+/*
+ * Init m4a file and write some tech data to given pointers.
+ */
+static int aac_get_file_info(char *map, size_t numbytes, __a_unused int fd,
+ struct afh_info *afhi)
+{
+ int i;
+ size_t skip;
+ ssize_t ret;
+ unsigned long rate = 0, decoder_len;
+ unsigned char channels = 0;
+ mp4AudioSpecificConfig mp4ASC;
+ NeAACDecHandle handle = NULL;
+ unsigned char *umap = (unsigned char *) map;
+
+ ret = aac_find_esds(umap, numbytes, &skip, &decoder_len);
+ if (ret < 0)
+ goto out;
+ aac_get_taginfo(umap, numbytes, afhi);
+ handle = aac_open();
+ ret = -E_AAC_AFH_INIT;
+ if (NeAACDecInit(handle, umap + skip, decoder_len, &rate, &channels))
+ goto out;
+ if (!channels)
+ goto out;
+ PARA_DEBUG_LOG("rate: %lu, channels: %d\n", rate, channels);
+ ret = -E_MP4ASC;
+ if (NeAACDecAudioSpecificConfig(umap + skip, numbytes - skip, &mp4ASC))
+ goto out;
+ if (!mp4ASC.samplingFrequency)
+ goto out;
+ ret = aac_compute_chunk_table(afhi, umap, numbytes);
+ if (ret < 0)
+ goto out;
+ skip = ret;
+ ret = aac_set_chunk_tv(afhi, &mp4ASC, &afhi->seconds_total);
+ if (ret < 0)
+ goto out;
+ ret = aac_find_entry_point(umap + skip, numbytes - skip, &skip);
+ if (ret < 0)
+ goto out;
+ afhi->chunk_table[0] = ret;
+ for (i = 1; i<= afhi->chunks_total; i++)
+ afhi->chunk_table[i] += ret;
+ afhi->channels = channels;
+ afhi->frequency = rate;
+ ret = (afhi->chunk_table[afhi->chunks_total] - afhi->chunk_table[0]) * 8; /* bits */
+ ret += (channels * afhi->seconds_total * 500); /* avoid rounding error */
+ afhi->bitrate = ret / (channels * afhi->seconds_total * 1000);
+ ret = 1;
+out:
+ if (handle)
+ NeAACDecClose(handle);
+ return ret;
+}
+
+static const char* aac_suffixes[] = {"m4a", "mp4", NULL};
+/**
+ * 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)