/* * 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, };