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refactor midi read buffer to stream

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This commit is contained in:
hathach 2021-04-02 14:52:44 +07:00
parent da59c4ad44
commit 350eb11277
1 changed files with 18 additions and 21 deletions
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39
src/class/midi/midi_device.c
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@ -68,10 +68,7 @@ typedef struct
// Messages are always 4 bytes long, queue them for reading and writing so the
// callers can use the Stream interface with single-byte read/write calls.
midid_stream_t stream_write;
uint8_t read_buffer[4];
uint8_t read_buffer_length;
uint8_t read_target_length;
midid_stream_t stream_read;
// Endpoint Transfer buffer
CFG_TUSB_MEM_ALIGN uint8_t epout_buf[CFG_TUD_MIDI_EP_BUFSIZE];
@ -131,14 +128,16 @@ uint32_t tud_midi_n_stream_read(uint8_t itf, uint8_t cable_num, void* buffer, ui
{
(void) cable_num;
midid_interface_t* midi = &_midid_itf[itf];
midid_stream_t* stream = &midi->stream_read;
// Fill empty buffer
if ( midi->read_buffer_length == 0 )
TU_VERIFY(bufsize, 0);
// Get new packet from fifo
if ( stream->total == 0 )
{
TU_VERIFY(tud_midi_n_packet_read(itf, midi->read_buffer), 0);
TU_VERIFY(tud_midi_n_packet_read(itf, stream->buffer), 0);
uint8_t const code_index = midi->read_buffer[0] & 0x0f;
uint8_t count;
uint8_t const code_index = stream->buffer[0] & 0x0f;
// MIDI 1.0 Table 4-1: Code Index Number Classifications
switch(code_index)
@ -151,34 +150,32 @@ uint32_t tud_midi_n_stream_read(uint8_t itf, uint8_t cable_num, void* buffer, ui
case MIDI_CIN_SYSEX_END_1BYTE:
case MIDI_CIN_1BYTE_DATA:
count = 1;
stream->total = 1;
break;
case MIDI_CIN_SYSCOM_2BYTE :
case MIDI_CIN_SYSEX_END_2BYTE :
case MIDI_CIN_PROGRAM_CHANGE :
case MIDI_CIN_CHANNEL_PRESSURE :
count = 2;
stream->total = 2;
break;
default:
count = 3;
stream->total = 3;
break;
}
midi->read_buffer_length = count;
}
uint32_t n = tu_min32(midi->read_buffer_length - midi->read_target_length, bufsize);
uint32_t const n = tu_min32(stream->total - stream->index, bufsize);
// Skip the header in the buffer
memcpy(buffer, midi->read_buffer + 1 + midi->read_target_length, n);
midi->read_target_length += n;
// Skip the header (1st byte) in the buffer
memcpy(buffer, stream->buffer + 1 + stream->index, n);
stream->index += n;
if ( midi->read_target_length == midi->read_buffer_length )
if ( stream->total == stream->index )
{
midi->read_buffer_length = 0;
midi->read_target_length = 0;
stream->index = 0;
stream->total = 0;
}
return n;