diff options
Diffstat (limited to 'src/encoder')
| -rw-r--r-- | src/encoder/wave_encoder.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/src/encoder/wave_encoder.c b/src/encoder/wave_encoder.c new file mode 100644 index 000000000..f06dea307 --- /dev/null +++ b/src/encoder/wave_encoder.c @@ -0,0 +1,241 @@ +/* + * Copyright (C) 2003-2009 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 "encoder_api.h" +#include "encoder_plugin.h" + +#include <assert.h> +#include <string.h> + +#define MAX_BUFFER 32768 + +struct wave_encoder { + struct encoder encoder; + unsigned bits; + + uint8_t buffer[MAX_BUFFER]; + size_t buffer_length; +}; + +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 inline GQuark +wave_encoder_quark(void) +{ + return g_quark_from_static_string("wave_encoder"); +} + +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(G_GNUC_UNUSED const struct config_param *param, + G_GNUC_UNUSED GError **error) +{ + struct wave_encoder *encoder; + + encoder = g_new(struct wave_encoder, 1); + encoder_struct_init(&encoder->encoder, &wave_encoder_plugin); + + return &encoder->encoder; +} + +static void +wave_encoder_finish(struct encoder *_encoder) +{ + struct wave_encoder *encoder = (struct wave_encoder *)_encoder; + + g_free(encoder); +} + +static bool +wave_encoder_open(struct encoder *_encoder, + G_GNUC_UNUSED struct audio_format *audio_format, + G_GNUC_UNUSED GError **error) +{ + struct wave_encoder *encoder = (struct wave_encoder *)_encoder; + + encoder->bits = audio_format->bits; + + /* create PCM wave header in initial buffer */ + fill_wave_header((struct wave_header *) encoder->buffer, + audio_format->channels, + audio_format->bits, + audio_format->sample_rate, + (audio_format->bits / 8) * audio_format->channels ); + + encoder->buffer_length = sizeof(struct wave_header); + return true; +} + +static inline size_t +pcm16_to_wave(void *dst, const void *src, size_t length) +{ + uint32_t scnt; + const uint16_t *src16 = (const uint16_t *) src; + uint16_t *dst16 = (uint16_t *) dst; + + for(scnt = length >> 1; scnt>0; scnt--){ + *dst16++ = GUINT16_TO_LE(*src16++); + } + return length; +} + +static inline size_t +pcm32_to_wave(void *dst, const void *src, size_t length) +{ + uint32_t scnt; + const uint32_t *src32 = (const uint32_t *) src; + uint32_t *dst32 = (uint32_t *) dst; + + for(scnt = length >> 2; scnt>0; scnt--){ + *dst32++ = GUINT32_TO_LE(*src32++); + } + return length; +} + +static inline size_t +pcm24_to_wave(void *dst, const void *src, size_t length) +{ + uint32_t scnt, value; + const uint32_t *src32 = (const uint32_t *) src; + uint8_t *dst8 = (uint8_t *) dst; + + for(scnt = length >> 2; scnt>0; scnt--){ + value = *src32++; + *dst8++ = (value) & 0xFF; + *dst8++ = (value >> 8) & 0xFF; + *dst8++ = (value >> 16) & 0xFF; + } + //correct buffer length + length = dst8 - ((uint8_t *)dst); + return length; +} + +static bool +wave_encoder_write(struct encoder *_encoder, + const void *src, size_t length, + G_GNUC_UNUSED GError **error) +{ + struct wave_encoder *encoder = (struct wave_encoder *)_encoder; + void *dst; + + assert(length + encoder->buffer_length < MAX_BUFFER); + + dst = encoder->buffer + 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, 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, src, length); + break; + case 24: + length = pcm24_to_wave(dst, src, length); + break; + case 32: + length = pcm32_to_wave(dst, src, length); + break; + } +#else +#error G_BYTE_ORDER set to G_PDP_ENDIAN is not supported by wave_encoder +#endif + + encoder->buffer_length += length; + return true; +} + +static size_t +wave_encoder_read(struct encoder *_encoder, void *dest, size_t length) +{ + struct wave_encoder *encoder = (struct wave_encoder *)_encoder; + + if (length > encoder->buffer_length) + length = encoder->buffer_length; + + memcpy(dest, encoder->buffer, length); + + encoder->buffer_length -= length; + memmove(encoder->buffer, encoder->buffer + length, + encoder->buffer_length); + + return length; +} + +const struct encoder_plugin wave_encoder_plugin = { + .name = "wave", + .init = wave_encoder_init, + .finish = wave_encoder_finish, + .open = wave_encoder_open, + .write = wave_encoder_write, + .read = wave_encoder_read, +}; |