Mercurial > repos > blastem
annotate vgm.c @ 2304:b3832f73444f
Save audio to a wave file when saving video to APNG
author | Michael Pavone <pavone@retrodev.com> |
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date | Wed, 15 Mar 2023 18:50:24 -0700 |
parents | 327332138c5c |
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rev | line source |
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1 #include <stdlib.h> |
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2 #include <string.h> |
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3 #include <stddef.h> |
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4 #include "vgm.h" |
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5 |
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6 vgm_writer *vgm_write_open(char *filename, uint32_t rate, uint32_t clock, uint32_t cycle) |
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7 { |
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8 FILE *f = fopen(filename, "wb"); |
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9 if (!f) { |
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10 return NULL; |
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11 } |
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12 vgm_writer *writer = calloc(sizeof(vgm_writer), 1); |
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13 memcpy(writer->header.ident, "Vgm ", 4); |
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14 writer->header.version = 0x150; |
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15 writer->header.data_offset = sizeof(writer->header) - offsetof(vgm_header, data_offset); |
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16 writer->header.rate = rate; |
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17 writer->f = f; |
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18 if (1 != fwrite(&writer->header, sizeof(writer->header), 1, f)) { |
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19 free(writer); |
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20 fclose(f); |
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21 return NULL; |
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22 } |
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23 writer->master_clock = clock; |
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24 writer->last_cycle = cycle; |
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25 |
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26 return writer; |
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27 } |
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28 |
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29 void vgm_sn76489_init(vgm_writer *writer, uint32_t clock, uint16_t feedback, uint8_t shift_reg_size, uint8_t flags) |
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30 { |
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31 if (flags && writer->header.version < 0x151) { |
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32 writer->header.version = 0x151; |
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33 } |
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34 writer->header.sn76489_clk = clock, |
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35 writer->header.sn76489_fb = feedback; |
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36 writer->header.sn76489_shift = shift_reg_size; |
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37 writer->header.sn76489_flags = flags; |
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38 } |
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39 |
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40 static void wait_commands(vgm_writer *writer, uint32_t delta) |
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41 { |
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42 if (!delta) { |
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43 return; |
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44 } |
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45 if (delta <= 0x10) { |
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46 fputc(CMD_WAIT_SHORT + (delta - 1), writer->f); |
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47 } else if (delta >= 735 && delta <= (735 + 0x10)) { |
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48 fputc(CMD_WAIT_60, writer->f); |
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49 wait_commands(writer, delta - 735); |
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50 } else if (delta >= 882 && delta <= (882 + 0x10)) { |
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51 fputc(CMD_WAIT_50, writer->f); |
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52 wait_commands(writer, delta - 882); |
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53 } else if (delta > 0xFFFF) { |
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54 uint8_t cmd[3] = {CMD_WAIT, 0xFF, 0xFF}; |
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55 fwrite(cmd, 1, sizeof(cmd), writer->f); |
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56 wait_commands(writer, delta - 0xFFFF); |
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57 } else { |
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58 uint8_t cmd[3] = {CMD_WAIT, delta, delta >> 8}; |
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59 fwrite(cmd, 1, sizeof(cmd), writer->f); |
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60 } |
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61 } |
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62 |
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63 #include "util.h" |
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64 static void add_wait(vgm_writer *writer, uint32_t cycle) |
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65 { |
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66 if (cycle < writer->last_cycle) { |
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67 //This can happen when a YM-2612 write happens immediately after a PSG write |
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68 //due to the relatively low granularity of the PSG's internal clock |
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69 //given that VGM only has a granularity of 44.1 kHz ignoring this is harmless |
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70 return; |
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71 } |
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72 uint64_t last_sample = (uint64_t)writer->last_cycle * (uint64_t)44100; |
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73 last_sample /= (uint64_t)writer->master_clock; |
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74 uint64_t sample = ((uint64_t)cycle + (uint64_t)writer->extra_delta) * (uint64_t)44100; |
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75 sample /= (uint64_t)writer->master_clock; |
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76 uint32_t delta = sample - last_sample; |
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77 |
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78 writer->last_cycle = cycle; |
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79 writer->extra_delta = 0; |
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80 writer->header.num_samples += delta; |
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81 wait_commands(writer, delta); |
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82 } |
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83 |
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84 static uint8_t last_cmd; |
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85 void vgm_sn76489_write(vgm_writer *writer, uint32_t cycle, uint8_t value) |
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86 { |
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87 add_wait(writer, cycle); |
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88 uint8_t cmd[2] = {CMD_PSG, value}; |
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89 last_cmd = CMD_PSG; |
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90 fwrite(cmd, 1, sizeof(cmd), writer->f); |
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91 } |
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92 |
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93 void vgm_ym2612_init(vgm_writer *writer, uint32_t clock) |
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94 { |
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95 writer->header.ym2612_clk = clock; |
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96 } |
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97 |
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98 void vgm_ym2612_part1_write(vgm_writer *writer, uint32_t cycle, uint8_t reg, uint8_t value) |
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99 { |
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100 add_wait(writer, cycle); |
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101 uint8_t cmd[3] = {CMD_YM2612_0, reg, value}; |
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102 last_cmd = CMD_YM2612_0; |
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103 fwrite(cmd, 1, sizeof(cmd), writer->f); |
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104 } |
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105 |
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106 void vgm_ym2612_part2_write(vgm_writer *writer, uint32_t cycle, uint8_t reg, uint8_t value) |
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107 { |
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108 add_wait(writer, cycle); |
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109 uint8_t cmd[3] = {CMD_YM2612_1, reg, value}; |
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fc8fd89aeba9
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110 last_cmd = CMD_YM2612_1; |
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111 fwrite(cmd, 1, sizeof(cmd), writer->f); |
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112 } |
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113 |
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114 void vgm_adjust_cycles(vgm_writer *writer, uint32_t deduction) |
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115 { |
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116 if (deduction > writer->last_cycle) { |
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117 writer->extra_delta += deduction - writer->last_cycle; |
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118 writer->last_cycle = 0; |
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119 } else { |
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120 writer->last_cycle -= deduction; |
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121 } |
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122 } |
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123 |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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124 void vgm_close(vgm_writer *writer) |
508522f08e4d
Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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125 { |
1993
a9449608d0b0
Add stop command to end of recorded VGM stream
Mike Pavone <pavone@retrodev.com>
parents:
1909
diff
changeset
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126 uint8_t cmd = 0x66; |
a9449608d0b0
Add stop command to end of recorded VGM stream
Mike Pavone <pavone@retrodev.com>
parents:
1909
diff
changeset
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127 fwrite(&cmd, 1, sizeof(cmd), writer->f); |
1909
508522f08e4d
Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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128 writer->header.eof_offset = ftell(writer->f) - offsetof(vgm_header, eof_offset); |
508522f08e4d
Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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129 fseek(writer->f, SEEK_SET, 0); |
508522f08e4d
Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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130 fwrite(&writer->header, sizeof(writer->header), 1, writer->f); |
508522f08e4d
Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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131 fclose(writer->f); |
508522f08e4d
Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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132 free(writer); |
508522f08e4d
Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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133 } |