format_vorbis.c 3 KB
Newer Older
Jack Moffitt's avatar
Jack Moffitt committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
/* format_vorbis.c
**
** format plugin for vorbis
**
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <ogg/ogg.h>
#include <vorbis/codec.h>

#include "refbuf.h"

#include "format.h"

typedef struct _vstate_tag
{
	ogg_sync_state oy;
	ogg_page og;
	unsigned long serialno;
	int header;
	refbuf_t *headbuf[10];
} vstate_t;

27
void format_vorbis_free_plugin(format_plugin_t *self);
Jack Moffitt's avatar
Jack Moffitt committed
28 29 30 31 32 33 34 35 36
refbuf_t *format_vorbis_get_buffer(format_plugin_t *self, char *data, unsigned long len);
refbuf_queue_t *format_vorbis_get_predata(format_plugin_t *self);

format_plugin_t *format_vorbis_get_plugin(void)
{
	format_plugin_t *plugin;
	vstate_t *state;

	plugin = (format_plugin_t *)malloc(sizeof(format_plugin_t));
37

Jack Moffitt's avatar
Jack Moffitt committed
38 39 40 41
	plugin->type = FORMAT_TYPE_VORBIS;
	plugin->has_predata = 1;
	plugin->get_buffer = format_vorbis_get_buffer;
	plugin->get_predata = format_vorbis_get_predata;
42
	plugin->free_plugin = format_vorbis_free_plugin;
Jack Moffitt's avatar
Jack Moffitt committed
43 44 45 46 47 48 49 50 51

	state = (vstate_t *)calloc(1, sizeof(vstate_t));
	ogg_sync_init(&state->oy);

	plugin->_state = (void *)state;

	return plugin;
}

52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74
void format_vorbis_free_plugin(format_plugin_t *self)
{
	int i;
	vstate_t *state = (vstate_t *)self->_state;

	/* free memory associated with this plugin instance */

	/* free state memory */
	ogg_sync_clear(&state->oy);
	
	for (i = 0; i < 10; i++) {
		if (state->headbuf[i]) {
			refbuf_release(state->headbuf[i]);
			state->headbuf[i] = NULL;
		}
	}

	free(state);

	/* free the plugin instance */
	free(self);
}

Jack Moffitt's avatar
Jack Moffitt committed
75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146
refbuf_t *format_vorbis_get_buffer(format_plugin_t *self, char *data, unsigned long len)
{
	char *buffer;
	refbuf_t *refbuf;
	int i;
	vstate_t *state = (vstate_t *)self->_state;

	if (data) {
		/* write the data to the buffer */
		buffer = ogg_sync_buffer(&state->oy, len);
	        memcpy(buffer, data, len);
		ogg_sync_wrote(&state->oy, len);
	}

	refbuf = NULL;
	if (ogg_sync_pageout(&state->oy, &state->og) == 1) {
		refbuf = refbuf_new(state->og.header_len + state->og.body_len);
		memcpy(refbuf->data, state->og.header, state->og.header_len);
		memcpy(&refbuf->data[state->og.header_len], state->og.body, state->og.body_len);

		if (state->serialno != ogg_page_serialno(&state->og)) {
			/* this is a new logical bitstream */
			state->header = 0;
			for (i = 0; i < 10; i++) {
				if (state->headbuf[i]) {
					refbuf_release(state->headbuf[i]);
					state->headbuf[i] = NULL;
				}
			}
					
			state->serialno = ogg_page_serialno(&state->og);
		}

		if (state->header >= 0) {
			if (ogg_page_granulepos(&state->og) == 0) {
				state->header++;
			} else {
				state->header = 0;
			}
		}

		/* cache first three pages */
		if (state->header) {
			refbuf_addref(refbuf);
			state->headbuf[state->header - 1] = refbuf;
		}
	}

	return refbuf;
}

refbuf_queue_t *format_vorbis_get_predata(format_plugin_t *self)
{
	refbuf_queue_t *queue;
	int i;
	vstate_t *state = (vstate_t *)self->_state;

	queue = NULL;
	for (i = 0; i < 10; i++) {
		if (state->headbuf[i]) {
			refbuf_addref(state->headbuf[i]);
			refbuf_queue_add(&queue, state->headbuf[i]);
		} else {
			break;
		}
	}

	return queue;
}