/** \file aac_afh.c para_server's aac audio format handler */
-#include "server.cmdline.h"
#include "server.h"
-#include "vss.h"
#include "error.h"
#include "string.h"
#include "aac.h"
-#include "fd.h"
-/** size of the input buffer, must be big enough to hold header */
-#define AAC_INBUF_SIZE 65536
-
-static FILE *infile;
-
-static void aac_close_audio_file(void)
-{
- if (!infile)
- return;
- fclose(infile);
- infile = NULL;
-}
-
-static int aac_find_stsz(unsigned char *buf, unsigned buflen, size_t *skip)
+static int aac_find_stsz(unsigned char *buf, size_t buflen, off_t *skip)
{
int i;
*skip = i;
return sample_count;
}
- PARA_WARNING_LOG("stsz not found, buflen: %d\n", buflen);
return -E_STSZ;
}
-static int read_chunk_table(struct audio_format_info *afi, unsigned char *inbuf,
- size_t inbuf_len, size_t skip)
+static ssize_t aac_compute_chunk_table(struct audio_format_info *afi,
+ unsigned char *map, size_t numbytes)
{
int ret, i;
size_t sum = 0;
+ off_t skip;
- for (;;) {
- ret = aac_find_stsz(inbuf, inbuf_len, &skip);
- if (ret >= 0)
- break;
- ret = read(fileno(infile), inbuf, AAC_INBUF_SIZE);
- if (ret <= 0)
- return -E_AAC_READ;
- inbuf_len = ret;
- PARA_INFO_LOG("next buffer: %d bytes\n", ret);
- }
+ ret = aac_find_stsz(map, numbytes, &skip);
+ if (ret < 0)
+ return ret;
afi->chunks_total = ret;
PARA_INFO_LOG("sz table has %lu entries\n", afi->chunks_total);
afi->chunk_table = para_malloc((afi->chunks_total + 1) * sizeof(size_t));
for (i = 1; i <= afi->chunks_total; i++) {
- if (skip + 4 > inbuf_len) {
- skip = inbuf_len - skip;
- memmove(inbuf, inbuf + inbuf_len - skip, skip);
- ret = read(fileno(infile), inbuf + skip,
- AAC_INBUF_SIZE - skip);
- if (ret <= 0)
- return -E_AAC_READ;
- inbuf_len = ret + skip;
- skip = 0;
- PARA_INFO_LOG("next buffer: %zu bytes\n", inbuf_len);
- }
- sum += aac_read_int32(inbuf + skip);
+ if (skip + 4 > numbytes)
+ break;
+ sum += aac_read_int32(map + skip);
afi->chunk_table[i] = sum;
skip += 4;
- if (i < 10 || i + 10 > afi->chunks_total)
- PARA_DEBUG_LOG("offset #%d: %zu\n", i, afi->chunk_table[i]);
+// if (i < 10 || i + 10 > afi->chunks_total)
+// PARA_DEBUG_LOG("offset #%d: %zu\n", i, afi->chunk_table[i]);
}
- return 1;
+ return skip;
}
-static long unsigned aac_set_chunk_tv(struct audio_format_info *afi,
- mp4AudioSpecificConfig *mp4ASC)
+static int aac_set_chunk_tv(struct audio_format_info *afi,
+ mp4AudioSpecificConfig *mp4ASC, long unsigned *seconds)
{
- float tmp = mp4ASC->sbr_present_flag == 1? 2047 : 1023,
- ms = 1000.0 * afi->chunks_total * tmp / mp4ASC->samplingFrequency;
+ float tmp = mp4ASC->sbr_present_flag == 1? 2047 : 1023;
struct timeval total;
+ long unsigned ms = 1000.0 * afi->chunks_total * tmp
+ / mp4ASC->samplingFrequency;
+ if (!mp4ASC->samplingFrequency)
+ return -E_MP4ASC;
+ ms = 1000.0 * afi->chunks_total * tmp / mp4ASC->samplingFrequency;
ms2tv(ms, &total);
tv_divide(afi->chunks_total, &total, &afi->chunk_tv);
- PARA_INFO_LOG("%luHz, %fs (%lu x %lums)\n",
+ PARA_INFO_LOG("%luHz, %lus (%lu x %lums)\n",
mp4ASC->samplingFrequency, ms / 1000,
afi->chunks_total, tv2ms(&afi->chunk_tv));
- return ms / 1000;
+ if (ms < 1000)
+ return -E_MP4ASC;
+ *seconds = ms / 1000;
+ return 1;
}
/*
* Init m4a file and write some tech data to given pointers.
