/src/speex/contrib/oss-fuzz/speexdec_fuzzer.cc

Source
/* Copyright (C) 2019 Tristan Matthews
   File: speexdec_fuzzer.cc (based on speexdec.c)

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   - Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

   - Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

   - Neither the name of the Xiph.org Foundation nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

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

#include <ogg/ogg.h>

#include <limits.h>
#include <math.h>

#include <string.h>
#include "speex/speex_header.h"
#include "speex/speex_stereo.h"
#include "speex/speex_callbacks.h"

#define MAX_FRAME_SIZE 2000

#ifndef DISABLE_FLOAT_API
    typedef float output_type;
    #define speex_decode_func(a, b, c) speex_decode(a, b, c)
    #define speex_decode_stereo_func(a, b, c) speex_decode_stereo(a, b, c)
#else
    typedef spx_int16_t output_type;
    #define speex_decode_func(a, b, c) speex_decode_int(a, b, c)
    #define speex_decode_stereo_func(a, b, c) speex_decode_stereo_int(a, b, c)
#endif

static void *process_header(ogg_packet *op, spx_int32_t enh_enabled, spx_int32_t *frame_size, int *granule_frame_size, spx_int32_t *rate, int *nframes, int *channels, SpeexStereoState *stereo, int *extra_headers)
{
   void *st;
   const SpeexMode *mode;
   SpeexHeader *header;
   int modeID;
   SpeexCallback callback;

   header = speex_packet_to_header((char*)op->packet, op->bytes);
   if (!header)
   {
      return NULL;
   }
   if (header->mode >= SPEEX_NB_MODES || header->mode<0)
   {
      free(header);
      return NULL;
   }

   modeID = header->mode;

   mode = speex_lib_get_mode (modeID);

   if (header->speex_version_id > 1)
   {
      free(header);
      return NULL;
   }

   if (mode->bitstream_version < header->mode_bitstream_version)
   {
      free(header);
      return NULL;
   }
   if (mode->bitstream_version > header->mode_bitstream_version)
   {
      free(header);
      return NULL;
   }

   st = speex_decoder_init(mode);
   if (!st)
   {
      free(header);
      return NULL;
   }
   speex_decoder_ctl(st, SPEEX_SET_ENH, &enh_enabled);
   speex_decoder_ctl(st, SPEEX_GET_FRAME_SIZE, frame_size);
   if (*frame_size < 0 || *frame_size > 2*320)
   {
      speex_decoder_destroy(st);
      free(header);
      return NULL;
   }
   *granule_frame_size = *frame_size;

   if (!*rate)
      *rate = header->rate;

   speex_decoder_ctl(st, SPEEX_SET_SAMPLING_RATE, rate);

   if (header->frames_per_packet < 1 ||  header->frames_per_packet > 10)
   {
      speex_decoder_destroy(st);
      free(header);
      return NULL;
   }
   *nframes = header->frames_per_packet;

   if (*channels==-1)
      *channels = header->nb_channels;

   if (!(*channels==1))
   {
      *channels = 2;
      callback.callback_id = SPEEX_INBAND_STEREO;
      callback.func = speex_std_stereo_request_handler;
      callback.data = stereo;
      speex_decoder_ctl(st, SPEEX_SET_HANDLER, &callback);
   }

   if (header->extra_headers > INT_MAX - 1)
   {
      speex_decoder_destroy(st);
      free(header);
      return NULL;
   }
   *extra_headers = header->extra_headers;

   free(header);
   return st;
}

static void cleanup(void *st, SpeexBits *bits, int stream_init, ogg_stream_state *os, ogg_sync_state *oy)
{
   if (st)
      speex_decoder_destroy(st);

   speex_bits_destroy(bits);
   if (stream_init)
      ogg_stream_clear(os);
   ogg_sync_clear(oy);
}


