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decoder/modplug: count frame position

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Don't maintain the current time stamp in a floating point variable,
because this is subject to rounding errors.
This commit is contained in:
Max Kellermann
2009-11-14 22:30:57 +01:00
parent f5b9e3c064
commit 1dfadf4815
1 changed files with 11 additions and 13 deletions
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24
src/decoder/modplug_plugin.c
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@@ -94,10 +94,9 @@ mod_decode(struct decoder *decoder, struct input_stream *is)
ModPlug_Settings settings;
GByteArray *bdatas;
struct audio_format audio_format;
float total_time = 0.0;
int ret, current;
int ret;
char audio_buffer[MODPLUG_FRAME_SIZE];
float sec_perbyte;
unsigned frame_size, current_frame = 0;
enum decoder_command cmd = DECODE_COMMAND_NONE;
bdatas = mod_loadfile(decoder, is);
@@ -126,29 +125,28 @@ mod_decode(struct decoder *decoder, struct input_stream *is)
audio_format_init(&audio_format, 44100, 16, 2);
assert(audio_format_valid(&audio_format));
sec_perbyte =
1.0 / ((audio_format.bits * audio_format.channels / 8.0) *
(float)audio_format.sample_rate);
decoder_initialized(decoder, &audio_format,
is->seekable, ModPlug_GetLength(f) / 1000.0);
total_time = 0;
frame_size = audio_format_frame_size(&audio_format);
do {
ret = ModPlug_Read(f, audio_buffer, MODPLUG_FRAME_SIZE);
if (ret <= 0)
break;
total_time += ret * sec_perbyte;
current_frame += (unsigned)ret / frame_size;
cmd = decoder_data(decoder, NULL,
audio_buffer, ret,
total_time, 0, NULL);
(float)current_frame / (float)audio_format.sample_rate,
0, NULL);
if (cmd == DECODE_COMMAND_SEEK) {
total_time = decoder_seek_where(decoder);
current = total_time * 1000;
ModPlug_Seek(f, current);
float where = decoder_seek_where(decoder);
ModPlug_Seek(f, (int)(where * 1000.0));
current_frame = (unsigned)(where * audio_format.sample_rate);
decoder_command_finished(decoder);
}