*/
-static int aac_get_file_info(FILE *file, struct audio_format_info *afi)
+static int aac_get_file_info(char *map, size_t numbytes,
+ struct audio_format_info *afi)
{
- int i, ret, decoder_len;
- size_t inbuf_len, skip;
- unsigned long rate = 0;
- unsigned char channels = 0, *inbuf = para_malloc(AAC_INBUF_SIZE);
+ int i;
+ size_t skip;
+ ssize_t ret;
+ unsigned long rate = 0, decoder_len;
+ unsigned char channels = 0;
mp4AudioSpecificConfig mp4ASC;
NeAACDecHandle handle;
+ unsigned char *umap = (unsigned char *) map;
- infile = file;
- ret = read(fileno(infile), inbuf, AAC_INBUF_SIZE);
- if (ret <= 0) {
- ret = -E_AAC_READ;
- goto out;
- }
- inbuf_len = ret;
- ret = aac_find_esds(inbuf, inbuf_len, &skip);
+ ret = aac_find_esds(umap, numbytes, &skip, &decoder_len);
if (ret < 0)
goto out;
- decoder_len = ret;
handle = aac_open();
- ret = NeAACDecInit(handle, inbuf + skip, decoder_len, &rate, &channels);
- if (ret < 0) {
- ret = -E_AACDEC_INIT;
+ ret = -E_AAC_AFH_INIT;
+ if (NeAACDecInit(handle, umap + skip, decoder_len, &rate, &channels))
+ goto out;
+ if (!channels)
goto out;
- }
- skip += ret;
PARA_INFO_LOG("rate: %lu, channels: %d\n", rate, channels);
ret = -E_MP4ASC;
- if (NeAACDecAudioSpecificConfig(inbuf + skip, inbuf_len - skip,
- &mp4ASC) < 0)
+ if (NeAACDecAudioSpecificConfig(umap + skip, numbytes - skip, &mp4ASC))
goto out;
- ret = read_chunk_table(afi, inbuf, inbuf_len, skip);
+ if (!mp4ASC.samplingFrequency)
+ goto out;
+ ret = aac_compute_chunk_table(afi, umap, numbytes);
+ if (ret < 0)
+ goto out;
+ skip = ret;
+ ret = aac_set_chunk_tv(afi, &mp4ASC, &afi->seconds_total);
+ if (ret < 0)
+ goto out;
+ ret = aac_find_entry_point(umap + skip, numbytes - skip, &skip);
if (ret < 0)
goto out;
- afi->seconds_total = aac_set_chunk_tv(afi, &mp4ASC);
- for (;;) {
- ret = aac_find_entry_point(inbuf, inbuf_len, &skip);
- if (ret >= 0)
- break;
- ret = read(fileno(infile), inbuf, AAC_INBUF_SIZE);
- if (ret <= 0) {
- ret = -E_AAC_READ;
- goto out;
- }
- inbuf_len = ret;
- PARA_INFO_LOG("next buffer: %d bytes\n", ret);
- }
afi->chunk_table[0] = ret;
for (i = 1; i<= afi->chunks_total; i++)
afi->chunk_table[i] += ret;
- sprintf(afi->info_string, "audio_file_info1:%lu x %lums\n"
+ afi->channels = channels;
+ afi->frequency = rate;
+ ret = (afi->chunk_table[afi->chunks_total] - afi->chunk_table[0]) * 8; /* bits */
+ ret += (channels * afi->seconds_total * 500); /* avoid rounding error */
+ afi->bitrate = ret / (channels * afi->seconds_total * 1000);
+ sprintf(afi->info_string, "audio_file_info1:%lu x %lums, "
+ "%uHz, %d channel%s, %ukb/s\n"
"audio_file_info2:\n"
"audio_file_info3:\n",
- afi->chunks_total,
- tv2ms(&afi->chunk_tv));
+ afi->chunks_total, tv2ms(&afi->chunk_tv),
+ afi->frequency, channels, channels == 1? "" : "s", afi->bitrate
+ );
tv_scale(20, &afi->chunk_tv, &afi->eof_tv);
ret = 1;
out:
- free(inbuf);
return ret;
}
static const char* aac_suffixes[] = {"m4a", "mp4", NULL};
-/** the init function of the aac audio format handler */
-void aac_afh_init(struct audio_format_handler *p)
+/**
+ * the init function of the aac audio format handler
+ *
+ * \param afh pointer to the struct to initialize
+ */
+void aac_afh_init(struct audio_format_handler *afh)
{
- p->get_file_info = aac_get_file_info,
- p->close_audio_file = aac_close_audio_file;
- p->suffixes = aac_suffixes;
+ afh->get_file_info = aac_get_file_info,
+ afh->suffixes = aac_suffixes;
}
projects / paraslash.git / blobdiff