extern "C" int LLVMFuzzerTestOneInput(const uint8_t *fuzz_data, size_t fuzz_size)
{
   output_type output[MAX_FRAME_SIZE];
   int frame_size=0, granule_frame_size=0;
   void *st=NULL;
   SpeexBits bits;
   int packet_count=0;
   int stream_init = 0;
   ogg_int64_t page_granule=0, last_granule=0;
   int skip_samples=0, page_nb_packets;
   ogg_sync_state oy;
   ogg_page       og;
   ogg_packet     op;
   ogg_stream_state os;
   int enh_enabled;
   int nframes=2;
   int eos=0;
   SpeexStereoState stereo = SPEEX_STEREO_STATE_INIT;
   int channels=-1;
   int rate=0;
   int extra_headers=0;
   int lookahead;
   int speex_serialno = -1;

   enh_enabled = 1;

   /*Check fuzz_data meets size requirements*/
   if (fuzz_size > 4096)
      return 0;

   /*Init Ogg data struct*/
   ogg_sync_init(&oy);

   speex_bits_init(&bits);
   /*Main decoding loop*/

   ssize_t bytes_remaining = fuzz_size;
   while (1)
   {
      char *data;
      int j, nb_read;
      /*Get the ogg buffer for writing*/
      nb_read = bytes_remaining > 200 ? 200 : bytes_remaining;
      data = ogg_sync_buffer(&oy, nb_read);
      /*Read bitstream from data*/
      memcpy(data, fuzz_data, nb_read);
      ogg_sync_wrote(&oy, nb_read);
      bytes_remaining -= nb_read;

      /*Loop for all complete pages we got (most likely only one)*/
      while (ogg_sync_pageout(&oy, &og)==1)
      {
         int packet_no;

         if (stream_init == 0) {
            ogg_stream_init(&os, ogg_page_serialno(&og));
            stream_init = 1;
         }
         if (ogg_page_serialno(&og) != os.serialno) {
            /* so all streams are read. */
            ogg_stream_reset_serialno(&os, ogg_page_serialno(&og));
         }

         /*Add page to the bitstream*/
         ogg_stream_pagein(&os, &og);
         page_granule = ogg_page_granulepos(&og);
         page_nb_packets = ogg_page_packets(&og);
         if (page_granule>0 && frame_size && (last_granule > 0 || INT64_MAX + last_granule > page_granule))
         {
            /* FIXME: shift the granule values if --force-* is specified */
            int64_t a = page_nb_packets*granule_frame_size*(int64_t)nframes;
            int64_t b = page_granule - last_granule;
            if (b > a || (INT64_MAX/640 - a < -b) || (a - b) > INT64_MAX/640)
            {
               cleanup(st, &bits, stream_init, &os, &oy);
               return 0;
            }
            skip_samples = frame_size*(int64_t)(a - b)/granule_frame_size;
            if (skip_samples == INT_MIN) {
               cleanup(st, &bits, stream_init, &os, &oy);
               return 0;
            }
            if (ogg_page_eos(&og))
               skip_samples = -skip_samples;
            /*else if (!ogg_page_bos(&og))
               skip_samples = 0;*/
         } else if (page_granule<-1) {
            cleanup(st, &bits, stream_init, &os, &oy);
            return 0;
         } else {
            skip_samples = 0;
         }
         last_granule = page_granule;
         /*Extract all available packets*/
         packet_no=0;
         while (!eos && ogg_stream_packetout(&os, &op) == 1)
         {
            if (op.bytes>=5 && !memcmp(op.packet, "Speex", 5)) {
               speex_serialno = os.serialno;
            }
            if (speex_serialno == -1 || os.serialno != speex_serialno)
               break;
            /*If first packet, process as Speex header*/
            if (packet_count==0)
            {
               st = process_header(&op, enh_enabled, &frame_size, &granule_frame_size, &rate, &nframes, &channels, &stereo, &extra_headers);
               if (!st)
               {
                 cleanup(st, &bits, stream_init, &os, &oy);
                 return 0;
               }
               speex_decoder_ctl(st, SPEEX_GET_LOOKAHEAD, &lookahead);
               if (!nframes)
                  nframes=1;

