encoder/wave: convert to C++
This commit is contained in:
Max Kellermann
281
src/encoder/WaveEncoderPlugin.cxx
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281
src/encoder/WaveEncoderPlugin.cxx
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/*
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* Copyright (C) 2003-2013 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "WaveEncoderPlugin.hxx"
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#include "encoder_api.h"
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#include "encoder_plugin.h"
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#include "util/fifo_buffer.h"
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extern "C" {
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#include "util/growing_fifo.h"
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}
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#include <glib.h>
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#include <assert.h>
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#include <string.h>
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struct WaveEncoder {
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struct encoder encoder;
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unsigned bits;
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struct fifo_buffer *buffer;
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WaveEncoder() {
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encoder_struct_init(&encoder, &wave_encoder_plugin);
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}
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};
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struct wave_header {
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uint32_t id_riff;
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uint32_t riff_size;
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uint32_t id_wave;
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uint32_t id_fmt;
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uint32_t fmt_size;
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uint16_t format;
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uint16_t channels;
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uint32_t freq;
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uint32_t byterate;
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uint16_t blocksize;
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uint16_t bits;
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uint32_t id_data;
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uint32_t data_size;
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};
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extern const struct encoder_plugin wave_encoder_plugin;
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static void
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fill_wave_header(struct wave_header *header, int channels, int bits,
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int freq, int block_size)
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{
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int data_size = 0x0FFFFFFF;
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/* constants */
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header->id_riff = GUINT32_TO_LE(0x46464952);
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header->id_wave = GUINT32_TO_LE(0x45564157);
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header->id_fmt = GUINT32_TO_LE(0x20746d66);
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header->id_data = GUINT32_TO_LE(0x61746164);
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/* wave format */
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header->format = GUINT16_TO_LE(1); // PCM_FORMAT
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header->channels = GUINT16_TO_LE(channels);
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header->bits = GUINT16_TO_LE(bits);
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header->freq = GUINT32_TO_LE(freq);
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header->blocksize = GUINT16_TO_LE(block_size);
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header->byterate = GUINT32_TO_LE(freq * block_size);
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/* chunk sizes (fake data length) */
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header->fmt_size = GUINT32_TO_LE(16);
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header->data_size = GUINT32_TO_LE(data_size);
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header->riff_size = GUINT32_TO_LE(4 + (8 + 16) +
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(8 + data_size));
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}
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static struct encoder *
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wave_encoder_init(gcc_unused const struct config_param *param,
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gcc_unused GError **error)
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{
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WaveEncoder *encoder = new WaveEncoder();
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return &encoder->encoder;
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}
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static void
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wave_encoder_finish(struct encoder *_encoder)
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{
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WaveEncoder *encoder = (WaveEncoder *)_encoder;
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g_free(encoder);
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}
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static bool
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wave_encoder_open(struct encoder *_encoder,
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gcc_unused struct audio_format *audio_format,
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gcc_unused GError **error)
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{
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WaveEncoder *encoder = (WaveEncoder *)_encoder;
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assert(audio_format_valid(audio_format));
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switch (audio_format->format) {
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case SAMPLE_FORMAT_S8:
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encoder->bits = 8;
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break;
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case SAMPLE_FORMAT_S16:
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encoder->bits = 16;
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break;
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case SAMPLE_FORMAT_S24_P32:
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encoder->bits = 24;
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break;
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case SAMPLE_FORMAT_S32:
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encoder->bits = 32;
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break;
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default:
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audio_format->format = SAMPLE_FORMAT_S16;
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encoder->bits = 16;
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break;
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}
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encoder->buffer = growing_fifo_new();
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wave_header *header = (wave_header *)
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growing_fifo_write(&encoder->buffer, sizeof(*header));
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/* create PCM wave header in initial buffer */
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fill_wave_header(header,
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audio_format->channels,
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encoder->bits,
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audio_format->sample_rate,
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(encoder->bits / 8) * audio_format->channels );
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fifo_buffer_append(encoder->buffer, sizeof(*header));
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return true;
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}
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static void
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wave_encoder_close(struct encoder *_encoder)
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{
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WaveEncoder *encoder = (WaveEncoder *)_encoder;
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fifo_buffer_free(encoder->buffer);
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}
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static inline size_t
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pcm16_to_wave(uint16_t *dst16, const uint16_t *src16, size_t length)
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{
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size_t cnt = length >> 1;
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while (cnt > 0) {
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*dst16++ = GUINT16_TO_LE(*src16++);
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cnt--;
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}
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return length;
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}
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static inline size_t
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pcm32_to_wave(uint32_t *dst32, const uint32_t *src32, size_t length)
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{
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size_t cnt = length >> 2;
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while (cnt > 0){
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*dst32++ = GUINT32_TO_LE(*src32++);
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cnt--;
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}
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return length;
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}
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static inline size_t
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pcm24_to_wave(uint8_t *dst8, const uint32_t *src32, size_t length)
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{
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uint32_t value;
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uint8_t *dst_old = dst8;
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length = length >> 2;
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while (length > 0){
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value = *src32++;
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*dst8++ = (value) & 0xFF;
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*dst8++ = (value >> 8) & 0xFF;
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*dst8++ = (value >> 16) & 0xFF;
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length--;
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}
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//correct buffer length
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return (dst8 - dst_old);
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}
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static bool
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wave_encoder_write(struct encoder *_encoder,
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const void *src, size_t length,
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gcc_unused GError **error)
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{
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WaveEncoder *encoder = (WaveEncoder *)_encoder;
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uint8_t *dst = (uint8_t *)growing_fifo_write(&encoder->buffer, length);
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#if (G_BYTE_ORDER == G_LITTLE_ENDIAN)
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switch (encoder->bits) {
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case 8:
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case 16:
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case 32:// optimized cases
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memcpy(dst, src, length);
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break;
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case 24:
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length = pcm24_to_wave(dst, (const uint32_t *)src, length);
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break;
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}
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#elif (G_BYTE_ORDER == G_BIG_ENDIAN)
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switch (encoder->bits) {
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case 8:
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memcpy(dst, src, length);
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break;
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case 16:
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length = pcm16_to_wave(dst, (const uint16_t *)src, length);
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break;
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case 24:
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length = pcm24_to_wave(dst, (const uint32_t *)src, length);
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break;
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case 32:
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length = pcm32_to_wave(dst, (const uint32_t *)src, length);
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break;
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}
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#else
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#error G_BYTE_ORDER set to G_PDP_ENDIAN is not supported by wave_encoder
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#endif
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fifo_buffer_append(encoder->buffer, length);
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return true;
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}
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static size_t
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wave_encoder_read(struct encoder *_encoder, void *dest, size_t length)
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{
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WaveEncoder *encoder = (WaveEncoder *)_encoder;
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size_t max_length;
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const void *src = fifo_buffer_read(encoder->buffer, &max_length);
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if (src == NULL)
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return 0;
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if (length > max_length)
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length = max_length;
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memcpy(dest, src, length);
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fifo_buffer_consume(encoder->buffer, length);
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return length;
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}
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static const char *
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wave_encoder_get_mime_type(gcc_unused struct encoder *_encoder)
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{
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return "audio/wav";
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}
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const struct encoder_plugin wave_encoder_plugin = {
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"wave",
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wave_encoder_init,
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wave_encoder_finish,
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wave_encoder_open,
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wave_encoder_close,
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nullptr,
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nullptr,
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nullptr,
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nullptr,
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wave_encoder_write,
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wave_encoder_read,
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wave_encoder_get_mime_type,
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};
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