From da1f4b3ede750c83039bcd21647569bde00a2992 Mon Sep 17 00:00:00 2001 From: Max Kellermann Date: Tue, 30 Jul 2013 08:48:53 +0200 Subject: encoder/wave: convert to C++ --- src/encoder/WaveEncoderPlugin.cxx | 281 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 281 insertions(+) create mode 100644 src/encoder/WaveEncoderPlugin.cxx (limited to 'src/encoder/WaveEncoderPlugin.cxx') diff --git a/src/encoder/WaveEncoderPlugin.cxx b/src/encoder/WaveEncoderPlugin.cxx new file mode 100644 index 000000000..fb52d7906 --- /dev/null +++ b/src/encoder/WaveEncoderPlugin.cxx @@ -0,0 +1,281 @@ +/* + * Copyright (C) 2003-2013 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" +#include "WaveEncoderPlugin.hxx" +#include "encoder_api.h" +#include "encoder_plugin.h" +#include "util/fifo_buffer.h" +extern "C" { +#include "util/growing_fifo.h" +} + +#include + +#include +#include + +struct WaveEncoder { + struct encoder encoder; + unsigned bits; + + struct fifo_buffer *buffer; + + WaveEncoder() { + encoder_struct_init(&encoder, &wave_encoder_plugin); + } +}; + +struct wave_header { + uint32_t id_riff; + uint32_t riff_size; + uint32_t id_wave; + uint32_t id_fmt; + uint32_t fmt_size; + uint16_t format; + uint16_t channels; + uint32_t freq; + uint32_t byterate; + uint16_t blocksize; + uint16_t bits; + uint32_t id_data; + uint32_t data_size; +}; + +extern const struct encoder_plugin wave_encoder_plugin; + +static void +fill_wave_header(struct wave_header *header, int channels, int bits, + int freq, int block_size) +{ + int data_size = 0x0FFFFFFF; + + /* constants */ + header->id_riff = GUINT32_TO_LE(0x46464952); + header->id_wave = GUINT32_TO_LE(0x45564157); + header->id_fmt = GUINT32_TO_LE(0x20746d66); + header->id_data = GUINT32_TO_LE(0x61746164); + + /* wave format */ + header->format = GUINT16_TO_LE(1); // PCM_FORMAT + header->channels = GUINT16_TO_LE(channels); + header->bits = GUINT16_TO_LE(bits); + header->freq = GUINT32_TO_LE(freq); + header->blocksize = GUINT16_TO_LE(block_size); + header->byterate = GUINT32_TO_LE(freq * block_size); + + /* chunk sizes (fake data length) */ + header->fmt_size = GUINT32_TO_LE(16); + header->data_size = GUINT32_TO_LE(data_size); + header->riff_size = GUINT32_TO_LE(4 + (8 + 16) + + (8 + data_size)); +} + +static struct encoder * +wave_encoder_init(gcc_unused const struct config_param *param, + gcc_unused GError **error) +{ + WaveEncoder *encoder = new WaveEncoder(); + return &encoder->encoder; +} + +static void +wave_encoder_finish(struct encoder *_encoder) +{ + WaveEncoder *encoder = (WaveEncoder *)_encoder; + + g_free(encoder); +} + +static bool +wave_encoder_open(struct encoder *_encoder, + gcc_unused struct audio_format *audio_format, + gcc_unused GError **error) +{ + WaveEncoder *encoder = (WaveEncoder *)_encoder; + + assert(audio_format_valid(audio_format)); + + switch (audio_format->format) { + case SAMPLE_FORMAT_S8: + encoder->bits = 8; + break; + + case SAMPLE_FORMAT_S16: + encoder->bits = 16; + break; + + case SAMPLE_FORMAT_S24_P32: + encoder->bits = 24; + break; + + case SAMPLE_FORMAT_S32: + encoder->bits = 32; + break; + + default: + audio_format->format = SAMPLE_FORMAT_S16; + encoder->bits = 16; + break; + } + + encoder->buffer = growing_fifo_new(); + wave_header *header = (wave_header *) + growing_fifo_write(&encoder->buffer, sizeof(*header)); + + /* create PCM wave header in initial buffer */ + fill_wave_header(header, + audio_format->channels, + encoder->bits, + audio_format->sample_rate, + (encoder->bits / 8) * audio_format->channels ); + fifo_buffer_append(encoder->buffer, sizeof(*header)); + + return true; +} + +static void +wave_encoder_close(struct encoder *_encoder) +{ + WaveEncoder *encoder = (WaveEncoder *)_encoder; + + fifo_buffer_free(encoder->buffer); +} + +static inline size_t +pcm16_to_wave(uint16_t *dst16, const uint16_t *src16, size_t length) +{ + size_t cnt = length >> 1; + while (cnt > 0) { + *dst16++ = GUINT16_TO_LE(*src16++); + cnt--; + } + return length; +} + +static inline size_t +pcm32_to_wave(uint32_t *dst32, const uint32_t *src32, size_t length) +{ + size_t cnt = length >> 2; + while (cnt > 0){ + *dst32++ = GUINT32_TO_LE(*src32++); + cnt--; + } + return length; +} + +static inline size_t +pcm24_to_wave(uint8_t *dst8, const uint32_t *src32, size_t length) +{ + uint32_t value; + uint8_t *dst_old = dst8; + + length = length >> 2; + while (length > 0){ + value = *src32++; + *dst8++ = (value) & 0xFF; + *dst8++ = (value >> 8) & 0xFF; + *dst8++ = (value >> 16) & 0xFF; + length--; + } + //correct buffer length + return (dst8 - dst_old); +} + +static bool +wave_encoder_write(struct encoder *_encoder, + const void *src, size_t length, + gcc_unused GError **error) +{ + WaveEncoder *encoder = (WaveEncoder *)_encoder; + + uint8_t *dst = (uint8_t *)growing_fifo_write(&encoder->buffer, length); + +#if (G_BYTE_ORDER == G_LITTLE_ENDIAN) + switch (encoder->bits) { + case 8: + case 16: + case 32:// optimized cases + memcpy(dst, src, length); + break; + case 24: + length = pcm24_to_wave(dst, (const uint32_t *)src, length); + break; + } +#elif (G_BYTE_ORDER == G_BIG_ENDIAN) + switch (encoder->bits) { + case 8: + memcpy(dst, src, length); + break; + case 16: + length = pcm16_to_wave(dst, (const uint16_t *)src, length); + break; + case 24: + length = pcm24_to_wave(dst, (const uint32_t *)src, length); + break; + case 32: + length = pcm32_to_wave(dst, (const uint32_t *)src, length); + break; + } +#else +#error G_BYTE_ORDER set to G_PDP_ENDIAN is not supported by wave_encoder +#endif + + fifo_buffer_append(encoder->buffer, length); + return true; +} + +static size_t +wave_encoder_read(struct encoder *_encoder, void *dest, size_t length) +{ + WaveEncoder *encoder = (WaveEncoder *)_encoder; + + size_t max_length; + const void *src = fifo_buffer_read(encoder->buffer, &max_length); + if (src == NULL) + return 0; + + if (length > max_length) + length = max_length; + + memcpy(dest, src, length); + fifo_buffer_consume(encoder->buffer, length); + return length; +} + +static const char * +wave_encoder_get_mime_type(gcc_unused struct encoder *_encoder) +{ + return "audio/wav"; +} + +const struct encoder_plugin wave_encoder_plugin = { + "wave", + wave_encoder_init, + wave_encoder_finish, + wave_encoder_open, + wave_encoder_close, + nullptr, + nullptr, + nullptr, + nullptr, + wave_encoder_write, + wave_encoder_read, + wave_encoder_get_mime_type, +}; -- cgit v1.2.3