            } else if (packet_count<=1+extra_headers)
            {
               /* Ignore extra headers */
            } else {
               packet_no++;

               /*End of stream condition*/
               if (op.e_o_s && os.serialno == speex_serialno) /* don't care for anything except speex eos */
                  eos=1;

               /*Copy Ogg packet to Speex bitstream*/
               speex_bits_read_from(&bits, (char*)op.packet, op.bytes);
               for (j=0;j!=nframes;j++)
               {
                  int ret;
                  /*Decode frame*/
                  ret = speex_decode_func(st, &bits, output);

                  if (ret==-1)
                     break;
                  if (ret==-2)
                  {
                     break;
                  }
                  if (speex_bits_remaining(&bits)<0)
                  {
                     break;
                  }
                  if (channels==2)
                     speex_decode_stereo_func(output, frame_size, &stereo);

                  if (INT_MAX - lookahead > skip_samples)
                  {
                     int new_frame_size = frame_size;
                     if (packet_no == 1 && j==0 && skip_samples > 0)
                     {
                        new_frame_size -= skip_samples+lookahead;
                     }
                     if (packet_no == page_nb_packets && skip_samples < 0)
                     {
                        int packet_length = nframes*frame_size+skip_samples+lookahead;
                        new_frame_size = packet_length - j*frame_size;
                        if (new_frame_size<0)
                           new_frame_size = 0;
                        if (new_frame_size>frame_size)
                           new_frame_size = frame_size;
                     }
                  }
               }
            }
            packet_count++;
         }
      }
      if (bytes_remaining <= 0)
         break;
   }

   cleanup(st, &bits, stream_init, &os, &oy);

