough (ex. EALayer3 multichannel) */
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uint8_t *buffer; /* raw data buffer */
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size_t buffer_size;
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size_t bytes_in_buffer;
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int buffer_full; /* raw buffer has been filled */
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int buffer_used; /* raw buffer has been fed to the decoder */
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mpg123_handle *m; /* MPEG decoder */
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uint8_t *output_buffer; /* decoded samples from this stream (in bytes for mpg123) */
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size_t output_buffer_size;
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size_t samples_filled; /* data in the buffer (in samples) */
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size_t samples_used; /* data extracted from the buffer */
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size_t current_size_count; /* data read (if the parser needs to know) */
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size_t current_size_target; /* max data, until something happens */
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size_t decode_to_discard; /* discard from this stream only (for EALayer3 or AWC) */
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int channels_per_frame; /* for rare cases that streams don't share this */
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} mpeg_custom_stream;
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struct mpeg_codec_data {
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/* regular/single MPEG internals */
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uint8_t *buffer; /* raw data buffer */
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size_t buffer_size;
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size_t bytes_in_buffer;
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int buffer_full; /* raw buffer has been filled */
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int buffer_used; /* raw buffer has been fed to the decoder */
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mpg123_handle *m; /* MPEG decoder */
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struct mpg123_frameinfo mi; /* start info, so it's available even when resetting */
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/* for internal use */
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int channels_per_frame;
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int samples_per_frame;
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/* for some calcs */
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int bitrate_per_frame;
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int sample_rate_per_frame;
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/* custom MPEG internals */
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int custom; /* flag */
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mpeg_custom_t type; /* mpeg subtype */
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mpeg_custom_config config; /* config depending on the mode */
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size_t default_buffer_size;
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mpeg_custom_stream **streams; /* array of MPEG streams (ex. 2ch+2ch) */
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size_t streams_size;
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size_t skip_samples; /* base encoder delay */
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size_t samples_to_discard; /* for custom mpeg looping */
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};
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int mpeg_custom_setup_init_default(STREAMFILE* sf, off_t start_offset, mpeg_codec_data* data, coding_t* coding_type);
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int mpeg_custom_setup_init_ealayer3(STREAMFILE* sf, off_t start_offset, mpeg_codec_data* data, coding_t* coding_type);
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int mpeg_custom_setup_init_awc(STREAMFILE* sf, off_t start_offset, mpeg_codec_data* data, coding_t* coding_type);
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int mpeg_custom_setup_init_eamp3(STREAMFILE* sf, off_t start_offset, mpeg_codec_data* data, coding_t* coding_type);
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int mpeg_custom_parse_frame_default(VGMSTREAMCHANNEL* stream, mpeg_codec_data* data, int num_stream);
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int mpeg_custom_parse_frame_ahx(VGMSTREAMCHANNEL* stream, mpeg_codec_data* data, int num_stream);
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int mpeg_custom_parse_frame_ealayer3(VGMSTREAMCHANNEL* stream, mpeg_codec_data* data, int num_stream);
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int mpeg_custom_parse_frame_awc(VGMSTREAMCHANNEL* stream, mpeg_codec_data* data, int num_stream);
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int mpeg_custom_parse_frame_eamp3(VGMSTREAMCHANNEL* stream, mpeg_codec_data* data, int num_stream);
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#endif/* VGM_USE_MPEG */
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#endif/*_MPEG_DECODER_H_ */
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