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Diffstat (limited to 'src/encoder/plugins/WaveEncoderPlugin.cxx')
| -rw-r--r-- | src/encoder/plugins/WaveEncoderPlugin.cxx | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/src/encoder/plugins/WaveEncoderPlugin.cxx b/src/encoder/plugins/WaveEncoderPlugin.cxx new file mode 100644 index 000000000..97a26e821 --- /dev/null +++ b/src/encoder/plugins/WaveEncoderPlugin.cxx @@ -0,0 +1,265 @@ +/* + * Copyright (C) 2003-2014 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 "../EncoderAPI.hxx" +#include "system/ByteOrder.hxx" +#include "util/Manual.hxx" +#include "util/DynamicFifoBuffer.hxx" + +#include <assert.h> +#include <string.h> + +struct WaveEncoder { + Encoder encoder; + unsigned bits; + + Manual<DynamicFifoBuffer<uint8_t>> buffer; + + WaveEncoder():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; +}; + +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 = ToLE32(0x46464952); + header->id_wave = ToLE32(0x45564157); + header->id_fmt = ToLE32(0x20746d66); + header->id_data = ToLE32(0x61746164); + + /* wave format */ + header->format = ToLE16(1); // PCM_FORMAT + header->channels = ToLE16(channels); + header->bits = ToLE16(bits); + header->freq = ToLE32(freq); + header->blocksize = ToLE16(block_size); + header->byterate = ToLE32(freq * block_size); + + /* chunk sizes (fake data length) */ + header->fmt_size = ToLE32(16); + header->data_size = ToLE32(data_size); + header->riff_size = ToLE32(4 + (8 + 16) + (8 + data_size)); +} + +static Encoder * +wave_encoder_init(gcc_unused const config_param ¶m, + gcc_unused Error &error) +{ + WaveEncoder *encoder = new WaveEncoder(); + return &encoder->encoder; +} + +static void +wave_encoder_finish(Encoder *_encoder) +{ + WaveEncoder *encoder = (WaveEncoder *)_encoder; + + delete encoder; +} + +static bool +wave_encoder_open(Encoder *_encoder, + AudioFormat &audio_format, + gcc_unused Error &error) +{ + WaveEncoder *encoder = (WaveEncoder *)_encoder; + + assert(audio_format.IsValid()); + + switch (audio_format.format) { + case SampleFormat::S8: + encoder->bits = 8; + break; + + case SampleFormat::S16: + encoder->bits = 16; + break; + + case SampleFormat::S24_P32: + encoder->bits = 24; + break; + + case SampleFormat::S32: + encoder->bits = 32; + break; + + default: + audio_format.format = SampleFormat::S16; + encoder->bits = 16; + break; + } + + encoder->buffer.Construct(8192); + + auto range = encoder->buffer->Write(); + assert(range.size >= sizeof(wave_header)); + wave_header *header = (wave_header *)range.data; + + /* 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); + + encoder->buffer->Append(sizeof(*header)); + + return true; +} + +static void +wave_encoder_close(Encoder *_encoder) +{ + WaveEncoder *encoder = (WaveEncoder *)_encoder; + + encoder->buffer.Destruct(); +} + +static size_t +pcm16_to_wave(uint16_t *dst16, const uint16_t *src16, size_t length) +{ + size_t cnt = length >> 1; + while (cnt > 0) { + *dst16++ = ToLE16(*src16++); + cnt--; + } + return length; +} + +static size_t +pcm32_to_wave(uint32_t *dst32, const uint32_t *src32, size_t length) +{ + size_t cnt = length >> 2; + while (cnt > 0){ + *dst32++ = ToLE32(*src32++); + cnt--; + } + return length; +} + +static 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(Encoder *_encoder, + const void *src, size_t length, + gcc_unused Error &error) +{ + WaveEncoder *encoder = (WaveEncoder *)_encoder; + + uint8_t *dst = encoder->buffer->Write(length); + + if (IsLittleEndian()) { + 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; + } + } else { + switch (encoder->bits) { + case 8: + memcpy(dst, src, length); + break; + case 16: + length = pcm16_to_wave((uint16_t *)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((uint32_t *)dst, + (const uint32_t *)src, length); + break; + } + } + + encoder->buffer->Append(length); + return true; +} + +static size_t +wave_encoder_read(Encoder *_encoder, void *dest, size_t length) +{ + WaveEncoder *encoder = (WaveEncoder *)_encoder; + + return encoder->buffer->Read((uint8_t *)dest, length); +} + +static const char * +wave_encoder_get_mime_type(gcc_unused Encoder *_encoder) +{ + return "audio/wav"; +} + +const EncoderPlugin 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, +}; 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