   return 0;
}

Coverage Report

Created: 2025-12-31 06:21

Line	Count	Source
1		/* Copyright (C) 2019 Tristan Matthews
2		File: speexdec_fuzzer.cc (based on speexdec.c)
3
4		Redistribution and use in source and binary forms, with or without
5		modification, are permitted provided that the following conditions
6		are met:
7
8		- Redistributions of source code must retain the above copyright
9		notice, this list of conditions and the following disclaimer.
10
11		- Redistributions in binary form must reproduce the above copyright
12		notice, this list of conditions and the following disclaimer in the
13		documentation and/or other materials provided with the distribution.
14
15		- Neither the name of the Xiph.org Foundation nor the names of its
16		contributors may be used to endorse or promote products derived from
17		this software without specific prior written permission.
18
19		THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20		``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21		LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22		A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
23		CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24		EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25		PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26		PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27		LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28		NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29		SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30		*/
31
32		#ifdef HAVE_CONFIG_H
33		# include "config.h"
34		#endif
35
36		#include <stdio.h>
37		#include <unistd.h>
38		#include <stdlib.h>
39		#include <string.h>
40
41		#include <ogg/ogg.h>
42
43		#include <limits.h>
44		#include <math.h>
45
46		#include <string.h>
47		#include "speex/speex_header.h"
48		#include "speex/speex_stereo.h"
49		#include "speex/speex_callbacks.h"
50
51		#define MAX_FRAME_SIZE 2000
52
53		#ifndef DISABLE_FLOAT_API
54		typedef float output_type;
55	63.4k	#define speex_decode_func(a, b, c) speex_decode(a, b, c)
56	10.7k	#define speex_decode_stereo_func(a, b, c) speex_decode_stereo(a, b, c)
57		#else
58		typedef spx_int16_t output_type;
59		#define speex_decode_func(a, b, c) speex_decode_int(a, b, c)
60		#define speex_decode_stereo_func(a, b, c) speex_decode_stereo_int(a, b, c)
61		#endif
62
63		static void process_header(ogg_packet op, spx_int32_t enh_enabled, spx_int32_t frame_size, int granule_frame_size, spx_int32_t rate, int nframes, int channels, SpeexStereoState stereo, int *extra_headers)
64	4.34k	{
65	4.34k	void *st;
66	4.34k	const SpeexMode *mode;
67	4.34k	SpeexHeader *header;
68	4.34k	int modeID;
69	4.34k	SpeexCallback callback;
70
71	4.34k	header = speex_packet_to_header((char*)op->packet, op->bytes);
72	4.34k	if (!header)
73	282	{
74	282	return NULL;
75	282	}
76	4.06k	if (header->mode >= SPEEX_NB_MODES \|\| header->mode<0)
77	0	{
78	0	free(header);
79	0	return NULL;
80	0	}
81
82	4.06k	modeID = header->mode;
83
84	4.06k	mode = speex_lib_get_mode (modeID);
85
86	4.06k	if (header->speex_version_id > 1)
87	11	{
88	11	free(header);
89	11	return NULL;
90	11	}
91
92	4.05k	if (mode->bitstream_version < header->mode_bitstream_version)
93	41	{
94	41	free(header);
95	41	return NULL;
96	41	}
97	4.01k	if (mode->bitstream_version > header->mode_bitstream_version)
98	119	{
99	119	free(header);
100	119	return NULL;
101	119	}
102
103	3.89k	st = speex_decoder_init(mode);
104	3.89k	if (!st)
105	0	{
106	0	free(header);
107	0	return NULL;
108	0	}
109	3.89k	speex_decoder_ctl(st, SPEEX_SET_ENH, &enh_enabled);
