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chrome_ogg_encoder/ogg_encoder.c
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/* (c) 2015 Felipe Astroza A. | |
* Under BSD License | |
*/ | |
#include <stdio.h> | |
#include <time.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <vorbis/vorbisenc.h> | |
struct ogg_encoder { | |
ogg_stream_state os; | |
vorbis_info vi; | |
vorbis_comment vc; | |
vorbis_dsp_state vd; | |
vorbis_block vb; | |
ogg_packet op; | |
}; | |
/* write_data is implemented in JavaScript */ | |
extern void write_data(unsigned char *buffer, unsigned int buffer_size); | |
struct ogg_encoder *ogg_encoder_init(int sample_rate, float vbr_quality) | |
{ | |
struct ogg_encoder *encoder = (struct ogg_encoder *)malloc(sizeof(struct ogg_encoder)); | |
ogg_packet header; | |
ogg_packet header_comm; | |
ogg_packet header_code; | |
ogg_page og; | |
vorbis_info_init(&encoder->vi); | |
if(vorbis_encode_init_vbr(&encoder->vi, 2, sample_rate, vbr_quality)) { | |
free(encoder); | |
return NULL; | |
} | |
vorbis_comment_init(&encoder->vc); | |
vorbis_comment_add_tag(&encoder->vc, "OggEncoderJS", "Ogg vorbis encoder"); | |
vorbis_analysis_init(&encoder->vd, &encoder->vi); | |
vorbis_block_init(&encoder->vd, &encoder->vb); | |
srand(time(NULL)); | |
ogg_stream_init(&encoder->os, rand()); | |
vorbis_analysis_headerout(&encoder->vd, &encoder->vc, &header, &header_comm, &header_code); | |
ogg_stream_packetin(&encoder->os, &header); | |
ogg_stream_packetin(&encoder->os, &header_comm); | |
ogg_stream_packetin(&encoder->os, &header_code); | |
while(ogg_stream_flush(&encoder->os, &og)) { | |
write_data(og.header, og.header_len); | |
write_data(og.body, og.body_len); | |
} | |
return encoder; | |
} | |
static void _ogg_encoder_write(struct ogg_encoder *encoder, int samples_count) | |
{ | |
int finish = samples_count == 0? 1 : 0; | |
vorbis_analysis_wrote(&encoder->vd, samples_count); | |
ogg_page og; | |
while(vorbis_analysis_blockout(&encoder->vd, &encoder->vb) == 1) | |
{ | |
vorbis_analysis(&encoder->vb, NULL); | |
vorbis_bitrate_addblock(&encoder->vb); | |
while(vorbis_bitrate_flushpacket(&encoder->vd, &encoder->op)) | |
{ | |
ogg_stream_packetin(&encoder->os, &encoder->op); | |
while((!finish && ogg_stream_pageout(&encoder->os, &og)) || ( (finish || encoder->op.e_o_s) && ogg_stream_flush(&encoder->os, &og))) | |
{ | |
write_data(og.header, og.header_len); | |
write_data(og.body, og.body_len); | |
} | |
} | |
} | |
} | |
void ogg_encoder_write(struct ogg_encoder *encoder, float *buffer_left, float *buffer_right, int samples_count) | |
{ | |
float **buffer = vorbis_analysis_buffer(&encoder->vd, samples_count); | |
int i; | |
for(i = 0; i < samples_count; i++) { | |
buffer[0][i] = buffer_left[i]; | |
buffer[1][i] = buffer_right[i]; | |
} | |
_ogg_encoder_write(encoder, samples_count); | |
} | |
void ogg_encoder_finish(struct ogg_encoder *encoder) | |
{ | |
_ogg_encoder_write(encoder, 0); | |
ogg_stream_clear(&encoder->os); | |
vorbis_block_clear(&encoder->vb); | |
vorbis_dsp_clear(&encoder->vd); | |
vorbis_comment_clear(&encoder->vc); | |
vorbis_info_clear(&encoder->vi); | |
} |