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decoder/flac: use pcm_buffer instead of fixed buffer

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This is a great simplification for flac_common_write(), because we can
convert and submit all of the buffer in one turn.  No more partial
buffers with complicated formulas.
This commit is contained in:
Max Kellermann 2009-11-10 21:46:10 +01:00
parent b6a2ffd3d7
commit 2f69831fb8
2 changed files with 27 additions and 35 deletions
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56
src/decoder/_flac_common.c
View File

@ -31,6 +31,8 @@ void
flac_data_init(struct flac_data *data, struct decoder * decoder,
struct input_stream *input_stream)
{
pcm_buffer_init(&data->buffer);
data->time = 0;
data->position = 0;
data->bit_rate = 0;
@ -43,6 +45,8 @@ flac_data_init(struct flac_data *data, struct decoder * decoder,
void
flac_data_deinit(struct flac_data *data)
{
pcm_buffer_deinit(&data->buffer);
if (data->replay_gain_info != NULL)
replay_gain_info_free(data->replay_gain_info);
@ -333,45 +337,31 @@ FLAC__StreamDecoderWriteStatus
flac_common_write(struct flac_data *data, const FLAC__Frame * frame,
const FLAC__int32 *const buf[])
{
unsigned int c_samp;
const unsigned sample_format = data->audio_format.bits;
const unsigned int num_channels = frame->header.channels;
const unsigned int bytes_per_sample =
audio_format_sample_size(&data->audio_format);
const unsigned int bytes_per_channel =
bytes_per_sample * frame->header.channels;
const unsigned int max_samples = FLAC_CHUNK_SIZE / bytes_per_channel;
unsigned int num_samples;
enum decoder_command cmd;
size_t buffer_size = frame->header.blocksize *
audio_format_frame_size(&data->audio_format);
void *buffer;
for (c_samp = 0; c_samp < frame->header.blocksize;
c_samp += num_samples) {
num_samples = frame->header.blocksize - c_samp;
if (num_samples > max_samples)
num_samples = max_samples;
buffer = pcm_buffer_get(&data->buffer, buffer_size);
flac_convert(data->chunk,
num_channels, sample_format, buf,
c_samp, c_samp + num_samples);
flac_convert(buffer, data->audio_format.channels,
data->audio_format.bits, buf,
0, frame->header.blocksize);
cmd = decoder_data(data->decoder, data->input_stream,
data->chunk,
num_samples * bytes_per_channel,
data->time, data->bit_rate,
data->replay_gain_info);
switch (cmd) {
case DECODE_COMMAND_NONE:
case DECODE_COMMAND_START:
break;
cmd = decoder_data(data->decoder, data->input_stream,
buffer, buffer_size,
data->time, data->bit_rate,
data->replay_gain_info);
switch (cmd) {
case DECODE_COMMAND_NONE:
case DECODE_COMMAND_START:
break;
case DECODE_COMMAND_STOP:
return
FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
case DECODE_COMMAND_STOP:
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
case DECODE_COMMAND_SEEK:
return
FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
case DECODE_COMMAND_SEEK:
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;

6
src/decoder/_flac_common.h
View File

@ -24,7 +24,8 @@
#ifndef MPD_FLAC_COMMON_H
#define MPD_FLAC_COMMON_H
#include "../decoder_api.h"
#include "decoder_api.h"
#include "pcm_buffer.h"
#include "config.h"
#include <glib.h>
@ -145,7 +146,8 @@ typedef size_t flac_read_status_size_t;
#define FLAC_CHUNK_SIZE 4080
struct flac_data {
unsigned char chunk[FLAC_CHUNK_SIZE];
struct pcm_buffer buffer;
float time;
unsigned int bit_rate;
struct audio_format audio_format;