110	3.89k	speex_decoder_ctl(st, SPEEX_GET_FRAME_SIZE, frame_size);
111	3.89k	if (frame_size < 0 \|\| frame_size > 2*320)
112	0	{
113	0	speex_decoder_destroy(st);
114	0	free(header);
115	0	return NULL;
116	0	}
117	3.89k	granule_frame_size = frame_size;
118
119	3.89k	if (!*rate)
120	3.89k	*rate = header->rate;
121
122	3.89k	speex_decoder_ctl(st, SPEEX_SET_SAMPLING_RATE, rate);
123
124	3.89k	if (header->frames_per_packet < 1 \|\| header->frames_per_packet > 10)
125	159	{
126	159	speex_decoder_destroy(st);
127	159	free(header);
128	159	return NULL;
129	159	}
130	3.73k	*nframes = header->frames_per_packet;
131
132	3.73k	if (*channels==-1)
133	3.73k	*channels = header->nb_channels;
134
135	3.73k	if (!(*channels==1))
136	1.94k	{
137	1.94k	*channels = 2;
138	1.94k	callback.callback_id = SPEEX_INBAND_STEREO;
139	1.94k	callback.func = speex_std_stereo_request_handler;
140	1.94k	callback.data = stereo;
141	1.94k	speex_decoder_ctl(st, SPEEX_SET_HANDLER, &callback);
142	1.94k	}
143
144	3.73k	if (header->extra_headers > INT_MAX - 1)
145	2	{
146	2	speex_decoder_destroy(st);
147	2	free(header);
148	2	return NULL;
149	2	}
150	3.73k	*extra_headers = header->extra_headers;
151
152	3.73k	free(header);
153	3.73k	return st;
154	3.73k	}
155
156		static void cleanup(void st, SpeexBits bits, int stream_init, ogg_stream_state os, ogg_sync_state oy)
157	5.95k	{
158	5.95k	if (st)
159	3.73k	speex_decoder_destroy(st);
160
161	5.95k	speex_bits_destroy(bits);
162	5.95k	if (stream_init)
163	5.71k	ogg_stream_clear(os);
164	5.95k	ogg_sync_clear(oy);
165	5.95k	}
166
167
168		extern "C" int LLVMFuzzerTestOneInput(const uint8_t *fuzz_data, size_t fuzz_size)
169	5.96k	{
170	5.96k	output_type output[MAX_FRAME_SIZE];
171	5.96k	int frame_size=0, granule_frame_size=0;
172	5.96k	void *st=NULL;
173	5.96k	SpeexBits bits;
174	5.96k	int packet_count=0;
175	5.96k	int stream_init = 0;
176	5.96k	ogg_int64_t page_granule=0, last_granule=0;
177	5.96k	int skip_samples=0, page_nb_packets;
178	5.96k	ogg_sync_state oy;
179	5.96k	ogg_page og;
180	5.96k	ogg_packet op;
181	5.96k	ogg_stream_state os;
182	5.96k	int enh_enabled;
183	5.96k	int nframes=2;
184	5.96k	int eos=0;
185	5.96k	SpeexStereoState stereo = SPEEX_STEREO_STATE_INIT;
186	5.96k	int channels=-1;
187	5.96k	int rate=0;
188	5.96k	int extra_headers=0;
189	5.96k	int lookahead;
190	5.96k	int speex_serialno = -1;
191
192	5.96k	enh_enabled = 1;
193
194		/Check fuzz_data meets size requirements/
195	5.96k	if (fuzz_size > 4096)
196	11	return 0;
197
198		/Init Ogg data struct/
199	5.95k	ogg_sync_init(&oy);
200
201	5.95k	speex_bits_init(&bits);
202		/Main decoding loop/
203
204	5.95k	ssize_t bytes_remaining = fuzz_size;
205	12.0k	while (1)
206	12.0k	{
207	12.0k	char *data;
208	12.0k	int j, nb_read;
209		/Get the ogg buffer for writing/
210	12.0k	nb_read = bytes_remaining > 200 ? 200 : bytes_remaining;
211	12.0k	data = ogg_sync_buffer(&oy, nb_read);
212		/Read bitstream from data/
213	12.0k	memcpy(data, fuzz_data, nb_read);
214	12.0k	ogg_sync_wrote(&oy, nb_read);
215	12.0k	bytes_remaining -= nb_read;
216
217		/Loop for all complete pages we got (most likely only one)/
218	30.7k	while (ogg_sync_pageout(&oy, &og)==1)
219	20.1k	{
220	20.1k	int packet_no;
221
222	20.1k	if (stream_init == 0) {
223	5.71k	ogg_stream_init(&os, ogg_page_serialno(&og));
224	5.71k	stream_init = 1;
225	5.71k	}
226	20.1k	if (ogg_page_serialno(&og) != os.serialno) {
227		/* so all streams are read. */
228	6.71k	ogg_stream_reset_serialno(&os, ogg_page_serialno(&og));
229	6.71k	}
230
231		/Add page to the bitstream/
232	20.1k	ogg_stream_pagein(&os, &og);
233	20.1k	page_granule = ogg_page_granulepos(&og);
234	20.1k	page_nb_packets = ogg_page_packets(&og);
235	20.1k	if (page_granule>0 && frame_size && (last_granule > 0 \|\| INT64_MAX + last_granule > page_granule))
236	3.45k	{
237		/* FIXME: shift the granule values if --force-* is specified */
238	3.45k	int64_t a = page_nb_packetsgranule_frame_size(int64_t)nframes;
239	3.45k	int64_t b = page_granule - last_granule;
240	3.45k	if (b > a \|\| (INT64_MAX/640 - a < -b) \|\| (a - b) > INT64_MAX/640)
241	393	{
242	393	cleanup(st, &bits, stream_init, &os, &oy);
243	393	return 0;
244	393	}
245	3.06k	skip_samples = frame_size*(int64_t)(a - b)/granule_frame_size;
246	3.06k	if (skip_samples == INT_MIN) {
247	2	cleanup(st, &bits, stream_init, &os, &oy);
248	2	return 0;
249	2	}
250	3.06k	if (ogg_page_eos(&og))
251	514	skip_samples = -skip_samples;
252		/*else if (!ogg_page_bos(&og))
253		skip_samples = 0;*/
254	16.6k	} else if (page_granule<-1) {
255	349	cleanup(st, &bits, stream_init, &os, &oy);
256	349	return 0;
257	16.3k	} else {
258	16.3k	skip_samples = 0;
259	16.3k	}
260	19.4k	last_granule = page_granule;
261		/Extract all available packets/
262	19.4k	packet_no=0;
263	73.6k	while (!eos && ogg_stream_packetout(&os, &op) == 1)
264	58.5k	{
265	58.5k	if (op.bytes>=5 && !memcmp(op.packet, "Speex", 5)) {
266	6.38k	speex_serialno = os.serialno;
267	6.38k	}
268	58.5k	if (speex_serialno == -1 \|\| os.serialno != speex_serialno)
269	3.65k	break;
270		/If first packet, process as Speex header/
271	54.8k	if (packet_count==0)
272	4.34k	{
273	4.34k	st = process_header(&op, enh_enabled, &frame_size, &granule_frame_size, &rate, &nframes, &channels, &stereo, &extra_headers);
274	4.34k	if (!st)
275	614	{
276	614	cleanup(st, &bits, stream_init, &os, &oy);
277	614	return 0;
278	614	}
279	3.73k	speex_decoder_ctl(st, SPEEX_GET_LOOKAHEAD, &lookahead);
280	3.73k	if (!nframes)
281	0	nframes=1;
282
283	50.5k	} else if (packet_count<=1+extra_headers)
284	4.45k	{
285		/* Ignore extra headers */
286	46.0k	} else {
287	46.0k	packet_no++;
288
289		/End of stream condition/
290	46.0k	if (op.e_o_s && os.serialno == speex_serialno) /* don't care for anything except speex eos */
291	805	eos=1;
292
293		/Copy Ogg packet to Speex bitstream/
294	46.0k	speex_bits_read_from(&bits, (char*)op.packet, op.bytes);
295	64.5k	for (j=0;j!=nframes;j++)
296	63.4k	{
297	63.4k	int ret;
298		/Decode frame/
299	63.4k	ret = speex_decode_func(st, &bits, output);
300
301	63.4k	if (ret==-1)
302	13.4k	break;
303	50.0k	if (ret==-2)
304	5.67k	{
305	5.67k	break;
306	5.67k	}
307	44.3k	if (speex_bits_remaining(&bits)<0)
308	25.8k	{
309	25.8k	break;
310	25.8k	}
311	18.4k	if (channels==2)
312	10.7k	speex_decode_stereo_func(output, frame_size, &stereo);
313
314	18.4k	if (INT_MAX - lookahead > skip_samples)
315	18.4k	{
316	18.4k	int new_frame_size = frame_size;
317	18.4k	if (packet_no == 1 && j==0 && skip_samples > 0)
318	94	{
319	94	new_frame_size -= skip_samples+lookahead;
320	94	}
321	18.4k	if (packet_no == page_nb_packets && skip_samples < 0)
322	4	{
323	4	int packet_length = nframes*frame_size+skip_samples+lookahead;
324	4	new_frame_size = packet_length - j*frame_size;
325	4	if (new_frame_size<0)
326	4	new_frame_size = 0;
327	4	if (new_frame_size>frame_size)
328	0	new_frame_size = frame_size;
329	4	}
330	18.4k	}
331	18.4k	}
332	46.0k	}
333	54.2k	packet_count++;
334	54.2k	}
335	19.4k	}
336	10.6k	if (bytes_remaining <= 0)
337	4.59k	break;
338	10.6k	}
339
340	4.59k	cleanup(st, &bits, stream_init, &os, &oy);
341
342	4.59k	return 0;
343	5.95k	}